1、开发一个APP，程序运行后的界面如下

设计一个APP，运行时显示第1个界面。点击“计算”按钮，显示第2个界面，并将第1数、第2个数的和显示在第2个界面中。点击“返回”按钮，返回到第1个界面

代码：

OneActivity.java

package top.yh.homework.one;import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;import top.yh.homework.R;
import top.yh.homework.util.StringUtil;
import top.yh.homework.util.ViewUtil;public class OneActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_one);final OneActivity that = this;EditText etOne = findViewById(R.id.et_one);EditText etTwo = findViewById(R.id.et_two);TextView tvRes = findViewById(R.id.tv_res);Button btnCal = findViewById(R.id.btn_cal);ActivityResultLauncher<Intent> register =registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),result -> {Intent intent = result.getData();if (intent == null || result.getResultCode() != RESULT_OK) {return;}tvRes.setText(intent.getStringExtra("result"));});btnCal.setOnClickListener(view -> {String one = etOne.getText().toString().trim();String two = etTwo.getText().toString().trim();if (StringUtil.isEmpty(one) || StringUtil.isEmpty(two)) {//为空ViewUtil.showToast(that, "请输入数据!");return;}register.launch(new Intent(that, ResultActivity.class).putExtra("one", one).putExtra("two", two));});}
}

activity_one.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:gravity="center_horizontal"android:orientation="vertical"tools:context=".one.OneActivity"><LinearLayoutandroid:layout_marginBottom="40dp"android:layout_width="350dp"android:layout_height="wrap_content"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/one_one_number"android:layout_marginEnd="50dp"android:textSize="25sp" /><EditTextandroid:id="@+id/et_one"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:inputType="number"android:background="@drawable/edit_text_selector"android:autofillHints="" /></LinearLayout><LinearLayoutandroid:layout_marginBottom="40dp"android:layout_width="350dp"android:layout_height="wrap_content"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/one_two_number"android:layout_marginEnd="50dp"android:textSize="25sp" /><EditTextandroid:id="@+id/et_two"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:inputType="number"android:background="@drawable/edit_text_selector"android:autofillHints="" /></LinearLayout><LinearLayoutandroid:layout_marginBottom="40dp"android:layout_width="350dp"android:layout_height="wrap_content"android:orientation="horizontal"><TextViewandroid:layout_width="120dp"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/one_result"android:gravity="center"android:layout_marginEnd="50dp"android:textSize="25sp" /><TextViewandroid:id="@+id/tv_res"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:background="@drawable/edit_text_selector"/></LinearLayout><Buttonandroid:id="@+id/btn_cal"android:layout_marginTop="20dp"android:layout_width="200dp"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/one_cal"android:textSize="25sp"/></LinearLayout>

ResultActivity.java

package top.yh.homework.one;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;import top.yh.homework.R;
import top.yh.homework.util.ViewUtil;public class ResultActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_result);final ResultActivity that = this;Intent intent = getIntent();if (intent == null) {ViewUtil.showToast(that,"没有接收到数据");return;}String one = intent.getStringExtra("one");String two = intent.getStringExtra("two");String res = (Integer.parseInt(one) + Integer.parseInt(two)) + "";TextView tvRes = findViewById(R.id.tv_res);tvRes.setText(res);findViewById(R.id.btn_back).setOnClickListener(view -> {//返回上一页面setResult(RESULT_OK,new Intent().putExtra("result",res));finish();});}
}

activity_result.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:gravity="center"android:orientation="vertical"tools:context=".one.ResultActivity"><LinearLayoutandroid:layout_width="350dp"android:layout_height="wrap_content"android:layout_marginBottom="40dp"android:orientation="horizontal"><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="50dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/one_result"android:textSize="25sp" /><TextViewandroid:id="@+id/tv_res"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:background="@drawable/edit_text_selector" /></LinearLayout><Buttonandroid:id="@+id/btn_back"android:layout_width="200dp"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:background="@drawable/translucent_text_view"android:text="@string/one_back"android:textSize="25sp" /></LinearLayout>

2、设计APP,运行时显示第1个界面，输入信息，点击“确定”，显示第2个界面，其中显示所输入的信息。点击返回，返回第1个界面。

要求：姓名、学号不能为空，如果为空，则在点击“确定”按钮时要有所提示。

代码：

TwoRegisterActivity.java


package top.yh.homework.two;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;import java.util.ArrayList;
import java.util.List;import top.yh.homework.R;
import top.yh.homework.util.StringUtil;
import top.yh.homework.util.ViewUtil;public class TwoRegisterActivity extends AppCompatActivity {List<String> hobbyList;String major;String hobby = "";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_two_register);final TwoRegisterActivity that = this;hobbyList = new ArrayList<>();String[] majorArray = getResources().getStringArray(R.array.majorArray);major = majorArray[0];EditText etName = findViewById(R.id.et_name);EditText etSno = findViewById(R.id.et_sno);Spinner spMajor = findViewById(R.id.sp_major);RadioGroup rgSex = findViewById(R.id.eg_sex);RadioButton rbMan = findViewById(R.id.rb_man);RadioButton rbWoman = findViewById(R.id.rb_woman);CheckBox cbBasketball = findViewById(R.id.cb_basketball);CheckBox cbBaseball = findViewById(R.id.cb_baseball);CheckBox cbBadminton = findViewById(R.id.cb_badminton);CheckBox cbFootball = findViewById(R.id.cb_football);RadioGroup rgPartyNumber = findViewById(R.id.rg_party_number);cbBasketball.setOnCheckedChangeListener(new CheckBoxChangeListener(cbBasketball));cbBaseball.setOnCheckedChangeListener(new CheckBoxChangeListener(cbBaseball));cbBadminton.setOnCheckedChangeListener(new CheckBoxChangeListener(cbBadminton));cbFootball.setOnCheckedChangeListener(new CheckBoxChangeListener(cbFootball));spMajor.setSelection(0);spMajor.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {major = majorArray[i];}@Overridepublic void onNothingSelected(AdapterView<?> adapterView) {}});Button btnConfirm = findViewById(R.id.btn_confirm);btnConfirm.setOnClickListener(view -> {String name = etName.getText().toString().trim();String sno = etSno.getText().toString().trim();if (StringUtil.isEmpty(sno) || StringUtil.isEmpty(name) || hobbyList.size() == 0) {ViewUtil.showToast(that, "请将信息填写完整");return;}String sex = rgSex.getCheckedRadioButtonId() == rbMan.getId() ? "男" : "女";String isPartyNumber = rgPartyNumber.getCheckedRadioButtonId() == R.id.rb_yes ? "是" : "否";hobbyList.forEach(ho -> hobby += ho + "/");startActivity(new Intent(that, TwoResultActivity.class).putExtra("name", name).putExtra("sno", sno).putExtra("sex", sex).putExtra("isPartyNumber", isPartyNumber).putExtra("major", major).putExtra("hobby", hobby));});}private class CheckBoxChangeListener implements CompoundButton.OnCheckedChangeListener {CheckBox box;public CheckBoxChangeListener(CheckBox box) {this.box = box;}@Overridepublic void onCheckedChanged(CompoundButton compoundButton, boolean b) {String s = box.getText().toString();if (b) {hobbyList.add(s);} else {hobbyList.remove(s);}}}
}

activity_two_register.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="center"android:gravity="center"android:orientation="vertical"tools:context=".two.TwoRegisterActivity"><TextViewandroid:layout_width="350dp"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_register_title"android:textSize="@dimen/tvTextSize" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:layout_marginEnd="10dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_name"android:textSize="@dimen/tvTextSize" /><EditTextandroid:id="@+id/et_name"android:layout_width="200dp"android:layout_height="match_parent"android:autofillHints=""android:background="@drawable/edit_text_selector"android:inputType="text"tools:ignore="LabelFor" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:layout_marginEnd="10dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_sno"android:textSize="@dimen/tvTextSize" /><EditTextandroid:id="@+id/et_sno"android:layout_width="200dp"android:layout_height="match_parent"android:autofillHints=""android:background="@drawable/edit_text_selector"android:inputType="number"tools:ignore="LabelFor" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:layout_marginEnd="10dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_major"android:textSize="@dimen/tvTextSize" /><Spinnerandroid:id="@+id/sp_major"android:layout_width="200dp"android:layout_height="match_parent"android:background="@drawable/edit_text_selector"android:entries="@array/majorArray"android:spinnerMode="dialog" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:layout_marginStart="10dp"android:layout_marginEnd="10dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_sex"android:textSize="@dimen/tvTextSize" /><RadioGroupandroid:id="@+id/eg_sex"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:orientation="horizontal"><RadioButtonandroid:id="@+id/rb_man"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginEnd="50dp"android:checked="true"android:text="@string/two_sex_man"android:textSize="@dimen/tvTextSize" /><RadioButtonandroid:id="@+id/rb_woman"android:layout_width="wrap_content"android:layout_height="match_parent"android:text="@string/two_sex_woman"android:textSize="@dimen/tvTextSize" /></RadioGroup></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="80dp"android:layout_height="wrap_content"android:layout_marginEnd="10dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_interests"android:textSize="@dimen/tvTextSize" /><CheckBoxandroid:id="@+id/cb_basketball"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/two_hobby_basketball"android:textSize="@dimen/tvTextSize" /><CheckBoxandroid:id="@+id/cb_football"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/two_hobby_football"android:textSize="@dimen/tvTextSize" /><CheckBoxandroid:id="@+id/cb_baseball"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/two_hobby_baseball"android:textSize="@dimen/tvTextSize" /><CheckBoxandroid:id="@+id/cb_badminton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/two_hobby_badminton"android:textSize="@dimen/tvTextSize" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_is_party_member"android:textSize="@dimen/tvTextSize" /><RadioGroupandroid:id="@+id/rg_party_number"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:orientation="horizontal"><RadioButtonandroid:id="@+id/rb_yes"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginEnd="50dp"android:checked="true"android:text="@string/two_yes"android:textSize="@dimen/tvTextSize" /><RadioButtonandroid:id="@+id/rb_no"android:layout_width="wrap_content"android:layout_height="match_parent"android:text="@string/two_no"android:textSize="@dimen/tvTextSize" /></RadioGroup></LinearLayout><Buttonandroid:id="@+id/btn_confirm"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/two_confirm"android:textSize="@dimen/tvTextSize" />
</LinearLayout>

TwoResultActivity.java

package top.yh.homework.two;import androidx.appcompat.app.AppCompatActivity;import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;import top.yh.homework.R;
import top.yh.homework.util.ViewUtil;public class TwoResultActivity extends AppCompatActivity {@SuppressLint("SetTextI18n")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Intent intent = getIntent();setContentView(R.layout.activity_two_result);findViewById(R.id.btn_back).setOnClickListener(view -> finish());TextView tvName = findViewById(R.id.tv_name);TextView tvSno = findViewById(R.id.tv_sno);TextView tvHobby = findViewById(R.id.tv_hobby);TextView tvMajor = findViewById(R.id.tv_major);TextView tvSex = findViewById(R.id.tv_sex);TextView tvPartyMember = findViewById(R.id.tv_party_member);try {tvName.setText(getString(R.string.two_name)  + ":" + intent.getStringExtra("name"));tvSno.setText(getString(R.string.two_sno) +":" +intent.getStringExtra("sno"));tvHobby.setText(getString(R.string.two_interests) + ":" + intent.getStringExtra("hobby"));tvMajor.setText(getString(R.string.two_major) + ":" + intent.getStringExtra("major"));tvSex.setText(getString(R.string.two_sex) + ":"  + intent.getStringExtra("sex"));tvPartyMember.setText(getString(R.string.two_party_member) + ":" + intent.getStringExtra("isPartyNumber"));}catch (Exception e){e.printStackTrace();ViewUtil.showToast(this,"数据传输失败");}}
}

activity_two_result.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="center"android:gravity="center"android:orientation="vertical"tools:context=".two.TwoResultActivity"><TextViewandroid:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="20dp"android:background="@drawable/translucent_text_view"android:gravity="center"android:text="@string/two_result_title"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_name"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_sno"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_major"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_sex"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_hobby"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><TextViewandroid:id="@+id/tv_party_member"android:layout_width="250dp"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:background="@drawable/translucent_text_view"android:textSize="@dimen/tvTextSize" /><Buttonandroid:id="@+id/btn_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/two_back"android:textSize="@dimen/tvTextSize" />
</LinearLayout>

3. 设计一个APP，使用listview显示20种水果的名称和对应图片，点击一个水果，显示该水果的介绍。

代码：

ThreeMainActivity.java

package top.yh.homework.three;import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;import java.util.List;
import java.util.Map;import top.yh.homework.R;
import top.yh.homework.three.adapter.ThreeAdapter;
import top.yh.homework.three.entity.Fruit;public class ThreeMainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_three_main);ListView lvList = findViewById(R.id.lv_list);List<Fruit> list = Fruit.getDefaultList();final ThreeMainActivity that = this;Map<String, String> descMap = Fruit.getDescMap();ThreeAdapter adapter = new ThreeAdapter(this, list);lvList.setAdapter(adapter);lvList.setOnItemClickListener((adapterView, view, i, l) -> {new AlertDialog.Builder(that).setTitle(list.get(i).name).setMessage(descMap.get(list.get(i).name)).setPositiveButton("确定", (dialog, id) -> {}).setNegativeButton("取消", (dialog, id) -> {}).create().show();});}
}

activity_three_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"tools:context=".three.ThreeMainActivity"><ListViewandroid:id="@+id/lv_list"android:layout_width="match_parent"android:layout_height="wrap_content"/>
</LinearLayout>

Fruit.java

package top.yh.homework.three.entity;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import top.yh.homework.R;/*** @user* @date*/
public class Fruit {public int img;public String name;public Fruit(int img, String name) {this.img = img;this.name = name;}private static final Integer[] iconArray = {R.drawable.apple, R.drawable.banana, R.drawable.lemon,R.drawable.mangosteen, R.drawable.watermelon};private final static String[] startArray = {"苹果", "香蕉", "柠檬","山竹", "西瓜"};private final static String[] descArray = {"苹果（Malus pumila Mill.），蔷薇科苹果属落叶乔木植物，茎干较高，小枝短而粗，呈圆柱形；叶片椭圆形，表面光滑，边缘有锯齿，叶柄粗壮；花朵较小呈伞状，淡粉色，表面有绒毛；果实较大，呈扁球形，果梗短粗；花期5月；果期7~10月。苹果名称最早是见于明代王世懋的《学圃余疏》“北土之苹婆果，即花红一种之变也。","香蕉（Musa nana Lour.），芭蕉科芭蕉属多年生草本植物，植株丛生，有匐匍茎；假茎浓绿有黑色斑点；叶片长圆形，上面为深绿色，无白粉，下面浅绿色；花朵为乳白色或淡紫色；果实呈弯曲的弓状，有棱，果皮为青绿色，成熟后变黄；果肉松软，黄白色，味甜香味浓，无种子","柠檬（Citrus × limon (Linnaeus) Osbeck），芸香科柑橘属木本植物，枝少刺或近于无刺，嫩叶及花芽暗紫红色；叶为卵形或椭圆形；花瓣外面为淡紫红色，内面白色；果实为椭圆形或卵形，果皮厚，柠檬黄色；花期4~5月；果期9~11月。","山竹（拉丁学名：Garcinia mangostana L.）是藤黄科藤黄属植物，原产于马鲁古，亚洲和非洲热带地区广泛栽培，喜欢有机物丰富、pH值在5~6.5的砂壤。","西瓜（Citrullus lanatus (Thunb.) Matsum. & Nakai），是葫芦科西瓜属一年生蔓生藤本植物，形态一般近似于球形或椭圆形，颜色有深绿、浅绿或带有黑绿条带或斑纹；瓜籽多为黑色，呈椭圆形，头尖；茎枝粗壮，有淡黄褐色的柔毛；叶片如纸，呈三角状卵形，边缘呈波状。花果期5—6月。 因9世纪自西域传入中国，故名西瓜。",};public static List<Fruit> getDefaultList() {List<Fruit> list = new ArrayList<>();for (int i = 0; i < iconArray.length; i++) {list.add(new Fruit(iconArray[i], startArray[i]));}return list;}public static Map<String, String> getDescMap() {Map<String, String> map = new HashMap<>(descArray.length);for (int i = 0; i < descArray.length; i++) {map.put(startArray[i], descArray[i]);}return map;}
}

ThreeAdapter.java

package top.yh.homework.three.adapter;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;import java.util.List;import top.yh.homework.R;
import top.yh.homework.three.entity.Fruit;/*** @user* @date*/
public class ThreeAdapter extends BaseAdapter {private Context context;private List<Fruit> list;public ThreeAdapter(Context context, List<Fruit> list) {this.context = context;this.list = list;}@Overridepublic int getCount() {//获取列表项的个数return list.size();}@Overridepublic Object getItem(int i) {return list.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {ViewHolder viewHolder;if (view == null) {//根据布局文件生成转换视图对象view = LayoutInflater.from(context).inflate(R.layout.item_fruit, null);viewHolder = new ViewHolder(view.findViewById(R.id.iv_icon),view.findViewById(R.id.tv_name));//将视图持有者保存到转换视图中view.setTag(viewHolder);}else {viewHolder = (ViewHolder) view.getTag();}//给控件设置好数据Fruit item = list.get(i);viewHolder.ivIcon.setImageResource(item.img);viewHolder.tvName.setText(item.name);return view;}public static final class ViewHolder{public ImageView ivIcon;public TextView tvName;public ViewHolder(ImageView ivIcon, TextView tvName) {this.ivIcon = ivIcon;this.tvName = tvName;}}
}

item_fruit.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:orientation="horizontal"android:layout_height="50dp"><ImageViewandroid:id="@+id/iv_icon"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:src="@drawable/banana"android:scaleType="fitCenter"/><TextViewandroid:id="@+id/tv_name"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="3"android:gravity="center"android:textSize="@dimen/tvTextSize"android:textColor="@color/purple_700"android:text="水果"/></LinearLayout>

4、在sd卡中存入一个文件，保存若干个整数，每个整数用空格分隔，当app运行时，从该文件中读取数据，并计算显示其和

<!--存储权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
<application...android:requestLegacyExternalStorage="true"android:usesCleartextTraffic="true"
...>

代码：

FourMainActivity.java

package top.yh.homework.four;import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.util.Log;
import android.view.View;
import android.widget.TextView;import top.yh.homework.R;
import top.yh.homework.util.FileUtil;
import top.yh.homework.util.ViewUtil;public class FourMainActivity extends AppCompatActivity {private String FILE_SAVE_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/MobileReport/";private String FILE_NAME = "user.txt";private static final int REQUEST_EXTERNAL_STORAGE = 1;private static String[] PERMISSIONS_STORAGE = {Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE};private boolean havePermission = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_four_main);checkPermission();//写文件String context = "1 2 3 4 5 6 7 8 9 10";FileUtil.writeToSd(FILE_SAVE_PATH, FILE_NAME, context);TextView tvRes = findViewById(R.id.tv_res);findViewById(R.id.btn_display).setOnClickListener(view -> {//读文件String res = FileUtil.readToSd(FILE_SAVE_PATH, FILE_NAME);String[] s = res.split(" ");int sum = 0;for (String s1 : s) {sum += Integer.parseInt(s1);}tvRes.setText(String.valueOf(sum));tvRes.setVisibility(View.VISIBLE);});}@Overrideprotected void onResume() {super.onResume();checkPermission();}@Overridepublic void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);if (requestCode == REQUEST_EXTERNAL_STORAGE) {if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {havePermission = true;ViewUtil.showToast(this, "授权成功！");} else {havePermission = false;ViewUtil.showToast(this, "授权被拒绝！");}}}private AlertDialog dialog;private void checkPermission() {//检查权限（NEED_PERMISSION）是否被授权 PackageManager.PERMISSION_GRANTED表示同意授权if (Build.VERSION.SDK_INT >= 30) {if (!Environment.isExternalStorageManager()) {if (dialog != null) {dialog.dismiss();dialog = null;}dialog = new AlertDialog.Builder(this).setTitle("提示").setMessage("请开启文件访问权限，否则无法正常使用本应用！").setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int i) {dialog.dismiss();}}).setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();Intent intent = new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);startActivity(intent);}}).create();dialog.show();} else {havePermission = true;Log.i("swyLog", "Android 11以上，当前已有权限");}} else {if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {//申请权限if (dialog != null) {dialog.dismiss();dialog = null;}dialog = new AlertDialog.Builder(this).setTitle("提示").setMessage("请开启文件访问权限，否则无法正常使用本应用！").setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();ActivityCompat.requestPermissions(FourMainActivity.this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);}}).create();dialog.show();} else {havePermission = true;Log.i("swyLog", "Android 6.0以上，11以下，当前已有权限");}} else {havePermission = true;Log.i("swyLog", "Android 6.0以下，已获取权限");}}}
}

activity_four_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:layout_gravity="center"android:gravity="center"tools:context=".four.FourMainActivity"><Buttonandroid:id="@+id/btn_display"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/four_display"android:layout_marginBottom="20dp"android:textSize="@dimen/tvTextSize"android:background="@drawable/translucent_text_view"/><TextViewandroid:id="@+id/tv_res"android:layout_width="120dp"android:layout_height="wrap_content"android:textSize="@dimen/tvTextSize"android:background="@drawable/translucent_text_view"android:visibility="gone"/>
</LinearLayout>

FileUtil.java

public static String readToSd(String path, String name) {InputStream inputStream = null;Reader reader = null;BufferedReader bufferedReader = null;try {File storage = new File(path);if (!storage.exists()) {return "";}File file = new File(storage, name);if (!file.exists()) {return "";}inputStream = Files.newInputStream(file.toPath());reader = new InputStreamReader(inputStream);bufferedReader = new BufferedReader(reader);StringBuilder result = new StringBuilder();String temp;while ((temp = bufferedReader.readLine()) != null) {result.append(temp);}String value = decodeToString(result.toString());Log.i("swyLog", "upload 密文：" + result);Log.i("swyLog", "upload 明文：" + value);return value;} catch (Exception e) {e.printStackTrace();} finally {if (reader != null) {try {reader.close();} catch (IOException e) {e.printStackTrace();}}if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}if (bufferedReader != null) {try {bufferedReader.close();} catch (IOException e) {e.printStackTrace();}}}return "";}/*** 写入文件方法** @param content*/public static void writeToSd(String path, String mode, String content) {if (StringUtil.isEmpty(content)) {return;}Log.i("swyLog", "saveLoginAccount called");String value = encodeToString(content);Log.i("swyLog", "save 明文：" + content);Log.i("swyLog", "save 密文：" + value);File storage = new File(path);if (!storage.exists()) {storage.mkdirs();}File tmepfile = new File(storage.getPath());if (!tmepfile.exists()) {tmepfile.mkdirs();}File file = new File(tmepfile, mode);if (file.exists()) {Log.i("swyLog", "删除原有文件");file.delete();}if (!file.exists()) {Log.i("swyLog", "文件删除成功");try {file.createNewFile();} catch (IOException e) {e.printStackTrace();}}FileOutputStream fileOutputStream = null;try {fileOutputStream = new FileOutputStream(file);fileOutputStream.write(value.getBytes());} catch (Exception e) {e.printStackTrace();} finally {if (fileOutputStream != null) {try {fileOutputStream.close();} catch (IOException e) {e.printStackTrace();}}}}

5、设计一个app，界面如下，有两个按钮，当点击打卡按钮，则在app中增加一个当前时间的打卡记录，点击显示记录按钮，显示所有的打卡记录

代码：

FiveMainActivity.java

package top.yh.homework.five;import androidx.appcompat.app.AppCompatActivity;import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ListView;import java.util.ArrayList;
import java.util.List;import top.yh.homework.R;
import top.yh.homework.five.adapter.ListAdapter;
import top.yh.homework.five.entity.CardInfo;
import top.yh.homework.five.helper.SqliteHelper;
import top.yh.homework.util.TimeUtil;
import top.yh.homework.util.ViewUtil;public class FiveMainActivity extends AppCompatActivity {private SqliteHelper helper;private List<CardInfo> list;private ListAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_five_main);final FiveMainActivity that = this;Button btnClock = findViewById(R.id.btn_clock_in);Button btnDisPlay = findViewById(R.id.btn_display);ListView lvList = findViewById(R.id.lv_list);list = new ArrayList<>();adapter = new ListAdapter(this, list);lvList.setAdapter(adapter);btnClock.setOnClickListener(view -> {String time = TimeUtil.getTimeToYearMonthDayHourMinuteSecond();if (helper.save(time) > 0L) {ViewUtil.showToast(that,"打卡成功");}});btnDisPlay.setOnClickListener(view -> {list.clear();list.addAll(helper.queryAll());adapter.notifyDataSetChanged();});}@Overrideprotected void onStart() {super.onStart();helper = SqliteHelper.getInstance(this);helper.openReadLink();helper.openWriteLink();}@Overrideprotected void onStop() {super.onStop();helper.closeLink();}
}

activity_five_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".five.FiveMainActivity"><LinearLayoutandroid:layout_gravity="center"android:gravity="center"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><Buttonandroid:id="@+id/btn_clock_in"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/five_clock_in"android:textSize="@dimen/tvTextSize" /><Buttonandroid:id="@+id/btn_display"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="20sp"android:background="@drawable/translucent_text_view"android:text="@string/five_display_records"android:textSize="@dimen/tvTextSize" /></LinearLayout><ListViewandroid:id="@+id/lv_list"android:layout_width="wrap_content"android:layout_height="wrap_content" />
</LinearLayout>

ListAdapter.java

package top.yh.homework.five.adapter;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;import java.util.List;import top.yh.homework.R;
import top.yh.homework.five.entity.CardInfo;/*** @user* @date*/
public class ListAdapter extends BaseAdapter {private Context context;private List<CardInfo> list;public ListAdapter(Context context, List<CardInfo> list) {this.context = context;this.list = list;}@Overridepublic int getCount() {//获取列表项的个数return list.size();}@Overridepublic Object getItem(int i) {return list.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {ViewHolder viewHolder;if (view == null) {//根据布局文件生成转换视图对象view = LayoutInflater.from(context).inflate(R.layout.item_five_list, null);viewHolder = new ViewHolder(view.findViewById(R.id.tv_time));//将视图持有者保存到转换视图中view.setTag(viewHolder);}else {viewHolder = (ViewHolder) view.getTag();}//给控件设置好数据CardInfo item = list.get(i);viewHolder.tvTime.setText(item.timer);return view;}public static final class ViewHolder{public TextView tvTime;public ViewHolder( TextView tvTime) {this.tvTime = tvTime;}}
}

item_five_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:orientation="horizontal"android:layout_height="50dp"><TextViewandroid:id="@+id/tv_time"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="3"android:gravity="center"android:textSize="@dimen/tvTextSize"android:textColor="@color/purple_700"android:text="水果"/></LinearLayout>

CardInfo.java

package top.yh.homework.five.entity;/*** @user* @date*/
public class CardInfo {public int id;public String timer;public CardInfo() {}public CardInfo(int id, String timer) {this.id = id;this.timer = timer;}
}

SqliteHelper.java

package top.yh.homework.five.helper;import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;import androidx.annotation.Nullable;import java.util.ArrayList;
import java.util.List;import top.yh.homework.five.entity.CardInfo;/*** @user* @date*/
public class SqliteHelper extends SQLiteOpenHelper {private static final String DB_NAME = "card.db";private static final String TABLE_NAME = "card_info";private static final int DB_VERSION = 1;private static SqliteHelper helper;/*** 读实例*/private SQLiteDatabase rsd = null;/*** 写实例*/private SQLiteDatabase wsd = null;private SqliteHelper(@Nullable Context context) {super(context, DB_NAME, null, DB_VERSION);}public static SqliteHelper getInstance(Context context) {if (helper == null) {helper = new SqliteHelper(context);}return helper;}/*** 打开数据库的读连接** @return*/public SQLiteDatabase openReadLink() {if (rsd == null || !rsd.isOpen()) {rsd = helper.getReadableDatabase();}return rsd;}/*** 打开数据库的写连接** @return*/public SQLiteDatabase openWriteLink() {if (wsd == null || !wsd.isOpen()) {wsd = helper.getWritableDatabase();}return wsd;}public void closeLink() {if (rsd != null && rsd.isOpen()) {rsd.close();rsd = null;}if (wsd != null && wsd.isOpen()) {wsd.close();wsd = null;}}@Overridepublic void onCreate(SQLiteDatabase sqLiteDatabase) {String sql = "create table if not exists " + TABLE_NAME +"(_id integer primary key autoincrement not null," +"timer text not null);";sqLiteDatabase.execSQL(sql);}@Overridepublic void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {}public long save(String timer) {ContentValues values = new ContentValues();values.put("timer", timer);return wsd.insert(TABLE_NAME, null, values);}@SuppressLint("Range")public List<CardInfo> queryAll() {List<CardInfo> list = new ArrayList<>();Cursor cursor = rsd.rawQuery("select * from " + TABLE_NAME, null);while (cursor.moveToNext()){list.add(new CardInfo(cursor.getInt(cursor.getColumnIndex("_id")),cursor.getString(cursor.getColumnIndex("timer"))));}cursor.close();return list;}
}

6. 设计一个APP，具有两个线程，一个线程计算1+2…+n的和,一个线程计算1*2*3*….n的乘积（n的值从键盘输入），并显示结果

代码：

SixMainActivity.java

package top.yh.homework.six;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;import top.yh.homework.R;
import top.yh.homework.util.StringUtil;
import top.yh.homework.util.ViewUtil;public class SixMainActivity extends AppCompatActivity {private StringBuilder builder;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_six_main);final SixMainActivity that = this;builder = new StringBuilder();EditText etNum = findViewById(R.id.et_num);Button btnCal = findViewById(R.id.btn_cal);TextView tvRes = findViewById(R.id.tv_res);btnCal.setOnClickListener(view -> {String num = etNum.getText().toString().trim();if (StringUtil.isEmpty(num)) {ViewUtil.showToast(that,"请输入数字");return;}int n = Integer.parseInt(num);that.runOnUiThread(() -> {builder.append("和为：").append(n * (n + 1) / 2);tvRes.setText(builder);tvRes.setVisibility(View.VISIBLE);});that.runOnUiThread(()-> {int sum = 1;for (int i = 1; i <= n; i++) {sum *= i;}builder.append("    乘积为：").append(sum);tvRes.setText(builder);tvRes.setVisibility(View.VISIBLE);});});}
}

activity_six_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:orientation="vertical"android:layout_gravity="center"android:gravity="center"android:layout_height="match_parent"tools:context=".six.SixMainActivity"><LinearLayoutandroid:layout_width="350dp"android:layout_height="wrap_content"android:layout_gravity="center"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="150dp"android:layout_height="match_parent"android:gravity="center"android:layout_marginEnd="20dp"android:text="@string/six_input_number"android:textSize="@dimen/tvTextSize"android:background="@drawable/translucent_text_view"/><EditTextandroid:id="@+id/et_num"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:background="@drawable/edit_text_selector"android:inputType="number"/></LinearLayout><Buttonandroid:id="@+id/btn_cal"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/one_cal"android:textSize="@dimen/tvTextSize"android:layout_marginTop="20dp"android:background="@drawable/translucent_text_view"/><TextViewandroid:id="@+id/tv_res"android:layout_width="250dp"android:layout_marginTop="50dp"android:layout_height="wrap_content"android:textSize="@dimen/tvTextSize"android:background="@drawable/translucent_text_view"android:visibility="gone"/>
</LinearLayout>

7. 设计一个app，可以绘制矩形、圆、直线，其中绘制坐标可以输入

代码：

SevenMainActivity.java

package top.yh.homework.seven;import androidx.appcompat.app.AppCompatActivity;import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;import top.yh.homework.R;
import top.yh.homework.util.StringUtil;
import top.yh.homework.util.ViewUtil;public class SevenMainActivity extends AppCompatActivity {private EditText etX;private EditText etY;private int x;private int y;private final int LINE = 50;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_seven_main);Button btnLine = findViewById(R.id.btn_line);Button btnRectangle = findViewById(R.id.btn_rectangle);Button btnCircle = findViewById(R.id.btn_circle);ImageView ivIcon = findViewById(R.id.iv_icon);etX = findViewById(R.id.et_x);etY = findViewById(R.id.et_y);// 创建空白的bitmapBitmap bitmap = Bitmap.createBitmap(400, 400, Bitmap.Config.ARGB_8888);// 新建画布,关联bitmapCanvas canvas = new Canvas(bitmap);// 绘制背景canvas.drawColor(Color.WHITE);//创建蓝画笔Paint bluePaint = new Paint();bluePaint.setStyle(Paint.Style.STROKE);bluePaint.setColor(Color.BLUE);//画笔粗细为9像素点bluePaint.setStrokeWidth(9);btnLine.setOnClickListener(view -> {if (check()) {canvas.drawColor(0,PorterDuff.Mode.CLEAR);//划线canvas.drawLine(x, y, x + LINE, y, bluePaint);//显示bitmap到ImageView中ivIcon.setImageBitmap(bitmap);}});btnCircle.setOnClickListener(view -> {if (check()) {canvas.drawColor(0,PorterDuff.Mode.CLEAR);canvas.drawCircle(x,y,LINE,bluePaint);ivIcon.setImageBitmap(bitmap);}});btnRectangle.setOnClickListener(view -> {if (check()) {canvas.drawColor(0,PorterDuff.Mode.CLEAR);Rect rect = new Rect();rect.top = y;rect.bottom = y + LINE;rect.left = x;rect.right = x + LINE;canvas.drawRect(rect, bluePaint);ivIcon.setImageBitmap(bitmap);}});}private boolean check(){String x = etX.getText().toString().trim();String y = etY.getText().toString().trim();if (StringUtil.isEmpty(x) || StringUtil.isEmpty(y)) {ViewUtil.showToast(this,"请输入坐标");return false;}this.x = Integer.parseInt(x);this.y = Integer.parseInt(y);return true;}}

activity_seven_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".seven.SevenMainActivity"><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:gravity="center"android:orientation="horizontal"><Buttonandroid:id="@+id/btn_circle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/seven_draw_a_circle"android:textSize="@dimen/tvTextSize" /><Buttonandroid:id="@+id/btn_line"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/seven_draw_a_straight_line"android:textSize="@dimen/tvTextSize" /><Buttonandroid:id="@+id/btn_rectangle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/translucent_text_view"android:text="@string/seven_draw_rectangle"android:textSize="@dimen/tvTextSize" /></LinearLayout><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_marginTop="20dp"android:gravity="center"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="20dp"android:text="@string/seven_please_enter_coordinates"android:textSize="@dimen/tvTextSize" /><EditTextandroid:id="@+id/et_x"android:layout_width="70dp"android:layout_height="match_parent"android:background="@drawable/edit_text_selector"android:gravity="center"android:hint="@string/seven_x"android:inputType="number"android:textSize="@dimen/tvTextSize" /><EditTextandroid:id="@+id/et_y"android:layout_width="70dp"android:layout_height="match_parent"android:layout_marginStart="20dp"android:background="@drawable/edit_text_selector"android:gravity="center"android:hint="@string/seven_y"android:inputType="number"android:textSize="@dimen/tvTextSize" /></LinearLayout><ImageViewandroid:id="@+id/iv_icon"android:layout_width="match_parent"android:layout_height="match_parent"/>
</LinearLayout>

通用文件

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"><!-- 存储权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /><applicationandroid:allowBackup="true"android:dataExtractionRules="@xml/data_extraction_rules"android:fullBackupContent="@xml/backup_rules"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:requestLegacyExternalStorage="true"android:supportsRtl="true"android:theme="@style/Theme.HomeWork"android:usesCleartextTraffic="true"tools:targetApi="31"><activityandroid:name=".seven.SevenMainActivity"android:exported="false" /><activityandroid:name=".six.SixMainActivity"android:exported="false" /><activityandroid:name=".five.FiveMainActivity"android:exported="false" /><activityandroid:name=".four.FourMainActivity"android:exported="true" /><activityandroid:name=".three.ThreeMainActivity"android:exported="false" /><activityandroid:name=".two.TwoResultActivity"android:exported="false" /><activityandroid:name=".two.TwoRegisterActivity"android:exported="false" /><activityandroid:name=".one.ResultActivity"android:exported="false" /><activityandroid:name=".one.OneActivity"android:exported="false" /><activityandroid:name=".MainActivity"android:exported="true"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources><color name="purple_200">#FFBB86FC</color><color name="purple_500">#FF6200EE</color><color name="purple_700">#FF3700B3</color><color name="teal_200">#FF03DAC5</color><color name="teal_700">#FF018786</color><color name="black">#FF000000</color><color name="white">#FFFFFFFF</color><color name="transparent">#00000000</color>
</resources>

spinner_item.xml

<?xml version="1.0" encoding="utf-8"?>
<resources><string-array name="majorArray"><item>计算机</item><item>软件</item><item>财务</item><item>电信</item><item>电气</item></string-array>
</resources>

strings.xml

<resources><string name="app_name">HomeWork</string><string name="one">第一个作业</string><string name="one_one_number">第一个数</string><string name="one_two_number">第一个数</string><string name="one_result">结果</string><string name="one_cal">计算</string><string name="one_back">返回</string><string name="two">第二个作业</string><string name="two_register_title">注册信息</string><string name="two_name">姓名</string><string name="two_sno">学号</string><string name="two_major">专业</string><string name="two_sex">性别</string><string name="two_sex_man">男</string><string name="two_sex_woman">女</string><string name="two_interests">爱好</string><string name="two_party_member">党员</string><string name="two_is_party_member">是否党员</string><string name="two_yes">是</string><string name="two_no">否</string><string name="two_confirm">确定</string><string name="two_back">返回</string><string name="two_hobby_basketball">篮球</string><string name="two_hobby_football">足球</string><string name="two_hobby_baseball">棒球</string><string name="two_hobby_badminton">羽毛球</string><string name="two_result_title">你提交的信息</string><string name="three">第三个作业</string><string name="four">第四个作业</string><string name="four_display">显示其和</string><string name="five">第五个作业</string><string name="five_clock_in">打卡</string><string name="five_display_records">显示记录</string><string name="six">第六个作业</string><string name="six_input_number">请输入整数</string><string name="seven">第七个作业</string><string name="seven_draw_rectangle">绘制矩形</string><string name="seven_draw_a_circle">绘制圆形</string><string name="seven_draw_a_straight_line">绘制直线</string><string name="seven_please_enter_coordinates">输入坐标</string><string name="seven_x">x</string><string name="seven_y">y</string>
</resources>

translucent_text_view.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"><solid android:color="@color/transparent" /><stroke android:width="3dip" android:color="@color/black" /><corners android:radius="10dp"/><padding android:bottom="10dp"android:left="10dp"android:right="10dp"android:top="10dp"/>
</shape>

shape_edit_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<!--指定形状内部的填充颜色--><solid android:color="#ffffff"/>
<!--    指定形状轮廓的粗细与颜色--><stroke android:width="1dp" android:color="#aaaaaa"/>
<!--    指定形状四个圆角的半径--><corners android:radius="5dp"/>
<!--    指定形状四个方向的间距--><padding android:bottom="2dp" android:left="2dp" android:right="2dp" android:top="2dp"/></shape>

shape_edit_focus.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<!--指定形状内部的填充颜色--><solid android:color="#ffffff"/>
<!--    指定形状轮廓的粗细与颜色--><stroke android:width="1dp" android:color="#0000ff"/>
<!--    指定形状四个圆角的半径--><corners android:radius="5dp"/>
<!--    指定形状四个方向的间距--><padding android:bottom="2dp" android:left="2dp" android:right="2dp" android:top="2dp"/></shape>

edit_text_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:drawable="@drawable/shape_edit_focus" android:state_focused="true" /><item android:drawable="@drawable/shape_edit_normal"/></selector>

源代码：GitXiaoHao/Android家庭作业 (github.com)

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汽院移动终端软件开发作业

1、开发一个APP，程序运行后的界面如下

2、设计APP,运行时显示第1个界面，输入信息，点击“确定”，显示第2个界面，其中显示所输入的信息。点击返回，返回第1个界面。

4、在sd卡中存入一个文件，保存若干个整数，每个整数用空格分隔，当app运行时，从该文件中读取数据，并计算显示其和

5、设计一个app，界面如下，有两个按钮，当点击打卡按钮，则在app中增加一个当前时间的打卡记录，点击显示记录按钮，显示所有的打卡记录

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