1、目录

2、代码

2.1 java

ListActivity.java

public class ListActivity extends Activity {private SQLiteDatabase db;private ListView list;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_list);db = openOrCreateDatabase("examDB", MODE_PRIVATE, null);list = findViewById(R.id.list);showList();}private void showList(){String [] from = {"goods", "money", "remark"};int [] to = {R.id.text_goods, R.id.text_money, R.id.text_remark};Cursor c = db.rawQuery("select * from account", null);if (c != null) {String[] goods = new String[c.getCount()];double[] money = new double[c.getCount()];String[] remark = new String[c.getCount()];int[] id = new int[c.getCount()];int len = 0;ArrayList<HashMap<String, Object>> data = new ArrayList<>();while(c.moveToNext()) {id[len] = c.getInt(0);goods[len] = c.getString(1);money[len] = c.getDouble(2);remark[len] = c.getString(3);++len;}for(int i = 0; i < len; ++i) {HashMap<String, Object> m = new HashMap<String, Object>();m.put("id", id[i]);m.put(from[0], goods[i]);m.put(from[1], money[i]);m.put(from[2], remark[i]);data.add(m);}SimpleAdapter adapter = new MyAdapter(this, data, R.layout.item, from, to);list.setAdapter(adapter);}}
}

LoginActivity.java

public class LoginActivity extends Activity implements View.OnClickListener{private EditText edt_uname;private EditText edt_upass;private Button btn_login;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login);register();}private void register(){edt_uname = findViewById(R.id.edt_uname);edt_upass = findViewById(R.id.edt_upass);btn_login = findViewById(R.id.btn_login);btn_login.setOnClickListener(this);}@Overridepublic void onClick(View view) {if(view.getId() == R.id.btn_login) {String uname = edt_uname.getText().toString();String upass = edt_upass.getText().toString();if("aaa".equals(uname) && "123".equals(upass)) {Intent it = new Intent(this, MainActivity.class);startActivity(it);this.finish();}else{Toast.makeText(this, "用名或密码错误", Toast.LENGTH_LONG).show();edt_upass.setText("");edt_upass.setText("");}}}
}

MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener{private EditText edt_goods;private EditText edt_money;private EditText edt_remark;private Button btn_ji;private Button btn_look;private SQLiteDatabase db;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);register();InitDB();}private void register(){edt_goods = findViewById(R.id.goods);edt_money = findViewById(R.id.edt_money);edt_remark = findViewById(R.id.remark);btn_ji = findViewById(R.id.btn_ji);btn_look = findViewById(R.id.btn_look);btn_ji.setOnClickListener(this);btn_look.setOnClickListener(this);}private void InitDB() {db = openOrCreateDatabase("examDB", MODE_PRIVATE, null);db.execSQL("create table if not exists account(_id Integer primary key autoincrement, goods varchar, money double, remark varchar)");}@Overridepublic void onClick(View view) {if(view.getId() == R.id.btn_ji) {ji();}else{look();}}private void ji() {String insertSql = "insert into account(goods, money, remark)values(?,?,?)";String goods = edt_goods.getText().toString();double money = Double.valueOf(edt_money.getText().toString());String remark = edt_remark.getText().toString();Object[] ob = new Object[]{goods,money,remark};db.execSQL(insertSql, ob);Toast.makeText(this, "记录成功", Toast.LENGTH_LONG).show();edt_goods.setText("");edt_remark.setText("");edt_money.setText("");}private void look() {Intent it = new Intent(this, ListActivity.class);startActivity(it);}
}

MyAdapter.java

public class MyAdapter extends SimpleAdapter{private LayoutInflater inflater;private Context context;private ArrayList<HashMap<String,Object>> mData;int p;private SQLiteDatabase db;public MyAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to) {super(context, data, resource, from, to);this.context = context;mData = (ArrayList<HashMap<String, Object>>) data;this.db = context.openOrCreateDatabase("examDB", Context.MODE_PRIVATE, null);}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View v= super.getView(position, convertView, parent);Button btn_delete = (Button)v.findViewById(R.id.btn_delete);Button btn_update = (Button)v.findViewById(R.id.btn_update);p = position;btn_delete.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {new AlertDialog.Builder(context).setTitle("提示消息").setMessage("是否删除记录").setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {int id  = (int) mData.get(p).get("id");mData.remove(p);Toast.makeText(context, "删除"+Integer.toString(p),Toast.LENGTH_LONG).show();String sql = "delete from account where _id = ?";Object[] ob = new Object[]{id};db.execSQL(sql, ob);MyAdapter.this.notifyDataSetChanged();}}).setNegativeButton("取消", null).show();}});btn_update.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {int id  = (int) mData.get(p).get("id");String goods = (String)mData.get(p).get("goods");double money = (double)mData.get(p).get("money");String remark = (String)mData.get(p).get("remark");Intent it = new Intent(context, UpdateActivity.class);it.putExtra("goods", goods);it.putExtra("money", money);it.putExtra("remark", remark);it.putExtra("id", id);context.startActivity(it);}});return v;}
}

UpdateActivity.java

public class UpdateActivity extends Activity implements View.OnClickListener{private Button btn_update;private TextView goods;private TextView money;private TextView remark;private int id;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_update);Init();}public void Init() {Intent it = getIntent();goods = findViewById(R.id.goods);money = findViewById(R.id.money);remark = findViewById(R.id.remark);goods.setText(it.getStringExtra("goods"));money.setText(String.valueOf(it.getDoubleExtra("money", 0)));remark.setText(it.getStringExtra("remark"));id = it.getIntExtra("id", 0);btn_update = findViewById(R.id.btn_update);btn_update.setOnClickListener(this);}@Overridepublic void onClick(View view) {Intent it = new Intent(this, ListActivity.class);SQLiteDatabase db = openOrCreateDatabase("examDB", MODE_PRIVATE, null);String sql = "update account set goods=?,money=?, remark=? where _id=?";Object[] obj = new Object[]{goods.getText().toString(),Double.valueOf(money.getText().toString()),remark.getText().toString(),id};db.execSQL(sql, obj);startActivity(it);this.finish();}
}

2.2 xml

activity_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".ListActivity"><ListViewandroid:id="@+id/list"android:layout_width="match_parent"android:layout_height="match_parent"/></LinearLayout>

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"tools:context=".LoginActivity"><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="64dp"android:layout_marginTop="120dp"android:text="用户名"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><TextViewandroid:id="@+id/textView2"android:layout_width="wrap_content"android:layout_height="29dp"android:layout_marginBottom="244dp"android:layout_marginStart="76dp"android:text="密码"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintStart_toStartOf="parent" /><EditTextandroid:id="@+id/edt_uname"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="28dp"android:layout_marginTop="96dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/btn_login"android:layout_width="wrap_content"android:layout_height="49dp"android:layout_marginBottom="140dp"android:layout_marginEnd="190dp"android:layout_marginStart="106dp"android:text="登录"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent" /><EditTextandroid:id="@+id/edt_upass"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="244dp"android:layout_marginEnd="28dp"android:ems="10"android:inputType="textPassword"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"tools:context=".MainActivity"><TextViewandroid:id="@+id/textView3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="46dp"android:layout_marginTop="55dp"android:text="商品名"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><TextViewandroid:id="@+id/textView4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="46dp"android:layout_marginTop="76dp"android:text="金额"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toBottomOf="@+id/textView3" /><TextViewandroid:id="@+id/textView5"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="256dp"android:layout_marginStart="44dp"android:text="备注"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintStart_toStartOf="parent" /><Buttonandroid:id="@+id/btn_ji"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="132dp"android:layout_marginStart="83dp"android:text="记一笔"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintStart_toStartOf="parent" /><EditTextandroid:id="@+id/goods"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="34dp"android:layout_marginTop="27dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toTopOf="parent" /><EditTextandroid:id="@+id/edt_money"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="46dp"android:layout_marginEnd="34dp"android:layout_marginTop="49dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintBottom_toTopOf="@+id/remark"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toBottomOf="@+id/goods" /><EditTextandroid:id="@+id/remark"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="252dp"android:layout_marginEnd="32dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent" /><Buttonandroid:id="@+id/btn_look"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="132dp"android:layout_marginEnd="59dp"android:text="查看"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>

activity_update.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"tools:context=".UpdateActivity"><TextViewandroid:id="@+id/textView3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="46dp"android:layout_marginTop="55dp"android:text="商品名"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><TextViewandroid:id="@+id/textView4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="46dp"android:layout_marginTop="76dp"android:text="金额"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toBottomOf="@+id/textView3" /><TextViewandroid:id="@+id/textView5"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="256dp"android:layout_marginStart="44dp"android:text="备注"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintStart_toStartOf="parent" /><Buttonandroid:id="@+id/btn_update"android:layout_width="wrap_content"android:layout_height="61dp"android:layout_marginBottom="136dp"android:layout_marginEnd="213dp"android:layout_marginStart="83dp"android:text="更新"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="1.0"app:layout_constraintStart_toStartOf="parent" /><EditTextandroid:id="@+id/goods"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="34dp"android:layout_marginTop="27dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toTopOf="parent" /><EditTextandroid:id="@+id/money"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="46dp"android:layout_marginEnd="34dp"android:layout_marginTop="49dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintBottom_toTopOf="@+id/remark"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toBottomOf="@+id/goods" /><EditTextandroid:id="@+id/remark"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="252dp"android:layout_marginEnd="32dp"android:ems="10"android:inputType="textPersonName"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent" /></android.support.constraint.ConstraintLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:id="@+id/text_goods"android:layout_width="81dp"android:layout_height="38dp"android:layout_weight="1"android:text="TextView"android:textSize="18sp" /><TextViewandroid:id="@+id/text_money"android:layout_width="85dp"android:layout_height="38dp"android:layout_weight="1"android:text="TextView"android:textSize="18sp" /><TextViewandroid:id="@+id/text_remark"android:layout_width="90dp"android:layout_height="38dp"android:layout_weight="1"android:text="TextView"android:textSize="18sp" /><Buttonandroid:id="@+id/btn_update"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="更新" /><Buttonandroid:id="@+id/btn_delete"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="删除" />
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.asus.exam"><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"><activity android:name=".MainActivity"></activity><activity android:name=".LoginActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activity android:name=".ListActivity"/><activity android:name=".UpdateActivity"/></application></manifest>

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1、目录

2、代码

2.1 java

2.2 xml

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