Android的简易备忘录

一个简易的备忘录

实现效果如下

主界面
编辑界面
显示界面
删除界面

具体编程思路如下

由于想要仿照做项目那样，所以运用了mvc的模式。
目录结构如下

具体代码如下

MainActivity页面代码

package com.example.diary.controller.activity;import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;import com.example.diary.R;
import com.example.diary.controller.adaptet.DiaryListAdapter;
import com.example.diary.model.Model;
import com.example.diary.model.bean.Diaryinfo;import java.util.List;public class MainActivity extends AppCompatActivity {private ListView lv_main_diary;private ImageView iv_main_write;private DiaryListAdapter diaryListAdapter;private LocalBroadcastManager mLBM;private BroadcastReceiver DiaryReceiver=new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {refresh();}};private String title;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();initListener();refresh();}//刷新方法private void refresh() {List<Diaryinfo> diaryinfos = Model.getInstance().getDiaryTableDao().getDiaryByTitle();diaryListAdapter.refresh(diaryinfos);}private void initListener() {iv_main_write.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Intent intent = new Intent(MainActivity.this, DiaryActivity.class);startActivity(intent);}});}private void initData() {diaryListAdapter = new DiaryListAdapter(MainActivity.this);lv_main_diary.setAdapter(diaryListAdapter);//listview的item点击事件lv_main_diary.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {Diaryinfo diaryinfo = (Diaryinfo) adapterView.getItemAtPosition(position);Intent intent = new Intent(MainActivity.this,DiaryDetailActivity.class);intent.putExtra("title",diaryinfo.getTitle());intent.putExtra("content",diaryinfo.getContent());startActivity(intent);}});//接收到广播mLBM=LocalBroadcastManager.getInstance(MainActivity.this);mLBM.registerReceiver(DiaryReceiver,new IntentFilter("diary_change"));//绑定listview和contextmenuregisterForContextMenu(lv_main_diary);}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {super.onCreateContextMenu(menu, v, menuInfo);int position= ((AdapterView.AdapterContextMenuInfo)menuInfo).position;Diaryinfo diaryinfo = (Diaryinfo) lv_main_diary.getItemAtPosition(position);title = diaryinfo.getTitle();MainActivity.this.getMenuInflater().inflate(R.menu.delete,menu);}@Overridepublic boolean onContextItemSelected(@NonNull MenuItem item) {if(item.getItemId() == R.id.diary_delete){Model.getInstance().getDiaryTableDao().deleteDiary(title);refresh();return true;}return super.onContextItemSelected(item);}private void initView() {iv_main_write = findViewById(R.id.iv_main_write);lv_main_diary = findViewById(R.id.lv_main_diary);}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(DiaryReceiver);}
}

DiaryActivity页面代码

package com.example.diary.controller.activity;import androidx.appcompat.app.AppCompatActivity;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;import android.content.BroadcastReceiver;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;import com.example.diary.R;
import com.example.diary.model.Model;
import com.example.diary.model.bean.Diaryinfo;import java.text.SimpleDateFormat;
import java.util.Date;public class DiaryActivity extends AppCompatActivity {private TextView tvDiaryCancel;private TextView tvDiarySave;private EditText etDiaryTitle;private EditText etDiaryContent;private LocalBroadcastManager mLBM;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_diary);mLBM=LocalBroadcastManager.getInstance(DiaryActivity.this);initView();initListener();}private void initListener() {tvDiaryCancel.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {cancel();}});tvDiarySave.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {save();}});}//保存方法实现private void save() {String title = etDiaryTitle.getText().toString();String content = etDiaryContent.getText().toString();//设置时间SimpleDateFormat simpleDateFormat=new SimpleDateFormat("MM-dd HH:mm");Date time = new Date(System.currentTimeMillis());String date=simpleDateFormat.format(time);Diaryinfo diaryinfo=new Diaryinfo();diaryinfo.setTitle(title);diaryinfo.setContent(content);diaryinfo.setDate(date);Model.getInstance().getDiaryTableDao().saveDiary(diaryinfo);mLBM.sendBroadcast(new Intent("diary_change"));finish();}//取消方法实现private void cancel() {Intent intent = new Intent(DiaryActivity.this, MainActivity.class);startActivity(intent);}private void initView() {tvDiaryCancel = (TextView)findViewById( R.id.tv_diary_cancel );tvDiarySave = (TextView)findViewById( R.id.tv_diary_save );etDiaryTitle = (EditText)findViewById( R.id.et_diary_title );etDiaryContent = (EditText)findViewById( R.id.et_diary_content );}
}

DiaryDetailActivity页面代码

package com.example.diary.controller.activity;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;import com.example.diary.R;public class DiaryDetailActivity extends AppCompatActivity {private TextView tv_diarydetail_content;private TextView tv_diarydetail_title;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_diary_detail);initView();initData();}private void initData() {Intent intent = getIntent();tv_diarydetail_title.setText(intent.getStringExtra("title"));tv_diarydetail_content.setText(intent.getStringExtra("content"));}private void initView() {tv_diarydetail_title = findViewById(R.id.tv_diarydetail_title);tv_diarydetail_content = findViewById(R.id.tv_diarydetail_content);}
}

Diaryinfo页面代码

package com.example.diary.model.bean;public class Diaryinfo {private String id;private String title;private String content;private String date;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public String getDate() {return date;}public void setDate(String date) {this.date = date;}
}

DiaryTableDao页面代码

package com.example.diary.model.dao;import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;import com.example.diary.model.bean.Diaryinfo;
import com.example.diary.model.db.DiaryDB;import java.util.ArrayList;
import java.util.List;public class DiaryTableDao {private final DiaryDB mHelper;public DiaryTableDao(Context context){mHelper=new DiaryDB(context);}//添加日记public void saveDiary(Diaryinfo diaryinfo){SQLiteDatabase db=mHelper.getReadableDatabase();ContentValues values=new ContentValues();values.put(DiaryTable.COL_ID,diaryinfo.getId());values.put(DiaryTable.COL_TITLE,diaryinfo.getTitle());values.put(DiaryTable.COL_CONTENT,diaryinfo.getContent());values.put(DiaryTable.COL_DATE,diaryinfo.getDate());db.replace(DiaryTable.TAB_NAME,null,values);}//获取日记public List<Diaryinfo> getDiaryByTitle(){SQLiteDatabase db = mHelper.getReadableDatabase();String sql="select * from " + DiaryTable.TAB_NAME ;Cursor cursor = db.rawQuery(sql,null);List<Diaryinfo> diaryinfos=new ArrayList<>();while (cursor.moveToNext()){Diaryinfo diaryinfo=new Diaryinfo();diaryinfo.setId(cursor.getString(cursor.getColumnIndex(DiaryTable.COL_ID)));diaryinfo.setTitle(cursor.getString(cursor.getColumnIndex(DiaryTable.COL_TITLE)));diaryinfo.setContent(cursor.getString(cursor.getColumnIndex(DiaryTable.COL_CONTENT)));diaryinfo.setDate(cursor.getString(cursor.getColumnIndex(DiaryTable.COL_DATE)));diaryinfos.add(diaryinfo);}return diaryinfos;}//删除日记public void deleteDiary(String title){if (title==null){return;}SQLiteDatabase db = mHelper.getReadableDatabase();db.delete(DiaryTable.TAB_NAME,DiaryTable.COL_TITLE+"=?",new String[]{title});}}

Model页面代码

package com.example.diary.model;import android.content.Context;import com.example.diary.model.dao.DiaryTableDao;//数据模型全局类
public class Model {private Context mContext;private static Model model=new Model();private DiaryTableDao diaryTableDao;private Model(){}public static Model getInstance(){return model;}public void init(Context context){mContext=context;diaryTableDao=new DiaryTableDao(mContext);}public DiaryTableDao getDiaryTableDao(){return diaryTableDao;}}

IMApplication页面代码

package com.example.diary;import android.app.Application;
import android.content.Context;import com.example.diary.model.Model;public class IMApplication extends Application {private static Context mContext;@Overridepublic void onCreate() {super.onCreate();Model.getInstance().init(this);//初始化全局上下文对象mContext=this;}
}

结后语
这就是简易备忘录的设计，核心代码也已经贴出来了，剩下的一些细节，我后面也会把源码放出来的，实现的方法有的可能也有不妥，还望有大佬可以指出。
源码地址：https://download.csdn.net/download/TI_ZJW/12305790

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Android的简易备忘录

一个简易的备忘录

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