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【Java】记事本程序
作者:千如 / 发布于2015/5/25/ 721

	MainActivity

	package cn.dccssq;

	import android.app.ListActivity;
	import android.content.Intent;
	import android.database.Cursor;
	import android.os.Bundle;
	import android.util.Log;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.view.View;
	import android.widget.ListAdapter;
	import android.widget.ListView;
	import android.widget.SimpleCursorAdapter;

	public class MainActivity extends ListActivity {
	
	private static final int INSERT_ID = Menu.FIRST;
	
	private static final int DELETE_ID = Menu.FIRST + 1;
	
	private static final int ACTIVITY_CREATE = 0;
	
	private static final int ACTIVITY_EDIT = 1;
	
	private DiaryDbAdapter diaryDb;
	
	private Cursor cursor;
	 /** Called when the activity is first created. */
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.main);
	
	 diaryDb =new DiaryDbAdapter(this);
	 diaryDb.open();
	
	 }
	
	 private void showListView(){
	 cursor = diaryDb.getAllNotes();
	
	 String[] from = new String[]{DiaryDbAdapter.KEY_TITLE,DiaryDbAdapter.KEY_BODY};
	 int[] to = new int[]{R.id.text1,R.id.created};
	
	 ListAdapter cursorAdapter = new SimpleCursorAdapter(this,R.layout.diary_row,cursor,from,to);
	 setListAdapter(cursorAdapter);
	 }

	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
	 // TODO Auto-generated method stub
	 super.onListItemClick(l, v, position, id);
	 Cursor c = cursor;
	 c.move(position);
	 Intent intent = new Intent(this,ActivityDiary.class);
	 intent.putExtra(DiaryDbAdapter.KEY_ROWID, id);
	 intent.putExtra(DiaryDbAdapter.KEY_TITLE, c.getString(c
	 .getColumnIndexOrThrow(DiaryDbAdapter.KEY_TITLE)));
	 intent.putExtra(DiaryDbAdapter.KEY_BODY, c.getString(c
	 .getColumnIndexOrThrow(DiaryDbAdapter.KEY_BODY)));
	 startActivityForResult(intent, ACTIVITY_EDIT);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	 // TODO Auto-generated method stub
	 super.onActivityResult(requestCode, resultCode, data);
	 showListView();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	 // TODO Auto-generated method stub
	 super.onCreateOptionsMenu(menu);
	 menu.add(0,INSERT_ID,0,R.string.menu_insert);
	 menu.add(0,DELETE_ID,0,R.string.menu_delete);
	 return true;
	}

	@Override
	public boolean onMenuItemSelected(int featureId, MenuItem item) {
	 // TODO Auto-generated method stub
	 switch(item.getItemId()){
	 case INSERT_ID:
	 Log.i("INSERT:", String.valueOf(INSERT_ID));
	 createDiary();
	 return true;
	 case DELETE_ID:
	 Log.i("DELETE_ID:", String.valueOf(getListView().getSelectedItemId()));
	 diaryDb.deleteDiary(getListView().getSelectedItemId());
	 showListView();
	 return true;
	 }
	 return super.onMenuItemSelected(featureId, item);
	}
	
	private void createDiary(){
	
	 Intent intent = new Intent();
	 intent.setClass(this, ActivityDiary.class);
	 startActivityForResult(intent, ACTIVITY_CREATE);
	}
	}

	

	

	ActivityDiary

	package cn.dccssq;

	import android.app.Activity;
	import android.content.Intent;
	import android.os.Bundle;
	import android.util.Log;
	import android.view.View;
	import android.widget.Button;
	import android.widget.EditText;

	public class ActivityDiary extends Activity {

	// title EditText
	EditText titleTxt;
	// body EditText
	EditText bodyTxt;
	// save Button
	Button btn;
	// Row Id
	Long rowId;
	private DiaryDbAdapter diaryDb;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	 // TODO Auto-generated method stub
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.notepad);
	
	 // Initialize the DiaryDbAdapter.
	 diaryDb = new DiaryDbAdapter(this);
	
	 // Get the screen control
	 titleTxt = (EditText)findViewById(R.id.title);
	 bodyTxt = (EditText)findViewById(R.id.body_text);
	 btn = (Button)findViewById(R.id.button);
	 rowId = null ;
	
	 // Get data from the front page
	 Bundle bundle = getIntent().getExtras();
	
	 if(bundle!=null){
	 Log.i("bund:",bundle.toString());
	
	 // Set data to page
	 String title = bundle.getString(DiaryDbAdapter.KEY_TITLE);
	 String body = bundle.getString(DiaryDbAdapter.KEY_BODY);
	 rowId = bundle.getLong(DiaryDbAdapter.KEY_ROWID);
	 if(title!=null)
	 {
	 titleTxt.setText(title);
	 }
	 if(body!=null)
	 {
	 bodyTxt.setText(body);
	 }
	 }
	
	 btn.setOnClickListener(new View.OnClickListener() {
	
	 public void onClick(View arg0) {
	 // TODO Auto-generated method stub
	 String title = titleTxt.getText().toString();
	 String body = bodyTxt.getText().toString();
	 if(checkInput(title, body)){
	 diaryDb.open();
	 if(rowId!=null){
	 diaryDb.updateDiary(rowId, title, body);
	 }else{
	 diaryDb.createDiary(title, body);
	 }
	 diaryDb.close();
	
	 Intent mIntent = new Intent();
	 setResult(RESULT_OK, mIntent);
	
	 finish();
	 }
	 }
	 });
	}

	/**
	 * Validate the input.
	 * @param title
	 * @param body
	 * @return
	 */
	public boolean checkInput(String title ,String body){
	
	 if(null==title || title.trim().length()==0){
	 titleTxt.setError("Please input the title!");
	 return false;
	 }
	
	 if(null==body || body.trim().length()==0){
	 bodyTxt.setError("Please input the content!");
	 return false;
	 }
	 return true;
	}
	}

	

	DiaryDbAdapter DB操作类，提供了两种增删查改的功能代码

	package cn.dccssq;

	import java.util.Calendar;

	import android.content.ContentValues;
	import android.content.Context;
	import android.database.Cursor;
	import android.database.SQLException;
	import android.database.sqlite.SQLiteDatabase;
	import android.database.sqlite.SQLiteException;

	public class DiaryDbAdapter {
	public static final String KEY_TITLE = "title";
	public static final String KEY_BODY = "body";
	public static final String KEY_ROWID = "_id";
	public static final String KEY_CREATED = "created";
	
	private DatabaseHelper databaseHelper;
	
	private Context context;
	
	private SQLiteDatabase sqliteDatabase;

	public DiaryDbAdapter(Context context) {
	 this.context = context;
	}
	
	/**
	 * Open the Database
	 */
	public void open(){
	 databaseHelper = new DatabaseHelper(context);
	
	 try
	 {
	 sqliteDatabase = databaseHelper.getWritableDatabase();
	 }catch(SQLiteException e){
	 sqliteDatabase = databaseHelper.getReadableDatabase();
	 }
	}
	
	/**
	 * Close the Database
	 */
	public void close()
	{
	 sqliteDatabase.close();
	}
	
	/**
	 * Insert the Data
	 * @param title
	 * @param body
	 * @return
	 */
	public long createDiary(String title,String body){
	
	 ContentValues content = new ContentValues();
	 content.put(KEY_TITLE, title);
	 content.put(KEY_BODY, body);
	 Calendar calendar = Calendar.getInstance();
	 String created = calendar.get(Calendar.YEAR) + "/"
	 + calendar.get(Calendar.MONTH) + "/"
	 + calendar.get(Calendar.DAY_OF_MONTH) + " "
	 + calendar.get(Calendar.HOUR_OF_DAY) + ":"
	 + calendar.get(Calendar.MINUTE);
	 content.put(KEY_CREATED, created);
	
	 return sqliteDatabase.insert(databaseHelper.DATABSE_TABLE, null, content);
	}
	
	/**
	 * Delete the record
	 * @param rowId
	 * @return
	 */
	public boolean deleteDiary(long rowId){
	
	 String whereString = KEY_ROWID + "=" + rowId;
	 return sqliteDatabase.delete(databaseHelper.DATABSE_TABLE, whereString, null)>0;
	}
	
	/**
	 * Get all Records
	 * @return
	 */
	public Cursor getAllNotes()
	{
	 String[] searchResult = {KEY_ROWID, KEY_TITLE,KEY_BODY, KEY_CREATED};
	 return sqliteDatabase.query(databaseHelper.DATABSE_TABLE, searchResult, null, null, null, null, null);
	}
	
	/**
	 * Get the record by condition
	 * @param rowId
	 * @return
	 * @throws SQLException
	 */
	public Cursor getDiary(long rowId) throws SQLException{
	
	 String[] searchResult = {KEY_ROWID, KEY_TITLE,KEY_BODY, KEY_CREATED};
	 String whereString = KEY_ROWID + "=" + rowId;
	
	 Cursor mCursor = sqliteDatabase.query(true, databaseHelper.DATABSE_TABLE, searchResult, whereString, null, null, null, null, null);
	 if(mCursor!=null){
	 mCursor.moveToFirst();
	 }
	 return mCursor;
	}
	
	public boolean updateDiary(long rowId ,String title,String body){
	
	 ContentValues values = new ContentValues();
	 values.put(KEY_ROWID, title);
	 values.put(KEY_BODY,body);
	
	 Calendar calendar = Calendar.getInstance();
	 String created = calendar.get(Calendar.YEAR) + "/"
	 + calendar.get(Calendar.MONTH) + "/"
	 + calendar.get(Calendar.DAY_OF_MONTH) + " "
	 + calendar.get(Calendar.HOUR_OF_DAY) + ":"
	 + calendar.get(Calendar.MINUTE);
	 values.put(KEY_CREATED, created);
	 String whereString = KEY_ROWID + "=" + rowId;
	
	 return sqliteDatabase.update(databaseHelper.DATABSE_TABLE, values, whereString, null)>0;
	}
	
	public void xinjianDiary(String title,String body){
	
	 Calendar calendar = Calendar.getInstance();
	 String created = calendar.get(Calendar.YEAR) + "/"
	 + calendar.get(Calendar.MONTH) + "/"
	 + calendar.get(Calendar.DAY_OF_MONTH) + " "
	 + calendar.get(Calendar.HOUR_OF_DAY) + ":"
	 + calendar.get(Calendar.MINUTE);
	
	 String insertSQL = "INSERT INTO " + databaseHelper.DATABSE_TABLE
	 +"(" + KEY_ROWID +"," + KEY_TITLE+"," + KEY_BODY +"," + KEY_CREATED + ")"
	 + " values (?,?,?,?)" ;
	 Object[] args = {null,title,body,created};
	 sqliteDatabase.execSQL(insertSQL, args);
	}
	
	public void bianjiDiary(long rowId ,String title,String body){
	 Calendar calendar = Calendar.getInstance();
	 String created = calendar.get(Calendar.YEAR) + "/"
	 + calendar.get(Calendar.MONTH) + "/"
	 + calendar.get(Calendar.DAY_OF_MONTH) + " "
	 + calendar.get(Calendar.HOUR_OF_DAY) + ":"
	 + calendar.get(Calendar.MINUTE);
	
	 String updateSQL = "update " + databaseHelper.DATABSE_TABLE
	 +" set " + KEY_TITLE+"=? ," + KEY_BODY +"=? ," + KEY_CREATED + "=? "
	 + " where " + KEY_ROWID + "= ?" ;
	 Object[] args = {title,body,created,rowId};
	 sqliteDatabase.execSQL(updateSQL, args);
	}
	
	public void shanchuDiary(long rowId ){
	 String deleteSQL = "delete from "+ databaseHelper.DATABSE_TABLE +" where " + KEY_ROWID + "= ?" ;
	 Object[] args = {rowId};
	 sqliteDatabase.execSQL(deleteSQL, args);
	}
	
	public Cursor qudeAllNotes()
	{
	 String searchSQL = "select _id , title , body ,created from "+ databaseHelper.DATABSE_TABLE;
	 return sqliteDatabase.rawQuery(searchSQL, null);
	}
	}

	

	DatabaseHelper

	package cn.dccssq;

	import android.content.Context;
	import android.database.sqlite.SQLiteDatabase;
	import android.database.sqlite.SQLiteOpenHelper;

	public class DatabaseHelper extends SQLiteOpenHelper {

	private final static String DATABSE_NAME = "notepad";
	private final static int DATABASE_VERSION = 1;
	public final static String DATABSE_TABLE = "diary";
	
	private final static String DATABASE_CREATE = "create table " + DATABSE_TABLE + " (_id integer primary key autoincrement,"
	 + "title text not null, body text not null, created text not null);";
	public DatabaseHelper(Context context) {
	 super(context, DATABSE_NAME, null, DATABASE_VERSION);
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
	 db.execSQL(DATABASE_CREATE);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
	 db.execSQL("DROP TABLE IF EXISTS " + DATABSE_TABLE);
	 onCreate(db);
	}

	}

	

	

	main.xml

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:orientation="vertical"
	 android:layout_width="fill_parent"
	 android:layout_height="fill_parent"
	 >
	 <ListView
	 android:id="@+id/android:list"
	 android:layout_width="wrap_content"
	 android:layout_height="wrap_content" />
	 <TextView
	 android:id="@+id/android:empty"
	 android:layout_width="wrap_content"
	 android:layout_height="wrap_content"
	 android:text="您还没有开始写日记呢!点击下边的Menu按钮开始写日记吧:)" />
	</LinearLayout>

	

	diary_row.xml

	<?xml version="1.0" encoding="utf-8" ?>
	<RelativeLayout
	android:id="@+id/row"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<TextView
	android:id="@+id/text1"
	android:layout_width="wrap_content"
	android:layout_height="30px"
	android:maxWidth="200dip"
	android:textSize="22sp"
	android:layout_marginTop="10dip"
	android:text="第一组第一项" />
	<TextView
	android:id="@+id/created"
	android:layout_width="wrap_content"
	android:layout_height="35px"
	android:layout_alignParentRight="true"
	android:layout_marginLeft="10dip"
	android:layout_marginTop="10dip"
	android:text="1999年12月3号" />
	</RelativeLayout>

	

	notepadxml

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:orientation="vertical"
	 android:layout_width="fill_parent"
	 android:layout_height="fill_parent"
	 >
	<TextView
	android:text="@string/notepad_title"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"></TextView>
	<EditText
	android:id="@+id/title"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"></EditText>
	<TextView
	android:text="@string/notepad_body"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"></TextView>
	<EditText
	android:id="@+id/body_text"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"></EditText>
	<Button
	android:id="@+id/button"
	android:text="@string/notepad_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"></Button>
	</LinearLayout>

	

	

	strings.xml

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	 <string name="hello">Hello World, MainActivity!</string>
	 <string name="app_name">db2</string>
	
	 <string name="diary_edit">编辑</string>
	 <string name="notepad_title">标题:</string>
	 <string name="notepad_body">内容:</string>
	 <string name="notepad_button">确定:</string>
	 <string name="menu_insert">Add</string>
	 <string name="menu_delete">Delete</string>
	 <string name="edit_diary">Edit</string>
	</resources>

	

	AndroidManifest.xml

	<?xml version="1.0" encoding="utf-8"?>
	<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	 package="cn.dccssq"
	 android:versionCode="1"
	 android:versionName="1.0">
	 <application android:icon="@drawable/icon" android:label="@string/app_name">
	 <activity android:name=".MainActivity"
	 android:label="@string/app_name">
	 <intent-filter>
	 <action android:name="android.intent.action.MAIN" />
	 <category android:name="android.intent.category.LAUNCHER" />
	 </intent-filter>
	 </activity>
	 <activity android:name=".ActivityDiary">
	 </activity>
	 </application>
	 <uses-sdk android:minSdkVersion="8" />

	</manifest>
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