android 备忘录之简单实现

首先创建保存备忘录信息的表：

DbHelper.java

package com.cjq.androidbwl;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.database.sqlite.SQLiteOpenHelper;/** *  * @author cjianquan * @since 2014年10月31日 */public class DbHelper extends SQLiteOpenHelper {public DbHelper(Context context, String name, CursorFactory factory,int version) {super(context, name, factory, version);// TODO Auto-generated constructor stub}@Overridepublic void onCreate(SQLiteDatabase db) {StringBuilder sql = new StringBuilder();sql.append("create table if not exists tb_bwl(").append("id integer primary key autoincrement,").append("title varchar(50),").append("content varchar(200),").append("createDate varchar(10),").append("noticeDate varchar(10),").append("noticeTime varchar(5) )");db.execSQL(sql.toString());}@Overridepublic void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {// TODO Auto-generated method stub}}

MainActivity.java 

package com.cjq.androidbwl;import java.util.Calendar;import android.app.Activity;import android.app.AlarmManager;import android.app.Dialog;import android.app.PendingIntent;import android.app.TimePickerDialog;import android.content.Context;import android.content.Intent;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.util.Log;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.MenuItem;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.AdapterContextMenuInfo;import android.widget.AdapterView.OnItemClickListener;import android.widget.ImageButton;import android.widget.ListView;import android.widget.SimpleCursorAdapter;import android.widget.TextView;import android.widget.TimePicker;import android.widget.Toast;/** *  * @author cjianquan * @since 2014年10月31日 */public class MainActivity extends Activity {private AlarmManager alarmManager=null;Calendar cal=Calendar.getInstance();final int DIALOG_TIME = 0; //设置对话框idprivate DbHelper dbhelper;private SQLiteDatabase db;  SimpleCursorAdapter adapter = null;ListView lv;/* (non-Javadoc) * @see android.app.Activity#onCreate(android.os.Bundle) */@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);alarmManager=(AlarmManager)getSystemService(Context.ALARM_SERVICE);dbhelper = new DbHelper(this, "db_bwl", null, 1);db = dbhelper.getReadableDatabase();Cursor cursor = db.query("tb_bwl", new String[]{"id as _id","title","content","noticeDate","noticeTime"}, null, null, null, null,null);lv = (ListView)findViewById(R.id.lv_bwlList);adapter = new SimpleCursorAdapter(this, R.layout.list_item_bwl, cursor, new String[]{"title","noticeDate","noticeTime","content"}, new int[]{R.id.title,R.id.noticeDate,R.id.noticeTime,R.id.content});//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, getDatas());lv.setAdapter(adapter);this.registerForContextMenu(lv);lv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {String title = ((TextView)view.findViewById(R.id.title)).getText().toString();String content = ((TextView)view.findViewById(R.id.content)).getText().toString();String noticeDate = ((TextView)view.findViewById(R.id.noticeDate)).getText().toString();String noticeTime = ((TextView)view.findViewById(R.id.noticeTime)).getText().toString();Intent intent = new Intent();intent.setClass(MainActivity.this,AddBwlActivity.class);Bundle bundle = new Bundle();bundle.putLong("id", id);bundle.putString("title", title);bundle.putString("content", content);bundle.putString("noticeDate", noticeDate);bundle.putString("noticeTime", noticeTime);intent.putExtras(bundle);startActivity(intent);}});//添加备忘录按钮ImageButton btnAdd = (ImageButton)findViewById(R.id.btnAdd);btnAdd.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Intent intent = new Intent(MainActivity.this,AddBwlActivity.class);startActivity(intent);}});////创建两个Intent,一个是用于AlarmReceiver类处理的，一个是用于广播的//AlarmManager am = (AlarmManager)getSystemService(Context.ALARM_SERVICE);//Intent intent = new Intent(MainActivity.this,AlarmReceiver.class);//intent.setAction("ALARM_ACTION");//PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);//////设置真正能让alarm起作用的参数////设置alarm是以何种方式发生的，这里用的是以UTC时间为基准，并在alarm发生时同时唤醒设备的模式。//am.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),pendingIntent);//am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10*1000, 60*60*1000, pendingIntent);}//长按的上下文菜单public void onCreateContextMenu(ContextMenu menu,View view,ContextMenuInfo menuInfo){menu.setHeaderIcon(R.drawable.alarm);menu.add(0,3,0,"修改");menu.add(0,4,0,"删除");}public boolean onContextItemSelected(MenuItem item){AdapterContextMenuInfo menuInfo = (AdapterContextMenuInfo)item.getMenuInfo();switch(item.getItemId()){case 3:String title = ((TextView)menuInfo.targetView.findViewById(R.id.title)).getText().toString();String content = ((TextView)menuInfo.targetView.findViewById(R.id.content)).getText().toString();String noticeDate = ((TextView)menuInfo.targetView.findViewById(R.id.noticeDate)).getText().toString();String noticeTime = ((TextView)menuInfo.targetView.findViewById(R.id.noticeTime)).getText().toString();Intent intent = new Intent();intent.setClass(this,AddBwlActivity.class);Bundle bundle = new Bundle();bundle.putLong("id", menuInfo.id);bundle.putString("title", title);bundle.putString("content", content);bundle.putString("noticeDate", noticeDate);bundle.putString("noticeTime", noticeTime);intent.putExtras(bundle);startActivity(intent);break;case 4:dbhelper = new DbHelper(this, "db_bwl", null, 1);db = dbhelper.getWritableDatabase();int status = db.delete("tb_bwl", "id=?", new String[]{""+menuInfo.id});if(status!=-1){//删除后更新listviewCursor cursor = db.query("tb_bwl", new String[]{"id as _id","title","content","noticeDate","noticeTime"}, null, null, null, null,null);adapter.changeCursor(cursor);//adapter.notifyDataSetChanged();Toast.makeText(this, "删除成功", Toast.LENGTH_LONG).show();}else{Toast.makeText(this, "删除失败", Toast.LENGTH_LONG).show();}break;}return true;}@Overrideprotected Dialog onCreateDialog(int id) {Dialog dialog=null;switch (id) {case DIALOG_TIME:dialog=new TimePickerDialog(this,new TimePickerDialog.OnTimeSetListener(){public void onTimeSet(TimePicker timePicker, int hourOfDay,int minute) {Calendar c=Calendar.getInstance();//获取日期对象 c.setTimeInMillis(System.currentTimeMillis()); //设置Calendar对象c.set(Calendar.HOUR, hourOfDay); //设置闹钟小时数c.set(Calendar.MINUTE, c.get(Calendar.MINUTE)+1); //设置闹钟的分钟数c.set(Calendar.SECOND, 0); //设置闹钟的秒数c.set(Calendar.MILLISECOND, 0); //设置闹钟的毫秒数Intent intent = new Intent(MainActivity.this, AlarmReceiver.class); //创建Intent对象//intent.setAction("ALARM_ACTION");PendingIntent pi = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0); //创建PendingIntent//参数说明：http://www.eoeandroid.com/blog-119358-2995.htmlalarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+30000, pi); //设置闹钟，当前时间就唤醒Toast.makeText(MainActivity.this, "闹钟设置成功", Toast.LENGTH_LONG).show();//提示用户}},cal.get(Calendar.HOUR_OF_DAY),cal.get(Calendar.MINUTE),true);break;}Log.e("AndroidBWL", "onCreateDialog end...");return dialog;}@Overrideprotected void onResume() {super.onResume();Cursor cursor = db.query("tb_bwl", new String[]{"id as _id","title","content","noticeDate","noticeTime"}, null, null, null, null,null);adapter.changeCursor(cursor);}}

添加activity

AddBwlActivity.java

package com.cjq.androidbwl;import java.util.Calendar;import java.util.Date;import android.app.Activity;import android.app.AlarmManager;import android.app.DatePickerDialog;import android.app.PendingIntent;import android.app.DatePickerDialog.OnDateSetListener;import android.app.Dialog;import android.app.TimePickerDialog;import android.app.TimePickerDialog.OnTimeSetListener;import android.content.ContentValues;import android.content.Context;import android.content.Intent;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.DatePicker;import android.widget.EditText;import android.widget.TimePicker;import android.widget.Toast;/** *  * @author cjianquan * @since 2014年10月31日 */public class AddBwlActivity extends Activity {private EditText etDate = null,etTime=null,etTitle=null,etContent=null;private Button btnSave = null;static final int DATE_DIALOG_ID = 0;static final int TIME_DIALOG_ID = 1;private DbHelper dbhelper; Bundle bundle;  @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.add_bwl);dbhelper = new DbHelper(this, "db_bwl", null, 1);etTitle = (EditText)findViewById(R.id.etTitle);etContent = (EditText)findViewById(R.id.etContent);etDate = (EditText)findViewById(R.id.etDate);etDate.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {//并会调用 onCreateDialog(int)回调函数来请求一个Dialog  showDialog(DATE_DIALOG_ID);}});etTime = (EditText)findViewById(R.id.etTime);etTime.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {//并会调用 onCreateDialog(int)回调函数来请求一个Dialog  showDialog(TIME_DIALOG_ID);}});btnSave = (Button)findViewById(R.id.btnSave);btnSave.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {ContentValues value = new ContentValues();  String title = etTitle.getText().toString();String content = etContent.getText().toString();String noticeDate = etDate.getText().toString();String noticeTime = etTime.getText().toString();value.put("title", title);value.put("content", content);value.put("noticeDate", noticeDate);value.put("noticeTime", noticeTime);SQLiteDatabase db = dbhelper.getWritableDatabase();long id = 0;long status = 0;if(bundle!=null){id = bundle.getLong("id"); status = db.update("tb_bwl", value, "id=?", new String[]{bundle.getLong("id")+""});  }else{status = db.insert("tb_bwl", null, value); id = status;}if(status!=-1){setAlarm(id);Toast.makeText(AddBwlActivity.this, "保存成功", Toast.LENGTH_LONG).show();                  }else{                      Toast.makeText(AddBwlActivity.this, "保存失败", Toast.LENGTH_LONG).show();                  }  }});//获取上一个activity的传值bundle = this.getIntent().getExtras();if(bundle!=null){etDate.setText(bundle.getString("noticeDate"));etTime.setText(bundle.getString("noticeTime"));etTitle.setText(bundle.getString("title"));etContent.setText(bundle.getString("content"));}}private OnDateSetListener dateSetListener = new OnDateSetListener() {@Overridepublic void onDateSet(DatePicker datePicker, int year, int month, int day) {StringBuilder dateStr = new StringBuilder();dateStr.append(year).append("-").append(month+1).append("-").append(day);etDate.setText(dateStr.toString());}};private OnTimeSetListener timeSetListener = new OnTimeSetListener() {@Overridepublic void onTimeSet(TimePicker timePicker, int hour, int minute) {StringBuilder timeStr = new StringBuilder();timeStr.append(hour).append(":").append(minute);etTime.setText(timeStr.toString());}};/**      * 当Activity调用showDialog函数时会触发该函数的调用     */  protected Dialog onCreateDialog(int id){Calendar cal = Calendar.getInstance();cal.setTime(new Date());switch(id){case DATE_DIALOG_ID:DatePickerDialog dpd = new DatePickerDialog(this,dateSetListener, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH));dpd.setCancelable(true);dpd.setTitle("选择日期");dpd.show();break;case TIME_DIALOG_ID:TimePickerDialog tpd = new TimePickerDialog(this, timeSetListener, cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE), true);tpd.setCancelable(true);tpd.setTitle("选择时间");tpd.show();break;default:break;}return null;}private AlarmManager alarmManager=null;public void setAlarm(long id){Log.e("AndroidBWL", "setAlarm start...");String noticeDate = etDate.getText().toString();String noticeTime = etTime.getText().toString();Calendar calendar = Calendar.getInstance();calendar.set(Integer.parseInt(noticeDate.split("-")[0]), Integer.parseInt(noticeDate.split("-")[1])-1, Integer.parseInt(noticeDate.split("-")[2]), Integer.parseInt(noticeTime.split(":")[0]), Integer.parseInt(noticeTime.split(":")[1]));Log.e("AndroidBWL", ""+(calendar.getTimeInMillis()-System.currentTimeMillis()));alarmManager=(AlarmManager)getSystemService(Context.ALARM_SERVICE);Intent intent = new Intent(AddBwlActivity.this, AlarmReceiver.class); //创建Intent对象Bundle bundle = new Bundle();bundle.putLong("id", id);bundle.putString("title", etTitle.getText().toString());bundle.putString("content", etContent.getText().toString());bundle.putString("noticeDate", etDate.getText().toString());bundle.putString("noticeTime", etTime.getText().toString());intent.putExtras(bundle);//PendingIntent.getBroadcast intent 数据不更新。//传不同的 action 来解决这个问题intent.setAction("ALARM_ACTION"+calendar.getTimeInMillis());PendingIntent pi = PendingIntent.getBroadcast(AddBwlActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); //创建PendingIntent//参数说明：http://www.eoeandroid.com/blog-119358-2995.htmlalarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis()+5000, pi); //设置闹钟，当前时间就唤醒Log.e("AndroidBWL", "setAlarm end...");}}

提醒的广播接收：

AlarmReceiver.java

package com.cjq.androidbwl;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.util.Log;/** *  * @author cjianquan * @since 2014年10月29日 */public class AlarmReceiver extends BroadcastReceiver { private Intent mIntent = null;   private PendingIntent mPendingIntent = null;   private Notification mNotification = null;   private NotificationManager mNotificationManager = null;  @Overridepublic void onReceive(Context context, Intent intent) {Log.e("AndroidBWL", "AlarmReceiver:onReceive");mIntent = intent;Bundle bundle = mIntent.getExtras();mNotificationManager = (NotificationManager)context.getSystemService(context.NOTIFICATION_SERVICE);  //        mIntent = new Intent(context,AddBwlActivity.class);          mIntent.setClass(context,AddBwlActivity.class);                mPendingIntent = PendingIntent.getActivity(context, 0, mIntent, 0);          mNotification = new Notification();          mNotification.icon = R.drawable.alarm;          mNotification.tickerText="备忘录";        //设置默认声音、默认振动、和默认闪光灯        mNotification.defaults = Notification.DEFAULT_ALL;        //点击通知后自动取消        mNotification.flags |= Notification.FLAG_AUTO_CANCEL;        mNotification.setLatestEventInfo(context, bundle.getString("title"), bundle.getString("content"), mPendingIntent);          mNotificationManager.notify(1,mNotification); }}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.cjq.androidbwl"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="14"        android:targetSdkVersion="14" />    <application        android:allowBackup="true"        android:icon="@drawable/alarm"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.cjq.androidbwl.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="com.cjq.androidbwl.AlarmActivity" />        <activity android:name="com.cjq.androidbwl.NotifitionActivity" />        <activity android:name="com.cjq.androidbwl.AddBwlActivity" />        <receiver android:name="com.cjq.androidbwl.AlarmReceiver" android:process=":remote"></receiver>    </application>        <!-- 添加操作振动器的权限-->    <uses-permission android:name="android.permission.VIBRATE"></uses-permission>    <!-- 添加操作闪光灯的权限 -->    <uses-permission android:name="android.permission.FLASHLIGHT"></uses-permission></manifest>

布局文件：

activity_main.xml

<LinearLayout xmlns: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"    android:orientation="vertical"    android:layout_gravity="right"    tools:context=".MainActivity" >        <ImageButton android:id="@+id/btnAdd"        android:paddingLeft="10dp"        android:alpha="70"        android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/add" />        <ListView android:id="@+id/lv_bwlList"        android:layout_width="match_parent"        android:layout_height="match_parent">            </ListView></LinearLayout>

list_item_bwl.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <LinearLayout android:layout_width="match_parent"        android:layout_height="fill_parent"        android:width="0dp"        android:orientation="horizontal"        android:gravity="right">                <TextView        android:id="@+id/title"        android:width="0dp"        android:layout_weight="1.0"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:textSize="20sp" />                <TextView android:id="@+id/noticeDate"          android:textSize="10sp"        android:width="0dp"        android:layout_weight="3.0"        android:layout_width="match_parent"          android:layout_height="match_parent"/>                  <TextView android:id="@+id/noticeTime"         android:textSize="10sp"         android:width="0dp"        android:layout_weight="3.0"        android:layout_width="match_parent"          android:layout_height="match_parent"/>            </LinearLayout>            <TextView android:id="@+id/content"        android:layout_width="match_parent"          android:layout_height="match_parent"/>            </LinearLayout>

add_bwl.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_gravity="left"    android:textSize="25sp"    android:orientation="vertical" >    <TextView android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/title"/>    <EditText android:id="@+id/etTitle"        android:hint="请输入标题"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>        <TextView android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="日期"/>        <EditText android:id="@+id/etDate"        android:hint="请选择日期"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>        <TextView android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="时间"/>    <EditText android:id="@+id/etTime"        android:hint="请选择时间"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>        <TextView android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/content"/>    <EditText android:id="@+id/etContent"        android:hint="请输入内容"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>                    <Button android:id="@+id/btnSave"        android:text="保存"        android:textSize="40sp"        android:layout_width="match_parent"        android:layout_height="wrap_content"/></LinearLayout>

设置全局背景图片：

styles.xml

<resources xmlns:android="http://schemas.android.com/apk/res/android">    <!--        Base application theme, dependent on API level. This theme is replaced        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.    -->    <style name="AppBaseTheme" parent="android:Theme.Light">        <!--            Theme customizations available in newer API levels can go in            res/values-vXX/styles.xml, while customizations related to            backward-compatibility can go here.        -->    </style>    <!-- Application theme. -->    <style name="AppTheme" parent="AppBaseTheme">        <!-- All customizations that are NOT specific to a particular API-level can go here. -->        <item name="android:windowBackground">@drawable/shade</item>    </style>    </resources>