本文實例講述了Android編程實現鬧鐘的方法。分享給大家供大家參考，具體如下：
在Android中，有一個鬧鐘的類，AlarmManager類，我們可以通過其來對系統內的通知進行操作！
本文用到了Service和Broadcast兩個后臺管理，在處理時，曾出現過很多問題，但經過半天的努力，終于解決了！
首先是Main.xml文件：
<?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:id="@+id/mText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/setTimeButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/setTimeButton" /> <Button android:id="@+id/cancelButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/cancelButton" /></LinearLayout>
MainActivity.Java:
package com.chiefcto.Alarm;import java.text.Format;import java.util.Calendar;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.app.TimePickerDialog;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class MainActivity extends Activity { //Properties private Button msetButton; private Button mcancelButton; private AlermReceiver uIReceiver; private TextView mTextView; //就用了Java的日歷 private Calendar calendar; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); calendar = Calendar.getInstance(); mTextView = (TextView)this.findViewById(R.id.mText); msetButton = (Button)this.findViewById(R.id.setTimeButton); mcancelButton = (Button)findViewById(R.id.cancelButton); msetButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub calendar.setTimeInMillis(System.currentTimeMillis()); int hour = calendar.get(Calendar.HOUR_OF_DAY); int minute = calendar.get(Calendar.MINUTE); new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { calendar.setTimeInMillis(System.currentTimeMillis()); //set(f, value) changes field f to value. calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); calendar.set(Calendar.MINUTE, minute); calendar.set(Calendar.SECOND, 0); calendar.set(Calendar.MILLISECOND, 0); Intent intent = new Intent(MainActivity.this, AlermReceiver.class); intent.putExtra("music", true); PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0); AlarmManager am; //獲取系統進程 am = (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); //設置周期！！ am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(10*1000), (24*60*60*1000), pendingIntent); String tmps = "設置鬧鐘時間為："+format(hourOfDay)+":"+format(minute); mTextView.setText(tmps); } },hour,minute,true).show(); } }); mcancelButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, AlermReceiver.class); intent.putExtra("music", true); PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0); AlarmManager am; //獲取系統進程 am = (AlarmManager)getSystemService(ALARM_SERVICE); //cancel am.cancel(pendingIntent); mTextView.setText("取消了！"); } }); } private String format(int x) { String s = ""+x; if(s.length() == 1) s = "0"+s; return s; }}AlarmService.java
package com.chiefcto.Alarm;import java.io.IOException;import android.app.Service;import android.content.Context;import android.content.Intent;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.RingtoneManager;import android.net.Uri;import android.os.Binder;import android.os.Bundle;import android.os.IBinder;public class AlarmService extends Service { // MediaPlayer實例 private MediaPlayer player; // IBinder實例 @Override public IBinder onBind(Intent intent) { playMusic(); return null; } @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); playMusic(); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (player != null) { player.stop(); player.release(); } } @Override public void onStart(Intent intent, int startId) { // TODO Auto-generated method stub super.onStart(intent, startId); if (intent != null) { Bundle bundle = intent.getExtras(); if (bundle != null) { if(bundle.getBoolean("music")) playMusic(); else stopMusic(); } } } public void playMusic() { if(player == null) { Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM); try { player = new MediaPlayer(); player.setDataSource(this, uri); final AudioManager audioManager = (AudioManager)this .getSystemService(Context.AUDIO_SERVICE); if (audioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) { player.setAudioStreamType(AudioManager.STREAM_ALARM); player.setLooping(true); player.prepare(); } } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } if(!player.isPlaying()) { player.start(); } } public void stopMusic() { if (player != null) { player.stop(); try { // 在調用stop后如果需要再次通過start進行播放,需要之前調用prepare函數 player.prepare(); } catch (IOException ex) { ex.printStackTrace(); } } }}下面就是本文的關鍵性代碼，了解Activity到Broadcast的機制，這小應用就很好實現了~
AlermReceiver.java
package com.chiefcto.Alarm;import java.io.IOException;import java.util.Calendar;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.RingtoneManager;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.widget.Toast;public class AlermReceiver extends BroadcastReceiver { private MediaPlayer mMediaPlayer; Context context; @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); int minute = calendar.get(Calendar.MINUTE); CharSequence text = String.valueOf(minute); Toast.makeText(context, text, Toast.LENGTH_LONG).show(); this.context = context; Bundle bundle = intent.getExtras(); Intent serviceIntent = new Intent("chief_musicService"); serviceIntent.putExtras(bundle); if(bundle != null) { Log.i("CTO", String.valueOf(bundle.getBoolean("music"))); if(bundle.getBoolean("music")) context.startService(serviceIntent); else context.stopService(serviceIntent); } //在這里是播放不了的！！ //playAlarmRing(); } private void playAlarmRing() { Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM); try { mMediaPlayer = new MediaPlayer(); mMediaPlayer.setDataSource(context, uri); final AudioManager audioManager = (AudioManager) context .getSystemService(Context.AUDIO_SERVICE); if (audioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) { mMediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM); mMediaPlayer.setLooping(true); mMediaPlayer.prepare(); } } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } mMediaPlayer.start(); } private void StopAlarmRing() { mMediaPlayer.stop(); }}要注意的是Mainifest.xml：
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.chiefcto.Alarm" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="7" /> <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> <service android:name=".AlarmService"> <intent-filter> <action android:name="chief_musicService"/> <category android:name="android.intent.category.DEFAULT"/> </intent-filter> </service> <receiver android:name=".AlermReceiver" android:process=":remote"/> </application> <uses-permission android:name="android.permission.MOUT_UNMOUNT_FILESYSTEMS"/></manifest>
注：在模擬器中是運行不了的~
PS：關于AndroidManifest.xml文件相關屬性功能可參考本站在線工具：
Android Manifest功能與權限描述大全：
http://tools.VeVB.COm/table/AndroidManifest
更多關于Android相關內容感興趣的讀者可查看本站專題：《Android開發入門與進階教程》、《Android調試技巧與常見問題解決方法匯總》、《Android基本組件用法總結》、《Android視圖View技巧總結》、《Android布局layout技巧總結》及《Android控件用法總結》
希望本文所述對大家Android程序設計有所幫助。
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