Android编程实现闹钟的方法详解
本文实例讲述了Android编程实现闹钟的方法。分享给大家供大家参考，具体如下：
在Android中，有一个闹钟的类，AlarmManager类，我们可以通过其来对系统内的通知进行操作！
本文用到了Service和Broadcast两个后台管理，在处理时，曾出现过很多问题，但经过半天的努力，终于解决了！
首先是Main.xml文件：
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns: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:
packagecom.chiefcto.Alarm;
importjava.text.Format;
importjava.util.Calendar;
importandroid.app.Activity;
importandroid.app.AlarmManager;
importandroid.app.PendingIntent;
importandroid.app.TimePickerDialog;
importandroid.content.Intent;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.TextView;
importandroid.widget.TimePicker;
publicclassMainActivityextendsActivity{
//Properties
privateButtonmsetButton;
privateButtonmcancelButton;
privateAlermReceiveruIReceiver;
privateTextViewmTextView;
//就用了Java的日历
privateCalendarcalendar;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
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(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
calendar.setTimeInMillis(System.currentTimeMillis());
inthour=calendar.get(Calendar.HOUR_OF_DAY);
intminute=calendar.get(Calendar.MINUTE);
newTimePickerDialog(MainActivity.this,newTimePickerDialog.OnTimeSetListener(){
@Override
publicvoidonTimeSet(TimePickerview,inthourOfDay,intminute){
calendar.setTimeInMillis(System.currentTimeMillis());
//set(f,value)changesfieldftovalue.
calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
calendar.set(Calendar.MINUTE,minute);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
Intentintent=newIntent(MainActivity.this,AlermReceiver.class);
intent.putExtra("music",true);
PendingIntentpendingIntent=PendingIntent.getBroadcast(MainActivity.this,0,intent,0);
AlarmManageram;
//获取系统进程
am=(AlarmManager)getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingIntent);
//设置周期！！
am.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+(10*1000),(24*60*60*1000),pendingIntent);
Stringtmps="设置闹钟时间为："+format(hourOfDay)+":"+format(minute);
mTextView.setText(tmps);
}
},hour,minute,true).show();
}
});
mcancelButton.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
Intentintent=newIntent(MainActivity.this,AlermReceiver.class);
intent.putExtra("music",true);
PendingIntentpendingIntent=PendingIntent.getBroadcast(MainActivity.this,0,intent,0);
AlarmManageram;
//获取系统进程
am=(AlarmManager)getSystemService(ALARM_SERVICE);
//cancel
am.cancel(pendingIntent);
mTextView.setText("取消了！");
}
});
}
privateStringformat(intx){
Strings=""+x;
if(s.length()==1)
s="0"+s;
returns;
}
}
AlarmService.java
packagecom.chiefcto.Alarm;
importjava.io.IOException;
importandroid.app.Service;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.media.AudioManager;
importandroid.media.MediaPlayer;
importandroid.media.RingtoneManager;
importandroid.net.Uri;
importandroid.os.Binder;
importandroid.os.Bundle;
importandroid.os.IBinder;
publicclassAlarmServiceextendsService{
//MediaPlayer实例
privateMediaPlayerplayer;
//IBinder实例
@Override
publicIBinderonBind(Intentintent){
playMusic();
returnnull;
}
@Override
publicvoidonCreate(){
//TODOAuto-generatedmethodstub
super.onCreate();
playMusic();
}
@Override
publicvoidonDestroy(){
//TODOAuto-generatedmethodstub
super.onDestroy();
if(player!=null){
player.stop();
player.release();
}
}
@Override
publicvoidonStart(Intentintent,intstartId){
//TODOAuto-generatedmethodstub
super.onStart(intent,startId);
if(intent!=null){
Bundlebundle=intent.getExtras();
if(bundle!=null){
if(bundle.getBoolean("music"))
playMusic();
else
stopMusic();
}
}
}
publicvoidplayMusic(){
if(player==null){
Uriuri=RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
try{
player=newMediaPlayer();
player.setDataSource(this,uri);
finalAudioManageraudioManager=(AudioManager)this
.getSystemService(Context.AUDIO_SERVICE);
if(audioManager.getStreamVolume(AudioManager.STREAM_ALARM)!=0){
player.setAudioStreamType(AudioManager.STREAM_ALARM);
player.setLooping(true);
player.prepare();
}
}catch(IllegalStateExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
if(!player.isPlaying()){
player.start();
}
}
publicvoidstopMusic(){
if(player!=null){
player.stop();
try{
//在调用stop后如果需要再次通过start进行播放,需要之前调用prepare函数
player.prepare();
}catch(IOExceptionex){
ex.printStackTrace();
}
}
}
}
下面就是本文的关键性代码，了解Activity到Broadcast的机制，这小应用就很好实现了~
AlermReceiver.java
packagecom.chiefcto.Alarm;
importjava.io.IOException;
importjava.util.Calendar;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.media.AudioManager;
importandroid.media.MediaPlayer;
importandroid.media.RingtoneManager;
importandroid.net.Uri;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.widget.Toast;
publicclassAlermReceiverextendsBroadcastReceiver{
privateMediaPlayermMediaPlayer;
Contextcontext;
@Override
publicvoidonReceive(Contextcontext,Intentintent){
//TODOAuto-generatedmethodstub
Calendarcalendar=Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
intminute=calendar.get(Calendar.MINUTE);
CharSequencetext=String.valueOf(minute);
Toast.makeText(context,text,Toast.LENGTH_LONG).show();
this.context=context;
Bundlebundle=intent.getExtras();
IntentserviceIntent=newIntent("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);
}
//在这里是播放不了的！！
//playAlarmRing();
}
privatevoidplayAlarmRing(){
Uriuri=RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
try{
mMediaPlayer=newMediaPlayer();
mMediaPlayer.setDataSource(context,uri);
finalAudioManageraudioManager=(AudioManager)context
.getSystemService(Context.AUDIO_SERVICE);
if(audioManager.getStreamVolume(AudioManager.STREAM_ALARM)!=0){
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
mMediaPlayer.setLooping(true);
mMediaPlayer.prepare();
}
}catch(IllegalStateExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
mMediaPlayer.start();
}
privatevoidStopAlarmRing(){
mMediaPlayer.stop();
}
}
要注意的是Mainifest.xml：
<?xmlversion="1.0"encoding="utf-8"?> <manifestxmlns:android="http://schemas.android.com/apk/res/android" package="com.chiefcto.Alarm" android:versionCode="1" android:versionName="1.0"> <uses-sdkandroid:minSdkVersion="7"/> <applicationandroid:icon="@drawable/icon"android:label="@string/app_name"> <activityandroid:name=".MainActivity" android:label="@string/app_name"> <intent-filter> <actionandroid:name="android.intent.action.MAIN"/> <categoryandroid:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <serviceandroid:name=".AlarmService"> <intent-filter> <actionandroid:name="chief_musicService"/> <categoryandroid:name="android.intent.category.DEFAULT"/> </intent-filter> </service> <receiverandroid:name=".AlermReceiver"android:process=":remote"/> </application> <uses-permissionandroid:name="android.permission.MOUT_UNMOUNT_FILESYSTEMS"/> </manifest>
注：在模拟器中是运行不了的~
PS：关于AndroidManifest.xml文件相关属性功能可参考本站在线工具：
AndroidManifest功能与权限描述大全：
http://tools.jb51.net/table/AndroidManifest
希望本文所述对大家Android程序设计有所帮助。