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：

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/mText"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"

/>

android:id="@+id/setTimeButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/setTimeButton"

/>

android:id="@+id/cancelButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/cancelButton"

/>

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的日历

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;

//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);

String tmps = "设置闹钟时间为："+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;

//获取系统进程

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实例

private MediaPlayer player;

// IBinder实例

@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 (IOException ex) {

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

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);

}

//在这里是播放不了的！！

//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：

package="com.chiefcto.Alarm"

android:versionCode="1"

android:versionName="1.0">

android:label="@string/app_name">

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：

希望本文所述对大家Android程序设计有所帮助。