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：

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;
  
  @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：

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：

Android Manifest功能与权限描述大全：
http://tools.jb51.net/table/AndroidManifest

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。