Android编程之利用服务实现电话监听的方法

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package cn.class3g.phonelistener;
...
public class PhoneListenerService extends Service {
public IBinder onBind(Intent arg0) {
 return null;
 }
 public void onCreate() {
 super.onCreate();
 Log.i("TAG", "服务启动了");
 // 对电话的来电状态进行监听
TelephonyManager telManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
 // 注册一个监听器对电话状态进行监听
telManager.listen(new MyPhoneStateListener(),
 PhoneStateListener.LISTEN_CALL_STATE);
 } 
 private class MyPhoneStateListener extends PhoneStateListener {
 MediaRecorder recorder; 
 File audioFile; 
 String phoneNumber; 
 public void onCallStateChanged(int state, String incomingNumber) {
 switch (state) { 
 case TelephonyManager.CALL_STATE_IDLE: /* 无任何状态时 */
if (recorder != null) { 
 recorder.stop();// 停止刻录 
recorder.reset();// 重设 
recorder.release();// 刻录完成一定要释放资源 
} 
break; 
 case TelephonyManager.CALL_STATE_OFFHOOK: /* 接起电话时 */
try { 
 recorder = new MediaRecorder(); 
 recorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 设置音频采集原
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// 内容输出格式
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); // 音频编码方式
// recorder.setOutputFile("/sdcard/myvoice.amr"); 
 audioFile = new File( 
 Environment.getExternalStorageDirectory(), 
 phoneNumber + "_" + System.currentTimeMillis() 
 + ".3gp"); 
 recorder.setOutputFile(audioFile.getAbsolutePath());
 Log.i("TAG", audioFile.getAbsolutePath()); 
 recorder.prepare(); // 预期准备 
recorder.start(); 
 } catch (IllegalStateException e) { 
 e.printStackTrace(); 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 break; 
 case TelephonyManager.CALL_STATE_RINGING: /* 电话进来时 */
phOneNumber= incomingNumber; 
 break; 
 default: 
 break; 
 } 
 super.onCallStateChanged(state, incomingNumber); 
 } 
 } 
}

package cn.class3g.phonelistener; 
... 
public class BootBroadcastReceiver extends BroadcastReceiver { 
 public void onReceive(Context context, Intent intent) { 
 Log.i("TAG", "广播被接收了"); 
Intent serviceIntent = new Intent(context, PhoneListenerService.class); 
 context.startService(serviceIntent); 
 } 
}