常见问题2016/08/25

【APP开发】android 之service实现电话监听并录音

要实现电话监听，需要监听电话的状态，方法如下.

ListenReceiver类: 收到电话广播时开启监听电话的服务

public class ListenReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) {
context.startService(new Intent(context,ListenService.class));//收到广播时开启监听电话的服务
}
}

ListenService类: 监听电话呼叫的状态，并在对应的状态进行响应的处理:

public class ListenService extends Service {

public IBinder onBind(Intent intent) {
return null;
}

public void onCreate() {
    System.out.println(“开始监听电话服务状态”);
    //获得电话管理器
    TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
    //为管理器设置监听器,监听电话的呼叫状态
    manager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);
}

private class MyPhoneListener extends PhoneStateListener{
    private String num;//记录来电号码
    private MediaRecorder mRecorder;
    public void onCallStateChanged(int state, String incomingNumber) {
        switch (state) {
        case TelephonyManager.CALL_STATE_RINGING://来电振动
            num = incomingNumber;
            break;
        case TelephonyManager.CALL_STATE_OFFHOOK:// 当接通电话开始通话时可以进行录音
            mRecorder = new MediaRecorder();
             mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //此处只实现了录本地MIC输入的声音,若想录入对立通话者的声音
             mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
             mRecorder.setOutputFile(“/mnt/sdcard/”+num+”_”+System.currentTimeMillis()+”.3gp”);
             mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
             try {
                mRecorder.prepare();
            } catch (Exception e) {
                e.printStackTrace();
            }
             mRecorder.start();

            break;
        case TelephonyManager.CALL_STATE_IDLE://挂断电话时停止录音
            if(mRecorder!=null){
            mRecorder.stop(); //停止
            mRecorder.release();//释放
            mRecorder=null;//垃圾回收
            }
            break;
        }
    }
}
}//监听电话的状态