Broadcastreceiver创建多个TelephonyManager实例

Question

这是我的BroadcastReceiver

public class PlayAudio extends BroadcastReceiver {
 
    @Override
    public void onReceive(Context context, Intent intent) {

        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        tm.listen(new CustomPhoneStateListener(context), PhoneStateListener.LISTEN_CALL_STATE);
    }
}

这是我的自定义PhoneStateListener类

public class CustomPhoneStateListener extends PhoneStateListener {

    Context context; 
    
    public CustomPhoneStateListener(Context context) {
        super();
        this.context = context;
    }
    
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        super.onCallStateChanged(state, incomingNumber);

        switch (state) {
        case TelephonyManager.CALL_STATE_IDLE:
            Log.d("PHONEA", "IDLE");
            break;
        case TelephonyManager.CALL_STATE_OFFHOOK:
           Log.d("PHONEA", "OFFHOOK");
            break;
        case TelephonyManager.CALL_STATE_RINGING:
            Log.d("PHONEA", "RINGING");
            Intent intent = new Intent(this.context, AudioService.class);
            context.startService(intent);
            break;
        default:
            break;
        }
    }
}

这是我的服务

public class AudioService extends Service{
    private static final String TAG = "PHONEA";
    MediaPlayer player;
    
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    
    @Override
    public void onCreate() {
        Log.d(TAG, "onCreate -> TODO");
        }
}

我的问题是，每次我在Broadcast receiver中接收数据时，我都会创建一个新的TelephonyManager实例。因此，当我查看logcat时，第一次收到“view”，第二次收到“view”，以此类推。为了只有一个实例，我应该在什么时候创建telephonylistener？

你好，尼科斯

Answer 1

每次电话状态改变时，您的接收器上都会有呼叫(假设您正在监听PhoneState)。

你应该检查你的接收器，并且只在第一次安装TelephonyManager。