Question

我的广播接收器和发件人在这里搞砸了。也许另一组眼睛会很有用。

我有我的lightsensor，它应该广播接收活动的变化。

这是LightSensor.java

public void onSensorChanged(SensorEvent event) {
    lightLux = event.values[0]; //Final output of this sensor.
    Lux = String.valueOf(lightLux);
    sendLuxUpdate();

    Log.d("LightSensor", Lux);
    TextView tvLightSensorLux = (TextView) findViewById(R.id.tvLightSensorLux);
    tvLightSensorLux.setText(Lux);
}

private void sendLuxUpdate() {
      Log.d("sender", "Broadcasting message");
      Intent intent = new Intent("LuxUpdate");
      // You can also include some extra data.
      intent.putExtra("Lux", lightLux);
      LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }

然后我的Record.java被用来接收勒克斯的那些更新：

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_record);


    LocalBroadcastManager.getInstance(this).registerReceiver(mLightReceiver,
              new IntentFilter("LuxUpdate"));
}

private BroadcastReceiver mLightReceiver = new BroadcastReceiver() {

@Override
public void onReceive(Context context, Intent intent) {
     // Get extra data included in the Intent
    String lux = intent.getStringExtra("Lux");
    Log.d("Light Lux", "Lux Update: " + lux);
    TextView tvSensorLightLux = (TextView) findViewById(R.id.tvSensorLightLux);
    tvSensorLightLux.setText(lux);
}
};

@Override
protected void onDestroy() {
  // Unregister since the activity is about to be closed.
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mLightReceiver);
  super.onDestroy();
}

我认为这只是发送和接收ID的问题，但我不完全确定。一旦Record活动收到广播，它应该更新TextView tvSensorLightLux或至少Log.d来自LightSensor.java的Lux值

Answer 1

你正在传递Float并使用你正在使用的接收器，

String lux = intent.getStringExtra("Lux");

需要"Lux"为String。

当你传递Float时。在接收器中只需添加getFloatExtra()

lux =intent.getFloatExtra("Lux", defaultValue);

输入您想要的默认值，比如0

向后BroadcastReceiver发件人

1 个答案: