android - 如何在 Activity 中显示充电器是否已插入/拔出？

Question

我是安卓新手。如果插入或拔出充电器，我想更改 Activity 中 TextView 的文本。为此，我已经在 list 中注册了一个带有 Intent 的接收器 android.intent.action.ACTION_POWER_CONNECTED android.intent.action.ACTION_POWER_DISCONNECTED

以下是接收器的代码:

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

    if(intent.getAction() == Intent.ACTION_POWER_CONNECTED) {
        //Handle power connected
        Log.e("Charger State","power connected");
        Toast.makeText(context, "Charger PluggedIn", Toast.LENGTH_SHORT).show();
    } else if(intent.getAction() == Intent.ACTION_POWER_DISCONNECTED){
        //Handle power disconnected
        Log.e("Charger State","power disconnected");
        Toast.makeText(context, "Charger PluggedOut", Toast.LENGTH_SHORT).show();
    }

   }
}

这工作正常，但我想在插入或拔出充电器时在 Activity 中显示它。请帮助我完成任务。

谢谢~

Answer 1

有很多方法可以将数据从广播接收器传递到 Activity

最好的方法是乘坐巴士

compile 'org.greenrobot:eventbus:3.0.0'

//Some Class
public class MessageEvent {
   public final String message;

public MessageEvent(String message) {
    this.message = message;
   }
}

//In Activity
@Override
  public void onStart() {
  super.onStart();
  EventBus.getDefault().register(this);
}

@Override
 public void onStop() {
 EventBus.getDefault().unregister(this);
 super.onStop();
}

//From Broadcast Receiver
//Add this in the Connected and Disconnected methods 
EventBus.getDefault().post(new MessageEvent("Hello everyone!"));