我有两个活动在进行。首先启动活动A,然后启动活动B(即堆栈中的A,焦点中的B)。我在两个活动中都有跑步。问题是只有活动A能够捕获我的广播消息(使用BroadcastReceiver
为什么会这样?如何使两个活动都能在不终止的情况下接收广播(在活动a上调用sendBroadcast
另外,在活动a中是否有任何方法可以重用广播接收器方法?
广播活动

Intent intent = new Intent(MESSAGE_UPDATE);
intent.putExtra("message", message);
sendBroadcast(intent);

活动A
@Override
public void onResume() {
    super.onResume();
    if(resumeHasRun==false){
    IntentFilter movementFilter;
    movementFilter = new IntentFilter();

    movementFilter.addAction(NewService.MESSAGE_UPDATE);

    registerReceiver(mIntentReceiver, movementFilter);
    resumeHasRun=true;
    return;
    }
}
public BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getStringExtra("message");
                    updateTable(message);


    }
};

@Override
protected void onDestroy() {
    super.onDestroy();
  unregisterReceiver(mIntentReceiver);
}

public void startNewActivity(){
    Intent newIntent = new Intent(getApplicationContext(),ActivityB.class);
    startActivity(newIntent);
    //never call finish
}

活动B
@Override
public void onResume() {
    super.onResume();
    if(resumeHasRun==false){
    IntentFilter movementFilter;
    movementFilter = new IntentFilter();

    movementFilter.addAction(NewService.MESSAGE_UPDATE);

    registerReceiver(mIntentReceiver, movementFilter);
    resumeHasRun=true;
    return;
    }
}
public BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getStringExtra("message");
                    updateAnotherTable(message);


    }
};
@Override
protected void onDestroy() {
    super.onDestroy();
  unregisterReceiver(mIntentReceiver);
}

最佳答案

移动:

registerReceiver(mIntentReceiver, movementFilter); to onStart()
unregisterReceiver(mIntentReceiver); to onStop()

制作(在自己的文件中):
public class TableUpdateReceiver extends BroadcastReceiver {
    public interface Listener {
       public void tableUpdate(String message);
    };
    Listener mListener;

    public TableUpdateReceiver(Listener list) {
         mListener = list;
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        String message = intent.getStringExtra("message");
        if(mListener != null) {
            mListener.tableUpdate(message);
        }
    }
};

使您的活动实现TableUpdateReceiver.Listener和:
public BroadcastReceiver mIntentReceiver;
onCreate(Bundle savedState) {
   ...
   mIntentReceiver = new TableUpdateReceiver(this);
   ...
}

public void tableUpdate(String message) {
   //do something
}

09-10 06:14
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