android registerreceiver() 参数,android – 如何使用registerReceiver方法？

我想使用动态注册的BroadcastReceiver有一个Activity的引用，所以它可以修改其UI。我使用Context.registerReceiver()方法，但接收器的onReceive()方法从未调用。

这里是显示问题的示例代码：

package com.example;

import android.app.Activity;

import android.app.IntentService;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.util.Log;

import android.view.KeyEvent;

public class RegisterBroadcastReceiver extends Activity {

public static class MyIntentService extends IntentService {

public MyIntentService() {

super(MyIntentService.class.getSimpleName());

}

@Override

protected void onHandleIntent(Intent intent) {

Intent i = new Intent(this, MyBroadcastReceiver.class);

sendBroadcast(i);

}

}

public class MyBroadcastReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

Log.i(MyBroadcastReceiver.class.getSimpleName(),

“received broadcast”);

}

}

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

MyBroadcastReceiver mReceiver = new MyBroadcastReceiver();

@Override

protected void onResume() {

super.onResume();

IntentFilter intentFilter = new IntentFilter();

registerReceiver(mReceiver, intentFilter);

}

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_MENU) {

Intent i = new Intent(this, MyIntentService.class);

startService(i);

}

return super.onKeyDown(keyCode, event);

}

@Override

protected void onPause() {

super.onPause();

unregisterReceiver(mReceiver);

}

}