Intent 广播 发送 接收

一、广播发送方

对Intent进行描述，可以使广播接收器更明确该如何进行广播的筛选。

Intent intent = new Intent(NEW_LIFEFORM_DETECTED);intent.putExtra("lifeformName", lifeformType);intent.putExtra("longitude", currentLongitude);intent.putExtra("latitude", currentLatitude);sendBroadcast(intent);

二、广播接收方

（1）实现广播接收器

扩展BroadcastReceiver类，并重写OnReceive方法。

import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { //TODO: React to the Intent received. }}

 

（2）注册广播接收器

方法1.在程序清单注册

<receiver android:name=".LifeformDetectedBroadcastReceiver"> <intent-filter> <action android:name="com.paad.action.NEW_LIFEFORM"/> </intent-filter></receiver>

方法2.在程序代码注册

// Create and register the broadcast receiver.IntentFilter filter = new IntentFilter(NEW_LIFEFORM_DETECTED);LifeformDetectedBroadcastReceiver r = new LifeformDetectedBroadcastReceiver();registerReceiver(r, filter);

要通过unregisterReceiver(receiver)来反注册。