BroadcastReceiver与LocalBroadcastManager应用及区别
android中有两种广播机制，一种是BroadcastReceiver，另一种是LocalBroadcastManager。现在来简单介绍一下两者。
一、应用场景
1、BroadcastReceiver用于应用之间的传递消息；
2、而LocalBroadcastManager用于应用内部传递消息，比broadcastReceiver更加高效。
二、安全
1、BroadcastReceiver使用的Content API，所以本质上它是跨应用的，所以在使用它时必须要考虑到不要被别的应用滥用；
2、LocalBroadcastManager不需要考虑安全问题，因为它只在应用内部有效。
BroadcastReceiver的使用
private MyBroadcastReceiver myBroadcastReceiver;
//实例化广播
myBroadcastReceiver=new MyBroadcastReceiver();
//注册广播
registerReceiver(myBroadcastReceiver,new IntentFilter(ACTION));
//发送广播
Intent intent = new Intent();
intent.setAction(ACTION);
intent.putExtra(NAME,"Andy");
sendBroadcast(intent);
//广播接收器
public static class MyBroadcastReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
String name=intent.getStringExtra(NAME); Toast.makeText(context,name+":"+flag,Toast.LENGTH_SHORT).show();
++flag;
}
}
//销毁
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(myBroadcastReceiver);
}
LocalBroadcastManager的使用
private LocalBroadcastManager mLocalBroadcastManager;
private BroadcastReceiver mBroadcastReceiver;
//实例化
mLocalBroadcastManager=LocalBroadcastManager.getInstance(this);
//过滤器
IntentFilter intentFilter=new IntentFilter();
intentFilter.addAction(ACTION_STARTED);
//广播接收器
mBroadcastReceiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(ACTION_STARTED)) {
tv.setText("STARTED");
}
}
};
//注册广播
mLocalBroadcastManager.registerReceiver(mBroadcastReceiver,intentFilter);
//发送广播
mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STARTED));
//销毁
@Override
protected void onDestroy() {
super.onDestroy();
mLocalBroadcastManager.unregisterReceiver(mBroadcastReceiver);
}
