BroadcastReceiver的两种注册方法

/* 1.静态注册先在androidanifest receiver里面注册reiver
2.在intent事先写入启动广播Intent intent=new Intent(MainActivity.this, MyReceiver.class);
3.广播信息，intent.putExtra("name","hello");
4.sendBroadcast(intent)启动广播 */

public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

findViewById(R.id.btnsendbroad).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

Intent intent=new Intent(MainActivity.this, MyReceiver.class);
intent.putExtra("name", "linhong");
sendBroadcast(intent);
//静态注册,androidanifest receiver
}
});
}

}

声明一个类继承BroadcastReceiver,在重写onReceiver()方法

/*  1. 在Android中，Broadcast是一种广泛运用的在应用程序之间传输信息的机制。而BroadcastReceiver是对发送出来的Broadcast进行过滤接受并响应的一类组件。
2. 所有已经注册的BroadcastReceiver会检查注册时的IntentFilter是否与发送的Intent相匹配，若匹配则就会调用BroadcastReceiver的onReceive()方法。
所以当我们定义一个BroadcastReceiver的时候，都需要实现onReceive()方法。 */

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyReceiver extends BroadcastReceiver {

public static final String action="com.example.broadcast.intent.action.MyReceiver";  //action定义："包名.intent.action.name";name随便
public void onReceive(Context context, Intent intent) {

System.out.println("onReceive..."+intent.getStringExtra("name"));

}
}

//动态注册广播

registerReceiver(BroadcastReceiver receiver, IntentFilterfilter)

第一个参数是我们要处理广播的BroadcastReceiver （广播接收者，可以是系统的，也可以是自定义的）,第二个参数是意图过滤器。

public class MainActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btnRegisterbroadcast).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

registerReceiver(receiver, new IntentFilter(MyReceiver.action));//注册到那个广播
}
});
findViewById(R.id.btnunRegisterbroadcast).setOnClickListener(new OnClickListener() {

public void onClick(View v) {

unregisterReceiver(receiver);//注销广播               }
});

findViewById(R.id.btnsendbroad).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

Intent intent=new Intent(MyReceiver.action);
intent.putExtra("name", "linhong_hello world");
sendBroadcast(intent);
/*
* 当动态创建时候，点击这个按钮没反应，因为
* 没有注册到androidmainfest，要动态注册
* registerReceiver注册到那个receiver上
* 点击Register broadcast,在点击send broacast才能发送
* 点击unRegister注销 broadcast，在点击send broadcast不能发送
*/

}
});
}
public    final MyReceiver receiver=new MyReceiver(); //dynamic register

}