在Android中实现广播，首先我们要在Manifest.xml文件中配置一个
另外一个比较重要的步骤是必须有一个类继承自BroadcastReceiver类，并复写onReceiver方法，在该方法中处理接收到广播后需要处理的事情！
下面来看一个具体的例子，有助于更好的理解广播机制是怎么一回事。
UI部分就不说了，Activity上就加了一个按钮，点击后发送广播。接收器接收到广播后在终端输出一句话。
首先看AndroidManifest.xml文件：
`
android:versionCode="1"
android:versionName="1.0">
android:label="@string/app_name">
`
下面是Activity：
`
package com.gufengxiachen.broadcast;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class BroadCast extends Activity {
/* Called when the activity is first created. /
private Button bound =null;
private Button unbound =null;
private Button sendBroadCast =null;
private SecondBroadCastReceiver sbr =null;
public static final String SMS_ACTION="android.provider.Telephony.SMS_RECEVIER";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bound = (Button)findViewById(R.id.bound);
unbound = (Button)findViewById(R.id.unbound);
sendBroadCast = (Button)findViewById(R.id.sendBroadCast);
bound.setOnClickListener(new BoundListener());
unbound.setOnClickListener(new UnboundListener());
sendBroadCast.setOnClickListener(new SendBroadCast());
}
class SendBroadCast implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_EDIT);
BroadCast.this.sendBroadcast(intent);
}
}
class BoundListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
sbr = new SecondBroadCastReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(SMS_ACTION);
BroadCast.this.registerReceiver(sbr, filter);
}
}
class UnboundListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
BroadCast.this.unregisterReceiver(sbr);
}
}
}
`
最后是接收器类：
`
package com.gufengxiachen.broadcast;
【【Android学习】Android广播机制】import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyBroadCastReceiver extends BroadcastReceiver{
public MyBroadCastReceiver(){
}
@Override
public void onReceive(Context context, Intent intent) {
System.out.println("message receiver");
}
}
