Android开发——四大组件BroadcastReceiver实例广播事件的拦截转发

  我们通过一个实例来认识一下BroadcastReceiver广播接收器。我们两个广播接收器我们用不同的方式去注册，然后设置一个优先级，第一个广播优先级更高，让第一个广播事件给第二个增加一些内容。

在manifest中注册并设置第一个广播的优先级为最高（-1000~1000，1000为最高）

<receiver android:name="com.example.broadcastreceiver.firstBroadReveiver">
<intent-filter
android:priority="1000">
<action android:name="briup"/>
</intent-filter>
</receiver>activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.broadcastreceiver.MainActivity" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btn"/>
</RelativeLayout>
MainActivity.java
package com.example.broadcastreceiver;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends Activity {
private SecandBroadReveiver secandBroadReveiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
secandBroadReveiver=new SecandBroadReveiver();
IntentFilter filter=new IntentFilter();
filter.addAction("briup");
registerReceiver(secandBroadReveiver,filter);
}
public void btn(View view) {
// TODO Auto-generated method stub
Intent intent=new Intent();
intent.setAction("briup");
intent.putExtra("data", "原来的广播");
sendOrderedBroadcast(intent, null);
//sendBroadcast(intent);
}
}
firstBroadcastReceiver.java
package com.example.broadcastreceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
public class firstBroadReveiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String data=intent.getStringExtra("data");
Toast.makeText(context, "我是firstBroadReveiver "+data, Toast.LENGTH_LONG).show();
//截断广播
//abortBroadcast();
Bundle bundle=new Bundle();
bundle.putString("data1", " 增加这句话");
setResultExtras(bundle);
}
}
SecandBroadcastReceiver.java
package com.example.broadcastreceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
public class SecandBroadReveiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String data=intent.getStringExtra("data");
Bundle bundle=getResultExtras(false);
String data1 =bundle.getString("data1");
Toast.makeText(context, "我是SecandBroadReveiver"+data+data1, Toast.LENGTH_LONG).show();
}

}