广播接收者——案例：拦截有序广播

本次案例介绍的是有序广播，有序广播是在广播发出之后，广播接收器会按照顺序接受广播消息，不能同时接受，相对于无序广播来说，无序广播是异步执行，效率高，但是无法拦截，有序广播虽然没有无序广播的效率高，但是可以拦截，实用效果大于无序广播。

下面是本次案例的代码：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
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.bz0209.bryouxu.MainActivity"
android:background="@drawable/stitch_one">

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送有序广播"
android:textSize="18sp"
android:layout_centerHorizontal="true"
android:layout_marginTop="80dp"
android:background="#FBFBFF"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:onClick="send"/>

</RelativeLayout>

MainActivity:
package com.example.bz0209.bryouxu;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void send(View view){
Intent intent=new Intent();
intent.setAction("Intercept_stitch");
sendOrderedBroadcast(intent,null);
}
}
MyBroadcastReceiverOne
package com.example.bz0209.bryouxu;

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

/**
* Created by Administrator on 2017/6/5.
*/

public class MyBroadcastReceiverOne extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
Log.i("MyBroadcastReceiverOne","自定义的广播接受者One，接受到广播事件");
}
}
MyBroadcastReceiverTwo
package com.example.bz0209.bryouxu;

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

/**
* Created by Administrator on 2017/6/5.
*/

public class MyBroadcastReceiverTwo extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("MyBroadcastReceivertwo","自定义的广播接受者two，接受到广播事件");
}
}


MyBroadcastReceiverThree
package com.example.bz0209.bryouxu;

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

/**
* Created by Administrator on 2017/6/5.
*/

public class MyBroadcastReceiverThree extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("MyBroadcastReceiverThree","自定义的广播接受者Therr，接受到广播事件");
}
}
下面是效果图



运行之后会在控制台打印出广播接收者的顺序。