拦截有序广播

一.创建布局文件

代码如下：

<?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="bzu.edu.cn.orderbroadcast.MainActivity">


    <Button
        android:text="发送有序广播"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="84dp"
        android:onClick="click"
        android:id="@+id/button" />
</RelativeLayout>

二添加广播接受者

添加三个不同的广播接收者MyReceiver1，MyReceiver2，MyReceiver3.不同的广播接收者打印不同的提示信息，代码如下：

package bzu.edu.cn.orderbroadcast;

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

public class MyReceiver1 extends BroadcastReceiver {
    public MyReceiver1() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyReceiver1","自定义广播接受者01，接收到了自定义的广播事件");
    }
}

package bzu.edu.cn.orderbroadcast;

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

public class MyReceiver2 extends BroadcastReceiver {
    public MyReceiver2() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyReceiver2","自定义广播接受者02，接收到了自定义的广播事件");
    }
}

package bzu.edu.cn.orderbroadcast;

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

public class MyReceiver3 extends BroadcastReceiver {
    public MyReceiver3() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyReceiver3","自定义广播接受者03，接收到了自定义的广播事件");
    }
}

三编写界面交互代码

如下：

package bzu.edu.cn.orderbroadcast;

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 click(View view){
        Intent intent=new Intent();

//定义广播的事件类型

        intent.setAction("lanjie");

//发送有序广播

       sendOrderedBroadcast(intent,null);
    }
}

四在清单文件中的设置

如下：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="bzu.edu.cn.orderbroadcast">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name=".MyReceiver1"
            android:enabled="true"
            android:exported="true">
            <intent-filter android:priority="1000">

                <action android:name="lanjie" />
            </intent-filter>
        </receiver>
        <receiver
            android:name=".MyReceiver2"
            android:enabled="true"
            android:exported="true" >
            <intent-filter android:priority="200">
                <action android:name="lanjie"></action>
            </intent-filter>
            </receiver>
        <receiver
            android:name=".MyReceiver3"
            android:enabled="true"
            android:exported="true">
            <intent-filter android:priority="600">
                <action android:name="lanjie"></action>
            </intent-filter>
        </receiver>
    </application>

</manifest>

其中android:priority=“”是优先级，范围是-1000——1000之间，数值越大，表明优先级越高，程序就会先执行，另外，<intent-filter>
                <action android:name="lanjie"></action>
            </intent-filter>中name属性必须一致，否则程序无用！！

五打印信息如下