案例--拦截有序广播

1.创建一个名字为“拦截有序广播”的应用程序相应的布局文件（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>

上述布局文件定义了一个Button按钮并为按钮注册了一个send事件，当按钮被触发时会发送一条有序广播

2.MainActivity代码如下：

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();        //定义广播类型        intent.setAction("Intercept_stitch");        //发送有序广播        sendOrderedBroadcast(intent,null);    }}

上述代码中sendOrderedBroadcast(intent,null);用于发送一个有序广播，在该方法中接受两个参数，第一个是指定的意图，第二个指定接受者权限，如果不想让所有的接受者看到，可以显示的指定接受者的权限。
3.添加三个广播接受者
（1）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");    }}

（2.）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");    }}

（3.）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");    }}

4.清单文件：AndroidManifest

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.bz0209.bryouxu">    <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=".MyBroadcastReceiverOne">            <intent-filter android:priority="1000">                <action android:name="Intercept_stitch"/>            </intent-filter>        </receiver>        <receiver android:name=".MyBroadcastReceivertwo">            <intent-filter android:priority="200">                <action android:name="Intercept_stitch"/>            </intent-filter>        </receiver>        <receiver android:name=".MyBroadcastReceiverThree">            <intent-filter android:priority="100">                <action android:name="Intercept_stitch"/>            </intent-filter>        </receiver>    </application></manifest>

三个广播接受者的优先级是：MyBroadcastReceiverOne、MyBroadcastReceivertwo、MyBroadcastReceiverThree；需要注意的是在优先级不同时按照优先级进行接受，优先级相同的则看在清单文件的先后顺序。

注意：自从安卓更新了版本，下安卓6.0以上的版本需要获取运行时权限，6.0以下的版本不需要，平时检测代码可以采用4.4的版本。