Android BroadcastReceiver实例Demo（有序广播的发送）

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mb5fd869d1d8388 2014-10-18 19:32:00

文章标签 android xml ide 有序广播 bundle 文章分类 代码人生

上一篇简介了广播的发送，这篇主要介绍下，有序广播的发送。

设置完相关属性的时候，广播就会依照有序的方式进行发送：

发送顺序：

先发送第二条广播；

再发送第一条广播；

最后发送第三条广播。

代码例如以下：

Android BroadcastReceiver实例Demo（有序广播的发送）_ide

布局文件：

activity_main(一个Button)：

<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=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="点击发送有序广播" />

</RelativeLayout>

MainActivity：

package com.android_broadcasereceiverdemo2;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
  private Button button;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    button = (Button) findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        Intent intent = new Intent();
        intent.setAction("myaction");
        intent.putExtra("name", "梅西");
        sendOrderedBroadcast(intent, null);
      }
    });
  }
}

FirstBroadcast：

package com.android_broadcasereceiverdemo2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class FirstBroadcast extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {

    String name = intent.getStringExtra("name");
    Toast.makeText(context, "第一条广播已发送..."+name, Toast.LENGTH_SHORT).show();
//    abortBroadcast();//当加上这条代码的时候，广播发送到此结束，即第三条广播不会再收到。
  }

}

SecondBroadcast：

package com.android_broadcasereceiverdemo2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class SecondBroadcast extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {

    String name = intent.getStringExtra("name");
    Toast.makeText(context, "第二条广播已发送..."+name, Toast.LENGTH_SHORT).show();
  }

}

ThirdBroadcast：

package com.android_broadcasereceiverdemo2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class ThirdBroadcast extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {

    String name = intent.getStringExtra("name");
    Toast.makeText(context, "第三条广播已发送..."+name, Toast.LENGTH_SHORT).show();
  }

}

AndroidManifest.xml(非常关键)：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android_broadcasereceiverdemo2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.android_broadcasereceiverdemo2.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <receiver android:name=".FirstBroadcast" >
            <!-- 有序广播中，priority数值越大，优先级越大，也就越先发送！！ -->
            <intent-filter android:priority="99">
                <action android:name="myaction" />
            </intent-filter>
        </receiver>

        <receiver android:name=".SecondBroadcast" >
            <intent-filter android:priority="100">
                <action android:name="myaction" />
            </intent-filter>
        </receiver>

        <receiver android:name=".ThirdBroadcast" >
            <intent-filter android:priority="98">
                <action android:name="myaction" />
            </intent-filter>
        </receiver>
    </application>

</manifest>