背景知识:当Android启动时,会发出一个系统广播,内容为ACTION_BOOT_COMPLETED,它的字符串常量表示为android.intent.action.BOOT_COMPLETED。只要在程序中“捕捉”到这个消息,再启动之即可。记住,Android框架说:Don't call me, I'll call you back。我们要做的是做好接收这个消息的准备,而实现的手段就是实现一个BroadcastReceiver。

代码解析:

1、界面Activity:SayHello.java
package com.ghstudio.BootStartDemo;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.widget.TextView;  
  
public class SayHello extends Activity {  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
  
  
        TextView tv = new TextView(this);  
        tv.setText("Hello. I started!");  
  
  
        setContentView(tv);  
    }  
}  
这段代码很简单,当Activity启动时,创建一个TextView,用它显示"Hello. I started!"字样。

2、接收广播消息:BootBroadcastReceiver.java
package com.ghstudio.BootStartDemo;  
  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
  
public class BootBroadcastReceiver extends BroadcastReceiver {  
  
 static final String ACTION = "android.intent.action.BOOT_COMPLETED";  
   
 @Override  
 public void onReceive(Context context, Intent intent) {  
    
  if (intent.getAction().equals(ACTION)){  
   Intent sayHelloIntent=new Intent(context,SayHello.class);  
   sayHelloIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
  
   context.startActivity(sayHelloIntent);  
  }  
 }  
  
}  
该类派生自BroadcastReceiver,覆载方法onReceive中,检测接收到的Intent是否符合BOOT_COMPLETED,如果符合,则启动SayHello那个Activity。

3、配置文件:AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
      package="com.ghstudio.BootStartDemo"  
      android:versionCode="1"  
      android:versionName="1.0">  
    <application android:icon="@drawable/icon" android:label="@string/app_name">  
        <activity android:name=".SayHello"  
                  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=".BootBroadcastReceiver">  
  <intent-filter>  
    <action android:name="android.intent.action.BOOT_COMPLETED" />  
   </intent-filter>  
  </receiver>  
    </application>  
    <uses-sdk android:minSdkVersion="3" />  
  
   <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>  
  
</manifest>   
注意其中粗体字那一部分,该节点向系统注册了一个receiver,子节点intent-filter表示接收 android.intent.action.BOOT_COMPLETED消息。不要忘记配置 android.permission.RECEIVE_BOOT_COMPLETED权限。

 


===========================================

1.要做的就是监听系统发出的broadcast

 

public class FlorenceText extends BroadcastReceiver{

        public void onReceive(Context context, Intent intent) {
                if(Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())){
                        start(context);

                }

       }

}

2.在AndroidMenifest.xml里还要将receiver加上, 并写明程序的入口就是FlorenceTest

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <receiver android:name=".main.FlorenceTest"
                android:exported="true"
                android:process=":remote">

            <intent-filter >
                        <action android:name="android.intent.action.BOOT_COMPLETED" />
                        <category android:name="android.intent.category.HOME"/>
            </intent-filter>
        </receiver>

  </application>

这样,程序就可以在开机时自动运行了

转自:http://blog.csdn.net/wh_19910525/article/details/7921685

 

posted on 2014-10-09 15:50  Y.G.H  阅读(170)  评论(0编辑  收藏  举报