如何让Android开机启动程序

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。

1、界面Activity,BootStartDemo.java文件

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public class BootStartDemo extends Activity {      /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          // 无title          requestWindowFeature(Window.FEATURE_NO_TITLE);          // 全屏          getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                  WindowManager.LayoutParams.FLAG_FULLSCREEN);          setContentView(R.layout.main);          new Thread() {              public void run() {                  try {                       /*  8秒后关闭页面*/                      sleep( 10000 );                  } catch (Exception e) {                      e.printStackTrace();                  } finally {                      finish(); // 关闭页面                  }              }          }.start();         } }

这段代码很简单，当Activity 启动时，会显示TextView，用它显示你想显示的字样，并且这个页面只显示10秒后消失。

2、接收广播消息：BootBroadcastReceiver.java

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public class BootBroadcastReceiver extends BroadcastReceiver {      static final String action_boot= "android.intent.action.BOOT_COMPLETED" ;          @Override      public void onReceive(Context context, Intent intent) {          if (intent.getAction().equals(action_boot)){               Intent ootStartIntent= new Intent(context,BootStartDemo. class );               ootStartIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);               context.startActivity(ootStartIntent);           }         }    }

该类继续自 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BootStartDemo这个Activity。

3、配置文件

(1)AndroidManifest.xml ：

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<? xml version = "1.0" encoding = "utf-8" ?> <!-- 这是一个开机自启动程序 --> < manifest xmlns:android = "http://schemas.android.com/apk/res/android"        package = "com.ajie.bootstartdemo"        android:versionCode = "1"        android:versionName = "1.0" >      < application android:icon = "@drawable/icon" android:label = "@string/app_name" >          < activity android:name = ".BootStartDemo"                    android:label = "@string/app_name" >              < intent-filter >                  < action android:name = "android.intent.action.MAIN" />                  < category android:name = "android.intent.category.LAUNCHER" />              </ intent-filter >          </ activity >      < span style = "color: rgb(255, 0, 255);" >< receiver android:name = ".BootBroadcastReceiver" >           < intent-filter >           < action android:name = "android.intent.action.BOOT_COMPLETED" />           < category android:name = "android.intent.category.HOME" />          </ intent-filter >       </ receiver >  </ span >    </ application > < span style = "color: rgb(255, 0, 255);" >< strong >< uses-permission android:name = "android.permission.RECEIVE_BOOT_COMPLETED" ></ uses-permission ></ strong >  </ span ></ manifest >

注意其中颜色标红那一部分，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。并且还要配置android.permission.RECEIVE_BOOT_COMPLETED权限。

(2)Layout文件，main.xml

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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"      android:orientation = "vertical"      android:layout_width = "fill_parent"      android:layout_height = "fill_parent"             > < TextView        android:layout_width = "fill_parent"       android:layout_height = "fill_parent"       android:text = "@string/boottext"      android:textColor = "#5F2DD2"      android:background = "#FFFFFF"      android:textSize = "60px"       android:gravity = "center_horizontal"      /> </ LinearLayout >

完成后，编译出apk包，安装到模拟器或手机中。关机，重新开机，就会显示BootStartDemo这个Activity显示出来的页面。