使用场景：手机开机后，自动运行程序，在屏幕上显示”Hello. I started!”字样。
背景知识：当Android手机启动时，会发出一个系统广播，叫做：ACTION_BOOT_COMPLETED，它的字符串表示常量为android.intent.action.BOOT_COMPLETED。所以只要在开始时程序中捕获这个广播消息，一切就好办了。
代码如下：
1、界面代码，
package com.andy.zhu;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;
import android.content.Intent;
public class MainActivity extends Activity
{
private Button button_test_service;
private Intent intent;
private Button button_stop;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
tv.setText("hello started");
setContentView(tv);
}
}2、接受广播消息，所以新建一个类，并继承BroadcastReceiver
package com.andy.zhu;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.util.Log;
public class BootRestartReceiver extends BroadcastReceiver
{
private final String ACTION = "android.intent.action.BOOT_COMPLETED";
@Override
public void onReceive(Context context, Intent intent)
{
// TODO Auto-generated method stub
if (intent.getAction().equals(ACTION));
{
Intent intent2 = new Intent(context, MainActivity.class);
intent2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent2);
Log.d("DEBUG", "开机自动服务自动启动...");
//Intent intentService = new Intent();
//intentService.setClass(context, MyService.class);
//context.startService(intentService);
}
}
}代码都很简单。重写onReceiver方法，实现要实现的功能就行了。
3、配置menifest.xml文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.andy.zhu"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="10" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:persistent="true"
android:theme="@style/AppTheme" >
<activity
android:name="com.andy.zhu.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>
<!-- 向系统注册receiver -->
<receiver
android:name="com.andy.zhu.BootRestartReceiver"
>
<intent-filter >
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
</application>
<!-- 添加权限 -->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
</manifest>