android四大组件之BroadcastReceiver开机启动

package com.example.kaijistart;

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

public class BootReceiver extends BroadcastReceiver {
    public BootReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent it = new Intent(context,MainActivity.class);
        //设置新的任务栈,如果我们从系统图标点进去，系统会创建activity栈，
        //但是我们现在没有点击就要自己创建任务栈了
        it.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(it);
        System.out.println("开机了");
    }
}

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.kaijistart.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="com.example.kaijistart.BootReceiver" >
            <intent-filter >
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>
    </application>

</manifest>