首先实现开机自启动：
第一步创建一个广播接收者，如MyBootBroadcastReceiver.java
package com.example;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBootBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Intent startServiceIntent = new Intent(context, MyService.class);context.startService(startServiceIntent);}}
第二步给receiver配置对应intent-filter
<receiver android:name="MyBootBroadcastReceiver"><intent-filter><action android:name="android.intent.action.BOOT_COMPLETED" /></intent-filter> </receiver>
第三步添加权限，缺少这步则无法在Android 3.0及其之前版本上自启动
:name="android.permission.RECEIVE_BOOT_COMPLETED" />
上面的实现有以下【限制】：
1.由于Android系统在外置SD卡加载前广播ACTION_BOOT_COMPLETED，于是如果应用安装在外置SD卡上，它无法接收到此广播，原文见Broadcast Receivers listening for "boot completed"。
2.从Android 3.1（API level和对应NDK版本）开始，系统的包管理器保持跟踪处于停止状态(stopped state)的应用程序，提供了一种控制其从后台进程和其它应用程序启动的方式。这种停止状态的应用程序指那些安装了但从未启动过的apk，或被用户在程序管理中force stop的apk。Android系统为防止广播无意或不必要开启停止状态的组件，，它给所有广播intent添加了FLAG_EXCLUDE_STOPPED_PACKAGES标志（不设置和同FLAG_INCLUDE_STOPPED_PACKAGES一起设置结果都是此标志），
public boolean isExcludingStopped() {return (mFlags&(FLAG_EXCLUDE_STOPPED_PACKAGES|FLAG_INCLUDE_STOPPED_PACKAGES))== FLAG_EXCLUDE_STOPPED_PACKAGES;}
/*** Returns whether the object associated with the given filter is* "stopped," that is whether it should not be included in the result* if the intent requests to excluded stopped objects.*/protected boolean isFilterStopped(F filter, int userId) {return false;}private void buildResolveList(Intent intent, FastImmutableArraySet<String> categories,boolean debug, boolean defaultOnly,String resolvedType, String scheme, F[] src, List<R> dest, int userId) {…final boolean excludingStopped = intent.isExcludingStopped();final int N = src != null ? src.length : 0;boolean hasNonDefaults = false;int i;F filter;for (i=0; i<N && (filter=src[i]) != null; i++) {int match;if (debug) Slog.v(TAG, "Matching against filter " + filter);if (excludingStopped && isFilterStopped(filter, userId)) {if (debug) {Slog.v(TAG, " Filter’s target is stopped; skipping");}continue;}…
此标志指广播intent排除停止状态的应用，原文见Launch controls on stopped applications。用户可以给自己的应用或者后台服务添加FLAG_INCLUDE_STOPPED_PACKAGES标志以唤醒停止状态的应用，但系统自带的广播intent，用户无法修改，只能接受；注意系统级应用都不是停止状态。
中重写IntentResolver
final class ActivityIntentResolverextends IntentResolver<PackageParser.ActivityIntentInfo, ResolveInfo> {…@Overrideprotected boolean isFilterStopped(PackageParser.ActivityIntentInfo filter, int userId) {if (!sUserManager.exists(userId)) return true;PackageParser.Package p = filter.activity.owner;if (p != null) {PackageSetting ps = (PackageSetting)p.mExtras;if (ps != null) {(ps.pkgFlags&ApplicationInfo.FLAG_SYSTEM) == 0&& ps.getStopped(userId);}}return false;}ServiceIntentResolverextends IntentResolver<PackageParser.ServiceIntentInfo, ResolveInfo> {…@Overrideprotected boolean isFilterStopped(PackageParser.ServiceIntentInfo filter, int userId) {if (!sUserManager.exists(userId)) return true;PackageParser.Package p = filter.service.owner;if (p != null) {PackageSetting ps = (PackageSetting)p.mExtras;if (ps != null) {(ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) == 0&& ps.getStopped(userId);}}return false;}
人生没有彩排，只有现场直播，所以每一件事都要努力做得最好
