Android 開機自啟動

首先實現開機自啟動：

第一步創建一個廣播接收者，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);//啟動應用//Intent intent = getPackageManager().getLaunchIntentForPackage(packageName);//context.startActivity(intent);}
}

第二步給receiver配置對應intent-filter

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

第三步添加權限，缺少這步則無法在Android 3.0及其之前版本上自啟動

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

上面的實現有以下【限制】：

1.由于Android系統在外置SD卡加載前廣播ACTION_BOOT_COMPLETED，于是如果應用安裝在外置SD卡上，它無法接收到此廣播，原文見Broadcast Receivers listening for "boot completed"。

2.從Android 3.1（API level和對應NDK版本）開始，系統的包管理器保持跟蹤處于停止狀態(stopped state)的應用程序，提供了一種控制其從后臺進程和其它應用程序啟動的方式。這種停止狀態的應用程序指那些安裝了但從未啟動過的apk，或被用戶在程序管理中force stop的apk。Android系統為防止廣播無意或不必要開啟停止狀態的組件，它給所有廣播intent添加了FL??AG_EXCLUDE_STOPPED_PACKAGES標志（不設置和同FLAG_INCLUDE_STOPPED_PACKAGES一起設置結果都是此標志），

Intent.java

public boolean isExcludingStopped() {return (mFlags&(FLAG_EXCLUDE_STOPPED_PACKAGES|FLAG_INCLUDE_STOPPED_PACKAGES))== FLAG_EXCLUDE_STOPPED_PACKAGES;}

IntentResolver.java

/*** 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;}...

此標志指廣播intent排除停止狀態的應用，原文見Launch controls on stopped applications。用戶可以給自己的應用或者后臺服務添加FLAG_INCLUDE_STOPPED_PACKAGES標志以喚醒停止狀態的應用，但系統自帶的廣播intent，用戶無法修改，只能接受；注意系統級應用都不是停止狀態。

PackageManagerService.java中重寫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) {// System apps are never considered stopped for purposes of// filtering, because there may be no way for the user to// actually re-launch them.return (ps.pkgFlags&ApplicationInfo.FLAG_SYSTEM) == 0&& ps.getStopped(userId);}}return false;}private final class 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) {// System apps are never considered stopped for purposes of// filtering, because there may be no way for the user to// actually re-launch them.return (ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) == 0&& ps.getStopped(userId);}}return false;}

于是把apk安裝在root過的手機中的/system/app下面就能實現apk開機自啟動。

最后禁止開機自啟動，參考文章android手機root后的安全問題 （四）。