本文主要是介绍Android进程保活全攻略(中),希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
在上一篇博客Android进程保活全攻略(上)中介绍了进程保活的背景和一些方法的思路和实现方式,本篇博客我将承接上篇博客,继续进行介绍。
9) 1像素悬浮层
**思路:**1像素悬浮层是传说的QQ黑科技,监控手机锁屏解锁事件,在屏幕锁屏时启动1个像素的 Activity,在用户解锁时将 Activity 销毁掉。注意该 Activity 需设计成用户无感知。通过该方案,可以使进程的优先级在屏幕锁屏时间由4提升为最高优先级1。
保活强度:
前台进程,跟前台服务差不多。需要权限,不敌force-stop
实现代码:
首先定义 Activity,并设置 Activity 的大小为1像素:
public class MainActivity extendsAppCompatActivity {private static final StringTAG="keeplive";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//setContentView(R.layout.activity_main);Window window = getWindow();window.setGravity(Gravity.LEFT|Gravity.TOP);WindowManager.LayoutParams params = window.getAttributes();params.x=0;params.y=0;params.height=1;params.width=1;window.setAttributes(params);}
}
其次,从 AndroidManifest 中通过如下属性,排除 Activity 在 RecentTask 中的显示:
<activity
android:name=".KeepAliveActivity"android:excludeFromRecents="true"android:exported="false"android:finishOnTaskLaunch="false"android:launchMode="singleInstance"android:process=":live"android:theme="@style/LiveActivityStyle">
</activity>
最后,控制 Activity 为透明:
<stylename="LiveActivityStyle"><itemname="android:windowBackground">@android:color/transparent</item><itemname="android:windowFrame">@null</item><itemname="android:windowNoTitle">true</item><itemname="android:windowIsFloating">true</item><itemname="android:windowIsTranslucent">true</item><itemname="android:windowContentOverlay">@null</item><itemname="android:windowAnimationStyle">@null</item><itemname="android:windowDisablePreview">true</item><itemname="android:windowNoDisplay">true</item>
</style>
Activity 启动与销毁时机的控制:
public class KeepLiveReceiver extendsBroadcastReceiver {privateContextmContext;@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals(Intent.ACTION_SCREEN_OFF)) {KeepLiveManeger.getInstance(mContext).startKeepLiveActivity();} else if (action.equals(Intent.ACTION_USER_PRESENT)) {KeepLiveManeger.getInstance(mContext).destroyKeepLiveActivity();}KeepLiveManeger.getInstance(mContext).startKeepLiveService();}
}
10) 应用间互相拉起
**思路:**app之间知道包名就可以相互唤醒了,比如你杀了我qq,只要微信还在就能确保随时唤醒qq。还有百度全系app都通过bdshare实现互拉互保,自定义一个广播,定时发,其他app收广播自起等
11) 心跳唤醒
思路:微信保活技术,依赖系统特性:长连接网络回包机制
保活强度:不敌force-stop,需要网络,API level >= 23的doze模式会关闭所有的网络
代码实现:
public class HeartbeatService extends Service implements Runnable {private Thread mThread;public int count = 0;private boolean isTip = true;private static String mRestMsg;private static String KEY_REST_MSG = "KEY_REST_MSG";@Overridepublic void run() {while (true) {try {if (count > 1) {count = 1;if (isTip) {//判断应用是否在运行ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);List<RunningTaskInfo> list = am.getRunningTasks(3);for (RunningTaskInfo info : list) {if (info.topActivity.getPackageName().equals("org.yhn.demo")) {//通知应用,显示提示“连接不到服务器”Intent intent = new Intent("org.yhn.demo");intent.putExtra("msg", true);sendBroadcast(intent);break;}}isTip = false;}}if (mRestMsg != "" && mRestMsg != null) {//向服务器发送心跳包sendHeartbeatPackage(mRestMsg);count += 1;}Thread.sleep(1000 * 3);} catch (InterruptedException e) {e.printStackTrace();}}}private void sendHeartbeatPackage(String msg) {HttpGet httpGet = new HttpGet(msg);DefaultHttpClient httpClient = new DefaultHttpClient();// 发送请求HttpResponse httpResponse = null;try {httpResponse = httpClient.execute(httpGet);} catch (Exception e) {e.printStackTrace();}if (httpResponse == null) {return;}// 处理返回结果final int responseCode = httpResponse.getStatusLine().getStatusCode();if (responseCode == HttpStatus.SC_OK) {//只要服务器有回应就OKcount = 0;isTip = true;} else {Log.i("@qi", "responseCode " + responseCode);}}@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {super.onCreate();}@Overridepublic void onDestroy() {super.onDestroy();}public void onStart(Intent intent, int startId) {Log.i("@qi", "service onStart");//从本地读取服务器的URL,如果没有就用传进来的URLmRestMsg = getRestMsg();if (mRestMsg == null || mRestMsg == "") {mRestMsg = intent.getExtras().getString("url");}setRestMsg(mRestMsg);mThread = new Thread(this);mThread.start();count = 0;super.onStart(intent, startId);}public String getRestMsg() {SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);return prefer.getString(KEY_REST_MSG, "");}public void setRestMsg(String restMsg) {SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);SharedPreferences.Editor editor = prefer.edit();editor.putString(KEY_REST_MSG, restMsg);editor.commit();}}
最后别忘了注册Server和GET_TASKS
<service
android:name=".demo.HeartbeatService"android:label="QServer"android:persistent="true" ><intent-filter><action android:name="HeartbeatService" /></intent-filter>
</service>
<uses-permission android:name="android.permission.GET_TASKS" /><uses-permission android:name="android.permission.GET_TASKS" />
12) Native进程拉起
思路:开启native子进程,定时发intent
保活强度:单杀可以杀死,force close 5.0以上无效,5.0以下部分手机无效,第三方软件下无效,且无法保证实时常驻
实现代码:
首先开启一个c进程,将需要保活的service名字传递进去
private static void start(Context context, Class<?> daemonClazzName, int interval) {String cmd = context.getDir(BIN_DIR_NAME, Context.MODE_PRIVATE).getAbsolutePath() + File.separator + DAEMON_BIN_NAME;/* create the command string */StringBuilder cmdBuilder = new StringBuilder();cmdBuilder.append(cmd);cmdBuilder.append(" -p ");cmdBuilder.append(context.getPackageName());cmdBuilder.append(" -s ");cmdBuilder.append(daemonClazzName.getName());cmdBuilder.append(" -t ");cmdBuilder.append(interval);try {Runtime.getRuntime().exec(cmdBuilder.toString()).waitFor();} catch (IOException | InterruptedException e) {Log.e(TAG, "start daemon error: " + e.getMessage());}
}
然后定时给自己主进程发一个intent,如果主进程挂掉了,就可以顺利拉起来保证存活。
while(sig_running)
{interval = interval < SLEEP_INTERVAL ? SLEEP_INTERVAL : interval;select_sleep(interval, 0);LOGD(LOG_TAG, "check the service once, interval: %d", interval);/* start service */start_service(package_name, service_name);
}
但这只是一个没有主动权的消息轮询器,说是守护其实很勉强,而且,这是要建立在保证c进程不挂的基础上,才能轮询,但是就目前来看,只有5.0以下的非国产机才会有这样的漏洞。也就是说在force close的时候,系统忽略c进程的存在,5.0以上包括5.0的哪怕源生系统也会连同c进程一起清理掉,国产机就更不用说了。就算是这样,在5.0以下的非国产机上,如果安装了获取root权限的360\cm的话,也是可以直接清理掉,也就是说会失效。
native进程守护缺点非常明显,那就是守护是单向的,也就是说只能a保b,b保不了a;a保b也不是在b死了立刻拉起来,要等到了时间才会去拉。那如何解决这个native进程的缺点呢?那就是通过双进程守护,下一篇我将详细讲解如何通过linux层来实现双进程守护。
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