現(xiàn)在通用的應用鎖實現(xiàn) 都是啟動一個service一直在后臺，判斷啟動的應用在我們的鎖內(nèi)，就啟動我們的鎖屏界面。

public class HookService extends Service {public final static String TAG = "TestService";private ActivityManager mActivityManager;private String mLastPackageName = "";@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {super.onCreate();mActivityManager = (ActivityManager) getSystemService("activity");checkWindow();}Handler mHandlertoast = new Handler() {@Overridepublic void handleMessage(Message msg) {LockHelper.getInstance().unLock(HookService.this, null, mLastPackageName);}};private void checkWindow() {new Thread() {@Overridepublic void run() {while (true) {fun();try {Thread.sleep(100);} catch (InterruptedException e) {}}}}.start();}private void fun() {String[] activePackages;if (Build.VERSION.SDK_INT > 20) {activePackages = getActivePackages();} else {activePackages = getActivePackagesCompat();}if (activePackages != null) {for (String activePackage : activePackages) {if (activePackage.equals("com.myth.cici")) {if (!activePackage.equals(mLastPackageName)) {mLastPackageName = activePackage;mHandlertoast.sendEmptyMessage(0);}}}}}String[] getActivePackagesCompat() {final List<ActivityManager.RunningTaskInfo> taskInfo = mActivityManager.getRunningTasks(1);final ComponentName componentName = taskInfo.get(0).topActivity;final String[] activePackages = new String[1];activePackages[0] = componentName.getPackageName();return activePackages;}private String[] getActivePackages() {final Set<String> activePackages = new HashSet<String>();final List<ActivityManager.RunningAppProcessInfo> processInfos = mActivityManager.getRunningAppProcesses();for (ActivityManager.RunningAppProcessInfo processInfo : processInfos) {if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {activePackages.addAll(Arrays.asList(processInfo.pkgList));}}return activePackages.toArray(new String[activePackages.size()]);} }

5.0以上使用getActivePackages();以下則使用getRunningAppProcesses。

判斷獲取到的活動的應用包名和我們鎖住的包名是否一致，一致則還要判斷是否是上次已經(jīng)解鎖了的，防止一直解鎖，然后就啟動我們的鎖屏界面了。

這只是個基本的部分，正式的還需要解決很多問題。比如Service被殺死了怎么辦等。

總結

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