解決方法1：Is there an alternative for getRunningTask API

String getTopPackage(){long ts = System.currentTimeMillis();UsageStatsManager mUsageStatsManager = (UsageStatsManager)getSystemService("usagestats");List<UsageStats> usageStats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, ts-1000, ts);if (usageStats == null || usageStats.size() == 0) {return NONE_PKG;}Collections.sort(usageStats, mRecentComp);return usageStats.get(0).getPackageName(); } static class RecentUseComparator implements Comparator<UsageStats> {@Overridepublic int compare(UsageStats lhs, UsageStats rhs) {return (lhs.getLastTimeUsed() > rhs.getLastTimeUsed()) ? -1 : (lhs.getLastTimeUsed() == rhs.getLastTimeUsed()) ? 0 : 1;} }

需要的權限

<uses-permission xmlns:tools="http://schemas.android.com/tools"android:name="android.permission.PACKAGE_USAGE_STATS"tools:ignore="ProtectedPermissions" />

設置界面授權

Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS); startActivity(intent);

檢查是否申請了權限

public static boolean needPermissionForBlocking(Context context) {try {PackageManager packageManager = context.getPackageManager();ApplicationInfo applicationInfo = packageManager.getApplicationInfo(context.getPackageName(), 0);AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);int mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, applicationInfo.uid, applicationInfo.packageName);return (mode != AppOpsManager.MODE_ALLOWED);} catch (PackageManager.NameNotFoundException e) {return true;} }

解決方法2：getRunningTasks doesn’t work in Android L

Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS); startActivity(intent);public void getTopActivtyFromLolipopOnwards(){String topPackageName ;if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {UsageStatsManager mUsageStatsManager = (UsageStatsManager)getSystemService(Context.USAGE_STATS_SERVICE);long time = System.currentTimeMillis();// We get usage stats for the last 10 secondsList<UsageStats> stats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, time - 1000*10, time);// Sort the stats by the last time usedif(stats != null) {SortedMap<Long,UsageStats> mySortedMap = new TreeMap<Long,UsageStats>();for (UsageStats usageStats : stats) {mySortedMap.put(usageStats.getLastTimeUsed(),usageStats);}if(mySortedMap != null && !mySortedMap.isEmpty()) {topPackageName = mySortedMap.get(mySortedMap.lastKey()).getPackageName();Log.e("TopPackage Name",topPackageName);}}} }

總結

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