拉风的咖菲猫

尝试这个：ActivityManager mActivityManager =(ActivityManager)this.getSystemService(Context.ACTIVITY_SERVICE);if(Build.VERSION.SDK_INT > 20){String mPackageName = mActivityManager.getRunningAppProcesses().get(0).processName;}else{  String mpackageName = mActivityManager.getRunningTasks(1).get(0).topActivity.getPackageName();}我们可以使用UsageStats：public static String getTopAppName(Context context) {    ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    String strName = "";    try {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            strName = getLollipopFGAppPackageName(context);        } else {            strName = mActivityManager.getRunningTasks(1).get(0).topActivity.getClassName();        }    } catch (Exception e) {        e.printStackTrace();    }    return strName;}private static String getLollipopFGAppPackageName(Context ctx) {    try {        UsageStatsManager usageStatsManager = (UsageStatsManager) ctx.getSystemService("usagestats");        long milliSecs = 60 * 1000;        Date date = new Date();        List queryUsageStats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, date.getTime() - milliSecs, date.getTime());        if (queryUsageStats.size() > 0) {            Log.i("LPU", "queryUsageStats size: " + queryUsageStats.size());        }        long recentTime = 0;        String recentPkg = "";        for (int i = 0; i < queryUsageStats.size(); i++) {            UsageStats stats = queryUsageStats.get(i);            if (i == 0 && !"org.pervacio.pvadiag".equals(stats.getPackageName())) {                Log.i("LPU", "PackageName: " + stats.getPackageName() + " " + stats.getLastTimeStamp());            }            if (stats.getLastTimeStamp() > recentTime) {                recentTime = stats.getLastTimeStamp();                recentPkg = stats.getPackageName();            }        }        return recentPkg;    } catch (Exception e) {        e.printStackTrace();    }    return "";}//启用USAGE_STATS    // Declare USAGE_STATS permisssion in manifest        Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);    startActivity(intent);