判断应用是否处于前台

private boolean isForeground() {
ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> processes = activityManager.getRunningAppProcesses();

if (processes == null || processes.isEmpty()) {
return false;
}

for (ActivityManager.RunningAppProcessInfo info : processes) {
if (info.processName.equals(getPackageName()) &&
info.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}