Android 判断app是否在前台运行

public boolean isAppOnForeground(String packageName) {
ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
if (activityManager == null) {
return false;
}
List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
if (appProcesses == null) {
return false;
}
for (RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.processName.equals(packageName)
&& appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}

public boolean isAppOnForeground(String packageName) {
ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
if (activityManager == null) {
return false;
}
ComponentName componentName = activityManager.getRunningTasks(1).get(0).topActivity;
if (componentName.getPackageName().equals(packageName)) {
return true;
}
return false;
}

<uses-permission android:name="android.permission.GET_TASKS"/>