如何以编程方式终止Oreo中的后台任务？

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

ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> runningProcesses = activityManager.getRunningAppProcesses();

for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
    // 判断进程是否为后台任务
    if (processInfo.importance > ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
        // 终止后台任务
        activityManager.killBackgroundProcesses(processInfo.processName);
    }
}