Android系统屏幕亮度

Question

我正在开发打开屏幕的应用程序（如果它已被禁用）并将屏幕亮度更改为255.一切正常。设备的亮度变得最大。但是在稍微延迟之后，例如5秒，亮度必须返回到先前的值。但是这个值只有在阻止设备不能立即影响时才会影响，因为设置了最大值。我怎样才能立即影响价值。

P.S。抱歉我的英文。

更新

protected void onHandleIntent(Intent intent) {
    float brightnessFloat = 1.0f;
    getOldBrightness();
    setUpNewBrightness(brightnessFloat);
    try {
        Thread.sleep(1500);
    } catch (InterruptedException e) {
        System.out.println(e.toString());
    }
    returnOldBrightness();
}

private void getOldBrightness() {
    try {
        oldBrightness = Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS);
    } catch (Settings.SettingNotFoundException e) {
        Log.e(LOG_TAG, e.toString());
    }
}

private void setUpNewBrightness(float brightness) {
    int brightnessInt = (int) brightness * 255;
    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightnessInt);
    Log.i(LOG_TAG, "Old brightness: " + oldBrightness + " ===== New brightness: " + brightnessInt);
    startInvisibleActivity(brightness, false);
}

private void returnOldBrightness() {
    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, oldBrightness);
    float brightness = (float) oldBrightness / 255;
    Log.i(LOG_TAG, "New brightness: " + brightness);
    startInvisibleActivity(brightness, true);
}

private void startInvisibleActivity(float brightness, boolean screenUnlocked) {
    Intent invisibleActivityIntent = new Intent(getBaseContext(), InvisibleActivity.class);
    invisibleActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    invisibleActivityIntent.putExtra(BRIGHTNESS_VALUE, brightness);
    invisibleActivityIntent.putExtra(SCREEN_UNLOCKED, screenUnlocked);
    startActivity(invisibleActivityIntent);
}