Question

我使用以下代码在飞行中创建一个用于拍摄照片时预览的窗口：

void CreatePreviewDialog()
{               
    dummy_frame_layout = new DummyFrameLayout(context);

    wm_params = new WindowManager.LayoutParams(
            240, 320, 0, 0,
            WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,                
            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
            WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
            WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
            WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON|                
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
            PixelFormat.TRANSLUCENT);

    wm_params.gravity = Gravity.CENTER;
    wm_params.setTitle("Preview");

    window_manager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
    window_manager.addView(dummy_frame_layout, wm_params);
}

我的应用在后台运行，它被闹钟唤醒。如您所见，它会打开显示屏。拍摄照片后，使用以下方法销毁窗口：

void DestroyPreviewDialog()
{
    ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).removeView(dummy_frame_layout);
    dummy_frame_layout = null;
}

问题是屏幕仍然亮着。我想在预览窗口关闭时关闭屏幕。如何以关闭显示的方式修改DestroyPreviewDialog()？（当然，只有在调用CreatePreviewDialog()时发现关闭时才会关闭显示器，但这很简单。现在我需要一种方法来关闭显示器）

修改我修改了DestroyPreviewWindow()如下：

private void DestroyPreviewDialog()
{
    wm_params.screenBrightness = 0.0f;
    window_manager.updateViewLayout(dummy_frame_layout, wm_params);

    ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).removeView(dummy_frame_layout);
    dummy_frame_layout = null;
}

但结果不会改变。屏幕仍然亮着！

即使应用程序处于后台，也会关闭显示屏

0 个答案: