亮度滤网 [英] Brightness Screen Filter

问题描述

有谁知道如何实现像这里的亮度屏幕过滤器:

Does anyone have an idea how to implement an Brightness Screen Filter like the one here:

http://www.appbrain.com/app/screen-filter/com.haxor

我需要一个起点，但我不知道如何去做.

I need a starting point and I can't figure out how to do it.

推荐答案

只需制作一个透明的全屏 Activity，让触摸通过.要使触摸通过，请在设置 contentView 之前使用以下 Window 标志:

Just make a transparent full screen activity that lets touches pass through. To make touches pass through use the following Window flags before setting the contentView:

@Override
public void onCreate(Bundle savedInstanceState)
{
  super.onCreate(savedInstanceState);
  Window window = getWindow();

  // Let touches go through to apps/activities underneath.
  window.addFlags(FLAG_NOT_TOUCHABLE);

  // Now set up content view
  setContentView(R.layout.main);
}

对于您的 main.xml 布局文件，只需使用具有透明背景的全屏 LinearLayout:

For your main.xml layout file just use a full screen LinearLayout with a transparent background:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/background"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="#33000000">
</LinearLayout>

然后要调整亮度"，只需从代码中的某处更改背景颜色的值:

Then to adjust the "brightness" just change the value of the background colour from your code somewhere:

findViewById(R.id.background).setBackgroundColor(0x66000000);

这篇关于亮度滤网的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！