亮度屏幕过滤器

Question

亮度屏幕过滤器

androidfilterscreenbrightness

17

有没有人知道如何实现像这里的亮度屏幕滤镜：

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

我需要一个起点，但我不知道该怎么做。

- Alex

我曾经遇到过同样的问题。我也在https://dev59.com/-0vSa4cB1Zd3GeqPhtZF上发布了这个问题。我最终解决了这个问题。你可以在帖子中看到正确的方法。 - Naveen Murthy

试试这个链接，它可能会对你有所帮助：http://android-er.blogspot.com/2011/02/change-android-screen-brightness.html - user762749

4个回答

5

Get an instance of WindowManager.

WindowManager windowManager = (WindowManager) Class.forName("android.view.WindowManagerImpl").getMethod("getDefault", new Class[0]).invoke(null, new Object[0]);
Create a full screen layout xml(layout parameters set to fill_parent)
Set your view as not clickable, not focusable, not long clickable, etc so that touch is passed through to your app and the app can detect it.

view.setFocusable(false); view.setClickable(false); view.setKeepScreenOn(false); view.setLongClickable(false); view.setFocusableInTouchMode(false);
Create a layout parameter of type android.view.WindowManager.LayoutParams. LayoutParams layoutParams = new LayoutParams();

Set layout parameter like height, width etc

layoutParams.height = LayoutParams.FILL_PARENT; 
layoutParams.width = LayoutParams.FILL_PARENT;
layoutParams.flags = 280; // You can try LayoutParams.FLAG_FULLSCREEN too
layoutParams.format = PixelFormat.TRANSLUCENT; // You can try different formats
layoutParams.windowAnimations = android.R.style.Animation_Toast; // You can use only animations that the system to can access
layoutParams.type = LayoutParams.TYPE_SYSTEM_OVERLAY;
layoutParams.gravity = Gravity.BOTTOM;
layoutParams.x = 0;
layoutParams.y = 0;
layoutParams.verticalWeight = 1.0F;
layoutParams.horizontalWeight = 1.0F;
layoutParams.verticalMargin = 0.0F;
layoutParams.horizontalMargin = 0.0F;

Key step: You can set what percentage of brightness you need. layoutParams.setBackgroundDrawable(getBackgroundDrawable(i));

private Drawable getBackgroundDrawable(int i) {
int j = 255 - (int) Math.round(255D * Math.exp(4D * ((double) i / 100D) - 4D));
return new ColorDrawable(Color.argb(j, 0, 0, 0));}

Finally add view to windowManager that you created earlier.

windowManager.addView(view, layoutParams);

注意：您需要SYSTEM_ALERT_WINDOW 权限才能在屏幕上放置覆盖层。

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

我已经测试过了，它可以运行。如果你遇到问题，请告诉我。

- Bharath Lakshman

请问您能否发布一个完整的答案来回答这个问题。使用示例将会非常感激。 - noobProgrammer

1

当然，您不能将这个用作生产代码，但如果您在玩耍...可以尝试这个未经记录的黑客技巧

它使用：

private void setBrightness(int brightness) {
try {
  IHardwareService hardware = IHardwareService.Stub.asInterface(
   ServiceManager.getService("hardware"));
  if (hardware != null) {
    hardware.setScreenBacklight(brightness);
  }
 } catch (RemoteException doe) {          
  }        
 }

请记得使用此权限：

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

- Reno

1

我能在哪里找到hardware09.jar文件？用于这个教程：http://www.tutorialforandroid.com/2009/01/changing-screen-brightness.html - noobProgrammer

0

你也可以尝试这个：

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.max_bright);



        WindowManager.LayoutParams lp = getWindow().getAttributes();

        lp.screenBrightness = 100 / 100.0f;

        getWindow().setAttributes(lp);

    }

- akkilis

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- pheelicks · Accepted Answer

创建一个透明的全屏Activity并让触摸事件穿透。在设置contentView之前，使用以下Window flags使触摸事件穿透：

@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，只需使用一个全屏幕LinearLayout，并设置透明背景：

<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”，只需在代码中某处更改背景颜色的值即可：

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