如何添加一个PNG图像作为背景在Android中，没有修改（条纹）？ [英] How to add a PNG image as background in Android with no alteration (banding)?

问题描述

我想添加背景，其中包括一个梯度（我确实希望使用图像，而不是Android的XML声明的渐变效果）。

I'm trying to add a background that includes a gradient (I do want to use an image, not an android xml declared gradient effect).

这形象显着搭载Android毁了，把它添加一些蹩脚的条纹无论我尝试的结果是相同的（两个捕获大约在同一区域的扭曲/正常图像）：

This image is remarkably ruined by Android, it add some crappy banding whatever I try the result is the same (two capture of approximately the same region the distorted/normal images) :

我的形象被用作在我的布局XML布局背景：

My image is used as a layout background inside my layout XML :

android:background="@drawable/background_gradient_dithered"

我试图用一个中间绘制强制抖动的XML是：

I've tried to used an intermediate drawable to force dither whose xml is :

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/background_gradient" android:dither="true" android:antialias="true" android:filter="true"/>

我试过有以下code在我的onCreate（）：

I've tried to have the following code in my onCreate() :

getWindow().setFormat(PixelFormat.RGBA_8888);

这两种尝试改变什么。

Both tries changed nothing.

感谢

推荐答案

正确的解决办法是....我敢打赌，你已经猜它：重新启动Eclipse的我已经学会了，每次在Android上的问题可能是重新启动Eclipse问题。

The correct solution was .... I bet you've guess it : restarting Eclipse. I've learned it, every problem on Android might be a "restart Eclipse problem".

在一些测试，我可以补充一点，使dethering是没有用的，当格式设置为PixelFormat.RGBA_8888

After some test I can add that enabling dethering is not useful when Format is set to PixelFormat.RGBA_8888

读者应该给看看由@ TenFour04给出了答案，这种方法可避免使刚刚绘制，使抖动。

Readers should give a look to the answer given by @TenFour04, this approach can avoid to make drawable just to enable dithering.

window.addFlags(WindowManager.LayoutParams.FLAG_DITHER);

编辑：

我发现，即使这些技巧的问题，能坚持。您可以尝试modifiy您的PNG有它的alpha层（更改像素的例如99％的透明度），这将迫使Android的编译器不与它玩了。

I've found out that even with these tricks the problem can persist. You can try to modifiy your PNG to have an alpha layer in it (change a pixel to a transparency of 99% for example), this would force android compiler to not play with it.

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