Android渐变永远无法正常工作(始终绑定) [英] Android gradient NEVER works (always banding)

问题描述

我试图添加(径向)渐变作为背景(在Android 4.0中)，无论是作为背景图像还是以编程方式添加，但是它们都不起作用.我只能在模拟器中对其进行测试，但我猜它在4.0设备上是相同的.

I tried to add a (radial) gradient as background (in Android 4.0), either as background image or programmatically but none of them never works. I can only test it in emulator, but I guess it's the same on a 4.0 device.

这些解决方案不起作用:

These solutions don't work:

• 放置在原始文件夹中.(禁用Android资源/图像/png优化)
• 使具有抖动和反锯齿的代理xml为真，并将png的opacy保存为99％.( android:dither ="true"不会抖动，这是怎么回事?)
• 在onAttachedToWindow上覆盖( Android:使用线性渐变作为背景看起来是带条纹的)
• 移动到hdpi文件夹( Gingerbread上的渐变)
• 以编程方式进行渐变( http://crazygui.wordpress.com/2010/09/05/high-quality-radial-gradient-in-android/)

我想我还尝试了一些尝试，但是也许有人对如何建立工作渐变作为背景有一个想法?

I guess I tried some more things but maybe someone has an idea how to build a working gradient as background?

我当前的代码如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SplashScreen">

    <ImageView
        android:id="@+id/imageViewLogo"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:contentDescription="@string/desc_string"
        android:scaleType="centerCrop"
        android:src="@drawable/background_image" />

</RelativeLayout>

和background_image.xml

and background_image.xml

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

推荐答案

显然，它只是模拟器.在真实的设备上看起来不错.

Obviously it's just the emulator. On a real device it looks good.

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