Question

我已经使用以下代码在后台重复图像，但它不起作用可以帮助吗？

Layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/grass_bg"
    >

drawable中的

grass_bg.xml看起来像这样

<?xml version="1.0" encoding="utf-8"?>
    <bitmap xmlns:android="http://schemas.android.com/apk/res/android"
        android:src="@drawable/grass_small"
        android:tileMode="repeat"/>

它显示出相同的小图像。它没有重复......

Answer 1

位图（及其状态）被重用了很多，我发现如果在多个地方使用BitmapDrawable，很容易丢失tileMode。以下代码为我解决了这个问题：

 public static void fixBackgroundRepeat(View view) {
      Drawable bg = view.getBackground();
      if(bg != null) {
           if(bg instanceof BitmapDrawable) {
                BitmapDrawable bmp = (BitmapDrawable) bg;
                bmp.mutate(); // make sure that we aren't sharing state anymore
                bmp.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT);
           }
      }
 }

Answer 2

每次使用时都会创建grass_bg.xml的副本（即grass_bg_2.xml）。这对我有用，可以确保在重复使用相同的背景时tileMode设置不会丢失。

Answer 3

我遇到了同样的问题，但决定深入研究。原因是我一直注意到我的一个可绘制的作品，而另一个总是被打破。诀窍是一个图像是由另一个图像制成的，只需对颜色和alpha进行微小的改动。除了参考PNG之外，Drawables的XML是相同的。所以我拿pnginfo看看那里有什么。

<强> diagstripe_dark.png：

Image Width: 18 Image Length: 30
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 3
Pixel depth (Pixel Depth): 24
Colour Type (Photometric Interpretation): RGB
Image filter: Single row per byte filter
Interlacing: Adam7 interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2835, 2835 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0

<强> diagstripe_yellow.png：

Image Width: 18 Image Length: 30
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 4
Pixel depth (Pixel Depth): 32
Colour Type (Photometric Interpretation): RGB with alpha channel
Image filter: Single row per byte filter
Interlacing: No interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2835, 2835 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0

diagstripe_yellow.png有效，而diagstripe_dark.png没有，如果我参考diagstripe_yellow.png替换对它的引用，那么它可以工作（至少在2.2.1我到这里）所以主要的区别是：

Channels (Samples/Pixel):
Pixel depth (Pixel Depth):
Colour Type (Photometric Interpretation):
Interlacing:

首先尝试禁用隔行扫描，没有运气，即使标题看起来相同：

<强> diagstripe_dark-2.png：

Image Width: 18 Image Length: 30
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 4
Pixel depth (Pixel Depth): 32
Colour Type (Photometric Interpretation): RGB with alpha channel
Image filter: Single row per byte filter
Interlacing: No interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 0, 0 (unit unknown)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0

如果有人在这里深入挖掘文件：http://webnetmobile.com/files/或使用base64工具解码下面引号中的文件：

<强> diagstripe_yellow.png：

iVBORw0KGgoAAAANSUhEUgAAABIAAAAeCAYAAAAhDE4sAAAAAXNSR0IArs4c6QAAAAlwSFlzAAAL
EwAACxMBAJqcGAAAAAd0SU1FB9wCEg8JKbHU3pgAAAAdaVRYdENvbW1lbnQAAAAAAENyZWF0ZWQg
d2l0aCBHSU1QZC5lBwAAAE5JREFUSMdj7OnpqWdgYGCQft3S8FS0poFcNhM1DHkqWtPAuLxc4D+l
hjAwMDAwWwa2MIx6bdRro14b9dqo10a9Nuo1Gnstj4GBQYgSAwG9j8m8FwE2EgAAAABJRU5ErkJg
gg==

<强> diagstripe_dark.png：

iVBORw0KGgoAAAANSUhEUgAAABIAAAAeCAIAAAHZaentAAAAAXNSR0IArs4c6QAAAAlwSFlzAAAL
EwAACxMBAJqcGAAAAAd0SU1FB9wCDww0GV3Ql5EAAAAdaVRYdENvbW1lbnQAAAAAAENyZWF0ZWQg
d2l0aCBHSU1QZC5lBwAAAGVJREFUOMvtkjsSgCAMRFfvfwOiV30WMCBqKFJIQ8XO/tgiAo6UAOUH
2ABJp5mqWri98B3ZXBmoogx0F4GX3w3LrQnZHju61Cfb6j15RqebG/23On/tHMiRkwheyxq5Rs4Z
aRZIXsBYcInPMeOmAAAAAElFTkSuQmCC

<强> stripes.xml：

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

如果你有任何进一步的说明，请说出来。

Answer 4

    try{ BitmapDrawable background = (BitmapDrawable) myView.getBackground();
    background.setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT); }
    catch(Exception e) { /*Do nothing; background is not BitmapDrawable; can be a color or null...*/ }

在android布局中不重复的背景图像

4 个答案: