android – NinePatchDrawable没有从块中获取填充

我需要帮助NinePatchDrawable：

我的应用程序可以从网络下载主题.
几乎所有的事情都可以正常工作,除了9-Patch PNG.

final Bitmap bubble = getFromTheme("bubble");
if (bubble == null) return null;

final byte[] chunk = bubble.getNinePatchChunk();
if (!NinePatch.isNinePatchChunk(chunk)) return null;

NinePatchDrawable d = new NinePatchDrawable(getResources(),bubble,chunk,new Rect(),null);
v.setBackgroundDrawable(d);

d = null;
System.gc();

getFromTheme()从SD卡加载Bitmap. 9-Patch PNG已经被编译,这意味着它们包含了所需的块.

我将Bitmap转换为NinePatchDrawable对象的方式似乎是有效的,因为图像是可拉伸的,并且我绘制它.

唯一不起作用的是填充.我已经尝试将填充设置为这样的视图：

final Rect rect = new Rect();   // or just use the new Rect() set
d.getPadding(rect);             // in the constructor
v.setPadding(rect.left,rect.top,rect.right,rect.bottom);

d.getPadding(rect)应该从块中填充变量rect,不应该吗？但它没有.

结果：TextView(v)不显示9-Patch图像的内容区域中的文本.每个坐标中的paddings设置为0.

谢谢阅读.

解决方法

最后,我做到了Android没有正确解释块数据.可能有bug所以你必须自己反序列化块以获取填充数据.

开始了：

package com.dragonwork.example;

import android.graphics.Rect;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

class NinePatchChunk {

    public static final int NO_COLOR = 0x00000001;
    public static final int TRANSPARENT_COLOR = 0x00000000;

    public final Rect mPaddings = new Rect();

    public int mDivX[];
    public int mDivY[];
    public int mColor[];

    private static void readIntArray(final int[] data,final ByteBuffer buffer) {
        for (int i = 0,n = data.length; i < n; ++i)
            data[i] = buffer.getInt();
    }

    private static void checkDivCount(final int length) {
        if (length == 0 || (length & 0x01) != 0)
            throw new RuntimeException("invalid nine-patch: " + length);
    }

    public static NinePatchChunk deserialize(final byte[] data) {
        final ByteBuffer byteBuffer =
            ByteBuffer.wrap(data).order(ByteOrder.nativeOrder());

        if (byteBuffer.get() == 0) return null; // is not serialized

        final NinePatchChunk chunk = new NinePatchChunk();
        chunk.mDivX = new int[byteBuffer.get()];
        chunk.mDivY = new int[byteBuffer.get()];
        chunk.mColor = new int[byteBuffer.get()];

        checkDivCount(chunk.mDivX.length);
        checkDivCount(chunk.mDivY.length);

        // skip 8 bytes
        byteBuffer.getInt();
        byteBuffer.getInt();

        chunk.mPaddings.left = byteBuffer.getInt();
        chunk.mPaddings.right = byteBuffer.getInt();
        chunk.mPaddings.top = byteBuffer.getInt();
        chunk.mPaddings.bottom = byteBuffer.getInt();

        // skip 4 bytes
        byteBuffer.getInt();

        readIntArray(chunk.mDivX,byteBuffer);
        readIntArray(chunk.mDivY,byteBuffer);
        readIntArray(chunk.mColor,byteBuffer);

        return chunk;
    }
}

使用上面的类如下：

final byte[] chunk = bitmap.getNinePatchChunk();
if (NinePatch.isNinePatchChunk(chunk)) {
    textView.setBackgroundDrawable(new NinePatchDrawable(getResources(),bitmap,NinePatchChunk.deserialize(chunk).mPaddings,null));
}

它会工作完美！