Android(安卓)通过inputstream 加载非Drawable 文件夹下的 .9 path 图片
16lz
2021-01-24
有时候我们想在其他地方加载 .9 path 图片,比如 assets 目录下,又或者从网上下载一个到sdcard 上,但是 bitmap.getNinePatchChunk() 总是 return null,而如果9path图片在drawable 文件下则可以。为什么会这样呢?是因为9path 图片有两种type,一种叫“source” 一种叫“compiled”. “source” 就是我们通过android sdk 工具制作好的9path 图片,“compiled” 就是打包apk 的时候aapt 会对9path图片进行编译。这就是我们为什么能使用drawable 下的9path图片,所以如果我们想在其他地方也正常使用9path 图片,那么我们就得事先对其进行compile,把编译好的在放在assets 目录或者其他地方。
编译命令 : aapt c -S nine_path_file_floder -C output_floder
// 加载9path并设置background Bitmap bitmap =IconUtils.getBitmapFromFile("assets/easou_ecom_mads_bg_down.9.png"); final byte[] chunk = bitmap.getNinePatchChunk(); if (NinePatch.isNinePatchChunk(chunk)) { bottomLayout.setBackgroundDrawable(new NinePatchDrawable(getContext().getResources(), bitmap, chunk, NinePatchChunk.deserialize(chunk).mPaddings, null)); }//IconUtils.class public static Bitmap getBitmapFromFile(String fileName) { InputStream is = IconUtils.class.getClassLoader().getResourceAsStream(fileName); return BitmapFactory.decodeStream(is); }//NinePatchChunk.classpublic 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; }}
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