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发帖数: 54598 | 1 居然官方api里面没有找到
嗯，自己按照stackoverflow上的写了几个
其中一个是horizontal flip
还有一个是用最小内存消耗的方式读取图片到内存
default的8888格式吃内存太离谱了
还有就是android居然限制一个app只能16m
我插，让我想起小时候玩sfc，老板拿个磁盘一点一点读
也就只有16m
private static Map rectCache;
static {
rectCache = new HashMap();
}
public static void drawImage(Canvas canvas, Bitmap bitmap, Rect source,
Rect dest, Paint paint, boolean horizontalRotate) {
if (horizontalRotate) {
if (rectCache.get(dest) == null) {
rectCache.put(dest, new Rect());
}
Rect rect = rectCache.get(dest);
rect.set(canvas.getWidth() - dest.right, dest.top,
canvas.getWidth() - dest.left, dest.bottom);
canvas.scale(-1, 1);
canvas.translate(-canvas.getWidth(), 0);
canvas.drawBitmap(bitmap, source, rect, paint);
canvas.setMatrix(null);
} else
canvas.drawBitmap(bitmap, source, dest, paint);
}
public static Bitmap readBitMap(Context context, int resId) {
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inPreferredConfig = Bitmap.Config.RGB_565;
opt.inPurgeable = true;
opt.inInputShareable = true;
InputStream is = context.getResources().openRawResource(resId);
return BitmapFactory.decodeStream(is, null, opt);
} |
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