Bitmap二次采样(处理图片过大的问题)

private Bitmap createImageThumbnail(String filePath, int newHeight,

int newWidth) {

BitmapFactory.Options options = new BitmapFactory.Options();

options.inJustDecodeBounds = true;

BitmapFactory.decodeFile(filePath, options);

int oldHeight = options.outHeight;

int oldWidth = options.outWidth;

// Log.i(TAG, "高度是：" + oldHeight + "，宽度是：" + oldWidth);

int ratioHeight = oldHeight / newHeight;

int ratioWidth = oldWidth / newWidth;

options.inSampleSize = ratioHeight > ratioWidth ? ratioWidth

: ratioHeight;

options.inPreferredConfig = Config.RGB_565;

options.inJustDecodeBounds = false;

Bitmap bm = BitmapFactory.decodeFile(filePath, options);

// Log.i(TAG, "高度是：" + options.outHeight + "，宽度是：" + options.outWidth);

return bm;

}