如何在Android中调整GIF图像的大小？

我有3张SD卡上的图像（1张jpg和2张gif）。我想减少它们以节省内存。调整大小后，JPG成功调整大小，但GIF图像具有原始大小。请参阅代码和日志：

public class BitmapHelper 
{
    private static int calculateInSampleSize(BitmapFactory.Options options, int imgHeigth, int imgWidth)
    {
        int inSampleSize = 1;

    if(imgHeigth > 80 || imgWidth > 120)
    {
        final int heightRatio = Math.round((float) imgHeigth / 80);
        final int widthRatio = Math.round((float) imgWidth / 120);

        if(heightRatio < widthRatio)
            return heightRatio;
        if(heightRatio > widthRatio)
            return widthRatio;
        if(heightRatio == widthRatio)
            return heightRatio;

    }

    return inSampleSize;
}

public Bitmap decodeBitmapFromFile(String imageUrl, Resources res)
{
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(imageUrl, options);
    if(options.outMimeType != null)
    {
        options.inSampleSize = calculateInSampleSize(options, options.outHeight, options.outWidth);
        options.inJustDecodeBounds = false;
        Bitmap bmp = BitmapFactory.decodeFile(imageUrl, options);
        Log.d("Debugger", "Height: " + options.outHeight + "; Width: " + options.outWidth);
        return bmp;

    }
    else
    {
        options.inSampleSize = 2;
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(res, R.drawable.play, options);
    }           
}
}

---

怎么了？提前感谢您。请尝试以下代码重新调整大小：

Display display = getWindow().getWindowManager().getDefaultDisplay();                    
                int hsize= (int) ((int)display.getHeight()-(display.getHeight()*(0.50)));
                int wsize= (int) ((int)display.getWidth()-(display.getWidth()*0.25));   

             Bitmap originalImage=decodeSampledBitmapFromResource(getResources(),imageId,wsize,hsize);             
             ImageView imageView = new ImageView(mContext);
             imageView.setImageBitmap(scaleBitmap(originalImage));
             imageView.setLayoutParams(new CoverFlow.LayoutParams(wsize,hsize));
             imageView.setScaleType(ScaleType.MATRIX);

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) 
    {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) 
{
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) 
    {
        if (width > height) 
        {
            inSampleSize = Math.round((float)height / (float)reqHeight);
        } else {
            inSampleSize = Math.round((float)width / (float)reqWidth);
        }
    }
    return inSampleSize;
}

private Bitmap scaleBitmap(Bitmap bitmap) 
   {

            int iWidth=bitmap.getWidth() ;
            int iHeight=bitmap.getHeight();
            int newWidth=0,newHeight=0;

            float fFactor=(float)iHeight/(float)iWidth; 

            if(iWidth<=iHeight)
            {
                     newWidth = 300;                                    
                     newHeight =(int) (newWidth * fFactor) ;//370;
            }
            else
            {
                    newWidth = 400;                             
                    newHeight =(int) (newWidth * fFactor) ;//370;
            }
               float fScaleWidth = ((float) newWidth) / iWidth;
               float fScaleHeight = ((float) newHeight) / iHeight;

               Matrix matrix = new Matrix();
               // resize the bit map
               matrix.postScale(fScaleWidth, fScaleHeight);

            Bitmap resizedBitmappreview = Bitmap.createBitmap(bitmap, 0, 0,iWidth, iHeight, matrix, true);

            return resizedBitmappreview;
    }

Display Display=getWindow（）.getWindowManager（）.getDefaultDisplay（）；
inthsize=（int）（（int）display.getHeight（）-（display.getHeight（）*（0.50））；
int wsize=（int）（（int）display.getWidth（）-（display.getWidth（）*0.25））；
位图originalImage=decodeSampledBitmapFromResource（getResources（），imageId，wsize，hsize）；
ImageView ImageView=新的ImageView（mContext）；
setImageBitmap（scaleBitmap（originalImage））；
setLayoutParams（新CoverFlow.LayoutParams（wsize，hsize））；
imageView.setScaleType（ScaleType.MATRIX）；
公共静态位图decodeSampledBitmapFromResource（资源res、int resId、int reqWidth、int reqHeight）
{
//使用INJUSTDECBOUNDS首次解码=true检查尺寸
final BitmapFactory.Options=new BitmapFactory.Options（）；
options.inJustDecodeBounds=true；
解码资源（res、resId、options）；
//计算样本大小
options.inSampleSize=计算样本大小（options、reqWidth、reqHeight）；
//使用inSampleSize集合解码位图
options.inJustDecodeBounds=false；
返回BitmapFactory.decodeResource（res、resId、options）；
}
公共静态int-calculateInSampleSize（BitmapFactory.Options选项、int-reqWidth、int-reqHeight）
{
//图像的原始高度和宽度
最终内部高度=options.outHeight；
最终整数宽度=options.outWidth；
int inSampleSize=1；
如果（高度>要求高度| |宽度>要求宽度）
{
如果（宽度>高度）
{
inSampleSize=数学圆（（浮动）高度/（浮动）要求高度）；
}否则{
inSampleSize=数学圆（（浮动）宽度/（浮动）宽度）；
}
}
返回样本大小；
}
专用位图缩放位图（位图位图）
{
int-iWidth=bitmap.getWidth（）；
int iHeight=bitmap.getHeight（）；
int newWidth=0，newHeight=0；
float fFactor=（float）iHeight/（float）iWidth；
如果（iWidth我担心这是一个android错误：

你有没有解决过这个问题？我也有同样的问题，调整GIF的大小不起作用。
Display display = getWindow().getWindowManager().getDefaultDisplay();                    
                int hsize= (int) ((int)display.getHeight()-(display.getHeight()*(0.50)));
                int wsize= (int) ((int)display.getWidth()-(display.getWidth()*0.25));   

             Bitmap originalImage=decodeSampledBitmapFromResource(getResources(),imageId,wsize,hsize);             
             ImageView imageView = new ImageView(mContext);
             imageView.setImageBitmap(scaleBitmap(originalImage));
             imageView.setLayoutParams(new CoverFlow.LayoutParams(wsize,hsize));
             imageView.setScaleType(ScaleType.MATRIX);

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) 
    {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) 
{
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) 
    {
        if (width > height) 
        {
            inSampleSize = Math.round((float)height / (float)reqHeight);
        } else {
            inSampleSize = Math.round((float)width / (float)reqWidth);
        }
    }
    return inSampleSize;
}

private Bitmap scaleBitmap(Bitmap bitmap) 
   {

            int iWidth=bitmap.getWidth() ;
            int iHeight=bitmap.getHeight();
            int newWidth=0,newHeight=0;

            float fFactor=(float)iHeight/(float)iWidth; 

            if(iWidth<=iHeight)
            {
                     newWidth = 300;                                    
                     newHeight =(int) (newWidth * fFactor) ;//370;
            }
            else
            {
                    newWidth = 400;                             
                    newHeight =(int) (newWidth * fFactor) ;//370;
            }
               float fScaleWidth = ((float) newWidth) / iWidth;
               float fScaleHeight = ((float) newHeight) / iHeight;

               Matrix matrix = new Matrix();
               // resize the bit map
               matrix.postScale(fScaleWidth, fScaleHeight);

            Bitmap resizedBitmappreview = Bitmap.createBitmap(bitmap, 0, 0,iWidth, iHeight, matrix, true);

            return resizedBitmappreview;
    }