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我使用了以下代码，Gallery View但出现以下异常。谁能告诉我我错在哪里？

07-18 12:45:59.774: WARN/System.err(6758): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
07-18 12:45:59.774: WARN/System.err(6758):     at android.graphics.Bitmap.nativeCreate(Native Method)
07-18 12:45:59.774: WARN/System.err(6758):     at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
07-18 12:45:59.774: WARN/System.err(6758):     at android.graphics.Bitmap.createBitmap(Bitmap

我的代码：

public boolean createReflectedImages() {
    //The gap we want between the reflection and the original image
    final int reflectionGap = 4;

    int index = 0;
    for (int imageId : mImageIds) {
        try
        {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inTempStorage = new byte[16*1024];

            Bitmap originalImage = BitmapFactory.decodeResource(getResources(), 
                            imageId,options);
            int width = originalImage.getWidth();
            int height = originalImage.getHeight();

            //This will not scale but will flip on the Y axis
            Matrix matrix = new Matrix();
            matrix.preScale(1, -1);

            //Create a Bitmap with the flip matrix applied to it.
            //We only want the bottom half of the image
            reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);


            //Create a new bitmap with same width but taller to fit reflection
             bitmapWithReflection = Bitmap.createBitmap(width 
              , (height + height/2), Config.ARGB_8888);

            //Create a new Canvas with the bitmap that's big enough for
            //the image plus gap plus reflection
            Canvas canvas = new Canvas(bitmapWithReflection);
            //Draw in the original image
            canvas.drawBitmap(originalImage, 0, 0, null);
            //Draw in the gap
            Paint deafaultPaint = new Paint();
            canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
            //Draw in the reflection
            canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);

            //Create a shader that is a linear gradient that covers the reflection
            Paint paint = new Paint(); 
            LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, 
                bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, 
                TileMode.CLAMP); 
            //Set the paint to use this shader (linear gradient)
            paint.setShader(shader); 
            //Set the Transfer mode to be porter duff and destination in
            paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); 
            //Draw a rectangle using the paint with our linear gradient
                canvas.drawRect(0, height, width, 
                bitmapWithReflection.getHeight() + reflectionGap, paint); 
           ImageView imageView = new ImageView(mContext);
           imageView.setImageBitmap(bitmapWithReflection);
           imageView.setLayoutParams(new CoverFlow.LayoutParams(200, 280));
           imageView.setScaleType(ScaleType.MATRIX);
           mImages[index++] = imageView;
       }catch(Exception e)
       {
           e.printStackTrace();
       }
   }
   return true;
}
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1 回答 1

3

您正在加载的图像可能超出了您的 Android 应用程序的 RAM 限制。您应该inSampleSize在加载图像时使用它，以便在它占用所有内存之前缩小它。我使用这个函数来加载我所有的图像：

public static Bitmap decodeFile(File file, int size){
    try {
        //Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inPurgeable = true;
        o.inInputShareable = true;
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(file),null,o);

        //The new size we want to scale to
        final int REQUIRED_SIZE = size;

        //Find the correct scale value. It should be the power of 2.
        int width_tmp=o.outWidth, height_tmp=o.outHeight;
        int scale=1;
        while(true){
            if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                break;
            width_tmp/=2;
            height_tmp/=2;
            scale*=2;
        }

        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(file), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}

那里有几个额外的选项，但对你的问题来说最大的一个是inSampleSize它必须是 2 的幂。希望这会有所帮助。

于 2011-07-18T13:04:31.303 回答