Android 位图大于 heapSize

Question

我收到错误:java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=12295KB, Allocated=3007KB, Bitmap Size=15621KB)

位图大小大于我的heapSize..那么我怎样才能使位图变小呢？这是它崩溃的代码:

private Bitmap getPicture(int position) {
    Bitmap bmpOriginal = BitmapFactory.decodeFile(mFileLocations.get(position));
    Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.RGB_565);
    Canvas tempCanvas = new Canvas(bmResult);
    tempCanvas.rotate(90, bmpOriginal.getWidth()/2, bmpOriginal.getHeight()/2);
    tempCanvas.drawBitmap(bmpOriginal, 0, 0, null);
    bmpOriginal.recycle();
}

它在行崩溃:

 Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.RGB_565);

和我的解码文件:

private Bitmap decodeFile(String f){
    try {
        //Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f),null,o);

        //The new size we want to scale to
        final int REQUIRED_SIZE=70;

        //Find the correct scale value. It should be the power of 2.
        int scale=1;
        while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
            scale*=2;

        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {
        Log.d(LOG_TAG, "Failed to decode file");
    }
    return null;
}

Answer 1

缩小您的镜像以使其符合 VM 预算...

BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile( filename, options );
        options.inJustDecodeBounds = false;
        options.inSampleSize = 4; 

        bitmap = BitmapFactory.decodeFile( filename, options );
        if ( bitmap != null ) {
            bitmap = Bitmap.createScaledBitmap( bitmap, width, height, false );
        }

将样本大小更改为您想要的任何值，如 2、4、6、8 等。

有关详细信息，请参阅 this来自最近发布的 Android 开发者网站，它清楚地说明了您需要做什么才能达到 VM 预算。