Android将drawable加载到ImageView中占用了大量内存

Question

我遇到了问题.

我动态地将9加载drawables到9 imageViews.(drawables各自不同的时间)的可绘制的ID被存储在该对象类,所以当我加载此抽拉我设置ImageRessource到imageView通过使用imageView.setImageRessource(myObject.getRessourceId()); 一切正常,但9绘项目被装载时,我看到在Android内存监视器,所述分配内存达到80MB,我认为这不正常......(是吗？)

我尝试了不同的东西来解决它:

• 用Picasso库加载drawable.
• 用于BitmapFactory.decodeResssource在imageView上创建一个Bitmap,然后设置setImageBitmap.

使用我尝试的所有技术,它需要80MB的分配内存.

我尝试使用不同的图像分辨率,所以在ldpi(~30Ko /图像)和xhdpi(~87Ko /图像),但它不会改变任何加载的每个图像,它需要大约5MB的分配内存...

所以我的问题是:如何减少为图像分配的内存？

提前谢谢,如果有必要,我可以提供部分代码.

问候

PS:ImageViews在onCreate()方法中动态创建.

Answer 1

感谢Bojan Kseneman的链接,我将分配的内存减少到30Mb.我正在使用这个:

imageView.setImageBitmap(Util.decodeSampledBitmapFromResource(getResources(), id, 150, 150));

Util是我项目的Utility类

用这些方法:

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);
    }

和

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) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }