1. 程式人生 > >安卓載入圖片過大而導致OOM記憶體溢位的解決方法(巨坑....)

安卓載入圖片過大而導致OOM記憶體溢位的解決方法(巨坑....)

如果圖片太大會造成OOM記憶體溢位的錯誤,需要用Bitmap的壓縮機制。

如果跳轉的頁面含有圖片可能會導致跳轉失敗。

比如說我這裡是一旦觸發了某個按鍵,就修改該xml的圖片和文字說明

則setImageResource應該改成這樣

imageview.setImageBitmap(decodeSampledBitmapFromResource(getResources(),name[i], 100, 100));

同時後面加上以下說明:
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) {

            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;
    }

經除錯,跳轉頁面不會崩潰,圖片正常載入.