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云代码 - android代码库

加载大图片

2015-06-23 作者: Suppender举报

[android]代码库

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
 
public class LoadBitmapUtils {
 
    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);
    }
 
    /**
     * 计算需要缩放的比例
     *
     * @param options
     * @param reqWidth
     * @param reqHeight
     * @return int 算最大insamplesize值是2的幂
     */
    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;
        /***
         * 缩放比例,默认值是1(不缩放)
         */
        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.
            // 计算最大insamplesize值是2的幂,同时保持高度和宽度大于所要求的高度和宽度。
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }
 
        return inSampleSize;
    }
}


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