import android.media.ThumbnailUtils;
import android.provider.MediaStore.Video.Thumbnails;

Bitmap icon=null;//方法已經定義，不需新增
//顯示圖片縮圖
if（mimeType.startsWith("image/")){
Bitmap bitmap=BitmapFactory.decodeFile(fileInfo.getFileAbsolutePath());//fileInfo.getFileAbsolutePath()方法得到檔案路徑的字串形式
icon=ThumbnailUtils.extractThumbnail(bitmap,96,96,ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
}
//顯示視訊第一幀縮圖
if(mimeType.startsWith("video/")){
icon=ThumbnailUtils.createVideoThumbnail(fileInfo.getFileAbsolutePath(),Thumbnails.MICRO_KIND);
}
//針對HTML和HTM檔案字尾進行判別顯示相應的圖片
int iconId=getDrawableId(service,mimeType);//已經定義，無需新增
if(mimeType.startsWith("text/html")){
if(fileInfo.getFileAbsolutePath().endsWith("html")){
iconId=R.drawable.fm_html;
}
else{
iconId=R.drawable.fm_htm;
}
}
 

private static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {
        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;
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }
        return inSampleSize;
    }
 
    // 如果是放大圖片，filter決定是否平滑，如果是縮小圖片，filter無影響
    private static Bitmap createScaleBitmap(Bitmap src, int dstWidth,
            int dstHeight) {
        Bitmap dst = Bitmap.createScaledBitmap(src, dstWidth, dstHeight, false);
        if (src != dst) { // 如果沒有縮放，那麼不回收
            src.recycle(); // 釋放Bitmap的native畫素陣列
        }
        return dst;
    }
 
    // 從Resources中載入圖片
    public static Bitmap decodeSampledBitmapFromResource(Resources res,
            int resId, int reqWidth, int reqHeight) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resId, options); // 讀取圖片長寬
        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight); // 計算inSampleSize
        options.inJustDecodeBounds = false;
        Bitmap src = BitmapFactory.decodeResource(res, resId, options); // 載入一個稍大的縮圖
        return createScaleBitmap(src, reqWidth, reqHeight); // 進一步得到目標大小的縮圖
    }
 
    // 從sd卡上載入圖片
    public static Bitmap decodeSampledBitmapFromFd(String pathName,
            int reqWidth, int reqHeight) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(pathName, options);
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;
        Bitmap src = BitmapFactory.decodeFile(pathName, options);
        return createScaleBitmap(src, reqWidth, reqHeight);
    }
 

if(mimeType.startsWith("image/")){
icon=decodeSampleBitmapFromFd(fileInfo.getFileabsolutePath(),96,96);
}

Bitmap dst = Bitmap.createScaledBitmap(src, dstWidth, dstHeight, false);
 

private static Bitmap createScaleBitmap(Bitmap src, int dstWidth,
            int dstHeight) {
Bitmap dst=null;
if(src!=null){
dst = Bitmap.createScaledBitmap(src, dstWidth, dstHeight, false);
}
        if (src != dst) { 
            src.recycle();
        }
        return dst;
    }