怎样保存一个图像连同它的thuml然后显示在imageView中

public static Bitmap getSmallBitmap(String filePath) {
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filePath, options);

    // Calculate inSampleSize
    options.inSampleSize = 2;

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;

    Bitmap bm = BitmapFactory.decodeFile(filePath, options);
    if(bm == null){
        return  null;
    }
    ByteArrayOutputStream baos = null ;
    try{
        baos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    }finally{
        try {
            if(baos != null)
                baos.close() ;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return bm ;

}

这样可以从文件中得到图片。

Intent mediaScanIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
            File f = new File(mCurrentPhotoPath);
            Uri contentUri = Uri.fromFile(f);
            mediaScanIntent.setData(contentUri);
            this.sendBroadcast(mediaScanIntent);

上面的code可以把图片保存到图片库中