Question

我从服务器下载图像并存储在SD卡中但是当我将图像从SD卡加载到imageview时它给出了堆memory.i也尝试使用picasso库，如下面但同样给堆。像使用picaso

我从服务器下载并存储在SD卡中的图像网址，例如因为我需要离线显示图像以及

https://secure.peakmedia.at/studio/img/thumbnails/original/Gewalt-910.jpg

UsingPicasso

String path="/mnt/sdcard/peakmedia/201411031235020952.jpg";
        path=path.replaceAll(" ", "\\ ");
        Uri uri = Uri.fromFile(new File(path));
        Picasso.with(TestActivity.this).load(uri).config(Config.RGB_565).into(imageview);

TestActivity.java

public class TestActivity extends Activity {


    ImageView imageview;

     int nwidth;
     int nheight;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_progress);

        DisplayMetrics metrics=this.getResources().getDisplayMetrics();
        nwidth=metrics.widthPixels;
        nheight=metrics.heightPixels;

        new SetImage().execute("/mnt/sdcard/peakmedia/201411031235020952.jpg");

    }


    public static Bitmap loadnewresize( String filename, int width, int height, boolean exact){

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filename,options);
        options.inSampleSize = calculateInSampleSize(options, width, height);
        options.inJustDecodeBounds = false;
        options.inPreferredConfig = Config.RGB_565;
        options.inDither = true;
        return BitmapFactory.decodeFile(filename,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;
}

    private class SetImage extends  AsyncTask<String, Void, Bitmap> {

        @Override
        protected Bitmap doInBackground(String... params) {
            Bitmap bitmap=loadnewresize(params[0], nwidth, nheight, false);
            return bitmap ;
        }

        @Override
        protected void onPostExecute(Bitmap result) {

            imageview.setImageBitmap(result);

        }

}

Answer 1

为了更好的表现;如果您阅读Koush在G +上发布的this帖子，您将获得清晰的解决方案，我已经提出了这个问题的总结，因为Android-Universal-Image-Loader是您需求的赢家！

Picasso 拥有最好的图片API！
UrlImageViewHelper + AndroidAsync 是最快的。玩这些其他两个很棒的库真的突出了图像API 但是，已经过时了。
Volley 是光滑的;我非常喜欢他们的可插拔后端传输，
并可能最终放弃AndroidAsync。请求优先权
和取消管理很棒（如果你使用网络）
Android-Universal-Image-Loader 是最受欢迎的人之一目前。高度可定制。

该项目旨在为异步提供可重复使用的仪器图像加载，缓存和显示。它最初基于Fedor Vlasov的项目自那以后经过了大量的重构和改进然后

考虑所有这些Android-Universal-Image-Loader套件您的要求（将图像加载到本地磁盘上）！

加载大尺寸图片给Android机器人堆？

1 个答案: