Question

我需要将高分辨率远程图像加载到imageview，但不使用任何外部库或框架。图像类似于2150x1500像素，这是我的加载代码：

                URL imageUrl = new URL(url);

                HttpURLConnection connection;
                if (url.startsWith("https://")) {
                    connection = (HttpURLConnection) imageUrl.openConnection();
                } else {
                    connection = (HttpURLConnection) imageUrl.openConnection();
                }
                connection.setConnectTimeout(30000);
                connection.setReadTimeout(30000);
                connection.setInstanceFollowRedirects(true);

                InputStream is = connection.getInputStream();                               
                OutputStream os = new FileOutputStream(f);
                CacheUtils.CopyStream(is, os);
                os.close();
                image = decodeFile(f);
                img.setImageBitmap(image);

这里是decodeFile函数：

return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);

我总是得到纹理大小太大的异常。有没有办法加载这些图像？或者有没有办法调整图像大小2或4次，但调整大小以适应2048像素宽？

Answer 1

class DownloadImage extends AsyncTask<String, Void, Bitmap> 
{
    ImageView bmImage;

    public DownloadImage(ImageView bmImage) {
        this.bmImage = bmImage;
    }
    @Override
    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }
    @Override
    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(Bitmap.createScaledBitmap(result, 120, 120, false));
    }
}

指定所需的高度和宽度，而不是120。

在你的oncreate中调用它

new DownloadImage((ImageView) findViewById(R.id.imageView1))
                .execute("https://.........");

将大于2048x2048的图像加载到Android上的ImageView中

1 个答案: