Question

我必须从httpResponse下载图像并将其保存在Android设备上的内部存储中。我有这段代码试图这样做：

HttpResponse httpResponse = httpClient.execute(httpPost);

InputStream inputStream = httpResponse.getEntity().getContent();

Bitmap logo = BitmapFactory.decodeStream(inputStream);

FileOutputStream fos = null;
try {
    fos = getApplicationContext().openFileOutput("logo.png",Context.MODE_PRIVATE);

    logo.compress(Bitmap.CompressFormat.PNG, 90, fos);

} catch (FileNotFoundException e) {
    e.printStackTrace();
} finally {
    fos.close();
}

但我没有得到我需要的结果。保存的图像无法与图像查看器一起打开，而且其尺寸也略大。要下载的图像是1.71 KB，结果是2.01 KB。任何想法？

Answer 1

我不知道您的代码中存在什么问题，但如果您愿意，可以尝试使用此代码，此代码对我来说没有任何问题

保存到内部存储器......

   File fileWithinMyDir = getApplicationContext().getFilesDir();  
    try 
          {
              StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
              .permitAll().build();
          StrictMode.setThreadPolicy(policy); 
           URL url = new URL("http://t2.gstatic.com  /images?q=tbn:ANd9GcQjZgUffqqe2mKKb5VOrDNd-ZxD7sJOU7WAHlFAy6PLbtXpyQZYdw");
           File file = new File( fileWithinMyDir.getAbsolutePath()  + "/" +"sun.jpg");
           URLConnection ucon = url.openConnection();
           InputStream is = ucon.getInputStream();
           BufferedInputStream bis = new BufferedInputStream(is);
           ByteArrayBuffer baf = new ByteArrayBuffer(50);
           int current = 0;
           while ((current = bis.read()) != -1) 
           {
            baf.append((byte) current);
           }

           FileOutputStream fos = new FileOutputStream(file);
           fos.write(baf.toByteArray());
           fos.close();
        } 
        catch (IOException e) 
        {
            Log.e("download", e.getMessage());
        }

从内存中加载图像..

 StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
          .permitAll().build();
           StrictMode.setThreadPolicy(policy); 
          mImgView1 = (ImageView) findViewById(R.id.mImgView1); 

          Bitmap bitmap = BitmapFactory.decodeFile(fileWithinMyDir.getAbsolutePath()  + "/" +"sunn"+".file extension");
          mImgView1.setImageBitmap(bitmap);

从httpResponse保存图像

1 个答案: