Question

请，需要帮助。我有这个错误java.io.FileNotFoundException：http://news.yandex.ru/quotes/1507.png（浏览器可以看到），同时将其保存到我的内部存储中。这是我的方法：

void downloadGraph（String link）{ 试试{

                URL url = new URL(link);
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.setDoOutput(true);
                urlConnection.connect();

                File dbDirectory = new File(mctx.getFilesDir().getAbsolutePath()+ File.separator+"yqimages/");
                if(!dbDirectory.exists())dbDirectory.mkdir();
                String fname=link.substring(link.lastIndexOf("/")+1,link.length());
                File file = new File(dbDirectory, fname);
                FileOutputStream fileOutput = new FileOutputStream(file);
                InputStream inputStream = urlConnection.getInputStream();

                byte[] buffer = new byte[1024];
                int bufferLength;

                while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
                    fileOutput.write(buffer, 0, bufferLength);
                }
                fileOutput.close();
            } catch (final Exception e) {
                e.printStackTrace();
            }
}

你能写一个方法来下载\保存这个特定的图像（如上所示）？任何帮助表示赞赏！得到它！！问题不在代码中，而是在图像https://news.yandex.ru/quotes/1507.png中。由于某些原因，这张图片无法保存，而其他图片则无法保存。它与“httpS：//”有关吗？

Answer 1

// ist put the permission in Manifest.xml hte permission are below
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 
private void saveimage() {
    bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
    String time  = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(System.currentTimeMillis());
    File path  = Environment.getExternalStorageDirectory();
    File dir = new File(path+"/Gallery");
    dir.mkdir();
    String imagename = time+".PNG";
    File file = new File(dir,imagename);
    OutputStream out;
    try {
        out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.PNG,100,out);
        out.flush();
        out.close();
        Toast.makeText(Show_Online.this, "Image Save To Gallery", 
Toast.LENGTH_SHORT).show();
    }
    catch (Exception e){
        Toast.makeText(Show_Online.this, e.getMessage(), Toast.LENGTH_SHORT).show();
    }
}

Answer 2

here解释所有关于在android中下载和保存图像的内容。

并且不要忘记在Menifest中添加读写外部存储器的权限。

通过URL将图像保存到内部存储

2 个答案: