Question

我使用 Picasso 下载图片并在我的 Android 应用中显示它，它可以正常工作。现在我想在第一页下载所有图像并在第二页中显示它们。问题是，图像将保存在哪里？我需要路径来下载图片。有没有办法访问路径或更改呢？

Answer 1

您可以使用它们的urrls将图像下载到内部存储上的所需路径，然后只需使用以下两种方法将它们加载到图像视图中：

public void downloadImagesToSdCard(String downloadUrl, String imageName)
 //downloadURL is the url of your image and imageName is the name you choose for your image file on internal storage

{
    try
    {
        URL url = new URL(downloadUrl);
                    /* making a directory in sdcard */
        String sdCard= Environment.getExternalStorageDirectory().toString();
        File myDir = new File(sdCard,"Your Arbitrary Folder Name");

                    /*  if specified not exist create new */
        if(!myDir.exists())
        {
            myDir.mkdir();
            Log.v("", "inside mkdir");
        }

                    /* checks the file and if it already exist delete */
        String fname = imageName;
        File file = new File (myDir, fname);
        if (file.exists ())
            file.delete ();

                         /* Open a connection */
        URLConnection ucon = url.openConnection();
        InputStream inputStream = null;
        HttpURLConnection httpConn = (HttpURLConnection)ucon;
        httpConn.setRequestMethod("GET");
        httpConn.connect();

        if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK)
        {
            inputStream = httpConn.getInputStream();
        }

        FileOutputStream fos = new FileOutputStream(file);
        int totalSize = httpConn.getContentLength();
        int downloadedSize = 0;
        byte[] buffer = new byte[2048];
        int bufferLength = 0;
        while ( (bufferLength = inputStream.read(buffer)) > 0 )
        {
            fos.write(buffer, 0, bufferLength);
            downloadedSize += bufferLength;
            Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ;
        }

        fos.close();
        Log.d("test", "Image Saved in sdcard..");
    }
    catch(IOException io)
    {
        io.printStackTrace();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}`

使用上述方法后，您的图像从输入URL下载到设备的内部存储中的指定文件夹和图像名称（imageName）。然后，您应该将此路径中的图像加载到ImageView。您可以使用以下方法执行此操作：

public Bitmap loadToImageView(ImageView myImage, String sd_address) {
        Bitmap myBitmap = null;
        //File imgFile = new  File("/sdcard/Your Arbitary Folder  Name/matin.jpg");
        File imgFile = new File(sd_address);
        if (imgFile.exists()) {
            myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

            //ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);

            myImage.setImageBitmap(myBitmap);

        }
        return myBitmap;
    }

因此，您的图像使用setImageBitmap方法从指定的sd_address加载到imageview。希望这对你有所帮助！：）

我无法找到毕加索在SD卡中保存图像的地方

1 个答案: