android - 如何将图像存储在Android设备中

Question

我有一组来自服务器的图像。我需要将图像存储在设备中。如何做到这一点。谁能指导我将图像存储在 android 设备中。执行此过程的最佳方法是什么。

提前致谢：）

Answer 1

您可以从 url 下载图像并将其存储在 sd 卡中。每当您想显示图像时，只需加载该图像。这里是这项工作的简单代码。

   private void downloadImagesToSdCard(String downloadUrl,String imageName)
  {
try{
    URL url = new URL(downloadUrl); //you can write here any link

    File myDir =  new File("/sdcard"+"/"+Constants.imageFolder);
    //Something like ("/sdcard/file.mp3")


    if(!myDir.exists()){
        myDir.mkdir();
        Log.v("", "inside mkdir");

    }

    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = imageName;
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 

         /* Open a connection to that URL. */
        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();
      }

        /*
         * Define InputStreams to read from the URLConnection.
         */
       // InputStream is = ucon.getInputStream();
        /*
         * Read bytes to the Buffer until there is nothing more to read(-1).
         */

        FileOutputStream fos = new FileOutputStream(file);
        int size = 1024*1024;
        byte[] buf = new byte[size];
        int byteRead;
        while (((byteRead = inputStream.read(buf)) != -1)) {
            fos.write(buf, 0, byteRead);
            bytesDownloaded += byteRead;
        }
        /* Convert the Bytes read to a String. */

        fos.close();

}catch(IOException io)
{
    networkException = true;
    continueRestore = false;
}
catch(Exception e)
{   
    continueRestore = false;
    e.printStackTrace();
}

}

希望这会帮助你。