从URL保存图片到SD卡 [英] Save image from url to sdcard

问题描述

我是从网址保存图像到SD卡。但是，图像尺寸为SD卡0。图像在SD卡创建，但现在检索URL数据和保存。所以这是给我0的大小。

 尝试
   {
     网址URL =新的URL（http://api.androidhive.info/images/sample.jpg）;
      输入的InputStream = url.openStream（）;
      尝试{
          //该SD卡目录例如'/ SD卡，可直接使用，或
          //与getExternalStorageDirectory更安全抽象（）
          文件storagePath = Environment.getExternalStorageDirectory（）;
          OutputStream的输出=新的FileOutputStream（新文件（storagePath，用户名+PNG））;
          尝试{
              字节[]缓冲区=新的字节[2048];
              INT读取动作= 0;
              而（（读取动作= input.read（缓冲液，0，buffer.length））GT; = 0）{
                  output.write（缓冲液，0，读取动作）;
              }
          } {最后
              output.close（）;
          }
      } {最后
          input.close（）;
      }
     }赶上（例外五）
     {
         的System.out.println（错误SD卡+ e.toString（））;
     }
 

解决方案

试试这个code.It作品...

您应该有互联网的权限和写入外部存储设备。

 尝试
{
  网址URL =新的URL（中输​​入网址，下载）;
  HttpURLConnection类的URLConnection =（HttpURLConnection类）url.openConnection（）;
  urlConnection.setRequestMethod（GET）;
  urlConnection.setDoOutput（真）;
  urlConnection.connect（）;
  文件SDCardRoot = Environment.getExternalStorageDirectory（）getAbsoluteFile（）。
  字符串文件名=downloadedFile.png;
  Log.i（本地文件名：，+文件名）;
  档案文件=新的文件（SDCardRoot，文件名）;
  如果（file.createNewFile（））
  {
    file.createNewFile（）;
  }
  FileOutputStream中fileOutput =新的FileOutputStream（文件）;
  为InputStream的InputStream = urlConnection.getInputStream（）;
  INT总计TOTALSIZE = urlConnection.getContentLength（）;
  INT downloadedSize = 0;
  字节[]缓冲区=新的字节[1024];
  INT BufferLength中= 0;
  而（量（bufferLength = inputStream.read（缓冲液））大于0）
  {
    fileOutput.write（缓冲液，0，BufferLength中）;
    downloadedSize + = BufferLength中;
    Log.i（进步，downloadedSize：+ downloadedSize +总计TOTALSIZE：+总计TOTALSIZE）;
  }
  fileOutput.close（）;
  如果（downloadedSize ==总计TOTALSIZE）文件路径= file.getPath（）;
}
赶上（MalformedURLException的E）
{
  e.printStackTrace（）;
}
赶上（IOException异常E）
{
  文件路径= NULL;
  e.printStackTrace（）;
}
Log.i（文件路径：，+文件路径）;
返回文件路径;
 

I am saving image from url to sdcard. But image size is 0 in sdcard. Image is created in sdcard but now retrieve data from url and save. so it is giving me 0 size.

try
   {
     URL url = new URL("http://api.androidhive.info/images/sample.jpg");
      InputStream input = url.openStream();
      try {
          //The sdcard directory e.g. '/sdcard' can be used directly, or 
          //more safely abstracted with getExternalStorageDirectory()
          File storagePath = Environment.getExternalStorageDirectory();
          OutputStream output = new FileOutputStream (new File(storagePath,username+".png"));
          try {
              byte[] buffer = new byte[2048];
              int bytesRead = 0;
              while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
                  output.write(buffer, 0, bytesRead);
              }
          } finally {
              output.close();
          }
      } finally {
          input.close();
      }
     } catch(Exception e)
     {
         System.out.println("error in sd card "+e.toString());
     } 

解决方案

Try this code.It works...

You should have permission of internet and write external storage.

try
{   
  URL url = new URL("Enter the URL to be downloaded");
  HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
  urlConnection.setRequestMethod("GET");
  urlConnection.setDoOutput(true);                   
  urlConnection.connect();                  
  File SDCardRoot = Environment.getExternalStorageDirectory().getAbsoluteFile();
  String filename="downloadedFile.png";   
  Log.i("Local filename:",""+filename);
  File file = new File(SDCardRoot,filename);
  if(file.createNewFile())
  {
    file.createNewFile();
  }                 
  FileOutputStream fileOutput = new FileOutputStream(file);
  InputStream inputStream = urlConnection.getInputStream();
  int totalSize = urlConnection.getContentLength();
  int downloadedSize = 0;   
  byte[] buffer = new byte[1024];
  int bufferLength = 0;
  while ( (bufferLength = inputStream.read(buffer)) > 0 ) 
  {                 
    fileOutput.write(buffer, 0, bufferLength);                  
    downloadedSize += bufferLength;                 
    Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ;
  }             
  fileOutput.close();
  if(downloadedSize==totalSize) filepath=file.getPath();    
} 
catch (MalformedURLException e) 
{
  e.printStackTrace();
} 
catch (IOException e)
{
  filepath=null;
  e.printStackTrace();
}
Log.i("filepath:"," "+filepath) ;
return filepath;

这篇关于从URL保存图片到SD卡的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！