如何在Android中将图像复制到SD卡

Question

如何将歌曲或图像复制到SD卡上。即下载图像并保存到Android中的SD卡。

感谢，SHIV

Answer 1

File sdCard = Environment.getExternalStorageDirectory(); 
File dir = new File (sdcard.getAbsolutePath() + "/dir1/dir2"); 
dir.mkdirs(); 
File file = new File(dir, "filename"); 

FileOutputStream f = new FileOutputStream(file); 

不要忘了添加权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

Answer 2

private final String PATH = "/data/data/com.whatever.whatever/"; //put the downloaded file here 


public void DownloadFromUrl(String imageURL, String fileName) { //this is the downloader method 
     try { 
       URL url = new URL("http://yoursite.com/" + imageURL); //you can write here any link 
       File file = new File(fileName); 

       long startTime = System.currentTimeMillis(); 
       Log.d("ImageManager", "download begining"); 
       Log.d("ImageManager", "download url:" + url); 
       Log.d("ImageManager", "downloaded file name:" + fileName); 
       /* Open a connection to that URL. */ 
       URLConnection ucon = url.openConnection(); 

       /* 
       * Define InputStreams to read from the URLConnection. 
       */ 
       InputStream is = ucon.getInputStream(); 
       BufferedInputStream bis = new BufferedInputStream(is); 

       /* 
       * Read bytes to the Buffer until there is nothing more to read(-1). 
       */ 
       ByteArrayBuffer baf = new ByteArrayBuffer(50); 
       int current = 0; 
       while ((current = bis.read()) != -1) { 
         baf.append((byte) current); 
       } 

       /* Convert the Bytes read to a String. */ 
       FileOutputStream fos = new FileOutputStream(file); 
       fos.write(baf.toByteArray()); 
       fos.close(); 
       Log.d("ImageManager", "download ready in" 
           + ((System.currentTimeMillis() - startTime)/1000) 
           + " sec"); 

     } catch (IOException e) { 
       Log.d("ImageManager", "Error: " + e); 
     } 

} 

而且不要忘记添加以下权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> 
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission> 

Answer 3

File path = Environment.getExternalStoragePublicDirectory(
     Environment.DIRECTORY_PICTURES); 
File file = new File(path, "DemoPicture.jpg"); 

try { 
    // Make sure the Pictures directory exists. 
    path.mkdirs(); 

    // Very simple code to copy a picture from the application's 
    // resource into the external file. Note that this code does 
    // no error checking, and assumes the picture is small (does not 
    // try to copy it in chunks). Note that if external storage is 
    // not currently mounted this will silently fail. 

    InputStream is = //Input stream of the file downloaded; 
    OutputStream os = new FileOutputStream(file); 
    byte[] data = new byte[is.available()]; 
    is.read(data); 
    os.write(data); 
    is.close(); 
    os.close(); 

    // Tell the media scanner about the new file so that it is 
    // immediately available to the user. 
    MediaScannerConnection.scanFile(this, 
      new String[] { file.toString() }, null, 
      new MediaScannerConnection.OnScanCompletedListener() { 
     public void onScanCompleted(String path, Uri uri) { 
      Log.i("ExternalStorage", "Scanned " + path + ":"); 
      Log.i("ExternalStorage", "-> uri=" + uri); 
     } 
    }); 
} catch (IOException e) { 
    // Unable to create file, likely because external storage is 
    // not currently mounted. 
    Log.w("ExternalStorage", "Error writing " + file, e); 
} 

Answer 4

试试这个代码：

File src = new File(Your_current_file); 
File dest = new File(destination_place); 

    public void copyFile(File src, File dest) throws IOException 
    { 
     InputStream in = new FileInputStream(src); 
     OutputStream out = new FileOutputStream(dest); 

    // Transfer bytes from in to out 
    byte[] buf = new byte[1024]; 
    int len; 
    while ((len = in.read(buf)) > 0) 
    { 
     out.write(buf, 0, len); 
    } 
    in.close(); 
    out.close(); 
    } 

确保提供用于外部存储设备的权限，如果你需要：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> 

希望这将帮助你。