通过从SD卡或文件管理中随机选择图像，将Android图像上传到PHP服务器

public class MainActivity extends Activity {
Button b,b1;
TextView messageText;
String upLoadServerUri = null;
 private static final int SELECT_PICTURE = 1;
 private String selectedImagePath;
 int serverResponseCode = 0;
    ProgressDialog dialog = null;
 //   String selectedPath = "/mnt/sdcard/";
// private ImageView img;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      //  img = (ImageView)findViewById(R.id.imageView1);
        messageText=(TextView)findViewById(R.id.textView1);
        b=(Button)findViewById(R.id.button1);
        b1=(Button)findViewById(R.id.button2);
        upLoadServerUri = "http://localhost/picture_upload.php";
        b.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                 Intent intent = new Intent();
                 intent.setType("image/*");
                 intent.setAction(Intent.ACTION_GET_CONTENT);
                 startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
            }
        });
        b1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                dialog = ProgressDialog.show(MainActivity.this, "", "Uploading file...", true);
                new Thread(new Runnable() {
                        public void run() {
                             runOnUiThread(new Runnable() {
                                    public void run() {
                                        messageText.setText("uploading started.....");
                                    }
                                });                      
                             uploadFile(selectedImagePath);
                        }
                      }).start();        
                }
            });

    }
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
                System.out.println("Image Path : " + selectedImagePath);
               // img.setImageURI(selectedImageUri);
                //uploadFile(selectedImagePath);
            }
        }
    }
    public int uploadFile(String sourceFileUri) {

          String fileName = sourceFileUri;
          HttpURLConnection conn = null;
          DataOutputStream dos = null;  
          String lineEnd = "'r'n";
          String twoHyphens = "--";
          String boundary = "*****";
          int bytesRead, bytesAvailable, bufferSize;
          byte[] buffer;
          int maxBufferSize = 1 * 1024 * 1024; 
          File sourceFile = new File(sourceFileUri); 
          if (!sourceFile.isFile()) {
               dialog.dismiss(); 
               Log.e("uploadFile", "Source File not exist :"
                                   +selectedImagePath);
               runOnUiThread(new Runnable() {
                   public void run() {
                       messageText.setText("Source File not exist :"
                               +selectedImagePath);
                   }
               }); 
               return 0;
          }
          else
          {
               try { 
                     // open a URL connection to the Servlet
                   FileInputStream fileInputStream = new FileInputStream(sourceFile);
                   URL url = new URL(upLoadServerUri);
                   // Open a HTTP  connection to  the URL
                   conn = (HttpURLConnection) url.openConnection(); 
                   conn.setDoInput(true); // Allow Inputs
                   conn.setDoOutput(true); // Allow Outputs
                   conn.setUseCaches(false); // Don't use a Cached Copy
                   conn.setRequestMethod("POST");
                   conn.setRequestProperty("Connection", "Keep-Alive");
                   conn.setRequestProperty("ENCTYPE", "multipart/form-data");
                   conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
                   conn.setRequestProperty("uploaded_file", fileName); 
                   dos = new DataOutputStream(conn.getOutputStream());
                   dos.writeBytes(twoHyphens + boundary + lineEnd); 
                   dos.writeBytes("Content-Disposition: form-data; name='"uploaded_file'";filename='""
                                             + fileName + "'"" + lineEnd);
                   dos.writeBytes(lineEnd);
                   // create a buffer of  maximum size
                   bytesAvailable = fileInputStream.available(); 
                   bufferSize = Math.min(bytesAvailable, maxBufferSize);
                   buffer = new byte[bufferSize];
                   // read file and write it into form...
                   bytesRead = fileInputStream.read(buffer, 0, bufferSize);  
                   while (bytesRead > 0) {
                     dos.write(buffer, 0, bufferSize);
                     bytesAvailable = fileInputStream.available();
                     bufferSize = Math.min(bytesAvailable, maxBufferSize);
                     bytesRead = fileInputStream.read(buffer, 0, bufferSize);   
                    }
                   // send multipart form data necesssary after file data...
                   dos.writeBytes(lineEnd);
                   dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
                   // Responses from the server (code and message)
                   serverResponseCode = conn.getResponseCode();
                   String serverResponseMessage = conn.getResponseMessage();
                   Log.i("uploadFile", "HTTP Response is : " 
                           + serverResponseMessage + ": " + serverResponseCode);
                   if(serverResponseCode == 200){
                       runOnUiThread(new Runnable() {
                            public void run() {
                                String msg = "File Upload Completed.'n'n See uploaded file here : 'n'n"
                                              +"http://localhost/picture_upload.php";
                                messageText.setText(msg);
                                Toast.makeText(MainActivity.this, "File Upload Complete.", 
                                             Toast.LENGTH_SHORT).show();
                            }
                        });                
                   }    
                   //close the streams //
                   fileInputStream.close();
                   dos.flush();
                   dos.close();
              } catch (MalformedURLException ex) {
                  dialog.dismiss();  
                  ex.printStackTrace();
                  runOnUiThread(new Runnable() {
                      public void run() {
                          messageText.setText("MalformedURLException Exception : check script url.");
                          Toast.makeText(MainActivity.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
                      }
                  });
                  Log.e("Upload file to server", "error: " + ex.getMessage(), ex);  
              } catch (Exception e) {
                  dialog.dismiss();  
                  e.printStackTrace();
                  runOnUiThread(new Runnable() {
                      public void run() {
                          messageText.setText("Got Exception : see logcat ");
                          Toast.makeText(MainActivity.this, "Got Exception : see logcat ", 
                                  Toast.LENGTH_SHORT).show();
                      }
                  });
                  Log.e("Upload file to server Exception", "Exception : " 
                                                   + e.getMessage(), e);  
              }
              dialog.dismiss();       
              return serverResponseCode; 
           } // End else block 
         } 
    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }

}

您需要先获取Sdcard中的所有文件，您可以使用文件过滤器。这是我为返回一个而写的 包含图像的目录列表。由此，应该是 修改它以返回图像列表相当简单：

FileFilter filterForImageFolders = new FileFilter() 
    {            
        public boolean accept(File folder) 
        { 
            try 
            { 
                //Checking only directories, since we are checking for files within 
                //a directory 
                if(folder.isDirectory()) 
                { 
                    File[] listOfFiles = folder.listFiles(); 
                    if (listOfFiles == null) return false; 
                    //For each file in the directory... 
                    for (File file : listOfFiles) 
                    {                            
                        //Check if the extension is one of the supported filetypes                           
                        //imageExtensions is a String[] containing image filetypes (e.g. "png")
                        for (String ext : imageExtensions) 
                        { 
                            if (file.getName().endsWith("." + ext)) return true; 
                        } 
                    }                        
                } 
                return false; 
            } 
            catch (SecurityException e) 
            { 
                Log.v("debug", "Access Denied"); 
                return false; 
            } 
        } 
    };

EDIT: To clarify, to use this, you would do something like the below:
File extStore = Environment.getExternalStorageDirectory();
File[] imageDirs = extStore.listFiles(filterForImageFolders);