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我想将图像从 SD 卡上传到服务器。所以我对后端代码有想法，即如何上传文件。但我想知道我将如何让用户从他的设备中选择图像以将其上传到服务器。我如何创建此应用程序的 UI 以要求用户选择图像并上传它？请帮助我我是安卓新手。图片上传逻辑就像：我得到了我正在使用此代码的解决方案......

  public class DialogFile extends Activity {
    FileDialog fileDialog = null;
    static String fileName="";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.onCreate(savedInstanceState);
        File mPath = new File(Environment.getExternalStorageDirectory() + "//Gaurav-Test//");
        fileDialog = new FileDialog(this, mPath);
        fileDialog.setFileEndsWith(".txt");
        fileDialog.addFileListener(new FileDialog.FileSelectedListener() {
            public void fileSelected(File file) {
                fileName = file.toString();
                Log.d(getClass().getName(), "selected file " + file.toString());
                UploadToServer uploadObj = new UploadToServer();
                try {
                    uploadObj.execute().get();
                } catch (InterruptedException e) {
                    Log.d("InterruptedException", e.getMessage());
                    e.printStackTrace();
                } catch (ExecutionException e) {
                    Log.d("ExecutionException", e.getMessage());
                    e.printStackTrace();
                }
            }
        });
       fileDialog.showDialog();
    }

然后在文件 FileDilaog.java

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Environment;
import android.util.Log;


public class FileDialog {
    private static final String PARENT_DIR = "..";
    private final String TAG = getClass().getName();
    private String[] fileList;
    private File currentPath;
    public interface FileSelectedListener {
        void fileSelected(File file);
    }
    public interface DirectorySelectedListener {
        void directorySelected(File directory);
    }
    private ListenerList<FileSelectedListener> fileListenerList = new ListenerList<FileDialog.FileSelectedListener>();
    private ListenerList<DirectorySelectedListener> dirListenerList = new ListenerList<FileDialog.DirectorySelectedListener>();
    private final Activity activity;
    private boolean selectDirectoryOption;
    private String fileEndsWith;    

    /**
     * @param activity 
     * @param initialPath
     */
    public FileDialog(Activity activity, File path) {
        this.activity = activity;
        if (!path.exists()) path = Environment.getExternalStorageDirectory();
        loadFileList(path);
    }

    /**
     * @return file dialog
     */
    public Dialog createFileDialog() {
        Dialog dialog = null;
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);

        builder.setTitle(currentPath.getPath());
        if (selectDirectoryOption) {
            builder.setPositiveButton("Select directory", new OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d(TAG, currentPath.getPath());
                    fireDirectorySelectedEvent(currentPath);
                }
            });
        }

        builder.setItems(fileList, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                String fileChosen = fileList[which];
                File chosenFile = getChosenFile(fileChosen);
                if (chosenFile.isDirectory()) {
                    loadFileList(chosenFile);
                    dialog.cancel();
                    dialog.dismiss();
                    showDialog();
                } else fireFileSelectedEvent(chosenFile);
            }
        });

        dialog = builder.show();
        return dialog;
    }


    public void addFileListener(FileSelectedListener listener) {
        fileListenerList.add(listener);
    }

    public void removeFileListener(FileSelectedListener listener) {
        fileListenerList.remove(listener);
    }

    public void setSelectDirectoryOption(boolean selectDirectoryOption) {
        this.selectDirectoryOption = selectDirectoryOption;
    }

    public void addDirectoryListener(DirectorySelectedListener listener) {
        dirListenerList.add(listener);
    }

    public void removeDirectoryListener(DirectorySelectedListener listener) {
        dirListenerList.remove(listener);
    }

    /**
     * Show file dialog
     */
    public void showDialog() {
        createFileDialog().show();
    }

    private void fireFileSelectedEvent(final File file) {
        fileListenerList.fireEvent(new FireHandler<FileDialog.FileSelectedListener>() {
            public void fireEvent(FileSelectedListener listener) {
                listener.fileSelected(file);
            }
        });
    }

    private void fireDirectorySelectedEvent(final File directory) {
        dirListenerList.fireEvent(new FireHandler<FileDialog.DirectorySelectedListener>() {
            public void fireEvent(DirectorySelectedListener listener) {
                listener.directorySelected(directory);
            }
        });
    }

    private void loadFileList(File path) {
        this.currentPath = path;
        List<String> r = new ArrayList<String>();
        if (path.exists()) {
            if (path.getParentFile() != null) r.add(PARENT_DIR);
            FilenameFilter filter = new FilenameFilter() {
                public boolean accept(File dir, String filename) {
                    File sel = new File(dir, filename);
                    if (!sel.canRead()) return false;
                    if (selectDirectoryOption) return sel.isDirectory();
                    else {
                        boolean endsWith = fileEndsWith != null ? filename.toLowerCase().endsWith(fileEndsWith) : true;
                        return endsWith || sel.isDirectory();
                    }
                }
            };
            String[] fileList1 = path.list(filter);
            for (String file : fileList1) {
                r.add(file);
            }
        }
        fileList = (String[]) r.toArray(new String[]{});
    }

    private File getChosenFile(String fileChosen) {
        if (fileChosen.equals(PARENT_DIR)) return currentPath.getParentFile();
        else return new File(currentPath, fileChosen);
    }

    public void setFileEndsWith(String fileEndsWith) {
        this.fileEndsWith = fileEndsWith != null ? fileEndsWith.toLowerCase() : fileEndsWith;
    }
 }

class ListenerList<L> {
private List<L> listenerList = new ArrayList<L>();

public interface FireHandler<L> {
    void fireEvent(L listener);
}

public void add(L listener) {
    listenerList.add(listener);
}

public void fireEvent(FireHandler<L> fireHandler) {
    List<L> copy = new ArrayList<L>(listenerList);
    for (L l : copy) {
        fireHandler.fireEvent(l);
    }
}

public void remove(L listener) {
    listenerList.remove(listener);
}

public List<L> getListenerList() {
    return listenerList;
}
}

然后将 HTTPOST 代码上传到服务器

import java.io.File;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.os.AsyncTask;
import android.util.Log;


public class UploadToServer extends AsyncTask<String, String, String>{
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... aurl){
        String status="";
        final String URL= "";
        Log.d("Image Path ======",DialogFile.fileName);
        try{

        HttpClient httpclient = new DefaultHttpClient();

         HttpPost httppost = new HttpPost(URL);

         File file = new File(DialogFile.fileName);
         FileBody bin = new FileBody(file);
         MultipartEntity reqEntity = new MultipartEntity();
         reqEntity.addPart("userImage", bin);
         httppost.setEntity(reqEntity);
         Log.d("executing request ",  httppost.getRequestLine().toString());
         HttpResponse response = httpclient.execute(httppost);
         HttpEntity resEntity = response.getEntity();

         if (resEntity != null)
         {
            Log.d("Response content length: ",resEntity.getContentLength()+"");
             if(resEntity.getContentLength()>0)
             {
                status= EntityUtils.toString(resEntity);
             }
             else
             {
                 status= "No Response from Server";
                 Log.d("Status----->",status);
             }
     }
     else
     {
          status= "No Response from Server";
          Log.d("Status----->",status);
     }
        } catch (Exception e) {
                e.printStackTrace();
                status="Unable to connect with iPerform server";
            }
            return status;
        }
}
4

3 回答 3

0

你可以检查这个答案 https://stackoverflow.com/a/3645048/984466

或使用自定义文件对话框，例如 https://code.google.com/p/android-file-dialog/

于 2013-07-04T06:20:31.350 回答
0

尝试这个：

Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("return-data", true);
startActivityForResult(intent, 1);

然后这段代码是设置从图库中选择的图像。使用 onActivityResult 方法从图库中获取结果：

   @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case 1:
                Uri _uri = data.getData();
                String yourimagepath = getRealPathFromURI(_uri);
                ...
                // your code goes here
    }
    super.onActivityResult(requestCode, resultCode, data);
}

public String getRealPathFromURI(Uri contentUri) {
        String[] proj = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(contentUri, proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
}

希望它有所帮助。

于 2013-07-04T06:23:39.380 回答
0

此代码将帮助您：

    String boundary = "---------------------------14737809831466499882746641449";
    String lineEnd = "\r\n", p;
    String twoHyphens = "--";
    HttpURLConnection conn;
    DataOutputStream dos = null;
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;
    DataInputStream inStream;
    File sourceFile;
    ArrayList<String> tempList = new ArrayList<String>();

    String exsistingFileName = Environment.getExternalStorageDirectory()
        .getAbsolutePath() + "/PiyushAushFish";



    try {

        File f = new File(exsistingFileName);

        File[] files = f.listFiles();

        for (int i = 0; i < files.length; i++) {
            File file = files[i];

            tempList.add(file.getPath());
            Log.v("Existing", exsistingFileName);
        }

        // tempList.add(exsistingFileName);
        // tempList.add(FileName);

        if (isUploaded) {

            URL url = new URL(
                    "You URL here");
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type",
                    "text/plain; charset=utf-8");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Content-Type",
                    "multipart/form-data; boundary=" + boundary);
            for (int i = 0; i < tempList.size(); i++) {
                Log.v("Length", tempList.size() + "");
                sourceFile = new File(tempList.get(i));
                FileInputStream fileInputStream = new FileInputStream(
                        sourceFile);
                Log.v("IMAGPATH", sourceFile + "");
                dos = new DataOutputStream(conn.getOutputStream());
                dos.writeBytes(lineEnd + twoHyphens + boundary + lineEnd);

                System.out
                        .println("==========================image name================="
                                + sourceFile);
                dos.writeBytes("Content-Disposition: form-data; name=\"image[]\"; filename=\""
                        + sourceFile + "\"" + lineEnd);
                dos.writeBytes("Content-Type: application/octet-stream"
                        + lineEnd + lineEnd);
                System.out
                        .println("=============================data writin start================");
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                buffer = new byte[bufferSize];
                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);
                    System.out
                            .println("==============================bytesRead==========================="
                                    + bytesRead);
                }

                dos.writeBytes(lineEnd + twoHyphens + boundary + twoHyphens
                        + lineEnd);
                fileInputStream.close();

            }

            dos.flush();
            dos.close();

        } else {
            Log.v("Error.....", "No Data");
        }

    } catch (Exception e) {
        // TODO Auto-generated catch block
        Log.d("Error--------->", e.getMessage());
        e.printStackTrace();
    }
    try {
        inStream = new DataInputStream(conn.getInputStream());
        String str;
        while ((str = inStream.readLine()) != null) {
            Log.e("Debug", "Server Response " + str);

        }
        inStream.close();

        int serverResponseCode = conn.getResponseCode();
        String serverResponseMessage = conn.getResponseMessage();
        Log.e("server response codde", "" + serverResponseCode);
        Log.i("uploadFile", "HTTP Response is : " + serverResponseMessage
                + ": " + serverResponseCode);
        if (serverResponseCode == 200) {

            isUploaded = true;
            // isUploaded = (c.getInt(23) == 1);

            Log.v("Upload", "Successfully");

        }

    } catch (IOException ioex) {
        Log.e("Debug", "error: " + ioex.getMessage(), ioex);
    }
于 2013-07-04T06:24:52.203 回答