Android Open Source - MyCloud Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.twlkyao.filecloud;
/*  w w w.  ja v a  2 s  . c  o m*/
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.webkit.URLUtil;
import android.widget.Button;
import android.widget.TextView;

/**
 * Upload file to the cloud and download the file from the cloud
 * @author Shiyao Qi
 */
public class MainActivity extends Activity {

  private String cloudUrl; // The url of the cloud
  
  private TextView uploadTextView; // The upload textview for upload url.
  private TextView downloadTextView; // The download textview for download url.
  
  private String uploadUrl; // The upload url string.
  private String downloadUrl; // The download url string.
  
  private Button btn_upload; // The upload button.
  private Button btn_download; // The download button.
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    findViews(); // Find the views for use.
    setListeners(); // Set the listeners.
  }

  /**
   * Find the views by id.
   */
  public void findViews() {
    uploadTextView = (TextView) this.findViewById(R.id.upload_url);
    downloadTextView = (TextView) this.findViewById(R.id.download_url);
    
    btn_upload = (Button) this.findViewById(R.id.btn_upload);
    btn_download = (Button) this.findViewById(R.id.btn_download);
  }

  public void setListeners() {
    btn_upload.setOnClickListener(new View.OnClickListener() {
      
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        uploadUrl = uploadTextView.getText().toString(); // Get the url of the local file.
      }
    });
    
    btn_download.setOnClickListener(new View.OnClickListener() {
      
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        
      }
    });
  }
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  
  /**
   * Upload the file to specified url.
   * @param strUplodFileUrl The url of the file storage server.
   * @param filepath The filepath of the local file.
   * @param username The username on the storage server.
   * @param password The password for the user.
   * @return The upload status.
   */
  public boolean uploadFile(String strUploadFileUrl, String filepath, String username, String password) {
    
    boolean status = false; // Indicate the upload status
    
    String end = "\r\n";  
    String twoHyphens = "--";  
    String boundary = "******";  
    try 
    {
      URL url = new URL(strUploadFileUrl); // Construct a url
      HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); // Open a connection  
      // Set the size of the stream in case it failed due to the small memory
      // This method use the without buffering HTTP stream to request the content without known the size
          httpURLConnection.setChunkedStreamingMode(128 * 1024);// The size of the stream is 128K
          
          // Set the inputstream and outputstream
          httpURLConnection.setDoInput(true); // Allow input
          httpURLConnection.setDoOutput(true); // Allow output
          httpURLConnection.setUseCaches(false); // Do not use cache
          
          // Use the HTTP post method
          httpURLConnection.setRequestMethod("POST");  
          httpURLConnection.setRequestProperty("Connection", "Keep-Alive");  
          httpURLConnection.setRequestProperty("Charset", "UTF-8");  
          httpURLConnection.setRequestProperty("Content-Type",  
              "multipart/form-data;boundary=" + boundary);  
      
          DataOutputStream dos = new DataOutputStream(  
              httpURLConnection.getOutputStream());  
          dos.writeBytes(twoHyphens + boundary + end);  
          dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""  
              + filepath.substring(filepath.lastIndexOf("/") + 1)  
              + "\""  
              + end);  
          dos.writeBytes(end);  
      
          FileInputStream fis = new FileInputStream(filepath);  
          byte[] buffer = new byte[8192]; // 8k  
          int count = 0;  
          // ??????  
          while ((count = fis.read(buffer)) != -1)  
          {  
            dos.write(buffer, 0, count);  
          }  
          fis.close();  
      
          dos.writeBytes(end);  
          dos.writeBytes(twoHyphens + boundary + twoHyphens + end);  
          dos.flush();  
      
          InputStream is = httpURLConnection.getInputStream();  
          InputStreamReader isr = new InputStreamReader(is, "utf-8");  
          BufferedReader br = new BufferedReader(isr);  
          String result = br.readLine();
          
          System.out.println("result:" + result);
      
//          Toast.makeText(this, result, Toast.LENGTH_LONG).show();  
          dos.close();  
          is.close();  
          status = true;
      
        } catch (Exception e)  
        {  
          e.printStackTrace();  
        }
      return status;  
  }
  
  /**
   * Download file from the specified url.
   * @param strDownloadFileUrl The url of the file storage server.
   * @param filepath The filepath of the downloaded file to save.
   * @param username The username on the storage server.
   * @param password The password for the user.
   * @return The download status.
   */
  public boolean downloadFile(String strDownloadFileUrl, String filepath, String username, String password) {
    boolean status = false; // Indicate the download status.
    String message = ""; // To record the related message for the function.
    if(!URLUtil.isNetworkUrl(strDownloadFileUrl)) { // The url of the server is error.
      message += "Wrong url";
    } else { // The url of the server is correct.
      try {
        URL url = new URL(strDownloadFileUrl); // Construct a url.
        URLConnection conn = url.openConnection(); // Open a connection.
        conn.connect();
        
        InputStream is = conn.getInputStream(); // Get an InputStream instance to download file.
        if(null == is) {
          throw new RuntimeException("stream is null");
        } 
        
        File file = new File(Environment.getExternalStorageDirectory() + filepath); // Construct a file according to the filepath.
        
//        String tempFilePath = file.getAbsolutePath(); // Get the temporary filepath.
        
        FileOutputStream fos = new FileOutputStream(file); // Construct a FileOutputStream to write file.
        byte buffer[] = new byte[1024]; // File write buffer.
        
        while(-1 != is.read(buffer)) { // Read to the buffer.
          fos.write(buffer); // Write to the file.
        }
        /*do {
          int read = is.read(buffer); // Read the file into buffer
          if(read < 0) {
            break;
          }
          fos.write(buffer, 0 ,read);
        } while(true);*/
        
        is.close(); // Close the InputStream when the writing is done.
        
      } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } 
    }
    
    return true;
  }
}

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