Как передать объект сеанса между действиями Android

Question

Я работаю над проектом, который использует Dropbox Android apis для реализации функций загрузки и загрузки. Первый шаг: я использовал UploadButton триггером fileelectorActivity. Эта функция я использую метод Intent для реализации перехода к следующему действию, но метод умывания не может привести к сеансу Dropbox для другой активности (вероятно, о типе сеанса Dropbox не String). afer выполнил селектор файлов. Активность, которая выберет конкретный путь к файлу для загрузки в Dropbox,

Я хочу знать, как передать сеанс Dropbox на файлы. Выберите ActiveActivity после выбора целевого файла. Используемый метод и пучок используются, но не полезны. Вот мой код.

MainActivity код

public class MainActivity extends Activity implements OnClickListener { 
    private DropboxAPI<AndroidAuthSession> dropbox; 
    private final static String FILE_DIR = "/"; 
    private final static String DROPBOX_NAME = "dropbox_prefs"; 
    private final static String ACCESS_KEY = "***************"; 
    private final static String ACCESS_SECRET = "************"; 
    private String path = "/"; 
    private boolean isLoggedIn; 
    private Button logIn; 
    private Button uploadFile; 
    private Button encryption; 
    private Button decryption; 
    private Button listFiles; 

    private ArrayAdapter<String> listAdapter; 
    private ListView itemlist; 
    ArrayList<String> items = new ArrayList<String>(); 


    @SuppressWarnings("deprecation") 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     logIn = (Button) findViewById(R.id.dropbox_login); 
     logIn.setOnClickListener(this); 
     uploadFile = (Button) findViewById(R.id.UploadButton); 
     uploadFile.setOnClickListener(this); 
     decryption=(Button) findViewById(R.id.decryptionButton); 
     decryption.setOnClickListener(this); 
     encryption=(Button) findViewById(R.id.encryptionButton); 
     encryption.setOnClickListener(this); 
     listFiles = (Button) findViewById(R.id.list_files); 
     listFiles.setOnClickListener(this); 
     // get itemlist 
     itemlist = (ListView) findViewById(R.id.itemList); 

     // encryption(); 
     loggedIn(false); 
     AndroidAuthSession session; 
     AppKeyPair pair = new AppKeyPair(ACCESS_KEY, ACCESS_SECRET); 

     SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0); 
     String key = prefs.getString(ACCESS_KEY, null); 
     String secret = prefs.getString(ACCESS_SECRET, null); 

     if (key != null && secret != null) { 
      AccessTokenPair token = new AccessTokenPair(key, secret); 
      session = new AndroidAuthSession(pair, AccessType.DROPBOX, token); 
     } else { 
      session = new AndroidAuthSession(pair, AccessType.DROPBOX); 
     } 
     dropbox = new DropboxAPI<AndroidAuthSession>(session); 

    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 

     AndroidAuthSession session = dropbox.getSession(); 
     if (session.authenticationSuccessful()) { 
      try { 
       session.finishAuthentication(); 
       TokenPair tokens = session.getAccessTokenPair(); 
       SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0); 
       Editor editor = prefs.edit(); 
       editor.putString(ACCESS_KEY, tokens.key); 
       editor.putString(ACCESS_SECRET, tokens.secret); 
       editor.commit(); 
       loggedIn(true); 
      } catch (IllegalStateException e) { 
       Toast.makeText(this, "Error during Dropbox authentication", 
         Toast.LENGTH_SHORT).show(); 
      } 
     } 
    } 

    public void loggedIn(boolean isLogged) { 
     isLoggedIn = isLogged; 
     uploadFile.setEnabled(isLogged); 
     listFiles.setEnabled(isLogged); 
     decryption.setEnabled(isLogged); 
     encryption.setEnabled(isLogged); 
     logIn.setText(isLogged ? "Log out" : "Log in"); 
    } 

    private final Handler handler = new Handler() { 
     public void handleMessage(Message msg) { 
      items.clear(); 
      ArrayList<String> result = msg.getData().getStringArrayList("data"); 
      for (String fileName : result) { 
       items.add(fileName); 
      } 
      handleitems(); 
     } 

    }; 

    public void handleitems() { 
     listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, items); 
     itemlist.setAdapter(listAdapter); 
     itemlist.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view,int position, long id) { 
       String item = ((TextView) view).getText().toString(); 
       Toast.makeText(getBaseContext(), item, Toast.LENGTH_LONG).show(); 
       DownloadFileFromDropbox download2=new DownloadFileFromDropbox(parent.getContext(), dropbox, path,item); 
       download2.execute(); 
      } 

     }); 
    } 



    @SuppressWarnings("deprecation") 
    @Override 
    public void onClick(View v) { 

     switch (v.getId()) { 
     case R.id.dropbox_login: 
      if (isLoggedIn) { 
       dropbox.getSession().unlink(); 
       loggedIn(false); 
      } else { 
       dropbox.getSession().startAuthentication(MainActivity.this); 
      } 
      break; 
     case R.id.list_files: 
      ListDropboxFiles list = new ListDropboxFiles(dropbox, FILE_DIR,handler); 
      list.execute(); 
      break; 
     case R.id.UploadButton: 
      Intent intent = new Intent(MainActivity.this, FileChooser.class); 
      startActivity(intent); 


     // UploadFileToDropbox uploader=new UploadFileToDropbox(this, dropbox, path); 
     // uploader.execute(); 
      break; 
     default: 
      break; 
     } 
    } 


} 

Fileselector код.

package filechooser; 

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.List; 

import com.dropbox.client2.DropboxAPI; 
import com.dropbox.client2.android.AndroidAuthSession; 
import com.dropbox.client2.exception.DropboxException; 
import com.dropbox.client2.exception.DropboxUnlinkedException; 
import com.example.ik2000dropbox.MainActivity; 
import com.example.ik2000dropbox.R; 
import com.example.ik2000dropbox.UploadFileToDropbox; 

import android.app.ListActivity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.ListView; 
import android.widget.Toast; 

public class FileChooser extends ListActivity { 

    private File currentDir; 
    FileArrayAdapter adapter; 



    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     currentDir = new File("/sdcard/download"); 
     fill(currentDir); 
    } 

    private void fill(File f) { 
     File[] dirs = f.listFiles(); 
     this.setTitle("Current Dir: " + f.getName()); 
     List<Option> dir = new ArrayList<Option>(); 
     List<Option> fls = new ArrayList<Option>(); 
     try { 
      for (File ff : dirs) { 
       if (ff.isDirectory()) 
        dir.add(new Option(ff.getName(), "Folder", ff 
          .getAbsolutePath())); 
       else { 
        fls.add(new Option(ff.getName(), "File Size: " 
          + ff.length(), ff.getAbsolutePath())); 
       } 
      } 
     } catch (Exception e) { 

     } 
     Collections.sort(dir); 
     Collections.sort(fls); 
     dir.addAll(fls); 
     if (!f.getName().equalsIgnoreCase("sdcard")) 
      dir.add(0, new Option("..", "Parent Directory", f.getParent())); 
     adapter = new FileArrayAdapter(FileChooser.this, R.layout.file_view,dir); 
     this.setListAdapter(adapter); 
    } 

    protected void onListItemClick(ListView l, View v, int position, long id) { 

     super.onListItemClick(l, v, position, id); 
     Option o = adapter.getItem(position); 
     if (o.getData().equalsIgnoreCase("folder") 
       || o.getData().equalsIgnoreCase("parent directory")) { 
      currentDir = new File(o.getPath()); 
      fill(currentDir); 
     } else { 

      onFileClick(o); 
     } 
    } 

    private void onFileClick(Option o) { 

     Toast.makeText(this, "File Clicked: " + o.getName(), Toast.LENGTH_SHORT).show(); 

    } 

} 

Моя загрузить активность

public class UploadFileToDropbox extends AsyncTask<Void, Void, Boolean> { 

    private DropboxAPI<?> dropbox; 
    private String path; 
    private Context context; 

    public UploadFileToDropbox(Context context, DropboxAPI<?> dropbox, 
      String path) { 
     this.context = context.getApplicationContext(); 
     this.dropbox = dropbox; 
     this.path = path; 
    } 



    @Override 
    protected Boolean doInBackground(Void... params) { 

     try { 
     File file = new File("/sdcard/download/lecture.pdf.p7m"); 
     FileInputStream inputStream =new FileInputStream(file); 
     dropbox.putFile(path + "lecture.pdf.p7m",inputStream, 
       file.length(), null, null); 
     return true;  

     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     }catch (IOException e) { 
       e.printStackTrace(); 
     } catch (DropboxException e) { 
       e.printStackTrace(); 

     } 

     return false; 
    } 





    @Override 
    protected void onPostExecute(Boolean result) { 
     if (result) { 
      Toast.makeText(context, "File Uploaded Sucesfully!", 
        Toast.LENGTH_LONG).show(); 
     } else { 
      Toast.makeText(context, "Failed to upload file", Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

Answer 1

Создание объекта Application

public class MyApplication extends Application implements Application.ActivityLifecycleCallbacks{ 

      private final static String ACCESS_KEY = "***************"; 
      private final static String ACCESS_SECRET = "************"; 

      private static MyApplication singleton; 
      private DropboxAPI<AndroidAuthSession> dropbox; 

      private final static String DROPBOX_NAME = "dropbox_prefs"; 

      public DropboxAPI<AndroidAuthSession> getDropbox() { 
       return dropbox; 
      } 

      public void setDropbox(DropboxAPI<AndroidAuthSession> dropbox) { 
       this.dropbox = dropbox; 
      } 



      @Override 
      public void onCreate() { 
       super.onCreate(); 
       singleton = this; 
       SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0); 
       String key = prefs.getString(ACCESS_KEY, null); 
       String secret = prefs.getString(ACCESS_SECRET, null); 

       if (key != null && secret != null) { 
        AccessTokenPair token = new AccessTokenPair(key, secret); 
        session = new AndroidAuthSession(pair, AccessType.DROPBOX, token); 
       } else { 
        session = new AndroidAuthSession(pair, AccessType.DROPBOX); 
       } 
       dropbox = new DropboxAPI<AndroidAuthSession>(session); 
      }} 

Добавьте его проявить

<application 
      android:name=".MyApplication" 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher" 
      android:label="@string/app_name" 
      android:theme="@style/AppTheme" > 

Использование в деятельности

MyApplication.getInstance().getDropbox() 

Answer 2

Create Application Object 

public class MyApplication extends Application implements Application.ActivityLifecycleCallbacks{ 

      private final static String ACCESS_KEY = "***************"; 
      private final static String ACCESS_SECRET = "************"; 

      private static MyApplication singleton; 
      private DropboxAPI<AndroidAuthSession> dropbox; 

      private final static String DROPBOX_NAME = "dropbox_prefs"; 

      public DropboxAPI<AndroidAuthSession> getDropbox() { 
       return dropbox; 
      } 

      public void setDropbox(DropboxAPI<AndroidAuthSession> dropbox) { 
       this.dropbox = dropbox; 
      } 



      @Override 
      public void onCreate() { 
       super.onCreate(); 
       singleton = this; 
       SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0); 
       String key = prefs.getString(ACCESS_KEY, null); 
       String secret = prefs.getString(ACCESS_SECRET, null); 

       if (key != null && secret != null) { 
        AccessTokenPair token = new AccessTokenPair(key, secret); 
        session = new AndroidAuthSession(pair, AccessType.DROPBOX, token); 
       } else { 
        session = new AndroidAuthSession(pair, AccessType.DROPBOX); 
       } 
       dropbox = new DropboxAPI<AndroidAuthSession>(session); 
      }} 
Add it to manifest 

    <application 
      android:name=".MyApplication" 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher" 
      android:label="@string/app_name" 
      android:theme="@style/AppTheme" > 
Use in activity 

    MyApplication.getInstance().getDropbox()