Using dropbox api in Android

DropBox API + Android

I wanted to ask someone to use the DropBox API . The site has an instruction and an example the example does not start, but according to the instructions it is not quite clear how to authenticate ! Can someone tell me or explain.

public class MainActivity extends Activity { final String FILENAME = "file.txt"; private LinearLayout mDisplay; private static final String TAG = "log"; private static final String APP_KEY="xxx"; private static final String APP_SECRET="yyy"; private static final AccessType ACCESS_TYPE = AccessType.APP_FOLDER; final static private String ACCOUNT_PREFS_NAME = "prefs"; final static private String ACCESS_KEY_NAME = "ACCESS_KEY"; final static private String ACCESS_SECRET_NAME = "ACCESS_SECRET"; DropboxAPI<AndroidAuthSession>mApi; private boolean mLoggedIn; private Button btnAuto; private Button btnSave; private Button btnDownload; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(TAG, "Метод onCreate"); AndroidAuthSession session = buildSession(); mApi = new DropboxAPI<AndroidAuthSession>(session); mApi.getSession().startAuthentication(MainActivity.this); setContentView(R.layout.activity_main); checkAppKeySetup(); btnAuto = (Button) findViewById(R.id.btnAuto); btnAuto.setOnClickListener(new OnClickListener() { public void onClick(View v) { // This logs you out if you're logged in, or vice versa if (mLoggedIn) { Log.d(TAG, "if(mLoggedIn"); logOut(); } else { // Start the remote authentication mApi.getSession().startAuthentication(MainActivity.this); Log.d(TAG, "else mLoggedIn"); } } }); btnSave = (Button) findViewById(R.id.btnSave); btnSave.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AccessTokenPair aTP = new AccessTokenPair(APP_KEY, APP_SECRET); writeFile(); readFile(); FileInputStream inputStream = null; try { File file = new File("/data/data/com.example.db_test2/files/file.txt"); Log.d(TAG, "File file..."); if(!file.exists()){ file.createNewFile(); } inputStream = new FileInputStream(file); Log.d(TAG, "file.lenght "+file.length()); Entry newEntry = mApi.putFile("/Task for you/file.txt", inputStream, file.length(), null, null); Log.i("DbExampleLog", "The uploaded file's rev is: " + newEntry.rev); } catch (DropboxUnlinkedException e) { Log.d(TAG,inputStream.toString()); // User has unlinked, ask them to link again here. Log.e("DbExampleLog", "User has unlinked."); } catch (DropboxException e) { Log.e("DbExampleLog", "Something went wrong while uploading."); } catch (FileNotFoundException e) { Log.e("DbExampleLog", "File not found."); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) {} } } } }); btnDownload = (Button) findViewById(R.id.btnDownload); btnDownload.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { readFile(); FileOutputStream outputStream = null; try { File file = new File(FILENAME); Log.d(TAG, file.toString()); outputStream = new FileOutputStream(file); Log.d(TAG, outputStream.toString()); DropboxFileInfo info = mApi.getFile(FILENAME, null, outputStream, null); Log.i("DbExampleLog", "The file's rev is: " ); // /path/to/new/file.txt now has stuff in it. } catch (DropboxException e) { Log.e("DbExampleLog", "Something went wrong while downloading."); } catch (FileNotFoundException e) { Log.e("DbExampleLog", "File not found."); } finally { if (outputStream != null) { try { outputStream.close(); } catch (IOException e) {} } } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } private AndroidAuthSession buildSession() { AppKeyPair appKeyPair = new AppKeyPair(APP_KEY, APP_SECRET); AndroidAuthSession session; String[] stored = getKeys(); if (stored != null) { AccessTokenPair accessToken = new AccessTokenPair(stored[0], stored[1]); session = new AndroidAuthSession(appKeyPair, ACCESS_TYPE, accessToken); } else { session = new AndroidAuthSession(appKeyPair, ACCESS_TYPE); } return session; } private String[] getKeys() { SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0); String key = prefs.getString(ACCESS_KEY_NAME, null); String secret = prefs.getString(ACCESS_SECRET_NAME, null); if (key != null && secret != null) { String[] ret = new String[2]; ret[0] = key; ret[1] = secret; return ret; } else { return null; } } private void checkAppKeySetup() { // Check to make sure that we have a valid app key if (APP_KEY.startsWith("CHANGE") || APP_SECRET.startsWith("CHANGE")) { showToast("You must apply for an app key and secret from developers.dropbox.com, and add them to the DBRoulette ap before trying it."); finish(); return; }} private void showToast(String msg) { Toast error = Toast.makeText(this, msg, Toast.LENGTH_LONG); error.show(); } private void logOut() { // Remove credentials from the session mApi.getSession().unlink(); // Clear our stored keys clearKeys(); // Change UI state to display logged out version setLoggedIn(false); } private void clearKeys() { SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0); Editor edit = prefs.edit(); edit.clear(); edit.commit(); } private void setLoggedIn(boolean loggedIn) { mLoggedIn = loggedIn; if (loggedIn) { btnAuto.setText("Unlink from Dropbox"); mDisplay.setVisibility(View.VISIBLE); } else { btnAuto.setText("Link with Dropbox"); mDisplay.setVisibility(View.GONE); } } void writeFile() { try { // отрываем поток для записи BufferedWriter bw = new BufferedWriter(new OutputStreamWriter( openFileOutput(FILENAME, MODE_WORLD_READABLE))); // пишем данные bw.write("Содержимое файла"); bw.write("Check it"); // закрываем поток bw.close(); Log.d(TAG, "Файл записан"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } void readFile() { try { // открываем поток для чтения BufferedReader br = new BufferedReader(new InputStreamReader( openFileInput(FILENAME))); String str = ""; // читаем содержимое while ((str = br.readLine()) != null) { Log.d(TAG, str); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }