com.dropbox.client2.exception.DropboxUnlinkedException

Question

我想将文本文件发送到保管箱，但它显示DropboxUnlinkedException .

溶液：：

首先，让您的程序得到完全身份验证。mDBApi.getSession.startAuthentication()方法之后，将自动调用onResume方法。让完整的身份验证完成，然后执行您要执行的操作。

主活动

public class MainActivity extends Activity implements LocationListener{
TextView date;
TextView lati;
TextView longi;
Button b1;
private DropboxAPI<AndroidAuthSession> mDBApi;
private LocationManager locationManager;
private String provider;
final static public String ACCOUNT_PREFS_NAME = "GPS_File";
final static public String APP_KEY = "5qiq4z06ikagxfb";
final static public String APP_SECRET = "f6mbf1hnn0re2ni";
final static public AccessType ACCESS_TYPE = AccessType.APP_FOLDER;
boolean mIsLoggedIn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    AppKeyPair appKeys = new AppKeyPair(APP_KEY, APP_SECRET);
    AndroidAuthSession session = new AndroidAuthSession(appKeys, ACCESS_TYPE);
    mDBApi = new DropboxAPI<AndroidAuthSession>(session);
 //this is start authentication     
   mDBApi.getSession().startAuthentication(MainActivity.this);
 //after this it will call onResume 
    date = (TextView)findViewById(R.id.textView2);
    lati = (TextView)findViewById(R.id.textView4);
    longi = (TextView)findViewById(R.id.textView6);
    b1 = (Button)findViewById(R.id.button1);
    createFile("abcd", "12345", "54321");
    toDropbox();
    setLoggedIn(mDBApi.getSession().isLinked());
}
void createFile(String str1,String str2,String str3)
{
    String data = str1+"t"+str2+"t"+str3;
    try{
        File myFile = new File("/sdcard/DropboxFile1.txt");
        myFile.createNewFile();
        FileOutputStream fOut = new FileOutputStream(myFile);
        OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
      myOutWriter.append(data);
      myOutWriter.close();
      fOut.close();
        }
        catch(Exception e)
        {e.printStackTrace();}
}

void toDropbox()
{
    b1.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            String filePath = Environment.getExternalStorageDirectory().getAbsolutePath().toString() + "/DropboxFile1.txt";
            File file = new File(filePath);
            mDBApi.getSession().startAuthentication(MainActivity.this);
            try {
                mDBApi.putFileOverwrite(filePath, new FileInputStream(file), file.length(), null);
            } catch (DropboxException e) {
                e.printStackTrace();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    });
}
private void clearKeys() {
    SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
    Editor edit = prefs.edit();
    edit.clear();
    edit.commit();
}
//This get call after StartAuthentication..
protected void onResume() {
    super.onResume();
    AndroidAuthSession session = mDBApi.getSession();
    // The next part must be inserted in the onResume() method of the
    // activity from which session.startAuthentication() was called, so
    // that Dropbox authentication completes properly.
    if (session.authenticationSuccessful()) {
        try {
            // Mandatory call to complete the auth
            session.finishAuthentication();
            // Store it locally in our app for later use
            TokenPair tokens = session.getAccessTokenPair();
            storeKeys(tokens.key, tokens.secret);
            setLoggedIn(true);
        } catch (IllegalStateException e) {
//Keep this toast.. It will show you the completed authentication..
            Toast.makeText(getBaseContext(), e.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
            Log.i("Dropbox", "Error authenticating", e);
        }
    }
}    
private void storeKeys(String key, String secret) {
    // Save the access key for later
    SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
    Editor edit = prefs.edit();
    edit.putString(APP_KEY, key);
    edit.putString(APP_SECRET, secret);
    edit.commit();
}
public void setLoggedIn(boolean loggedIn) {
    mIsLoggedIn = loggedIn;
}
public boolean isLoggedIn() {
    return mIsLoggedIn;
}

@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;
}
@Override
public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
    // TODO Auto-generated method stub
}
}//MainActivity Ends..`

'身份验证完成后，做其他事情。

Answer 1

您正在调用startAuthentication但随后立即尝试调用 API 方法（在身份验证实际发生之前）。只有在用户进行身份验证后，才能使用 API。在代码中，下面是在用户进行身份验证并返回到应用后运行的部分：

protected void onResume() {
    ...
    if (session.authenticationSuccessful()) {
        ...

Answer 2

当您错过在活动的 onResume（） 中调用此内容时，也可能会出现此错误：

                mDBApi.getSession().finishAuthentication();