android - Android：登录表单到一个活动到另一个活动

Question

我有一个登录表单，用户在其中输入用户名和密码。用户登录后，他们应该有不同的视图，具体取决于他们的用户名和密码（管理员和访客）。这是我的代码-

   theUsername = (EditText) findViewById(R.id.Username);
    thePassword = (EditText) findViewById(R.id.Password);
    loginButton = (Button) findViewById(R.id.Login);
    registerButton = (Button) findViewById(R.id.Register);
    clearButton = (Button) findViewById(R.id.Clear);
    exitButton = (Button) findViewById(R.id.Exit);
    rememberDetails = (CheckBox) findViewById(R.id.RememberMe);

    //Create touch listeners for all buttons.
    loginButton.setOnClickListener(new Button.OnClickListener(){
        public void onClick (View v){
            LogMeIn(v);
        }
    });

    registerButton.setOnClickListener(new Button.OnClickListener(){
        public void onClick (View v){
            Register(v);
        }
    });

    clearButton.setOnClickListener(new Button.OnClickListener(){
        public void onClick (View v){
            ClearForm();
        }
    });

    exitButton.setOnClickListener(new Button.OnClickListener(){
        public void onClick (View v){
            Exit();
        }
    });
    //Create remember password check box listener.
    rememberDetails.setOnClickListener(new CheckBox.OnClickListener(){
        public void onClick (View v){
            RememberMe();
        }
    });

    //Handle remember password preferences.
    SharedPreferences prefs = getSharedPreferences(MY_PREFS, 0);
    String thisUsername = prefs.getString("username", "");
    String thisPassword = prefs.getString("password", "");
    boolean thisRemember = prefs.getBoolean("remember", false);
    if(thisRemember) {
        theUsername.setText(thisUsername);
        thePassword.setText(thisPassword);
        rememberDetails.setChecked(thisRemember);
    }

}

/**
 * Deals with Exit option - exits the application.
 */
private void Exit()
{
    finish();
}

/**
 * Clears the login form.
 */
private void ClearForm() {
    saveLoggedInUId(0,"","");
    theUsername.setText("");
    thePassword.setText("");
}

/**
 * Handles the remember password option.
 */
private void RememberMe() {
    boolean thisRemember = rememberDetails.isChecked();
    SharedPreferences prefs = getSharedPreferences(MY_PREFS, 0);
    Editor editor = prefs.edit();
    editor.putBoolean("remember", thisRemember);
    editor.commit();
}

/**
 * This method handles the user login process.  
 * @param v
 */
private void LogMeIn(View v) {
    //Get the username and password
    String thisUsername = theUsername.getText().toString();
    String thisPassword = thePassword.getText().toString();

    //Assign the hash to the password
    thisPassword = md5(thisPassword);

    // Check the existing user name and password database
    Cursor theUser = dbHelper.fetchUser(thisUsername, thisPassword);
    if (theUser != null) {
        startManagingCursor(theUser);
        if (theUser.getCount() > 0) {
            saveLoggedInUId(theUser.getLong(theUser.getColumnIndex(DatabaseAdapter.COL_ID)), thisUsername, thePassword.getText().toString());
            extracted(theUser);
            theUser.close();


                Intent i = new Intent(v.getContext(), test.class);
                startActivity(i);







        }

        //Returns appropriate message if no match is made
        else {
            Toast.makeText(getApplicationContext(), 
                    "You have entered an incorrect username or password.", 
                    Toast.LENGTH_SHORT).show();
            saveLoggedInUId(0, "", "");
        }
        extracted(theUser);
        theUser.close();
    }

    else {
        Toast.makeText(getApplicationContext(), 
                "Database query error", 
                Toast.LENGTH_SHORT).show();
    }
}

private void extracted(Cursor theUser) {
    stopManagingCursor(theUser);
}

/**
 * Open the Registration activity.
 * @param v
 */
private void Register(View v)
{
    Intent i = new Intent(v.getContext(), Register.class);
    startActivity(i);
}

private void saveLoggedInUId(long id, String username, String password) {
    SharedPreferences settings = getSharedPreferences(MY_PREFS, 0);
    Editor myEditor = settings.edit();
    myEditor.putLong("uid", id);
    myEditor.putString("username", username);
    myEditor.putString("password", password);
    boolean rememberThis = rememberDetails.isChecked();
    myEditor.putBoolean("rememberThis", rememberThis);
    myEditor.commit();
}


private String md5(String s) {
    try {
        MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
        digest.update(s.getBytes());
        byte messageDigest[] = digest.digest();

        StringBuffer hexString = new StringBuffer();
        for (int i=0; i<messageDigest.length; i++)
            hexString.append(Integer.toHexString(0xFF & messageDigest[i]));

        return hexString.toString();
    } 

    catch (NoSuchAlgorithmException e) {
        return s;
    }
}

问题是我无法为管理员或访客显示不同的视图

Answer 1

使用 thisUserName.equals("...") 而不是 thisUsername=="..."