title: I want to save a username and password in shared preferences
body: <p>I am  Learning android development. I am making a registration and login app. my registration and login working properly. But I don't know how to save username and password in shared preference. and set a boolean value to check in slash screen to check login.
  here my code.</p>
  
  <pre><code>public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
      private final AppCompatActivity activity = LoginActivity.this;
  
      private NestedScrollView nestedScrollView;
  
      private TextInputLayout textInputLayoutEmail;
      private TextInputLayout textInputLayoutPassword;
  
      private TextInputEditText textInputEditTextEmail;
      private TextInputEditText textInputEditTextPassword;
  
      private AppCompatButton appCompatButtonLogin;
  
      private AppCompatTextView textViewLinkRegister;
  
      private InputValidation inputValidation;
      private DatabaseHelper databaseHelper;
      AnimationDrawable animationDrawable;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_login);
          initViews();
          initListeners();
          initObjects();
          animationDrawable=(AnimationDrawable)nestedScrollView.getBackground();
          animationDrawable.setEnterFadeDuration(1000);
          animationDrawable.setExitFadeDuration(1000);
          animationDrawable.start();
  
          //saving data in shared priference
          SharedPreferences sharedPreferences=getSharedPreferences("Login",MODE_PRIVATE);
          SharedPreferences.Editor editor=sharedPreferences.edit();
          editor.putBoolean("isLogin",true);
          editor.putString("user", String.valueOf(textInputEditTextEmail));
          editor.putString("pass", String.valueOf(textInputEditTextPassword));
          editor.commit();
      }
  
      /**
       * This method is to initialize views
       */
      private void initViews() {
  
          nestedScrollView = (NestedScrollView) findViewById(R.id.nestedScrollView);
  
          textInputLayoutEmail = (TextInputLayout) findViewById(R.id.textInputLayoutEmail);
          textInputLayoutPassword = (TextInputLayout) findViewById(R.id.textInputLayoutPassword);
  
          textInputEditTextEmail = (TextInputEditText) findViewById(R.id.textInputEditTextEmail);
          textInputEditTextPassword = (TextInputEditText) findViewById(R.id.textInputEditTextPassword);
  
          appCompatButtonLogin = (AppCompatButton) findViewById(R.id.appCompatButtonLogin);
  
          textViewLinkRegister = (AppCompatTextView) findViewById(R.id.textViewLinkRegister);
  
      }
  
      /**
       * This method is to initialize listeners
       */
      private void initListeners() {
          appCompatButtonLogin.setOnClickListener(this);
          textViewLinkRegister.setOnClickListener(this);
      }
  
      /**
       * This method is to initialize objects to be used
       */
      private void initObjects() {
          databaseHelper = new DatabaseHelper(activity);
          inputValidation = new InputValidation(activity);
  
      }
  
      /**
       * This implemented method is to listen the click on view
       *
       * @param v
       */
      @Override
      public void onClick(View v) {
          switch (v.getId()) {
              case R.id.appCompatButtonLogin:
                  verifyFromSQLite();
                  break;
              case R.id.textViewLinkRegister:
                  // Navigate to RegisterActivity
                  Intent intentRegister = new Intent(getApplicationContext(), RegisterActivity.class);
                  startActivity(intentRegister);
                  break;
          }
      }
  
      /**
       * This method is to validate the input text fields and verify login credentials from SQLite
       */
      private void verifyFromSQLite() {
          if (!inputValidation.isInputEditTextFilled(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
              return;
          }
          if (!inputValidation.isInputEditTextEmail(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
              return;
          }
          if (!inputValidation.isInputEditTextFilled(textInputEditTextPassword, textInputLayoutPassword, getString(R.string.error_message_email))) {
              return;
          }
  
          if (databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim()
                  , textInputEditTextPassword.getText().toString().trim())) {
              Intent accountsIntent = new Intent(activity, HomePage.class);
              accountsIntent.putExtra("EMAIL", textInputEditTextEmail.getText().toString().trim());
              emptyInputEditText();
              startActivity(accountsIntent);
              finish();
          } else {
              // Snack Bar to show success message that record is wrong
              Toast.makeText(getApplicationContext(),getString(R.string.error_valid_email_password),Toast.LENGTH_LONG).show();
  
          }
      }
  
      /**
       * This method is to empty all input edit text
       */
      private void emptyInputEditText() {
          textInputEditTextEmail.setText(null);
          textInputEditTextPassword.setText(null);
      }
  }
  </code></pre>
  
  <p>This is my slash screen code.</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
      private static  int slash_screen_time_out=4000;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          new Handler().postDelayed(new Runnable() {
              @Override
              public void run() {
                  Intent intent=new Intent(getApplicationContext(),LoginActivity.class);
                  startActivity(intent);
                  finish();
              }
          },slash_screen_time_out);
      }
  }
  </code></pre>
  
  <p>Please help me to resolve this problem. 
  Thank you in advance.</p>