Java tutorial
package ca.uqac.florentinth.speakerauthentication; import android.content.Intent; import android.media.AudioManager; import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.app.NavUtils; import android.support.v4.app.TaskStackBuilder; import android.support.v7.app.AppCompatActivity; import android.text.InputType; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.RadioButton; import ca.uqac.florentinth.speakerauthentication.Database.Controllers.UserController; import ca.uqac.florentinth.speakerauthentication.Database.Models.User; import ca.uqac.florentinth.speakerauthentication.Utils.CryptUtils; import ca.uqac.florentinth.speakerauthentication.Utils.StringUtils; /** * Copyright 2016 Florentin Thullier. * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class CreateActivity extends AppCompatActivity { private static final String TAG = CreateActivity.class.getSimpleName(); private View view; private EditText usernameInput, passwordInput; private RadioButton femaleRadio, maleRadio; private ImageView visibilityImage; private Button createBtn; private String username, password; private int gender; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_create); this.getSupportActionBar().setDisplayHomeAsUpEnabled(true); setVolumeControlStream(AudioManager.STREAM_MUSIC); initGUI(); } private void initGUI() { view = findViewById(R.id.create_layout); usernameInput = (EditText) findViewById(R.id.username_input); passwordInput = (EditText) findViewById(R.id.password_input); visibilityImage = (ImageView) findViewById(R.id.visibility); femaleRadio = (RadioButton) findViewById(R.id.radio_female); maleRadio = (RadioButton) findViewById(R.id.radio_male); createBtn = (Button) findViewById(R.id.btn_create); usernameInput.setText("user" + StringUtils.getCurrentDateTime()); visibilityImage.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { passwordInput.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD); } else { if (event.getAction() == MotionEvent.ACTION_UP) { passwordInput .setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD); } } return true; } }); createBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { submit(); } }); } private void submit() { if (validateInputs()) { UserController userController = new UserController(this); userController.insert(new User(username, getGender(), CryptUtils.SHA256(password))); finish(); } } public int getGender() { if (femaleRadio.isChecked()) { return 0; } return 1; } private boolean validateInputs() { username = usernameInput.getText().toString().trim().toLowerCase(); password = passwordInput.getText().toString().trim(); if (username.equals("")) { Snackbar.make(view, getString(R.string.username_empty_error), Snackbar.LENGTH_LONG).show(); return false; } if (!StringUtils.isAlNum(username)) { Snackbar.make(view, getString(R.string.username_special_chars_error), Snackbar.LENGTH_LONG).show(); return false; } if (username.length() <= 2) { Snackbar.make(view, getString(R.string.username_length_error), Snackbar.LENGTH_LONG).show(); return false; } if (password.equals("")) { Snackbar.make(view, getString(R.string.password_empty_error), Snackbar.LENGTH_LONG).show(); return false; } if (password.length() <= 5) { Snackbar.make(view, getString(R.string.password_length_error), Snackbar.LENGTH_LONG).show(); return false; } return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: Intent upIntent = NavUtils.getParentActivityIntent(this); if (NavUtils.shouldUpRecreateTask(this, upIntent)) { TaskStackBuilder.create(this).addNextIntentWithParentStack(upIntent).startActivities(); } else { NavUtils.navigateUpTo(this, upIntent); } return true; } return super.onOptionsItemSelected(item); } }