Java tutorial
package ca.uqac.florentinth.speakerauthentication; import android.Manifest; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.PackageManager; import android.media.AudioManager; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.design.widget.Snackbar; import android.support.v4.app.ActivityCompat; import android.text.InputType; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import ca.uqac.florentinth.speakerauthentication.Database.Controllers.UserController; import ca.uqac.florentinth.speakerauthentication.Database.Models.User; import ca.uqac.florentinth.speakerauthentication.Utils.AndroidUtils; 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 MainActivity extends Activity { private static final String TAG = MainActivity.class.getSimpleName(); private static final int EXTERNAL_STORAGE_REQUEST_CODE = 1; private static final int RECORD_AUDIO_REQUEST_CODE = 2; private static final int LOCATION_REQUEST_CODE = 3; private View view; private EditText usernameInput, passwordInput; private Button loginBtn, newAccountBtn; private ImageView visibiltyImage; private SharedPreferences sharedPreferences; private String username; private String password; @Override protected void onCreate(Bundle savedInstanceState) { isUserLogged(); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setVolumeControlStream(AudioManager.STREAM_MUSIC); initGUI(); } @Override protected void onResume() { isUserLogged(); super.onResume(); } private void isUserLogged() { sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); if (sharedPreferences.contains("user_id")) { startActivity(new Intent(getApplicationContext(), MenuActivity.class)); finish(); } } private void initGUI() { view = findViewById(R.id.main_layout); usernameInput = (EditText) findViewById(R.id.username_input); passwordInput = (EditText) findViewById(R.id.password_input); visibiltyImage = (ImageView) findViewById(R.id.visibility); loginBtn = (Button) findViewById(R.id.btn_login); newAccountBtn = (Button) findViewById(R.id.btn_new_account); visibiltyImage.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; } }); loginBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { checkExternalStoragePermissions(); } }); newAccountBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(getApplicationContext(), CreateActivity.class)); } }); } private void submit() { if (validateInputs()) { UserController userController = new UserController(this); User user = userController.getUserByUsername(username); if ((username.equals(user.getUsername()) && CryptUtils.SHA256(password).equals(user.getPassword()))) { sharedPreferences.edit().putInt("user_id", user.getId()).apply(); startActivity(new Intent(this, MenuActivity.class)); finish(); } else { Snackbar.make(view, getString(R.string.login_failed), Snackbar.LENGTH_LONG).show(); } } } private void checkExternalStoragePermissions() { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { requestExternalStoragePermissions(); } else { checkLocationPermissions(); } } private void checkLocationPermissions() { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { requestLocationPermissions(); } else { checkRecordAudioPermission(); } } private void checkRecordAudioPermission() { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) { requestRecordAudioPermissions(); } else { submit(); } } private void requestExternalStoragePermissions() { if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) { Snackbar.make(view, getString(R.string.external_storage_permission_rationale), Snackbar.LENGTH_INDEFINITE).setAction(getString(R.string.ok_label), new View.OnClickListener() { @Override public void onClick(View view) { ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, EXTERNAL_STORAGE_REQUEST_CODE); } }).show(); } else { ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, EXTERNAL_STORAGE_REQUEST_CODE); } } private void requestLocationPermissions() { if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION) || ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) { Snackbar.make(view, getString(R.string.location_permission_rationale), Snackbar.LENGTH_INDEFINITE) .setAction(getString(R.string.ok_label), new View.OnClickListener() { @Override public void onClick(View view) { ActivityCompat .requestPermissions(MainActivity.this, new String[] { Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION }, LOCATION_REQUEST_CODE); } }).show(); } else { ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION }, LOCATION_REQUEST_CODE); } } private void requestRecordAudioPermissions() { if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECORD_AUDIO)) { Snackbar.make(view, getString(R.string.record_audio_permission_rationale), Snackbar.LENGTH_INDEFINITE) .setAction(getString(R.string.ok_label), new View.OnClickListener() { @Override public void onClick(View view) { ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.RECORD_AUDIO }, RECORD_AUDIO_REQUEST_CODE); } }).show(); } else { ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.RECORD_AUDIO }, RECORD_AUDIO_REQUEST_CODE); } } 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 void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == EXTERNAL_STORAGE_REQUEST_CODE) { if (AndroidUtils.verifyPermissions(grantResults)) { Snackbar.make(view, R.string.external_storage_permission_granted, Snackbar.LENGTH_SHORT).show(); checkLocationPermissions(); } else { Snackbar.make(view, R.string.external_storage_permission_denied, Snackbar.LENGTH_SHORT).show(); } } else if (requestCode == LOCATION_REQUEST_CODE) { if (AndroidUtils.verifyPermissions(grantResults)) { Snackbar.make(view, R.string.location_permission_granted, Snackbar.LENGTH_SHORT).show(); checkRecordAudioPermission(); } else { Snackbar.make(view, R.string.location_permission_denied, Snackbar.LENGTH_SHORT).show(); } } else if (requestCode == RECORD_AUDIO_REQUEST_CODE) { if (AndroidUtils.verifyPermissions(grantResults)) { Snackbar.make(view, R.string.record_audio_permission_granted, Snackbar.LENGTH_SHORT).show(); submit(); } else { Snackbar.make(view, R.string.record_audio_permission_denied, Snackbar.LENGTH_SHORT).show(); } } else { super.onRequestPermissionsResult(requestCode, permissions, grantResults); } } }