Java tutorial
package mf.stickybit.android.trackergps; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.annotation.TargetApi; import android.app.Activity; import android.app.AlertDialog; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.DialogInterface; import android.content.Intent; import android.graphics.BitmapFactory; import android.os.Build; import android.os.Bundle; import android.support.v4.app.NotificationCompat; import android.text.TextUtils; import android.view.KeyEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.inputmethod.EditorInfo; import android.widget.AutoCompleteTextView; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * Created by Matias Emanuel Ferrigno on 16 jun 2015. * e-mail: meferrigno [at] gmail.com * <p/> * Copyright 2015 Matias Emanuel Ferrigno [meferrigno@gmail.com] * <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-2.00 * <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 LoginActivity extends Activity { // AsyncTask public UserLoginTask mAuthTask = null; // Referencias Interface private AutoCompleteTextView mEmailView; private EditText mPasswordView; private View mProgressView; private View mLoginFormView; private Button mEmailSignInButton; // Aux. Vars public int cantidadFails = 0; // cant. intentos fallidos. @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); // setup interface mEmailView = (AutoCompleteTextView) findViewById(R.id.email); mPasswordView = (EditText) findViewById(R.id.password); mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) { if (id == R.id.login || id == EditorInfo.IME_NULL) { attemptLogin(); return true; } return false; } }); mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button); mEmailSignInButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { attemptLogin(); } }); mLoginFormView = findViewById(R.id.login_form); mProgressView = findViewById(R.id.login_progress); // cantidad de fails en 0 setCantidadFails(0); } @Override protected void onResume() { super.onResume(); clear(); } @Override public void finish() { super.finish(); stopService(new Intent(this, TrackerGpsService.class)); System.exit(0); } private void clear() { /* Reseteamos los valores de los textbox y limpiamos la vars usuario y eventos. */ mEmailView.setText(""); mPasswordView.setText(""); TrackerGpsService.USUARIO = null; TrackerGpsService.EVENTOS = new ArrayList<Evento>(); } public void onBackPressed() { finish(); } public void attemptLogin() { if (mAuthTask != null) { return; } // Reset errors. mEmailView.setError(null); mPasswordView.setError(null); // Store values at the time of the login attempt. String email = mEmailView.getText().toString(); String password = mPasswordView.getText().toString(); boolean cancel = false; View focusView = null; // Check for a valid password, if the user entered one. if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) { mPasswordView.setError(getString(R.string.error_incorrect_password)); focusView = mPasswordView; cancel = true; } // Check for a valid email address. if (TextUtils.isEmpty(email)) { mEmailView.setError(getString(R.string.error_field_required)); focusView = mEmailView; cancel = true; } else if (!isEmailValid(email)) { mEmailView.setError(getString(R.string.error_invalid_email)); focusView = mEmailView; cancel = true; } if (cancel) { // There was an error; don't attempt login and focus the first // form field with an error. focusView.requestFocus(); } else { // Show a progress spinner, and kick off a background task to // perform the user login attempt. showProgress(true); mAuthTask = new UserLoginTask(this, email, password); mAuthTask.execute((Void) null); } } public void setCantidadFails(int cantidadFails) { cantidadFails = cantidadFails; } public int getCantidadFails() { return cantidadFails; } public void checkLogin(boolean isLogin) { if (isLogin) { NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); notificationManager.cancelAll(); final Intent notificationIntent = new Intent(this, MainActivity.class); notificationIntent.setAction(Intent.ACTION_MAIN); notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER); Notification notification = new NotificationCompat.Builder(this) .setContentIntent(PendingIntent.getActivity(this, 0, notificationIntent, 0)) .setSmallIcon(R.drawable.trackergps_icon) .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.drawable.trackergps_icon)) .setTicker("TrackerGPS").setWhen(System.currentTimeMillis()).setAutoCancel(false) .setContentTitle("TrackerGPS esta ejecutandose").setContentText("A la espera...").build(); notification.flags |= Notification.FLAG_NO_CLEAR; notificationManager.notify(0, notification); moveTaskToBack(true); } else { if ((getCantidadFails() == (getResources().getInteger(R.integer.login_max_retry)))) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("Fallo " + String.valueOf( (int) getApplicationContext().getResources().getInteger(R.integer.login_max_retry)) + " veces al iniciar sesin.") .setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { finish(); } }); builder.show(); } else { clear(); mPasswordView.setError(getString(R.string.error_incorrect_password)); mPasswordView.requestFocus(); } } } // Validador email private boolean isEmailValid(String email) { return email.contains("@"); } // Validador password private boolean isPasswordValid(String password) { return password.length() > 0; } /** * Shows the progress UI and hides the login form. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2) public void showProgress(final boolean show) { // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow // for very easy animations. If available, use these APIs to fade-in // the progress spinner. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime); mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); mLoginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } }); mProgressView.setVisibility(show ? View.VISIBLE : View.GONE); mProgressView.animate().setDuration(shortAnimTime).alpha(show ? 1 : 0) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mProgressView.setVisibility(show ? View.VISIBLE : View.GONE); } }); } else { // The ViewPropertyAnimator APIs are not available, so simply show // and hide the relevant UI components. mProgressView.setVisibility(show ? View.VISIBLE : View.GONE); mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } } }