Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * 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. */ package org.apache.taverna.mobile.ui.playerlogin; import android.content.Context; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.Snackbar; import android.support.design.widget.TextInputLayout; import android.support.v4.app.Fragment; import android.text.Editable; import android.text.TextWatcher; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.CheckBox; import android.widget.EditText; import org.apache.taverna.mobile.R; import org.apache.taverna.mobile.data.DataManager; import org.apache.taverna.mobile.data.local.PreferencesHelper; import org.apache.taverna.mobile.utils.ConnectionInfo; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.OnClick; public class PlayerLoginFragment extends Fragment implements PlayerLoginMvpView, View.OnFocusChangeListener { @BindView(R.id.etEmail) EditText mEditTextEmail; @BindView(R.id.etPassword) EditText mEditTextPassword; @BindView(R.id.input_layout_email) TextInputLayout mTextInputEmail; @BindView(R.id.input_layout_password) TextInputLayout mTextInputPassword; @BindView(R.id.cbRemember) CheckBox mCheckBoxRemember; OnSuccessful mCallback; private DataManager dataManager; private PlayerLoginPresenter mPlayerLoginPresenter; public static PlayerLoginFragment newInstance() { Bundle args = new Bundle(); PlayerLoginFragment fragment = new PlayerLoginFragment(); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); dataManager = new DataManager(new PreferencesHelper(getContext())); mPlayerLoginPresenter = new PlayerLoginPresenter(dataManager); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_player_login_layout, container, false); ButterKnife.bind(this, rootView); mPlayerLoginPresenter.attachView(this); String email = dataManager.getPreferencesHelper().getPlayerUserEmail(); String pw = dataManager.getPreferencesHelper().getPlayerUserPassword(); mEditTextEmail.setText(email); mEditTextPassword.setText(pw); return rootView; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mEditTextEmail.addTextChangedListener(new CustomTextWatcher(mEditTextEmail)); mEditTextEmail.setOnFocusChangeListener(this); mEditTextPassword.addTextChangedListener(new CustomTextWatcher(mEditTextPassword)); mEditTextPassword.setOnFocusChangeListener(this); } @Override public void onDestroyView() { super.onDestroyView(); mPlayerLoginPresenter.detachView(); } @OnClick(R.id.bLogin) public void login(View v) { if (ConnectionInfo.isConnectingToInternet(getContext())) { if (!mEditTextEmail.getText().toString().trim().isEmpty() && !mEditTextPassword.getText().toString().trim().isEmpty()) { mPlayerLoginPresenter.playerLogin(mEditTextEmail.getText().toString().trim(), mEditTextPassword.getText().toString().trim(), mCheckBoxRemember.isChecked()); } else { showError(R.string.error_vaild_credential); } } else { showError(R.string.no_internet_connection); } } @Override public void showError(int stringID) { final Snackbar snackbar = Snackbar.make(mEditTextPassword, getString(stringID), Snackbar.LENGTH_LONG); snackbar.setAction("OK", new View.OnClickListener() { @Override public void onClick(View view) { snackbar.dismiss(); } }); snackbar.show(); } @Override public void showCredentialError() { mTextInputEmail.setError(getString(R.string.err_login_email)); mTextInputPassword.setError(getString(R.string.err_login_password)); requestFocus(mEditTextPassword); } @Override public void validCredential() { mCallback.onSuccessfulLogin(); } private void validateEmail() { if (mEditTextEmail.getText().toString().trim().isEmpty()) { mTextInputEmail.setError(getString(R.string.err_login_email)); } else { mTextInputEmail.setError(null); } } private void requestFocus(View view) { if (view.requestFocus()) { getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE); } } private void validatePassword() { if (mEditTextPassword.getText().toString().trim().isEmpty()) { mTextInputPassword.setError(getString(R.string.err_login_password)); } else { mTextInputPassword.setError(null); } } @Override public void onFocusChange(View v, boolean hasFocus) { switch (v.getId()) { case R.id.etEmail: if (!v.hasFocus()) { validateEmail(); } break; case R.id.etPassword: if (!v.hasFocus()) { validatePassword(); } break; } } @Override public void onAttach(Context context) { super.onAttach(context); try { mCallback = (OnSuccessful) getActivity(); } catch (ClassCastException e) { throw new ClassCastException(getActivity().toString() + " must implement OnSuccessful"); } } public interface OnSuccessful { void onSuccessfulLogin(); } private class CustomTextWatcher implements TextWatcher { private View view; private CustomTextWatcher(View view) { this.view = view; } public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { } public void afterTextChanged(Editable editable) { switch (view.getId()) { case R.id.etEmail: validateEmail(); break; case R.id.etPassword: validatePassword(); break; } } } }