Java tutorial
/* * Copyright (C) 2014 Dominik Schrmann <dominik@dominikschuermann.de> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.sufficientlysecure.keychain.ui; import android.content.Context; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.Editable; import android.text.TextWatcher; import android.util.Patterns; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.EditText; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.util.ContactHelper; import java.util.regex.Matcher; public class CreateKeyInputFragment extends Fragment { CreateKeyActivity mCreateKeyActivity; AutoCompleteTextView mNameEdit; AutoCompleteTextView mEmailEdit; EditText mPassphraseEdit; EditText mPassphraseEditAgain; View mCreateButton; public static final String ARG_NAME = "name"; public static final String ARG_EMAIL = "email"; /** * Creates new instance of this fragment */ public static CreateKeyInputFragment newInstance(String name, String email) { CreateKeyInputFragment frag = new CreateKeyInputFragment(); Bundle args = new Bundle(); args.putString(ARG_NAME, name); args.putString(ARG_EMAIL, email); frag.setArguments(args); return frag; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.create_key_input_fragment, container, false); mNameEdit = (AutoCompleteTextView) view.findViewById(R.id.create_key_name); mEmailEdit = (AutoCompleteTextView) view.findViewById(R.id.create_key_email); mPassphraseEdit = (EditText) view.findViewById(R.id.create_key_passphrase); mPassphraseEditAgain = (EditText) view.findViewById(R.id.create_key_passphrase_again); mCreateButton = view.findViewById(R.id.create_key_button); // initial values String name = getArguments().getString(ARG_NAME); String email = getArguments().getString(ARG_EMAIL); mNameEdit.setText(name); mEmailEdit.setText(email); // focus non-empty edit fields if (name != null && email != null) { mPassphraseEdit.requestFocus(); } else if (name != null) { mEmailEdit.requestFocus(); } mEmailEdit.setThreshold(1); // Start working from first character mEmailEdit.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, ContactHelper.getPossibleUserEmails(getActivity()))); mEmailEdit.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void afterTextChanged(Editable editable) { String email = editable.toString(); if (email.length() > 0) { Matcher emailMatcher = Patterns.EMAIL_ADDRESS.matcher(email); if (emailMatcher.matches()) { mEmailEdit.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.uid_mail_ok, 0); } else { mEmailEdit.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.uid_mail_bad, 0); } } else { // remove drawable if email is empty mEmailEdit.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0); } } }); mNameEdit.setThreshold(1); // Start working from first character mNameEdit.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, ContactHelper.getPossibleUserNames(getActivity()))); mCreateButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { createKeyCheck(); } }); return view; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mCreateKeyActivity = (CreateKeyActivity) getActivity(); } private void createKeyCheck() { if (isEditTextNotEmpty(getActivity(), mNameEdit) && isEditTextNotEmpty(getActivity(), mEmailEdit) && isEditTextNotEmpty(getActivity(), mPassphraseEdit) && areEditTextsEqual(getActivity(), mPassphraseEdit, mPassphraseEditAgain)) { CreateKeyFinalFragment frag = CreateKeyFinalFragment.newInstance(mNameEdit.getText().toString(), mEmailEdit.getText().toString(), mPassphraseEdit.getText().toString()); hideKeyboard(); mCreateKeyActivity.loadFragment(null, frag, CreateKeyActivity.FRAG_ACTION_TO_RIGHT); } } private void hideKeyboard() { if (getActivity() == null) { return; } InputMethodManager inputManager = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); // check if no view has focus View v = getActivity().getCurrentFocus(); if (v == null) return; inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0); } /** * Checks if text of given EditText is not empty. If it is empty an error is * set and the EditText gets the focus. * * @param context * @param editText * @return true if EditText is not empty */ private static boolean isEditTextNotEmpty(Context context, EditText editText) { boolean output = true; if (editText.getText().toString().length() == 0) { editText.setError(context.getString(R.string.create_key_empty)); editText.requestFocus(); output = false; } else { editText.setError(null); } return output; } private static boolean areEditTextsEqual(Context context, EditText editText1, EditText editText2) { boolean output = true; if (!editText1.getText().toString().equals(editText2.getText().toString())) { editText2.setError(context.getString(R.string.create_key_passphrases_not_equal)); editText2.requestFocus(); output = false; } else { editText2.setError(null); } return output; } }