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.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.Editable; import android.text.TextWatcher; import android.text.method.HideReturnsTransformationMethod; import android.text.method.PasswordTransformationMethod; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.EditText; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.ui.CreateKeyActivity.FragAction; import org.sufficientlysecure.keychain.ui.widget.PassphraseEditText; import org.sufficientlysecure.keychain.util.Passphrase; public class CreateKeyPassphraseFragment extends Fragment { // view CreateKeyActivity mCreateKeyActivity; PassphraseEditText mPassphraseEdit; EditText mPassphraseEditAgain; CheckBox mShowPassphrase; View mBackButton; View mNextButton; /** * Creates new instance of this fragment */ public static CreateKeyPassphraseFragment newInstance() { CreateKeyPassphraseFragment frag = new CreateKeyPassphraseFragment(); Bundle args = new Bundle(); frag.setArguments(args); return frag; } /** * 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().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(EditText editText1, EditText editText2) { Passphrase p1 = new Passphrase(editText1); Passphrase p2 = new Passphrase(editText2); return (p1.equals(p2)); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.create_key_passphrase_fragment, container, false); mPassphraseEdit = (PassphraseEditText) view.findViewById(R.id.create_key_passphrase); mPassphraseEditAgain = (EditText) view.findViewById(R.id.create_key_passphrase_again); mShowPassphrase = (CheckBox) view.findViewById(R.id.create_key_show_passphrase); mBackButton = view.findViewById(R.id.create_key_back_button); mNextButton = view.findViewById(R.id.create_key_next_button); // initial values // TODO: using String here is unsafe... if (mCreateKeyActivity.mPassphrase != null) { mPassphraseEdit.setText(mCreateKeyActivity.mPassphrase.toStringUnsafe()); mPassphraseEditAgain.setText(mCreateKeyActivity.mPassphrase.toStringUnsafe()); } mPassphraseEdit.requestFocus(); mBackButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { back(); } }); mNextButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { nextClicked(); } }); mShowPassphrase.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { mPassphraseEdit.setTransformationMethod(HideReturnsTransformationMethod.getInstance()); mPassphraseEditAgain.setTransformationMethod(HideReturnsTransformationMethod.getInstance()); } else { mPassphraseEdit.setTransformationMethod(PasswordTransformationMethod.getInstance()); mPassphraseEditAgain.setTransformationMethod(PasswordTransformationMethod.getInstance()); } } }); TextWatcher textWatcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { if (!isEditTextNotEmpty(getActivity(), mPassphraseEdit)) { mPassphraseEditAgain.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0); return; } if (areEditTextsEqual(mPassphraseEdit, mPassphraseEditAgain)) { mPassphraseEditAgain.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_stat_retyped_ok, 0); } else { mPassphraseEditAgain.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_stat_retyped_bad, 0); } } @Override public void afterTextChanged(Editable s) { } }; mPassphraseEdit.addTextChangedListener(textWatcher); mPassphraseEditAgain.addTextChangedListener(textWatcher); return view; } @Override public void onAttach(Context context) { super.onAttach(context); mCreateKeyActivity = (CreateKeyActivity) getActivity(); } private void back() { hideKeyboard(); mCreateKeyActivity.loadFragment(null, FragAction.TO_LEFT); } private void nextClicked() { if (isEditTextNotEmpty(getActivity(), mPassphraseEdit)) { if (!areEditTextsEqual(mPassphraseEdit, mPassphraseEditAgain)) { mPassphraseEditAgain.setError( getActivity().getApplicationContext().getString(R.string.create_key_passphrases_not_equal)); mPassphraseEditAgain.requestFocus(); return; } mPassphraseEditAgain.setError(null); // save state mCreateKeyActivity.mPassphrase = new Passphrase(mPassphraseEdit); CreateKeyFinalFragment frag = CreateKeyFinalFragment.newInstance(); hideKeyboard(); mCreateKeyActivity.loadFragment(frag, FragAction.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); } }