Java tutorial
/* * Copyright (c) 2014 Oleksandr Tyshkovets <olexandr.tyshkovets@gmail.com> * * 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 * * 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.gnucash.android.ui.passcode; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import org.gnucash.android.R; /** * Soft numeric keyboard for lock screen and passcode preference. * @author Oleksandr Tyshkovets <olexandr.tyshkovets@gmail.com> */ public class KeyboardFragment extends Fragment { private static final int DELAY = 500; private TextView pass1; private TextView pass2; private TextView pass3; private TextView pass4; private int length = 0; public interface OnPasscodeEnteredListener { void onPasscodeEntered(String pass); } private OnPasscodeEnteredListener listener; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_numeric_keyboard, container, false); pass1 = (TextView) rootView.findViewById(R.id.passcode1); pass2 = (TextView) rootView.findViewById(R.id.passcode2); pass3 = (TextView) rootView.findViewById(R.id.passcode3); pass4 = (TextView) rootView.findViewById(R.id.passcode4); rootView.findViewById(R.id.one_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("1"); } }); rootView.findViewById(R.id.two_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("2"); } }); rootView.findViewById(R.id.three_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("3"); } }); rootView.findViewById(R.id.four_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("4"); } }); rootView.findViewById(R.id.five_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("5"); } }); rootView.findViewById(R.id.six_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("6"); } }); rootView.findViewById(R.id.seven_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("7"); } }); rootView.findViewById(R.id.eight_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("8"); } }); rootView.findViewById(R.id.nine_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("9"); } }); rootView.findViewById(R.id.zero_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { add("0"); } }); rootView.findViewById(R.id.delete_btn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { switch (length) { case 1: pass1.setText(null); length--; break; case 2: pass2.setText(null); length--; break; case 3: pass3.setText(null); length--; break; case 4: pass4.setText(null); length--; } } }); return rootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { listener = (OnPasscodeEnteredListener) activity; } catch (ClassCastException e) { throw new ClassCastException( activity.toString() + " must implement " + KeyboardFragment.OnPasscodeEnteredListener.class); } } private void add(String num) { switch (length + 1) { case 1: pass1.setText(num); length++; break; case 2: pass2.setText(num); length++; break; case 3: pass3.setText(num); length++; break; case 4: pass4.setText(num); length++; new Handler().postDelayed(new Runnable() { public void run() { listener.onPasscodeEntered( pass1.getText().toString() + pass2.getText() + pass3.getText() + pass4.getText()); pass1.setText(null); pass2.setText(null); pass3.setText(null); pass4.setText(null); length = 0; } }, DELAY); } } }