Java tutorial
package ca.ualberta.slevinsk.gameshow; /** * Copyright 2015 John Slevinsky * * 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. */ import android.app.Activity; import android.app.Dialog; import android.content.DialogInterface; import android.net.Uri; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.Snackbar; import android.support.v4.app.DialogFragment; import android.support.v7.app.AlertDialog; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.widget.NumberPicker; import android.widget.Toast; /** * Fragment that implements a number picker dialog. * * Used to choose the number of players in the gameshow buzzer game. */ public class NumberPickerFragment extends DialogFragment { private static final String ARG_PARAM1 = "gameshowBuzzer"; private NumberPicker numberPicker; public static NumberPickerFragment newInstance(GameshowBuzzerActivity gameshowBuzzer) { NumberPickerFragment fragment = new NumberPickerFragment(); Bundle args = new Bundle(); fragment.setArguments(args); return fragment; } public NumberPickerFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setCancelable(false); } @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setTitle("How many players?"); builder.setCancelable(false); numberPicker = new NumberPicker(getContext()); numberPicker.setMinValue(2); numberPicker.setMaxValue(4); numberPicker.setOnValueChangedListener(onPlayerCountChangeListener); builder.setView(numberPicker); builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }); return builder.create(); } NumberPicker.OnValueChangeListener onPlayerCountChangeListener; @Override public void onAttach(Activity activity) { super.onAttach(activity); try { onPlayerCountChangeListener = (NumberPicker.OnValueChangeListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnValueChangListener"); } } }