Java tutorial
package com.example.android; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.media.MediaPlayer; import android.os.Build; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.RadioGroup; import android.widget.TextView; /** * Copyright 2012, Grupp02 * * This file is part of Handalfabetet. * * Handalfabetet 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. * * Handalfabetet 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 Handalfabetet. If not, see <http://www.gnu.org/licenses/>. */ /** * The LevelChooserActivity class. * * @author : Grupp02 * @version : 2012-10-21, v1.0 * */ public class LevelChooserActivity extends Activity { // Audio Focus helper private AudioFocusHelper focusHelper; // DifficultyLevel private int difficulty = 1; private int numLetters; private Button firstLevelButton; private Button secondLevelButton; private Button thirdLevelButton; private RadioGroup radialDifficulty; private TextView userName; private TextView userStatus; private Bitmap img; private ImageView userImg; private final int zero = 0; private final int oneLetter = 1; private final int twoLetters = 2; private final int threeLetters = 3; private final int difficultyOne = 1; private final int difficultyTwo = 2; private final int difficultyThree = 3; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_level_chooser); // Make sure we're running on Honeycomb or higher to use ActionBar APIs if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // getActionBar().setDisplayHomeAsUpEnabled( true ); } if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) { focusHelper = new AudioFocusHelper(this); } else { focusHelper = null; } // User Image userImg = (ImageView) findViewById(R.id.userpic); img = (Bitmap) (getIntent().getExtras().getParcelable("userImg")); userImg.setImageBitmap(img); userStatus = (TextView) findViewById(R.id.textView1); // Since a user must be logged in at this point, this status does not // need // retrieved userStatus.setText(R.string.logged_in); // Displays the username userName = (TextView) findViewById(R.id.textView2); userName.setText(getIntent().getStringExtra("Name")); firstLevelButton = (Button) findViewById(R.id.firstLevelButton); secondLevelButton = (Button) findViewById(R.id.secondLevelButton); thirdLevelButton = (Button) findViewById(R.id.thirdLevelButton); radialDifficulty = (RadioGroup) findViewById(R.id.radialDifficulty); firstLevelButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { playButton(); numLetters = oneLetter; chooseDifficulty(v); } }); secondLevelButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { playButton(); numLetters = twoLetters; chooseDifficulty(v); } }); thirdLevelButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { playButton(); numLetters = threeLetters; chooseDifficulty(v); } }); } @Override /** * onResume is overridden in order to utterly abandon sound focus if * sound has been turned off, or resume sound if on. * */ public void onResume() { super.onResume(); if (SoundPlayer.getSoundEnabled() == false) { if (focusHelper != null) { focusHelper.abandonFocus(); } SoundPlayer.stop(); } else { SoundPlayer.resume(); } } @Override public void onPause() { super.onPause(); // Always call the superclass method first // Pause sound when paused if (SoundPlayer.getSoundEnabled()) { SoundPlayer.pause(); } } public void onRadioButtonClicked(View v) { int selectedId = radialDifficulty.getCheckedRadioButtonId(); if (selectedId == R.id.difficulty1Radial) { difficulty = difficultyOne; } if (selectedId == R.id.difficulty2Radial) { difficulty = difficultyTwo; } if (selectedId == R.id.difficulty3Radial) { difficulty = difficultyThree; } } /** * The getAudioFocus method attempts to gain focus for playing audio. If * full access can't be gained, transitive access at a quiet volume is * attempted. If that can't be granted, false is returned. * * @return : true if focus in some form is granted, otherwise false */ private boolean getAudioFocus() { if (focusHelper != null) { if (!focusHelper.requestFocus()) { if (!focusHelper.requestQuietFocus()) { return false; } else { return true; } } else { return true; } } return false; } /** * playButton plays the button sound * * If there is an AudioFocusHelper (api >= 8) use it, otherwise default to * SoundPlayer */ public void playButton() { if (SoundPlayer.getSoundEnabled()) { if (focusHelper != null) { if (getAudioFocus()) { focusHelper.playButton(); } } else { SoundPlayer.playButton(this); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_level_chooser, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } @Override public void onSaveInstanceState(Bundle savedInstanceState) { // Save name, user status, and user picture savedInstanceState.putString("Name", userName.getText().toString()); savedInstanceState.putString("status", userStatus.getText().toString()); savedInstanceState.putParcelable("picture", img); savedInstanceState.putInt("difficulty", difficulty); savedInstanceState.putInt("letters", numLetters); // Always call the superclass so it can save the view hierarchy state super.onSaveInstanceState(savedInstanceState); } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { // Always call the superclass so it can restore the view hierarchy super.onRestoreInstanceState(savedInstanceState); // Restore name, user status, and user picture userName.setText(savedInstanceState.getString("Name")); userStatus.setText(savedInstanceState.getString("status")); img = savedInstanceState.getParcelable("picture"); userImg.setImageBitmap(img); difficulty = savedInstanceState.getInt("difficulty"); numLetters = savedInstanceState.getInt("letters "); } /** Called when the user clicks a difficulty button */ public void chooseDifficulty(View v) { Intent intent = new Intent("android.intent.action.GAME"); intent.putExtra("Difficulty", difficulty); intent.putExtra("Letters", numLetters); intent.putExtra("Name", userName.getText().toString()); intent.putExtra("userImg", img); startActivity(intent); // kills current activity finish(); } /** * onKeyDown overrides onKeyDown and allows code to be executed when the * back button is pushed in the simulator / on the mobile phone Since * pushing "back" won't necessarily call the destroy method as far as I * understand it. * * @param keyCode * : code of the key pressed * @param event * : the event for the key pressed */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == zero) { //This code cannot be in onStop in LevelChooserActivity because //it also kills the ticking noise as Game begins //cancel any noises and abandon focus SoundPlayer.stop(); if (focusHelper != null) { focusHelper.abandonFocus(); } // continue backwards (kills current activity calling onDestroy) finish(); return true; } return super.onKeyDown(keyCode, event); } }