1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.example.android.lunarlander;
18 
19 import android.app.Activity;
20 import android.os.Bundle;
21 import android.util.Log;
22 import android.view.Menu;
23 import android.view.MenuItem;
24 import android.widget.TextView;
25 
26 import com.example.android.lunarlander.LunarView.LunarThread;
27 
28 /**
29  * This is a simple LunarLander activity that houses a single LunarView. It
30  * demonstrates...
31  * <ul>
32  * <li>animating by calling invalidate() from draw()
33  * <li>loading and drawing resources
34  * <li>handling onPause() in an animation
35  * </ul>
36  */
37 public class LunarLander extends Activity {
38     private static final int MENU_EASY = 1;
39 
40     private static final int MENU_HARD = 2;
41 
42     private static final int MENU_MEDIUM = 3;
43 
44     private static final int MENU_PAUSE = 4;
45 
46     private static final int MENU_RESUME = 5;
47 
48     private static final int MENU_START = 6;
49 
50     private static final int MENU_STOP = 7;
51 
52     /** A handle to the thread that's actually running the animation. */
53     private LunarThread mLunarThread;
54 
55     /** A handle to the View in which the game is running. */
56     private LunarView mLunarView;
57 
58     /**
59      * Invoked during init to give the Activity a chance to set up its Menu.
60      *
61      * @param menu the Menu to which entries may be added
62      * @return true
63      */
64     @Override
onCreateOptionsMenu(Menu menu)65     public boolean onCreateOptionsMenu(Menu menu) {
66         super.onCreateOptionsMenu(menu);
67 
68         menu.add(0, MENU_START, 0, R.string.menu_start);
69         menu.add(0, MENU_STOP, 0, R.string.menu_stop);
70         menu.add(0, MENU_PAUSE, 0, R.string.menu_pause);
71         menu.add(0, MENU_RESUME, 0, R.string.menu_resume);
72         menu.add(0, MENU_EASY, 0, R.string.menu_easy);
73         menu.add(0, MENU_MEDIUM, 0, R.string.menu_medium);
74         menu.add(0, MENU_HARD, 0, R.string.menu_hard);
75 
76         return true;
77     }
78 
79     /**
80      * Invoked when the user selects an item from the Menu.
81      *
82      * @param item the Menu entry which was selected
83      * @return true if the Menu item was legit (and we consumed it), false
84      *         otherwise
85      */
86     @Override
onOptionsItemSelected(MenuItem item)87     public boolean onOptionsItemSelected(MenuItem item) {
88         switch (item.getItemId()) {
89             case MENU_START:
90                 mLunarThread.doStart();
91                 return true;
92             case MENU_STOP:
93                 mLunarThread.setState(LunarThread.STATE_LOSE,
94                         getText(R.string.message_stopped));
95                 return true;
96             case MENU_PAUSE:
97                 mLunarThread.pause();
98                 return true;
99             case MENU_RESUME:
100                 mLunarThread.unpause();
101                 return true;
102             case MENU_EASY:
103                 mLunarThread.setDifficulty(LunarThread.DIFFICULTY_EASY);
104                 return true;
105             case MENU_MEDIUM:
106                 mLunarThread.setDifficulty(LunarThread.DIFFICULTY_MEDIUM);
107                 return true;
108             case MENU_HARD:
109                 mLunarThread.setDifficulty(LunarThread.DIFFICULTY_HARD);
110                 return true;
111         }
112 
113         return false;
114     }
115 
116     /**
117      * Invoked when the Activity is created.
118      *
119      * @param savedInstanceState a Bundle containing state saved from a previous
120      *        execution, or null if this is a new execution
121      */
122     @Override
onCreate(Bundle savedInstanceState)123     protected void onCreate(Bundle savedInstanceState) {
124         super.onCreate(savedInstanceState);
125 
126         // tell system to use the layout defined in our XML file
127         setContentView(R.layout.lunar_layout);
128 
129         // get handles to the LunarView from XML, and its LunarThread
130         mLunarView = (LunarView) findViewById(R.id.lunar);
131         mLunarThread = mLunarView.getThread();
132 
133         // give the LunarView a handle to the TextView used for messages
134         mLunarView.setTextView((TextView) findViewById(R.id.text));
135 
136         if (savedInstanceState == null) {
137             // we were just launched: set up a new game
138             mLunarThread.setState(LunarThread.STATE_READY);
139             Log.w(this.getClass().getName(), "SIS is null");
140         } else {
141             // we are being restored: resume a previous game
142             mLunarThread.restoreState(savedInstanceState);
143             Log.w(this.getClass().getName(), "SIS is nonnull");
144         }
145     }
146 
147     /**
148      * Invoked when the Activity loses user focus.
149      */
150     @Override
onPause()151     protected void onPause() {
152         mLunarView.getThread().pause(); // pause game when Activity pauses
153         super.onPause();
154     }
155 
156     /**
157      * Notification that something is about to happen, to give the Activity a
158      * chance to save state.
159      *
160      * @param outState a Bundle into which this Activity should save its state
161      */
162     @Override
onSaveInstanceState(Bundle outState)163     protected void onSaveInstanceState(Bundle outState) {
164         // just have the View's thread save its state into our Bundle
165         super.onSaveInstanceState(outState);
166         mLunarThread.saveState(outState);
167         Log.w(this.getClass().getName(), "SIS called");
168     }
169 }
170