1 <resources>2     <string name="app_name">GeoQuiz</string>3 4     <string name="true_button">TRUE</string>5     <string name="false_button">FALSE</string>6     <string name="next_button">NEXT</string>7     <string name="prev_button">PREV</string>8     <string name="correct_toast">Correct!</string>9     <string name="incorrect_toast">Incorrect!</string>
10     <string name="warning_text">Are you sure you want to do this?</string>
11     <string name="show_answer_button">Show Answer</string>
12     <string name="cheat_button">Cheat!</string>
13     <string name="judgment_toast">Cheating is wrong.</string>
14     <string name="question_oceans">The Pacific Ocean is larger than the Atlantic Ocean.</string>
15     <string name="question_mideast">The Suez Canal connects the Red Sea and the Indian Ocean.</string>
16     <string name="question_africa">The source of the Nile River is in Egypt.</string>
17     <string name="question_americas">The Amazon River is the longest river in the Americas.</string>
18     <string name="question.asia">Lake Baikal is the world\'s oldest and deepest freshwater lake.</string>
19 </resources>

 1     @Override2     protected void onCreate(Bundle savedInstanceState) {3         super.onCreate(savedInstanceState);4         Log.d(TAG, "onCreate(Bundle) called");5         setContentView(R.layout.activity_quiz);6 7         if (savedInstanceState != null) {8             mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);9         }
10
11         mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
12
13         mTrueButton = (Button) findViewById(R.id.true_button);
14         mTrueButton.setOnClickListener(new View.OnClickListener() {
15             @Override
16             public void onClick(View v){
17                 checkAnswer(true);
18             }
19         });
20         mFalseButton = (Button) findViewById(R.id.false_button);
21         mFalseButton.setOnClickListener(new View.OnClickListener() {
22             @Override
23             public void onClick(View v){
24                 checkAnswer(false);
25             }
26         });
27
28         mNextButton = (Button) findViewById(R.id.next_button);
29         mNextButton.setOnClickListener(new View.OnClickListener() {
30             @Override
31             public void onClick(View v) {
32                 mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
33                 mIsCheater = false;
34                 updateQuestion();
35             }
36         });
37
38         mPrevButton = (Button) findViewById(R.id.prev_button);
39         mPrevButton.setOnClickListener(new View.OnClickListener() {
40             @Override
41             public void onClick(View v) {
42                 mCurrentIndex = (mCurrentIndex - 1) % mQuestionBank.length;
43                 updateQuestion();
44             }
45         });
46
47         mCheatButton = (Button)findViewById(R.id.cheat_button);
48         mCheatButton.setOnClickListener(new View.OnClickListener() {
49             @Override
50             public void onClick(View v) {
51                 boolean answerIsTrue = mQuestionBank[mCurrentIndex].ismAnswerTrue();
52                 Intent intent = CheatActivity.newIntent(QuizActivity.this, answerIsTrue);
53                 startActivityForResult(intent, REQUEST_CODE_CHEAT);
54             }
55         });
56
57         updateQuestion();
58
59     }

 1 public class Question {2     private int mTextResId;3     private boolean mAnswerTrue;4 5     public Question(int textResId, boolean answerTrue){6         mTextResId = textResId;7         mAnswerTrue = answerTrue;8     }9
10     public int getmTextResId() {
11         return mTextResId;
12     }
13
14     public void setmTextResId(int mTextResId) {
15         this.mTextResId = mTextResId;
16     }
17
18     public boolean ismAnswerTrue() {
19         return mAnswerTrue;
20     }
21
22     public void setmAnswerTrue(boolean mAnswerTrue) {
23         this.mAnswerTrue = mAnswerTrue;
24     }
25 }

图1.3-2

1.4 Activity的生命周期

在项目中主要使用的Activity的生命周期如图1.4-1所示。

图1.4-1

1.5 CHEAT按钮的关联界面

在activity_cheat.xml中编写的组件代码如下所示。

 1 <?xml version="1.0" encoding="utf-8"?>2 3 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"4                 xmlns:tools="http://schemas.android.com/tools"5     android:layout_width="match_parent"6     android:layout_height="match_parent"7     android:orientation="vertical"8     android:gravity="center"9     tools:context="classroom.geoquiz.CheatActivity">
10
11     <TextView
12         android:layout_width="wrap_content"
13         android:layout_height="wrap_content"
14         android:padding="24dp"
15         android:text="@string/warning_text"/>
16
17     <TextView
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:id="@+id/answer_text_view"
21         android:padding="24dp"
22         tools:text="Answer"/>
23
24     <Button
25         android:id="@+id/show_answer_button"
26         android:layout_width="wrap_content"
27         android:layout_height="wrap_content"
28         android:text="@string/show_answer_button"/>
29
30 </LinearLayout>

1.6 备注

以下是项目过程开发中遇到的问题。

1.6.1 Gradle文件下载速度慢

buildscript {repositories {maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'} } } allprojects { repositories { maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'} } }