Android开发初体验

第一个Androd应用-GeoQuiz,它能给出一道道地理问题，用户点击TRUE或FALSE按钮来回答屏幕上的问题，GeoQuiz及时做出反馈，首先我们来看看它完成后的样子

1.首先我们创建一个Android项目

接下来SDK的选择最低版本是4.4我选择的的是7.0，然后继续Next

选择Empty Activity,继续Next

命名activity的子类为Quizactivity,点击finsh.这样就完成了项目的创建

2.接下来就是源码，在activity_quiz.xml添加组件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              xmlns:tools="http://schemas.android.com/tools"              android:layout_width="match_parent"              android:layout_height="match_parent"              android:gravity="center"              android:orientation="vertical"              tools:context="com.bignerdranch.android.geoquiz.QuizActivity">    <TextView        android:id="@+id/question_text_view"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="24dp"        android:text="@string/question_australia"/>

<LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="horizontal">

<Button            android:id="@+id/true_button"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/true_button" />

<Button            android:id="@+id/false_button"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/false_button" />

</LinearLayout>

<LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content">

<ImageButton android:id="@+id/prev_button"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:src="@drawable/arrow_left"                     android:text="@string/prev"/>

<Button            android:id="@+id/cheat_button"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/cheat_button"/>

<ImageButton android:id="@+id/next_button"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:src="@drawable/arrow_right"                     android:text="@string/next"/>    </LinearLayout></LinearLayout>

然后是string.xml

<resources>    <string name="app_name">GeoQuiz</string>    <string name="question_australia">Canberra is the capital of Australia.</string>    <string name="question_oceans">The Pacific Ocean is larger than the Atlantic Ocean.</string>    <string name="question_mideast">The Suez Canal connects the Red Sea and the Indian Ocean.</string>    <string name="question_africa">The source of the Nile River is in Egypt.</string>    <string name="question_americas">The Amazon River is the longest river in the Americas.</string>    <string name="question_asia">Lake Baikal is the world\‘s oldest and deepest freshwater lake.</string>

<string name="true_button">True</string>    <string name="false_button">False</string>    <string name="next_button">Next</string>    <string name="correct_toast">Correct!</string>    <string name="incorrect_toast">Incorrect!</string>

<string name="warning_text">Are you sure you want to do this?</string>    <string name="show_answer_button">SHOW ANSWER</string>    <string name="cheat_button">CHEAT!</string>    <string name="judgment_toast">Cheating is wrong.</string>

<string name="next">NEXT</string>    <string name="prev">PTEV</string></resources>

和activity_cheat.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              xmlns:tools="http://schemas.android.com/tools"              android:orientation="vertical"              android:layout_width="match_parent"              android:layout_height="match_parent">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="24dp"        android:text="@string/warning_text"/>

<TextView        android:id="@+id/answer_text_view"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="24dp"        tools:text="Answer"/>

<Button        android:id="@+id/show_answer_button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/show_answer_button"/>

</LinearLayout>

3.创建数组对象，与Textview和button交互，对用户的回答做出反应

4.设置监听器@Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button); }
else {
mAnswerTextView.setText(R.string.false_button);
}
setAnswerShownResult(true);
}