Android开发初体验

Posted 2020-10-07

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);
}