[移动开发]Android studio基础练习03【问答判断题】

关于一个刷题软件的简易功能实现

自己建项目名GeoQuiz , 不多说了，直接上代码了。。。

1. activity_quiz.xml布局及代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    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=".QuizActivity">

    <TextView
        android:id="@+id/tvQuestion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

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

        <Button
            android:id="@+id/btnTrue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="True" />

        <Button
            android:id="@+id/btnFalse"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="False" />

    </LinearLayout>

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

        <Button
            android:id="@+id/btnPrev"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Prev" />

        <Button
            android:id="@+id/btnNext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Next" />

    </LinearLayout>


</LinearLayout>

?2. strings.xml代码实现

<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 Oceans</string>
    <string name="question_africa">The source of the Nile River is in Egypt</string>
    <string name="question_america">The Amazon River is the longest river in the America</string>
    <string name="question_asia">Lake Baikal is the world\'s oldest and deepest freshwater lake</string>
</resources>

3. Question代码实现

package com.example.geoquiz;

public class Question {
    private int mTextResId;
    private boolean mAnswerTrue;

    public int getTextResId() {
        return mTextResId;
    }

    public void setTextResId(int textResId) {
        this.mTextResId = mTextResId;
    }

    public boolean isAnswerTrue() {
        return mAnswerTrue;
    }

    public void setAnswerTrue(boolean answerTrue) {
        this.mAnswerTrue = mAnswerTrue;
    }

    public Question(int mTextResId, boolean mAnswerTrue) {
        this.mTextResId = mTextResId;
        this.mAnswerTrue = mAnswerTrue;
    }
}

4. QuizActivity代码实现

package com.example.geoquiz;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class QuizActivity extends AppCompatActivity {
    private Button mTrueButton;
    private Button mFalseButton;
    private Button mNextButton;
    private Button mPrevButton;
    private TextView mQuestionText;
    private Question[] mQuestionBank = new Question[]{
            new Question(R.string.question_australia, true),
            new Question(R.string.question_oceans, true),
            new Question(R.string.question_mideast, false),
            new Question(R.string.question_africa, false),
            new Question(R.string.question_america, true),
            new Question(R.string.question_asia, true)

    };
    private int mCurrentIndex = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quiz);
        mTrueButton = findViewById(R.id.btnTrue);
        mFalseButton = findViewById(R.id.btnFalse);
        mQuestionText = findViewById(R.id.tvQuestion);
        mNextButton = findViewById(R.id.btnNext);
        mPrevButton = findViewById(R.id.btnPrev);

        mTrueButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                boolean answer = mQuestionBank[mCurrentIndex].isAnswerTrue();
                if (answer == true)
                    Toast.makeText(QuizActivity.this,
                            "回答正确",
                            Toast.LENGTH_SHORT).show();
                else
                    Toast.makeText(QuizActivity.this,
                            "回答错误",
                            Toast.LENGTH_SHORT).show();
//                Toast.makeText(MainActivity.this,
//                "Click True",
//                Toast.LENGTH_SHORT).show();
            }
        });

        mFalseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                boolean answer = mQuestionBank[mCurrentIndex].isAnswerTrue();
                if (answer == true)
                    Toast.makeText(QuizActivity.this,
                            "回答错误",
                            Toast.LENGTH_SHORT).show();
                else
                    Toast.makeText(QuizActivity.this,
                            "回答正确",
                            Toast.LENGTH_SHORT).show();
//                Toast.makeText(MainActivity.this,
//                        "Click False",
//                        Toast.LENGTH_SHORT).show();
            }
        });

        mQuestionText.setText(mQuestionBank[mCurrentIndex].getTextResId());
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                mQuestionText.setText(mQuestionBank[mCurrentIndex].getTextResId());
            }
        });

        mPrevButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCurrentIndex = (mCurrentIndex - 1);
                if (mCurrentIndex < 0)
                    mCurrentIndex = 0;
                mQuestionText.setText(mQuestionBank[mCurrentIndex].getTextResId());
            }
        });
    }
}

5.效果展示 GeoQuiz