一、实验要内容

1. 请给MiniQuiz增加一个Activity，在这个新增的Activity提示答案；

2. 再新增一个Activty，答完最后一个题目的时候，提示用户一共回答正确和错误的汇总情况，以及使用了提示答案的情况；再这个新增的Acity中共用户选择“退出程序”或者“重新开始答题”。

3. 在整个运行过程中，请使用Log显示Activity生命周期状态变化，并在实验报告中分析其状态变化的条件和原因。

4.在以上程序运行的过程中，进行横屏和竖屏的切换，要求，无论程序在什么时候切换，都可以正确运行。

二、结构搭建

三、代码实现

  activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http:///apk/res/android"
    xmlns:app="http:///apk/res-auto"
    xmlns:tools="http:///tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".QuizActivity">

    <TextView
        android:id="@+id/tvQuestion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:drawablePadding="24dp"
        android:text="题目问题"
        android:textSize="14sp" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        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="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btnPrev"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="上一题" />

        <Button
            android:id="@+id/btnNext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="下一题" />

    </LinearLayout>

    <Button
        android:id="@+id/btnAnswer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查看答案" />
</LinearLayout>

  activity_answer.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http:///apk/res/android"
    xmlns:app="http:///apk/res-auto"
    xmlns:tools="http:///tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".AnswerActivity">

    <TextView
        android:id="@+id/tvAnswer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="题目答案"
        android:textSize="14sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>

  activity_exit.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http:///apk/res/android"
    xmlns:app="http:///apk/res-auto"
    xmlns:tools="http:///tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".ExitActivity">

    <TextView
        android:id="@+id/tvTrueFalseAcc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="答对、答错、正确率"
        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/btnRestart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="重新开始" />

        <Button
            android:id="@+id/btnExit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="退出程序" />

    </LinearLayout>

    <TextView
        android:id="@+id/tvQuestion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="所有题目均已答完"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</LinearLayout>

   strings.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 Cannal 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>

    <string-array name="questions">
        <item>Canberra is the capital of Australia</item>
        <item>The Pacific Ocean is larger than the Atlantic Ocean</item>
        <item>The Suez Canal connects the Red Sea and the Indian Oceans</item>
        <item>The source of the Nile River is in Egypt</item>
        <item>The Amazon River is the longest river in the America</item>
        <item>Lake Baikal is the world\'s oldest and deepest freshwater lake</item>
    </string-array>

    <string-array name="answers">
        <item>true</item>
        <item>true</item>
        <item>false</item>
        <item>false</item>
        <item>true</item>
        <item>true</item>
    </string-array>
</resources>

  QuizActivity

package com.example.geoquiz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
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 Button mAnswerButton;

    private static final String TAG = "QuizActivity";

    private Boolean[] IsAnswered;
    private int rightCount = 0;
    private int wrongCount = 0;
    private int mCurrentIndex = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.i(TAG, "onCreate() called");

        String[] Answers = getResources().getStringArray(R.array.answers);
        String[] Questions = getResources().getStringArray(R.array.questions);
        int QuestionCount = Questions.length;
        IsAnswered = new Boolean[QuestionCount];

        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);
        mAnswerButton = findViewById(R.id.btnAnswer);

        for (int i = 0; i < QuestionCount; i++) {
            IsAnswered[i] = false;
        }

        //判断题目为正确的按钮
        mTrueButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String answer = Answers[mCurrentIndex];
                IsAnswered[mCurrentIndex] = true;
                if (answer.equals("true")) {
                    Toast.makeText(QuizActivity.this,
                            "回答正确",
                            Toast.LENGTH_SHORT).show();
                    rightCount++;
                } else {
                    Toast.makeText(QuizActivity.this,
                            "回答错误",
                            Toast.LENGTH_SHORT).show();
                    wrongCount++;
                }
                initButtonStatus();
            }
        });

        //判断题目为错误的按钮
        mFalseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (IsAnswered[mCurrentIndex])
                    return;
                String answer = Answers[mCurrentIndex];
                IsAnswered[mCurrentIndex] = true;
                if (answer.equals("true")) {
                    Toast.makeText(QuizActivity.this,
                            "回答错误",
                            Toast.LENGTH_SHORT).show();
                    wrongCount++;
                } else {
                    Toast.makeText(QuizActivity.this,
                            "回答正确",
                            Toast.LENGTH_SHORT).show();
                    rightCount++;
                }
                initButtonStatus();
            }
        });

        //题目显示
        mQuestionText.setText(Questions[mCurrentIndex]);

        //选择下一题的按钮
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCurrentIndex = mCurrentIndex + 1;
                if (mCurrentIndex == QuestionCount) {
                    mCurrentIndex = mCurrentIndex - 1;
                    if (rightCount + wrongCount == QuestionCount) {
                        String result = "共答对了" + rightCount + "题\n" +
                                "答错了" + wrongCount + "题\n" +
                                "正确率为：" + (float) rightCount / QuestionCount * 100 +
                                "%";

                        Toast.makeText(QuizActivity.this,
                                result,
                                Toast.LENGTH_SHORT).show();

                        Intent intent = new Intent(QuizActivity.this, ExitActivity.class);
                        intent.putExtra("TrueFalseAcc", result);
                        startActivity(intent);

                        finish();
                    }
                }
                mQuestionText.setText(Questions[mCurrentIndex]);
                initButtonStatus();
            }
        });

        //选择上一题的按钮
        mPrevButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCurrentIndex = (mCurrentIndex - 1);
                if (mCurrentIndex < 0)
                    mCurrentIndex = 0;
                mQuestionText.setText(Questions[mCurrentIndex]);
                initButtonStatus();
            }

        });

        //查看答案的按钮
        mAnswerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //取出题目和答案
                String answer = Answers[mCurrentIndex];
                String question = Questions[mCurrentIndex];
                //创建QuizActivity类和AnswerActivity类的连接信封
                Intent intent = new Intent(QuizActivity.this, AnswerActivity.class);
                //在intent连接信封中附加消息
                intent.putExtra("QuestionAnswer", question + "\n答案为: " + answer);
                startActivity(intent);
                Toast.makeText(QuizActivity.this,
                        "答案:" + answer,
                        Toast.LENGTH_SHORT).show();
            }
        });
    }

    //按钮状态不可使用(灰色)
    private void initButtonStatus() {
        mTrueButton.setEnabled(!IsAnswered[mCurrentIndex]);
        mFalseButton.setEnabled(!IsAnswered[mCurrentIndex]);
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.i(TAG, "onStart() called");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i(TAG, "onStop() called");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "onDestroy() called");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG, "onPause() called");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "onResume() called");
    }
}

  Question 

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;
    }
}

AnswerActivity

package com.example.geoquiz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class AnswerActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_answer);
        //获得intent引用
        Intent intent = getIntent();
        //根据KEY取出value
        String message = intent.getStringExtra("QuestionAnswer");
        //获得文本框引用，设置文字
        TextView mAnswerText = findViewById(R.id.tvAnswer);
        mAnswerText.setText(message);
    }
}

ExitActivity

package com.example.geoquiz;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class ExitActivity extends AppCompatActivity {

    private TextView tvQuestion;
    private Button btnRestart;
    private Button btnExit;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_exit);

        //获得intent引用
        Intent intent = getIntent();
        //根据KEY取出value
        String TrueFalseAcc = intent.getStringExtra("TrueFalseAcc");
        //获得文本框引用，设置文字
        TextView mTrueFalseAcc = findViewById(R.id.tvTrueFalseAcc);
        mTrueFalseAcc.setText(TrueFalseAcc);

        initView();
        btnRestart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
                startActivity(new Intent(ExitActivity.this, QuizActivity.class));
            }
        });

        btnExit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });


    }

    private void initView() {
        tvQuestion = (TextView) findViewById(R.id.tvQuestion);
        btnRestart = (Button) findViewById(R.id.btnRestart);
        btnExit = (Button) findViewById(R.id.btnExit);
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http:///apk/res/android"
    package="com.example.geoquiz">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:screenOrientation="landscape"
        android:supportsRtl="true"
        android:theme="@style/Theme.GeoQuiz">
        <activity
            android:name="com.example.geoquiz.ExitActivity"
            android:exported="false" />
        <activity
            android:name="com.example.geoquiz.AnswerActivity"
            android:exported="false" />
        <activity
            android:name="com.example.geoquiz.QuizActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

四、运行结果