Android开发 第一个app

MainActivity：

package com.example.my_app;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Button mTrueButton;
    private Button mFalseButton;
    private ImageButton mNextButton;
    private ImageButton mBackButton;
    private Button mCheatButton;
    private TextView mQuestionTextView;
    private static final String TAG = "MainActivity";
    private static final String KEY_INDEX = "index";
    private static final String Is_Cheat = "cheat";
    private static final String CHOOSE = "choose";
    private static final String FINISH = "finish";
    private static final String RIGHT = "right";
    private static final String WRONG = "wrong";
    private static final String CHEAT_Q = "cheating";
    private static final int REQUEST_CODE_CHEAT = 0;
    private static  final int REQUEST_CODE_COMMAND = 1;
    private int mCurrentIndex = 0;//当前问题下标
    private int right_q = 0;
    private int wrong_q = 0;
    private int cheat_q = 0;
    private int command = 0;
    private int finish = 0;
    private boolean[] mCheat = new boolean[5];
    private int[] mChoose = new int[]{0,0,0,0,0};

    private Question[] mQuestionBank = new Question[]{//问题数组
            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_americas, true),
            new Question(R.string.question_asia, true),
    };

    private void updateQuestion() {//更新问题
        int question = mQuestionBank[mCurrentIndex].getTextResId();
        mQuestionTextView.setText(question);
    }


    private void checkAnswer(boolean userPressedTrue){//检验答案是否正确
        boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();

        int messageResid = 0;

        if(mCheat[mCurrentIndex]){//如果这道题作弊了
            //mNowState[mCurrentIndex] = 1;
            messageResid = R.string.judgment_toast;
        }else{
            if (userPressedTrue == answerIsTrue) {
                messageResid = R.string.correct_toast;
                if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                    mTrueButton.setBackgroundColor(Color.GREEN);
                    mFalseButton.setBackgroundColor(Color.LTGRAY);
                }else{
                    mTrueButton.setBackgroundColor(Color.LTGRAY);
                    mFalseButton.setBackgroundColor(Color.GREEN);
                }
                right_q++;
                mChoose[mCurrentIndex] = 1;//说明这道题答对了
            } else {
                if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                    mTrueButton.setBackgroundColor(Color.LTGRAY);
                    mFalseButton.setBackgroundColor(Color.RED);
                }else{
                    mTrueButton.setBackgroundColor(Color.RED);
                    mFalseButton.setBackgroundColor(Color.LTGRAY);
                }
                messageResid = R.string.incorrect_toast;
                wrong_q++;
                mChoose[mCurrentIndex] = 2;//说明这道题打错了
            }
            finish++;
         }
        Toast.makeText(this, messageResid, Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){//处理返回结果
        if(resultCode != Activity.RESULT_OK){
            return;
        }

        if(requestCode == REQUEST_CODE_CHEAT){
            if(data == null){
                return;
            }
            mCheat[mCurrentIndex] = CheatActivity.wasAnswerShown(data);//判断这道题是否作弊
            cheat_q++;
            finish++;
        }

        if(requestCode == REQUEST_CODE_COMMAND){
            if(data == null){
                return;
            }
            command = ResultActivity.wasCommand(data);
            System.out.println(command);
            if(command == 1){
                command = 0;
                finish();
            }else if(command == 2){
                command = 0;
                for(int i = 0; i < 5; i++){
                    mCheat[i] = false;
                    //mNowState[i] = 0;
                    mChoose[i] = 0;
                }
                mCurrentIndex = 0;
                updateQuestion();
                mTrueButton.setBackgroundColor(Color.LTGRAY);
                mFalseButton.setBackgroundColor(Color.LTGRAY);
                right_q = wrong_q = cheat_q = 0;
                finish = 0;
            }
        }
    }

    public boolean judge_Repeat(){//检查是否重复选择
        if(mChoose[mCurrentIndex] != 0){
            int repeat_id = R.string.repeat;
            Toast.makeText(this, repeat_id, Toast.LENGTH_SHORT).show();
            return true;
        }
        return false;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate(Bundle) called");
        setContentView(R.layout.activity_main);
        System.out.println(command + " 2222");
        for(int i = 0; i < 5; i++){
            mCheat[i] = false;
        }

        mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
        mQuestionTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {//给文本框添加事件
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                updateQuestion();
                if(mChoose[mCurrentIndex] == 1){//说明做对了
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.GREEN);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }else{
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.GREEN);
                    }
                }else if(mChoose[mCurrentIndex] == 2){
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.RED);
                    }else{
                        mTrueButton.setBackgroundColor(Color.RED);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }
                }else{
                    mTrueButton.setBackgroundColor(Color.LTGRAY);
                    mFalseButton.setBackgroundColor(Color.LTGRAY);
                }
            }
        });

        mTrueButton = (Button) findViewById(R.id.true_button);
        mTrueButton.setOnClickListener(new View.OnClickListener() {//给true按钮添加事件
            @Override
            public void onClick(View view) {
                if(judge_Repeat() == true){
                    return;
                }
                checkAnswer(true);
                if(finish == 5) {
                    Intent i = ResultActivity.newIntent(MainActivity.this, right_q, wrong_q, cheat_q);
                    startActivityForResult(i, REQUEST_CODE_COMMAND);
                }
            }
        });

        mFalseButton = (Button) findViewById(R.id.false_button);
        mFalseButton.setOnClickListener(new View.OnClickListener() {//给false按钮添加事件
            @Override
            public void onClick(View view) {
                if(judge_Repeat() == true){
                    return;
                }
                checkAnswer(false);
                if(finish == 5) {
                    Intent i = ResultActivity.newIntent(MainActivity.this, right_q, wrong_q, cheat_q);
                    startActivityForResult(i, REQUEST_CODE_COMMAND);
                }
            }
        });

        mNextButton = (ImageButton) findViewById(R.id.next_button);
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {//给next按钮添加事件
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                updateQuestion();
                if(mChoose[mCurrentIndex] == 1){//说明做对了
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.GREEN);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }else{
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.GREEN);
                    }
                }else if(mChoose[mCurrentIndex] == 2){
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.RED);
                    }else{
                        mTrueButton.setBackgroundColor(Color.RED);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }
                }else{
                    mTrueButton.setBackgroundColor(Color.LTGRAY);
                    mFalseButton.setBackgroundColor(Color.LTGRAY);
                }
            }
        });

        mBackButton = (ImageButton) findViewById(R.id.back_button);
        mBackButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {//给back按钮添加事件
                if(mCurrentIndex == 0){
                    mCurrentIndex = mQuestionBank.length;
                }
                mCurrentIndex = (mCurrentIndex - 1) % mQuestionBank.length;
                updateQuestion();
                if(mChoose[mCurrentIndex] == 1){//说明做对了
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.GREEN);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }else{
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.GREEN);
                    }
                }else if(mChoose[mCurrentIndex] == 2){
                    if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                        mTrueButton.setBackgroundColor(Color.LTGRAY);
                        mFalseButton.setBackgroundColor(Color.RED);
                    }else{
                        mTrueButton.setBackgroundColor(Color.RED);
                        mFalseButton.setBackgroundColor(Color.LTGRAY);
                    }
                }else{
                    mTrueButton.setBackgroundColor(Color.LTGRAY);
                    mFalseButton.setBackgroundColor(Color.LTGRAY);
                }
            }
        });

        mCheatButton = (Button)findViewById(R.id.cheat_button);
        mCheatButton.setOnClickListener(new View.OnClickListener() {//给cheat按钮添加事件
            @Override
            public void onClick(View view) {
                boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
                Intent i = CheatActivity.newIntent(MainActivity.this, answerIsTrue);
                startActivityForResult(i, REQUEST_CODE_CHEAT);//发送请求
            }
        });

        if(savedInstanceState != null) {
            mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
            mChoose = savedInstanceState.getIntArray(CHOOSE);
            finish = savedInstanceState.getInt(FINISH);
            right_q = savedInstanceState.getInt(RIGHT);
            wrong_q = savedInstanceState.getInt(WRONG);
            cheat_q = savedInstanceState.getInt(CHEAT_Q);
            mCheat = savedInstanceState.getBooleanArray(Is_Cheat);
        }

        /*for(int i = 0; i < 5; i++){
            if(mNowState[i] != 0) {
                mCheat[i] = true;
            }else{
                mCheat[i] = false;
            }
        }*/

        if(mChoose[mCurrentIndex] == 1){//说明做对了
            if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                mTrueButton.setBackgroundColor(Color.GREEN);
                mFalseButton.setBackgroundColor(Color.GRAY);
            }else{
                mTrueButton.setBackgroundColor(Color.GRAY);
                mFalseButton.setBackgroundColor(Color.GREEN);
            }
        }else if(mChoose[mCurrentIndex] == 2){
            if(mQuestionBank[mCurrentIndex].isAnswerTrue() == true) {
                mTrueButton.setBackgroundColor(Color.LTGRAY);
                mFalseButton.setBackgroundColor(Color.RED);
            }else{
                mTrueButton.setBackgroundColor(Color.RED);
                mFalseButton.setBackgroundColor(Color.LTGRAY);
            }
        }else{
            mTrueButton.setBackgroundColor(Color.LTGRAY);
            mFalseButton.setBackgroundColor(Color.LTGRAY);
        }
        updateQuestion();
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        Log.i(TAG, "onSaveInstanceState");
        savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
        //savedInstanceState.putIntArray(Is_Cheat, mNowState);
        savedInstanceState.putBooleanArray(Is_Cheat, mCheat);
        savedInstanceState.putIntArray(CHOOSE, mChoose);
        savedInstanceState.putInt(FINISH, finish);
        savedInstanceState.putInt(RIGHT, right_q);
        savedInstanceState.putInt(WRONG, wrong_q);
        savedInstanceState.putInt(CHEAT_Q, cheat_q);
    }


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

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

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

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

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

}

CheatActivity:

package com.example.my_app;

import androidx.appcompat.app.AppCompatActivity;

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

public class CheatActivity extends AppCompatActivity {

    private static final String EXTRA_ANSWER_IS_TRUE = "com.example.my_app.answer_is_true";
    private static final String EXTRA_ANSWER_SHOWN = "com.example.my_app.answer_shown";
    private static final String Is_Cheat = "cheat";
    private static final String TAG = "CheatActivity";
    private boolean mAnswerIsTrue;
    private TextView mAnswerTextView;
    private Button mShowAnswer;
    private int mNowState = 0;


    public static Intent newIntent(Context packageContext, boolean answerIsTrue) {
        Intent i = new Intent(packageContext, CheatActivity.class);
        i.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
        return i;
    }

    public void setAnswerShownResult(boolean isAnswerShown) {
        Intent data = new Intent();
        data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
        setResult(RESULT_OK, data);
    }

    public static boolean wasAnswerShown(Intent result) {
        return result.getBooleanExtra(EXTRA_ANSWER_SHOWN, false);
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        Log.i(TAG, "onSaveInstanceState");
        savedInstanceState.putInt(Is_Cheat, mNowState);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cheat);
        mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);//获取extra信息

        mAnswerTextView = (TextView) findViewById(R.id.answer_text_view);

        mShowAnswer = (Button) findViewById(R.id.show_answer_button);
        mShowAnswer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mNowState = 1;
                if(mAnswerIsTrue){
                    mAnswerTextView.setText(R.string.true_button);
                }else{
                    mAnswerTextView.setText(R.string.false_button);
                }
                setAnswerShownResult(true);
            }
        });

        if(savedInstanceState != null){
            mNowState = savedInstanceState.getInt(Is_Cheat, 0);
        }
        if(mNowState == 1){
            if(mAnswerIsTrue){
                mAnswerTextView.setText(R.string.true_button);
            }else{
                mAnswerTextView.setText(R.string.false_button);
            }
            setAnswerShownResult(true);
        }
    }
}

ResultActivity:

package com.example.my_app;

import androidx.appcompat.app.AppCompatActivity;

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

import org.w3c.dom.Text;

public class ResultActivity extends AppCompatActivity {
    private static final String EXTRA_RIGHT_Q = "com.example.my_app.right_q";
    private static final String EXTRA_WRONG_Q = "com.example.my_app.wrong_q";
    private static final String EXTRA_CHEAT_Q = "com.example.my_app.cheat_q";
    private static final String EXTRA_COMMAND = "com.example.my_app.command";
    private int right_q, wrong_q, cheat_q;
    private Button mQuit;
    private Button mRestart;
    private TextView mTextCongratulation;
    private TextView mTextResult;
    private TextView mTextRight;
    private TextView mTextWrong;
    private TextView mTextCheat;
    //private int command = 0; 1代表退出，2代表重新做题

    public static Intent newIntent(Context packageContext, int right_q, int wrong_q, int cheat_q) {
        Intent i = new Intent(packageContext, ResultActivity.class);
        i.putExtra(EXTRA_RIGHT_Q, right_q);
        i.putExtra(EXTRA_WRONG_Q, wrong_q);
        i.putExtra(EXTRA_CHEAT_Q, cheat_q);
        return i;
    }

    public void check() {
        if(right_q == 5){
            mTextCongratulation = (TextView) findViewById(R.id.congratulation);
            mTextCongratulation.setText(R.string.congratulation);
        }else{
            mTextResult = (TextView) findViewById(R.id.result);
            mTextResult.setText(R.string.result);
            mTextRight = (TextView) findViewById(R.id.right_q);
            String s = String.valueOf(right_q);
            mTextRight.setText(R.string.right_q );
            mTextRight.append(s);
            mTextWrong = (TextView) findViewById(R.id.wrong_q);
            s = String.valueOf(wrong_q);
            mTextWrong.setText(R.string.wrong_q );
            mTextWrong.append(s);
            mTextCheat = (TextView) findViewById(R.id.cheat_q);
            s = String.valueOf(cheat_q);
            mTextCheat.setText(R.string.cheat_q);
            mTextCheat.append(s);
        }
    }

    private void setCommand(int command){
        Intent data = new Intent();
        data.putExtra(EXTRA_COMMAND, command);
        setResult(RESULT_OK, data);
    }

    public static int wasCommand(Intent result){
        return result.getIntExtra(EXTRA_COMMAND, 0);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_result);

        right_q = getIntent().getIntExtra(EXTRA_RIGHT_Q, 0);
        wrong_q = getIntent().getIntExtra(EXTRA_WRONG_Q, 0);
        cheat_q = getIntent().getIntExtra(EXTRA_CHEAT_Q, 0);

        check();

        mQuit = (Button) findViewById(R.id.quit);
        mQuit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setCommand(1);//1代表退出
                finish();
            }
        });

        mRestart = (Button) findViewById(R.id.restart);
        mRestart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setCommand(2);//2代表重新开始
                finish();
            }
        });

    }
}

Question:

package com.example.my_app;

public class Question {

    private int mTextResId;
    private boolean mAnswerTrue;

    public int getTextResId() {
        return mTextResId;
    }

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

    public boolean isAnswerTrue() {
        return mAnswerTrue;
    }

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

    public Question(int textResid, boolean AnswerTrue){
        mTextResId = textResid;
        mAnswerTrue = AnswerTrue;
    }

}