Android与MAC设计模式相关操作

Android与MAC设计模式相关操作

1.创建新类
在项目工具窗口中，选择New——Java Class，命名为Question，然后点OK按钮。

2.类的命名
将名字修改为Question即可

3.新增变量与构造方法
在Question.java中新增两个成员变量 及一个构造方法
代码如下

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

    public boolean isAnswerTrue() {
        return mAnswerTrue;
    }

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

    public int getTextResId() {
        return mTextResId;
    }

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

    public Question(int textResId, boolean answerTrue) {
        mTextResId = textResId;
        mAnswerTrue = answerTrue;
    }
}

4.生成getter方法和setter方法
操作：File——Setting，依次展开Editor和Code Style选项，在Java选项下选择Code Generation选项，添加如下内容。

设置好后，回到Question.Java中，右击构造方法区，选择Generate——Getter and Setter，选择mTextResId和mAnswerTrue,为每个变量都生成getter方法和setter方法，单击OK。代码如下

5.Android 与 MVC 设计模式及更新新图层
对activity_main.xml进行操作
完整代码如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/question_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="24dp" />


    <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>

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

</LinearLayout>

6.更新控制层
对QuizActivity.Java进行修改

完整代码如下：

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 MainActivity extends AppCompatActivity {
    private Button mTrueButton;
    private Button mFalseButton;
    private Button mNextButton;
    private TextView mQuestionTextView;

    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_americas,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_main);
        mQuestionTextView = (TextView) findViewById(R.id.question_text_view);

        mTrueButton = (Button) findViewById(R.id.true_button);
        mTrueButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               checkAnsewer(true);
            }
        });

        mFalseButton = (Button) findViewById(R.id.false_button);
        mFalseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                checkAnsewer(false);
            }
        });
        mNextButton = (Button) findViewById(R.id.next_button);
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;

                updateQuestion();
            }
        });
        updateQuestion();
    }
    private void updateQuestion() {
        int question = mQuestionBank[mCurrentIndex].getTextResId();
        mQuestionTextView.setText(question);
    }
    private void checkAnsewer(boolean userPressedTrue) {
        boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();

        int messageResId = 0;

        if (userPressedTrue == answerIsTrue) {
            messageResId = R.string.correct_toast;
        } else {
            messageResId = R.string.incorrect_toast;
        }
        Toast.makeText(this,messageResId, Toast.LENGTH_SHORT).show();
    }
}

strings.xml 修改

<resources>
    <string name="app_name">1C-B7-2C-38-5F-8A 04 2</string>
    <string name="question_australia">Ganberra 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="correct_toast">Correct!</string>
    <string name="incorrect_toast">Incorrect!</string>
    <string name="next_button">NEXT</string>
</resources>

7.运行结果

最后

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