java - 如何在问答游戏中保持得分？

Question

我创建了一个问答游戏，我需要在不创建任何数据库的情况下保持得分。我为每个问题创建了一个单独的 Activity 和 .xml，用户需要在文本字段中输入答案，如果答案正确，它会自动转到下一个 Activity (即下一个问题)。现在，我需要以这样一种方式保持分数，即在用户输入正确答案后，分数应显示在屏幕的右上角。我怎么做？请帮忙。这是我的第一级第二个问题的 java Activity 和 xml 文件:

package com.golo.user.gaunkhanekatha;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Handler;



public class TwoActivity extends Activity {

    public Button check;
    public EditText typeh;
    private Toast toast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_two);
        toast = Toast.makeText(TwoActivity.this, "", Toast.LENGTH_SHORT);
        check = (Button)findViewById(R.id.check1); //R.id.button is the id on your xml
        typeh = (EditText)findViewById(R.id.type1); //this is the EditText id
        check.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                //Here you must get the text on your EditText
                String Answer = (String) typeh.getText().toString(); //here you have the text typed by the user
                //You can make an if statement to check if it's correct or not
                if(Answer.equals("piano") || (Answer.equals("keyboard")))
                {
                    ///Correct Toast
                    toast.setText("Correct! Now, next question...");
                    toast.setGravity(Gravity.TOP | Gravity.LEFT, 500, 300);
                    toast.show();
                    Intent i = new Intent(TwoActivity.this, ThreeActivity.class);
                    startActivity(i);
                    finish();

                }
                else{
                    //It's not the correct answer
                    toast.setText("Wrong! Try Again!");
                    toast.setGravity(Gravity.TOP | Gravity.LEFT, 500, 300);
                    toast.show();
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(toast!= null) {
            toast.cancel();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_aboutus, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

xml文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    android:weightSum="1"
    android:textAlignment="center"
    android:id="@+id/level1">

    <TextView
        android:layout_width="300dp"
        android:layout_height="200dp"
        android:text="What has 88 keys but cannot open a single door?"
        android:id="@+id/que1"
        android:width="255dp"
        android:textSize="30dp"
        android:layout_margin="50dp"
        android:textStyle="italic"
        android:gravity="center" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/type1"
        android:layout_gravity="center_horizontal"
        android:hint="Type here..." />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check answer..."
        android:id="@+id/check1"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

Answer 1

如果您希望在运行之间保留分数，您可以使用类似以下内容的内容将分数写入文本文件: How do I create a file and write to it in Java?

然后当你想显示分数时从中读取: Java: How to read a text file

或者，如果您只想在应用程序运行期间维护分数，则可以使用分数的单例。如:

public class Score {

    private static int score = 0;

    //So that this class can't be instantiated
    private Score () {
    }

    //Return current score
    public static int getScore() {
        return score;
    }

    //Increment score
    public static void increaseScoreByOne() {
        score = score++;
    }

    //Decrement score
    public static void decreaseScoreByOne() {
        score = score--;
    }

    //Reset score back to 0
    public static void resetScore() {
        score = 0;
    }
}

然后可以通过调用在应用程序的任何地方访问它:

Score.getScore();
Score.increaseScoreByOne();
Score.decreaseScoreByOne();
Score.resetScore();