主要活动数据无法使用SharedPreferences正确保存/加载

Question

如果您从左到右浏览每张图片，您会在右边的最后一张图片中注意到，测验一的分数变为0 ...这是我的问题

这是我正在与Android Studio一起使用的测验应用程序...我正在尝试使用SharedPreferences，使用putInt和getInt方法将每个测验的得分值放入变量中，并以字符串名称存储，然后onCreate的一部分是使用putInt方法中引用的字符串名称获取getInt ...当用户首次打开应用程序时，主活动应加载全0 ...当用户完成测验时，积分将传回主要活动，并且分数应该保持在该位置……如果用户继续前进，转到另一个屏幕，另一个应用程序或完全关闭该应用程序，这都没有关系，则每次测验的得分都应保持不变，但它们不会： （

当前，主活动上的每个测验按钮都会关闭主活动（finish（）;），每个测验的最后一个活动会调用主活动并传递得分分数...在主活动关闭之前，我也有每个测验按钮都调用onStop（）方法，并且onStop（）方法使用SharedPreferences.Editor和putInt方法将每个点值的值放在主要活动上...然后我在onCreate的开头有了SharedPreferences和getInt方法...

所以基本上，我想发生的事情是，每次用户单击测验按钮时，应该使用putInt方法，使用字符串名称以及我正在使用的实际int变量保存每个测验的得分。每个测验的分数，当用户完成测验后回到主要活动时，用户已经计分的任何分数都应通过getInt方法自动加载...有关程序中的一些编码，请参见下面的图片...让我知道是否有人需要查看更多代码，希望有人可以帮助我！ :)

不同的代码块，最重要的代码块与我遇到的问题有关或相关

我已经尝试了以前人们的建议，但是仍然无法正常工作...请参阅下面的代码部分，并让我知道需要解决的问题：

//Get points from Quiz One
        Bundle getFromQuizOne = getIntent().getExtras();
        if(getFromQuizOne != null)
        {
            //Get points from Quiz One
            numberQuizOnePoints = getFromQuizOne.getInt("PointsFromAllQuizOne");

            SharedPreferences shareInt = getApplicationContext().getSharedPreferences(QUIZ, MODE_PRIVATE);
            SharedPreferences.Editor editInt = shareInt.edit();

            //Save the value of points from Quiz One with SharedPreferences
            editInt.putInt("quizOnePointsYeah", numberQuizOnePoints);
            editInt.commit();

            //Get the value of points from all other quizzes with getInt from SharedPreferences
            numberQuizTwoPoints = shareInt.getInt("quizTwoPointsYeah", 0);
            numberQuizThreePoints = shareInt.getInt("quizThreePointsYeah", 0);
            numberQuizFourPoints = shareInt.getInt("quizFourPointsYeah", 0);
            numberQuizFivePoints = shareInt.getInt("quizFivePointsYeah", 0);
            numberQuizSixPoints = shareInt.getInt("quizSixPointsYeah", 0);
            numberQuizSevenPoints = shareInt.getInt("quizSevenPointsYeah", 0);
            numberQuizEightPoints = shareInt.getInt("quizEightPointsYeah", 0);
            numberQuizNinePoints = shareInt.getInt("quizNinePointsYeah", 0);
            numberQuizTenPoints = shareInt.getInt("quizTenPointsYeah", 0);

            //Sum up points from each quiz, and put sum in totalPoints variable
            totalPoints = numberQuizOnePoints + numberQuizTwoPoints + numberQuizThreePoints
                    + numberQuizFourPoints + numberQuizFivePoints + numberQuizSixPoints
                    + numberQuizSevenPoints + numberQuizEightPoints + numberQuizNinePoints
                    + numberQuizTenPoints;


            quizOnePointsText.setText(String.format("%d", numberQuizOnePoints));
            quizTwoPointsText.setText(String.format("%d", numberQuizTwoPoints));
            quizThreePointsText.setText(String.format("%d", numberQuizThreePoints));
            quizFourPointsText.setText(String.format("%d", numberQuizFourPoints));
            quizFivePointsText.setText(String.format("%d", numberQuizFivePoints));
            quizSixPointsText.setText(String.format("%d", numberQuizSixPoints));
            quizSevenPointsText.setText(String.format("%d", numberQuizSevenPoints));
            quizEightPointsText.setText(String.format("%d", numberQuizEightPoints));
            quizNinePointsText.setText(String.format("%d", numberQuizNinePoints));
            quizTenPointsText.setText(String.format("%d", numberQuizTenPoints));
            actualPointsText.setText(String.format("%d", totalPoints));
        }//end if

这是每个测验捆绑的外观，除了为相应测验适当命名的变量和字符串名称之外...我开始认为这可能不是获取传递给int值的最佳方法主要活动来自另一个活动，但我想不出另一种方法...在这种情况下，我试图保存我从测验中获得的numberQuiz＃Points的值，并获得所有其他int变量的点的值，然后将其显示在应用程序的主屏幕上……但这不起作用:(

这是一个测验按钮setOnClickListener背后的代码示例：

//Directs user to Quiz One, first screen
        quizOneButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                //Subtract out any points that user already got for Quiz 1 from total...
                //In case user wants to or has to re-take Quiz 1
                totalPoints = totalPoints - numberQuizOnePoints;

                //Subtract out any points that user already got for Quiz 1 from itself, equal 0
                numberQuizOnePoints -= numberQuizOnePoints;



                //Go to the Quiz One, first screen

                Intent directToQuizOnePartOne = new Intent();
                directToQuizOnePartOne.setClass(getBaseContext(), QuizOnePartOne.class);
                startActivity(directToQuizOnePartOne);
                finish();
            }//end void onClick quizOne
        });//end setOnClickListener quizOne

这是给定测验的最后一个活动的代码：（在这种情况下，测验1的最后一个活动，正在传递的活动指向MainAcvitity：

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class QuizOnePartFour extends AppCompatActivity
{
    //Create variables for button and TextViews

    TextView totalPointsQuizOneTextView;
    Button returnToMainOne;
    int actualPointsAllQuizOne;

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

        Bundle bundleFour = getIntent().getExtras();
        actualPointsAllQuizOne = bundleFour.getInt("CarryOverThreeQuizOne");

        //Assign variables to appropriate buttons and TextViews

        totalPointsQuizOneTextView = (TextView) findViewById(R.id.txtTotalPointsQuizOne);
        returnToMainOne = (Button) findViewById(R.id.btnReturnToMainOne);

        totalPointsQuizOneTextView.setText(String.format("%d", actualPointsAllQuizOne));

        returnToMainOne.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                //Return to main menu screen

                Bundle bundleFive = new Bundle();
                bundleFive.putInt("PointsFromAllQuizOne", actualPointsAllQuizOne);

                Intent directToMainMenuOne = new Intent();
                directToMainMenuOne.setClass(getBaseContext(), MainMenu.class);
                directToMainMenuOne.putExtras(bundleFive);
                startActivity(directToMainMenuOne);
                finish();
            }//end void onClick returnToMainOne
        });//end setOnClickListener returnToMainOne
    }//end void onCreate QuizOnePartFour
}//end class QuizOnePartFour

Answer 1

不要手动调用onStop这些是特殊的方法，您仅在执行一些清理操作时才重写这些方法。

它是活动生命周期方法之一。 您应该将该代码移动到按钮单击事件。