Java Android Studio测验应用程序，带分数

我目前正在Android Studio中制作一个旗子测验应用程序，我想添加一个功能，每个正确答案给你1分，错误答案给你0分。（按下提示按钮或跳过按钮也会显示0）。最后，您可以按一个名为“获取我的分数”的按钮，在这里给出最终分数

我的问题是，即使我提交了正确的答案，我的分数是0，而当我提交了错误的答案，有时我的分数是正的。。。也就是说，有点不对劲。我是否遗漏了一些代码，或者我只是用了错误的方法

更新

成功了！下面是正确的代码

首先，这是一个主要的活动，包含所有片段（标志）的代码：

Play.java

public class Play extends MainActivity {

private int total = 0;

public void updateScore(int add){
    total += add;
}

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

    final String myScore = String.valueOf(total);

    final ImageButton imageBtn10 = (ImageButton) findViewById(R.id.imageButton10);
    final ImageButton imageBtn9 = (ImageButton) findViewById(R.id.imageButton9);
    final ImageButton imageBtn8 = (ImageButton) findViewById(R.id.imageButton8);
    final ImageButton imageBtn7 = (ImageButton) findViewById(R.id.imageButton7);
    final ImageButton imageBtn6 = (ImageButton) findViewById(R.id.imageButton6);
    final ImageButton imageBtn5 = (ImageButton) findViewById(R.id.imageButton5);
    final ImageButton imageBtn4 = (ImageButton) findViewById(R.id.imageButton4);
    final ImageButton imageBtn3 = (ImageButton) findViewById(R.id.imageButton3);

    final Button button_score = (Button)findViewById(R.id.scoreButton);


    FragmentManager fragMan = getFragmentManager();
    FragmentTransaction fragTrans = fragMan.beginTransaction();
    FragmentDefault fd = new FragmentDefault();
    fragTrans.replace(R.id.fragment_place, fd);
    fragTrans.commit();

    fragTrans.hide(new FragmentOne());
    fragTrans.hide(new FragmentTwo());
    fragTrans.hide(new FragmentThree());

    button_score.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle bundle = new Bundle();
            bundle.putString("yes", String.valueOf(total));

            Intent intent= new Intent(Play.this, FinalActivity.class);
            intent.putExtras(bundle);
            startActivity(intent);
        }
    });

    imageBtn10.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentOne());
                fragTrans.commit();
                //imageBtn10.setEnabled(false);
        }

    });


    imageBtn9.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentTwo());
            fragTrans.commit();
        }
    });

    imageBtn8.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentThree());
                fragTrans.commit();
        }
    });

    imageBtn7.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn6.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn5.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn4.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();

        }
    });

    imageBtn3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });
 }
}

public class FragmentOne extends Fragment {

    private EditText userAnswer;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_fragment_one, null);
    userAnswer = (EditText)v.findViewById(R.id.editText);
    final TextView tv = (TextView)v.findViewById(R.id.showCorrect);
    final TextView hintv = (TextView)v.findViewById(R.id.textHint);

    final Button submit = (Button)v.findViewById(R.id.submitBtn1);
    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            String theAnswer = (userAnswer.getText().toString());
            if (theAnswer.equalsIgnoreCase("Germany")) {
                ((Play) getActivity()).updateScore(1);
                tv.setText("Correct!");
            }
            else {
                tv.setText("Wrong");
            }
            submit.setEnabled(false);

            // updateScore();
        }
    });

    final Button skip = (Button)v.findViewById(R.id.skipBtn);
    skip.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            submit.setEnabled(false);
        }
    });

    final Button hint = (Button)v.findViewById(R.id.hintBtn);
    hint.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            hintv.setText("The capital is Berlin \n The country is in Europe \n It starts with G... ");
        }
    });
    return v;}
}

public class FinalActivity extends AppCompatActivity {

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

    Bundle bundle = getIntent().getExtras();
    final String yes_sir = bundle.getString("yes"); //yes_sir has to be the total score added up.

    final TextView tv2 = (TextView)findViewById(R.id.textView5);
    final Button submit = (Button)findViewById(R.id.button4);

    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            tv2.setText("Score is " + yes_sir);
        }
    });
}
}  

第一个标志（片段）的代码：

FragmentOne.java

public class Play extends MainActivity {

private int total = 0;

public void updateScore(int add){
    total += add;
}

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

    final String myScore = String.valueOf(total);

    final ImageButton imageBtn10 = (ImageButton) findViewById(R.id.imageButton10);
    final ImageButton imageBtn9 = (ImageButton) findViewById(R.id.imageButton9);
    final ImageButton imageBtn8 = (ImageButton) findViewById(R.id.imageButton8);
    final ImageButton imageBtn7 = (ImageButton) findViewById(R.id.imageButton7);
    final ImageButton imageBtn6 = (ImageButton) findViewById(R.id.imageButton6);
    final ImageButton imageBtn5 = (ImageButton) findViewById(R.id.imageButton5);
    final ImageButton imageBtn4 = (ImageButton) findViewById(R.id.imageButton4);
    final ImageButton imageBtn3 = (ImageButton) findViewById(R.id.imageButton3);

    final Button button_score = (Button)findViewById(R.id.scoreButton);


    FragmentManager fragMan = getFragmentManager();
    FragmentTransaction fragTrans = fragMan.beginTransaction();
    FragmentDefault fd = new FragmentDefault();
    fragTrans.replace(R.id.fragment_place, fd);
    fragTrans.commit();

    fragTrans.hide(new FragmentOne());
    fragTrans.hide(new FragmentTwo());
    fragTrans.hide(new FragmentThree());

    button_score.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle bundle = new Bundle();
            bundle.putString("yes", String.valueOf(total));

            Intent intent= new Intent(Play.this, FinalActivity.class);
            intent.putExtras(bundle);
            startActivity(intent);
        }
    });

    imageBtn10.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentOne());
                fragTrans.commit();
                //imageBtn10.setEnabled(false);
        }

    });


    imageBtn9.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentTwo());
            fragTrans.commit();
        }
    });

    imageBtn8.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentThree());
                fragTrans.commit();
        }
    });

    imageBtn7.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn6.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn5.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn4.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();

        }
    });

    imageBtn3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });
 }
}

public class FragmentOne extends Fragment {

    private EditText userAnswer;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_fragment_one, null);
    userAnswer = (EditText)v.findViewById(R.id.editText);
    final TextView tv = (TextView)v.findViewById(R.id.showCorrect);
    final TextView hintv = (TextView)v.findViewById(R.id.textHint);

    final Button submit = (Button)v.findViewById(R.id.submitBtn1);
    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            String theAnswer = (userAnswer.getText().toString());
            if (theAnswer.equalsIgnoreCase("Germany")) {
                ((Play) getActivity()).updateScore(1);
                tv.setText("Correct!");
            }
            else {
                tv.setText("Wrong");
            }
            submit.setEnabled(false);

            // updateScore();
        }
    });

    final Button skip = (Button)v.findViewById(R.id.skipBtn);
    skip.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            submit.setEnabled(false);
        }
    });

    final Button hint = (Button)v.findViewById(R.id.hintBtn);
    hint.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            hintv.setText("The capital is Berlin \n The country is in Europe \n It starts with G... ");
        }
    });
    return v;}
}

public class FinalActivity extends AppCompatActivity {

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

    Bundle bundle = getIntent().getExtras();
    final String yes_sir = bundle.getString("yes"); //yes_sir has to be the total score added up.

    final TextView tv2 = (TextView)findViewById(R.id.textView5);
    final Button submit = (Button)findViewById(R.id.button4);

    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            tv2.setText("Score is " + yes_sir);
        }
    });
}
}  

这是其中一个问题的代码。所以你可以点击国旗，写下它属于哪个国家。每个标志都是一个片段

由于这一行，我在上面的代码中得到一个错误： （（Play）getActivity（））.updateStore（1）； 游戏颜色为红色，上面写着“无法解析符号”“游戏”

这是您按下“获取我的分数”按钮时的代码：

最终性。java

public class Play extends MainActivity {

private int total = 0;

public void updateScore(int add){
    total += add;
}

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

    final String myScore = String.valueOf(total);

    final ImageButton imageBtn10 = (ImageButton) findViewById(R.id.imageButton10);
    final ImageButton imageBtn9 = (ImageButton) findViewById(R.id.imageButton9);
    final ImageButton imageBtn8 = (ImageButton) findViewById(R.id.imageButton8);
    final ImageButton imageBtn7 = (ImageButton) findViewById(R.id.imageButton7);
    final ImageButton imageBtn6 = (ImageButton) findViewById(R.id.imageButton6);
    final ImageButton imageBtn5 = (ImageButton) findViewById(R.id.imageButton5);
    final ImageButton imageBtn4 = (ImageButton) findViewById(R.id.imageButton4);
    final ImageButton imageBtn3 = (ImageButton) findViewById(R.id.imageButton3);

    final Button button_score = (Button)findViewById(R.id.scoreButton);


    FragmentManager fragMan = getFragmentManager();
    FragmentTransaction fragTrans = fragMan.beginTransaction();
    FragmentDefault fd = new FragmentDefault();
    fragTrans.replace(R.id.fragment_place, fd);
    fragTrans.commit();

    fragTrans.hide(new FragmentOne());
    fragTrans.hide(new FragmentTwo());
    fragTrans.hide(new FragmentThree());

    button_score.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle bundle = new Bundle();
            bundle.putString("yes", String.valueOf(total));

            Intent intent= new Intent(Play.this, FinalActivity.class);
            intent.putExtras(bundle);
            startActivity(intent);
        }
    });

    imageBtn10.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentOne());
                fragTrans.commit();
                //imageBtn10.setEnabled(false);
        }

    });


    imageBtn9.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentTwo());
            fragTrans.commit();
        }
    });

    imageBtn8.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
                FragmentManager fragMan = getFragmentManager();
                FragmentTransaction fragTrans = fragMan.beginTransaction();
                fragTrans.replace(R.id.fragment_place, new FragmentThree());
                fragTrans.commit();
        }
    });

    imageBtn7.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn6.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn5.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });

    imageBtn4.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();

        }
    });

    imageBtn3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fragMan = getFragmentManager();
            FragmentTransaction fragTrans = fragMan.beginTransaction();
            fragTrans.replace(R.id.fragment_place, new FragmentThree());
            fragTrans.commit();
        }
    });
 }
}

public class FragmentOne extends Fragment {

    private EditText userAnswer;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_fragment_one, null);
    userAnswer = (EditText)v.findViewById(R.id.editText);
    final TextView tv = (TextView)v.findViewById(R.id.showCorrect);
    final TextView hintv = (TextView)v.findViewById(R.id.textHint);

    final Button submit = (Button)v.findViewById(R.id.submitBtn1);
    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            String theAnswer = (userAnswer.getText().toString());
            if (theAnswer.equalsIgnoreCase("Germany")) {
                ((Play) getActivity()).updateScore(1);
                tv.setText("Correct!");
            }
            else {
                tv.setText("Wrong");
            }
            submit.setEnabled(false);

            // updateScore();
        }
    });

    final Button skip = (Button)v.findViewById(R.id.skipBtn);
    skip.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            submit.setEnabled(false);
        }
    });

    final Button hint = (Button)v.findViewById(R.id.hintBtn);
    hint.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            hintv.setText("The capital is Berlin \n The country is in Europe \n It starts with G... ");
        }
    });
    return v;}
}

public class FinalActivity extends AppCompatActivity {

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

    Bundle bundle = getIntent().getExtras();
    final String yes_sir = bundle.getString("yes"); //yes_sir has to be the total score added up.

    final TextView tv2 = (TextView)findViewById(R.id.textView5);
    final Button submit = (Button)findViewById(R.id.button4);

    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            tv2.setText("Score is " + yes_sir);
        }
    });
}
}  

---

我是一个完全的编程初学者，所以一个详细的解释将是最有帮助的

您可以使用“是”键从捆绑包中获得分数：

我猜你的分数应该是“a”，因为当答案正确时，你的分数会增加。您没有向我们显示代码，您在何处将视图更改为“分数”视图（创建新活动），以及在何处将分数添加到捆绑包中。您应该将分数添加到片段类中的bundle中，如下所示：

bundle.putString("yes", String.valueOf(a));

Intent intent= new Intent(this, FinalActivity.class);
intent.putExtras(bundle);
startActivity(intent);

您可以使用Android捆绑包为新活动提供数据。要做到这一点，您可以将数据放入一个捆绑包中，并将其交给新活动的onCreate。在那里，您可以取回数据。您的问题是，您试图从捆绑包中获取数据，但从未向捆绑包中添加数据

为了帮助您更详细地了解情况，您可以查看代码，在其中创建显示分数的活动

您需要使用Intent将该捆绑包提供给您的新活动

当你想开始你的期末考试时，你应该这样做：

bundle.putString("yes", String.valueOf(a));

Intent intent= new Intent(this, FinalActivity.class);
intent.putExtras(bundle);
startActivity(intent);

要在片段及其活动之间进行通信，最简单（但不是最好）的方法如下：

（（Play）getActivity（））.updateStore（1）

在片段中执行此操作，而不是在公共静态int中执行。因此，您可以编写上面的行，而不是“a++；”

在Play类中，您必须添加以下功能：

public void updateScore(int add){
    total += add;
}

您应该更改：

 final int total = (0 + FragmentOne.a + FragmentTwo.b);

致： 私有整数总计=0

并将其从onCreate（）函数移动到类中

而不是：

bundle.putString("yes", myScore);

您现在可以执行以下操作：

bundle.putString("yes", String.valueOf(total));

---

注意：您的问题出现了，因为您的分数在创建播放活动时初始化了一次。这意味着，当您第一次初始化它时，总数将设置为0。当您现在正确回答一个问题时，总计将不会被更新，因为它仅设置为初始化活动。当你按下记分按钮时，它仍然是0。现在切换回游戏活动时，总数再次初始化并变为1（如果您之前正确回答）。

因此我更改了代码，您可以在下面看到新代码。虽然，程序不能运行…是的，你想了解我。请更新您的问题，并添加答案。这不是这样的工作方式。我更新了我的答案。显示分数的活动是我上面提供的FinalActivity.java。我知道。但是你是怎么开始的呢？让我们来。