如何跟踪 Android 应用程序中的变量？

Question

当用户进入应用程序时，他选择了球队1（巴西）或球队2（阿根廷），然后他选择了黄牌或红牌，然后他选择了一名球员，然后在第一页中会显示球员号码和卡片颜色。

在此处输入图像描述

我的问题是如何跟踪号码卡片数量，而不是显示玩家编号，而是显示球队有多少张黄牌或红牌。

CardActivity

public class CardActivity extends AppCompatActivity {

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

private void setCardData(int card) {
    SharedPreferences settings getApplicationContext().getSharedPreferences("MainThisApp", 0);
    SharedPreferences.Editor editor = settings.edit();
    editor.putInt("card", card);
    editor.apply();

    Intent intent = new Intent(this, Myapp.game.NumberActivity.class);
    startActivity(intent);
}

public void setRedCard(View view) {

    ((Variable) this.getApplication()).setSomeVariable("card_yellow");

    setCardData(0);
}

public void setYellowCard(View view) {

    ((Variable) this.getApplication()).setSomeVariable("card_red");

    setCardData(1);
}}

MainActivity

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    SharedPreferences prefs = getApplicationContext().getSharedPreferences("MainThisApp", 0);
    int check = prefs.getInt("check", 0);

    String s = ((Variable) this.getApplication()).getSomeVariable();
    try{
        Integer number = Integer.valueOf(s);
        System.out.println(number);
    }
    catch (NumberFormatException ex){
        ex.printStackTrace();
    }

    if (check == 50) {
        TextView view = null;
        int country = prefs.getInt("country", -1);
        int card = prefs.getInt("card", -1);

        if (country == 0 & card == 0) {

            view = findViewById(R.id.textView4);
        }
        if (country == 0 & card == 1) {

            view = findViewById(R.id.textView3);
        }
        if (country == 1 & card == 0) {

            view = findViewById(R.id.textView2);

        }
        if (country == 1 & card == 1) {

            view = findViewById(R.id.textView);
        }
        view.setText(String.valueOf(prefs.getInt("number",1)));
    }

}

public void chooseBrasil(View view) {
    setCountryData(0);
}

private void setCountryData(int country) {
    SharedPreferences settings = getApplicationContext().getSharedPreferences("MainThisApp", 0);
    SharedPreferences.Editor editor = settings.edit();
    editor.putInt("country", country);
    editor.apply();
    Intent intent = new Intent(this, CardActivity.class);
    startActivity(intent);
}
public void chooseArgentine(View view) {
    setCountryData(1);
}

NumberActivity< /强>

public class NumberActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_number);
    }

private void setNumberData(int number) {
    SharedPreferences settings = getApplicationContext().getSharedPreferences("MainThisApp", 0);
    SharedPreferences.Editor editor = settings.edit();
    editor.putInt("number", number);
    editor.putInt("check", 50);
    editor.apply();
    Intent intent = new Intent(this, MainActivity.class);
    startActivity(intent);
}

public void setNumber1(View view) {
    setNumberData(1);
}

public void setNumber2(View view) {
    setNumberData(2);
}

public void setNumber3(View view) {
    setNumberData(3);
}

public void setNumber4(View view) {
    setNumberData(4);
}

public void setNumber5(View view) {
    setNumberData(5);
}

public void setNumber6(View view) {
    setNumberData(6);
}

public void setNumber7(View view) {
    setNumberData(7);
}

public void setNumber8(View view) {
    setNumberData(8);
}

Answer 1

您可以使用 ROOM 数据库或 共享首选项。

或者只是使用 kotlin (Singelton) 中的对象来保存可以在任何地方获取和设置的对象中的任何数据