Question

我想在点击按钮时显示在toast msg的帮助下计算的总数，但每次点击它我得到0.0可以帮助我解决这个问题吗？

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        String s, s1, s2, s3, s4, s5, s6;
        String result;
        final String disp;
        int a, a1, a2, a3, a4, a5, a6;
        double total = 0;
        double price;

        Button button = (Button) findViewById(R.id.button);

        CheckBox opt = (CheckBox) findViewById(R.id.opt);
        CheckBox opt1 = (CheckBox) findViewById(R.id.opt1);
        CheckBox opt2 = (CheckBox) findViewById(R.id.opt2);
        CheckBox opt3 = (CheckBox) findViewById(R.id.opt3);
        CheckBox opt4 = (CheckBox) findViewById(R.id.opt4);
        CheckBox opt5 = (CheckBox) findViewById(R.id.opt5);
        CheckBox opt6 = (CheckBox) findViewById(R.id.opt6);

        EditText oid = (EditText) findViewById(R.id.oid);
        EditText oid1 = (EditText) findViewById(R.id.oid1);
        EditText oid2 = (EditText) findViewById(R.id.oid2);
        EditText oid3 = (EditText) findViewById(R.id.oid3);
        EditText oid4 = (EditText) findViewById(R.id.oid4);
        EditText oid5 = (EditText) findViewById(R.id.oid5);
        EditText oid6 = (EditText) findViewById(R.id.oid6);


        if (opt.isChecked()) {
            price = 13.0;
            s = opt.getText().toString();
            a = Integer.parseInt(oid1.getText().toString());
            total += (price * a);
        }
        if (opt1.isChecked()) {
            price = 13.0;
            s1 = opt1.getText().toString();
            a1 = Integer.parseInt(oid2.getText().toString());
            total += (price * a1);
        }
        if (opt2.isChecked()) {
            price = 13.0;
            s2 = opt2.getText().toString();
            a2 = Integer.parseInt(oid3.getText().toString());
            total += (price * a2);
        }
        if (opt3.isChecked()) {
            price = 13.0;
            s3 = opt3.getText().toString();
            a3 = Integer.parseInt(oid4.getText().toString());
            total += (price * a3);
        }
        if (opt4.isChecked()) {
            price = 13.0;
            s4 = opt4.getText().toString();
            a4 = Integer.parseInt(oid5.getText().toString());
            total += (price * a4);
        }
        if (opt5.isChecked()) {
            price = 13.0;
            s5 = opt5.getText().toString();
            a5 = Integer.parseInt(oid5.getText().toString());
            total += (price * a5);
        }
        if (opt6.isChecked()) {
            price = 13.0;
            s6 = opt6.getText().toString();
            a6 = Integer.parseInt(oid6.getText().toString());
            total += (price * a6);
        }

        result = String.valueOf(total);
        disp=result;

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toastMsg(disp);
            }
        });
    }
        public void toastMsg(String result) {

            Toast toast = Toast.makeText(this, result, Toast.LENGTH_LONG);
            toast.show();

        }
    }

我尝试删除final关键字，因为这可能会阻止我将值更新为字符串但没有成功。我很困惑如何继续。

Answer 1

在log cat中打印结果变量并查看它是否包含任何值...我认为您的结果变量不包含任何值。你可以显示吐司而不将双重转换为字符串.. 如

public static void changeTabsAttributes(TabLayout tabLayout, int textSize) {

    ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0);
    int tabsCount = vg.getChildCount();
    for (int j = 0; j < tabsCount; j++) {
        ViewGroup vgTab = (ViewGroup) vg.getChildAt(j);
        int tabChildsCount = vgTab.getChildCount();
        for (int i = 0; i < tabChildsCount; i++) {
            View tabViewChild = vgTab.getChildAt(i);
            if (tabViewChild instanceof TextView) {
                //set the background somewhere here?
                ((TextView) tabViewChild).setTextSize(textSize);
            }
        }
    }
}

尝试这样做..将您的计算代码粘贴到按钮单击

  Toast toast = Toast.makeText(this, total+"", Toast.LENGTH_LONG);
            toast.show();

Answer 2

private void calcResult()
   {
        String disp;
        if (opt.isChecked()) {
            price = 13.0;
            s = opt.getText().toString();
            a = Integer.parseInt(oid1.getText().toString());
            total += (price * a);
        }
        if (opt1.isChecked()) {
            price = 13.0;
            s1 = opt1.getText().toString();
            a1 = Integer.parseInt(oid2.getText().toString());
            total += (price * a1);
        }
        if (opt2.isChecked()) {
            price = 13.0;
            s2 = opt2.getText().toString();
            a2 = Integer.parseInt(oid3.getText().toString());
            total += (price * a2);
        }
        if (opt3.isChecked()) {
            price = 13.0;
            s3 = opt3.getText().toString();
            a3 = Integer.parseInt(oid4.getText().toString());
            total += (price * a3);
        }
        if (opt4.isChecked()) {
            price = 13.0;
            s4 = opt4.getText().toString();
            a4 = Integer.parseInt(oid5.getText().toString());
            total += (price * a4);
        }
        if (opt5.isChecked()) {
            price = 13.0;
            s5 = opt5.getText().toString();
            a5 = Integer.parseInt(oid5.getText().toString());
            total += (price * a5);
        }
        if (opt6.isChecked()) {
            price = 13.0;
            s6 = opt6.getText().toString();
            a6 = Integer.parseInt(oid6.getText().toString());
            total += (price * a6);
        }

        result = String.valueOf(total);
        disp=result;
        toastMsg(disp);

}

创建一个我的答案中写的方法，其中包含计算代码，然后在按钮点击事件中调用该方法，如下所示，

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                calcResult()
            }
        });

并且不要使disp最终使它成为calcResult方法的局部变量。

Answer 3

我尝试在我的方法中添加所有计算，然后在按下按钮时调用它，当我运行应用程序时崩溃

想要在双击类型的点击按钮上显示吐司的帮助

3 个答案: