java - 找不到哪里出错了

Question

我是 Java 和 Android 新手，我想制作一个 Android 程序，让用户输入标签价格并单击“获取最终价格”按钮，该程序就能够显示最终价格。 (税后8%)我无法发布图片，因为我刚刚注册并且信誉度为0。所以我复制下面的代码。没有红线，但它就是不会运行。请帮我。我非常感谢大家的回答。谢谢!!

来自 TaxCalculator.java 的代码:

package com.finalproject.taxcalculator;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.widget.TextView;

public class TaxCalculator extends Activity
{
private EditText text;

private EditText tagPriceEditText;
private EditText totalPriceEditText;

private TextView tagPriceTextView;
private TextView totalPriceTextView;

/** Called when the activity is first created. */
@Override
public void onCreate(final Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tagPriceEditText = (EditText)findViewById(R.id.tagPriceEditText);
    tagPriceEditText = (EditText)findViewById(R.id.totalPriceEditText);

    tagPriceTextView = (TextView)findViewById(R.id.tagPriceTextView);
    totalPriceTextView = (TextView)findViewById(R.id.totalPriceTextView);

    final Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v){
            //Perform action here
            //Ignore. Haven't done yet.
            double tagPrice = Double.parseDouble(tagPriceEditText.getText().toString());
            double totalPrice = tagPrice * 1.08;

            totalPriceEditText.setText(String.format("%.02f", totalPrice));

        }
    });

}

}

非常感谢!!

Answer 1

问题可能出在以下几行:

tagPriceEditText = (EditText)findViewById(R.id.tagPriceEditText);
tagPriceEditText = (EditText)findViewById(R.id.totalPriceEditText); //your reassigned tagPriceEditText  here

更改为

    tagPriceEditText = (EditText)findViewById(R.id.tagPriceEditText);
    totalPriceEditText = (EditText)findViewById(R.id.totalPriceEditText);