小编use*_*727的帖子

我的问题是,当我在Android模拟器上运行我的应用程序时,应用程序启动但很快崩溃并显示弹出窗口:"不幸的是,TipCalculator已停止." 我查看了代码并彻底搜索了互联网以获得答案.是的我是android开发的新手.我查看了LogCat生成的错误,但不知道问题以及根据收到的错误在哪里找到它.

这是我的代码:

TipCalc.java

package com.troysantry.tipcalculator;

import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.widget.EditText;

public class TipCalc extends Activity {

    public static final String TOTAL_BILL = "TOTAL_BILL";
    public static final String CURRENT_TIP = "CURRENT_TIP";
    public static final String BILL_WITHOUT_TIP = "BILL_WITHOUT_TIP";

    public double billBeforeTip;
    public double tipAmount;
    public double finalBill;

    EditText txtBillBeforeTip;
    EditText txtTipAmount;
    EditText txtFinalBill;

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

        if(savedInstanceState==null){

            billBeforeTip=0.0;
            tipAmount=0.15;
            finalBill=0.0;
        }
        else{

            billBeforeTip=savedInstanceState.getDouble(BILL_WITHOUT_TIP);
            tipAmount=savedInstanceState.getDouble(CURRENT_TIP);
            finalBill=savedInstanceState.getDouble(TOTAL_BILL);

        }
            txtBillBeforeTip = …