java - 我的 Android 复利计算器一直崩溃

Question

package dum.de.dum;

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

正常导入？

public class CalcActivity extends Activity {


    Button finish;
    double total;
    double interest2;
    double time2;
    double base2;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {




        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        finish = (Button) findViewById(R.id.total);
        finish.setOnClickListener(new OnClickListener(){
            public void onClick(View V) {

                EditText base;
                base = (EditText) findViewById(R.id.base);
                String baseValue = base.getText().toString();
                double BaseNum = Double.parseDouble(baseValue);

                EditText interest;
                interest = (EditText) findViewById(R.id.interest);
                String interestValue = interest.getText().toString();
                double interestNum = Double.parseDouble(interestValue);

                EditText time;
                time = (EditText) findViewById(R.id.time);
                String timeValue = time.getText().toString();
                double timeNum = Double.parseDouble(timeValue);

                double total = BaseNum * Math.pow(interestNum + 1, timeNum);        

我听说人们在解析数字时遇到问题，所以我不确定这是否是个问题，如果是我也不知道如何解决

        EditText Output;
        Output = (EditText) findViewById(R.id.total);
        Output.setText("Your total is: " + total);

        };

    });
}
}

每次我尝试在模拟器中运行它时，我都会立即强制关闭。我是一名新手程序员，我在 eclipse 中没有收到任何错误代码。

Answer 1

finish = (Button) findViewById(R.id.total);

finish 按钮的 id 不是 R.id.total - 根据这个，这是一个 EditText...

Output = (EditText) findViewById(R.id.total);

尝试使用该 ID 查找按钮时，您将收到 ClassCastException。