朋友我搜索了很多,但没有得到我的问题的答案。我正在尝试制作一个android计算器。一个简单的,其实它只是我的更大的应用程序的单个模块...在android中面对计算器的应用程序错误
在这首先,我需要用户输入第一和第二个sunber,并选择他是否想添加,分,多,分或获得mod ..然后有一个文本视图在其中显示结果。
这是我使用的代码:
Java代码:
package com.droidacid.apticalc;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class numSys extends Activity{
EditText etnumber1;
EditText etnumber2;
Button badd;
Button bsub;
Button bmul;
Button bdiv;
Button bmod;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.numsys);
etnumber1 = (EditText) findViewById(R.id.number1);
etnumber2 = (EditText) findViewById(R.id.number2);
String number1 = etnumber1.getText().toString();
String number2 = etnumber2.getText().toString();
final Double number1D = Double.parseDouble(number1);
final Double number2D = Double.parseDouble(number2);
badd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
double resultD = number1D + number2D;
String result = "result :"+resultD;
TextView tvresult = (TextView) findViewById(R.id.tvresult);
tvresult.setText(result);
}
});
bsub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
double resultD = number1D - number2D;
String result = "result :"+resultD;
TextView tvresult = (TextView) findViewById(R.id.tvresult);
tvresult.setText(result);
}
});
bmul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
double resultD = number1D * number2D;
String result = "result :"+resultD;
TextView tvresult = (TextView) findViewById(R.id.tvresult);
tvresult.setText(result);
}
});
bdiv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
double resultD = number1D/number2D;
String result = "result :"+resultD;
TextView tvresult = (TextView) findViewById(R.id.tvresult);
tvresult.setText(result);
}
});
bmod.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
double resultD = number1D % number2D;
String result = "result :"+resultD;
TextView tvresult = (TextView) findViewById(R.id.tvresult);
tvresult.setText(result);
}
});
}
}
这是logcat的错误:
05-04 10:24:18.098: E/AndroidRuntime(1321): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.droidacid.apticalc/com.droidacid.apticalc.numSys}: java.lang.NumberFormatException:
请不要评价此职位为阴性。我只是试图学习并试图解决这个问题,因为这超过了24小时。尝试了一切张贴在堆栈溢出。
由于
检查字符串是否可以解析为double(空格,字符不能被解析) – 2013-05-08 13:36:38