Android编码错误

我是android/java编程的初学者。我下面的程序崩溃了

currkm=Double.parseDoublecurrentkm.getText.toString；。我试图解决这个问题，但没能解决。我相信这是安卓系统的一个基本编码错误。 提供解决此问题的建议

package com.example.my2app;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {

    double vehiclemileage;
    TextView mileage;
    SharedPreferences somedata;
    SharedPreferences.Editor editor;
    TextView previouskm;
    EditText currentkm;
    EditText petrollitrs;
    double currkm;
    double prevkm;
    double petrollt;
    Button resultbtn;
    String previouskmstr;
    String prevkmstring;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
                setContentView(R.layout.mileagecalc);
                somedata= this.getBaseContext().getSharedPreferences("sakthivel",0);
                editor = somedata.edit();

                previouskm = (TextView)findViewById(R.id.previouskm);
                currentkm = (EditText)findViewById(R.id.currentkm);
                petrollitrs = (EditText)findViewById(R.id.petroLtr);
                mileage = (TextView)findViewById(R.id.mileage);

                previouskmstr = somedata.getString("previousmileage", null);
                previouskm.setText(previouskmstr);

                resultbtn = (Button)findViewById(R.id.button1);

                resultbtn.setOnClickListener(new View.OnClickListener() {

                    public void onClick(View arg0) {

                          // TODO Auto-generated method stub
                          try{
                          currkm = (Double.parseDouble(currentkm.getText().toString()));
                          prevkm = (Double.parseDouble(previouskm.getText().toString()));
                          petrollt = (Double.parseDouble(petrollitrs.getText().toString()));
                          vehiclemileage = (currkm-prevkm)/petrollt;
                          prevkmstring = currentkm.getText().toString();
                          mileage.setText("your vehicle mileage is " + vehiclemileage);
                          editor.putString("previousmileage", prevkmstring);
                          editor.commit();
                          previouskm.setText(prevkmstring);
                          }
                          catch(NumberFormatException e){
                              e.printStackTrace();

                          }

                    }
                });
            }
}

日志类别：

11-13 12:52:27.671: E/JavaBinder(661): *** Uncaught remote exception!  (Exceptions are not yet supported across processes.)
11-13 12:52:27.671: E/JavaBinder(661): java.lang.RuntimeException: android.os.DeadObjectException
11-13 12:52:27.671: E/JavaBinder(661):  at android.os.Parcel.writeException(Parcel.java:1332)
11-13 12:52:27.671: E/JavaBinder(661):  at android.os.Binder.execTransact(Binder.java:391)

一些可能性：

我假设您已将输入类型设置为仅数字，如果没有，请尝试

edit.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL | InputType.TYPE_NUMBER_FLAG_SIGNED);

或者从XML中，您可以在EditText中添加android:inputType=number | decimal

它将抛出java.lang.NumberFormatException:这将表明应用程序试图将字符串转换为一种数值类型，但该字符串没有适当的格式

所以，如果您正在尝试，就不能解析或强制转换字符串为double。否则，您的代码在语法上是正常的

---

如果您正处于强制关闭状态，请在{}内编写代码，并尝试{}&catchexception e{}。这将忽略您的错误，并且不会关闭您的应用程序。

您可以发布您的logcat错误消息和mileagecalc.xml布局文件吗。currkm edittext中有什么文本？您好，已将输入类型定义为inputDecimal。但我还是得到了这个问题。粘贴在您获得的日志下方&这是由于您的首选代码。尝试