L'application s'est arrêtée de manière inattendue dans Android?

Question

Mon application Android me donne toujours cette erreur ci-dessous. Lorsque j'ai cliqué sur l'icône des applications dans l'émulateur, mon application a malheureusement cessé de fonctionner.

suivant est l'erreur Logcat

01-04 11:20:57.440: E/AndroidRuntime(798): FATAL EXCEPTION: main 
01-04 11:20:57.440: E/AndroidRuntime(798): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.oj2.currrencyconverter/com.oj2.currrencyconverter.MainConverter}: java.lang.NumberFormatException: Invalid int: "" 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.os.Looper.loop(Looper.java:137) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread.main(ActivityThread.java:5039) 
01-04 11:20:57.440: E/AndroidRuntime(798): at java.lang.reflect.Method.invokeNative(Native Method) 
01-04 11:20:57.440: E/AndroidRuntime(798): at java.lang.reflect.Method.invoke(Method.java:511) 
01-04 11:20:57.440: E/AndroidRuntime(798): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
01-04 11:20:57.440: E/AndroidRuntime(798): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
01-04 11:20:57.440: E/AndroidRuntime(798): at dalvik.system.NativeStart.main(Native Method) 
01-04 11:20:57.440: E/AndroidRuntime(798): Caused by: java.lang.NumberFormatException: Invalid int: "" 
01-04 11:20:57.440: E/AndroidRuntime(798): at java.lang.Integer.invalidInt(Integer.java:138) 
01-04 11:20:57.440: E/AndroidRuntime(798): at java.lang.Integer.parseInt(Integer.java:359) 
01-04 11:20:57.440: E/AndroidRuntime(798): at java.lang.Integer.parseInt(Integer.java:332) 
01-04 11:20:57.440: E/AndroidRuntime(798): at com.oj2.currrencyconverter.MainConverter.onCreate(MainConverter.java:28) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.Activity.performCreate(Activity.java:5104) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
01-04 11:20:57.440: E/AndroidRuntime(798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
01-04 11:20:57.440: E/AndroidRuntime(798): ... 11 more 

Voici le code

package com.oj2.currrencyconverter; 

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

public class MainConverter extends Activity { 
    EditText dollars; 
    EditText rupees; 
    RadioButton dTOr; 
    RadioButton rTOd; 
    Button convert; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //set Gui gui_main_converter for class MainConverter 
     setContentView(R.layout.gui_main_converter); 
     //Get the value from edittext in dollars 
     dollars = (EditText)findViewById(R.id.dollaredtxt); 
     // 
     String rup = dollars.getText().toString(); 
     int convertrup = Integer.parseInt(rup); 
     rupees = (EditText)findViewById(R.id.edtrup); 
     dTOr = (RadioButton) findViewById(R.id.radioDtoR); 
     dTOr.setChecked(true); 
     rTOd = (RadioButton) findViewById(R.id.radioRtoD); 
     convert = (Button) findViewById(R.id.btnConvert); 
     convert.setOnClickListener(mylistner); 
    } 
    private OnClickListener mylistner = new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      if (dTOr.isChecked()) { 
       ConvertDollarToRup(); 
      } 
      if (rTOd.isChecked()) { 
       ConvertRupToDollar(); 
      } 
     } 
    }; 
    public void ConvertDollarToRup() { 
     // TODO Auto-generated method stub 
     double val = Double.parseDouble(dollars.getText().toString()); 
     rupees.setText(Double.toString(val*56)); 
    } 
    public void ConvertRupToDollar() { 
     // TODO Auto-generated method stub 
     double val = Double.parseDouble(rupees.getText().toString()); 
     dollars.setText(Double.toString(val/56)); 

    } 

} 

Remerciant Vous

Answer 1

Changer vos méthodes comme celui-ci,

public void ConvertDollarToRup() { 
    if(!dollars.getText().toString().equals("")) 
    { 
    double val = Double.parseDouble(dollars.getText().toString()); 
    rupees.setText(Double.toString(val*56)); 
    } 
} 

    public void ConvertRupToDollar() { 
    if(!rupees.getText().toString().equals("")) 
    { 
    double val = Double.parseDouble(rupees.getText().toString()); 
    dollars.setText(Double.toString(val/56)); 
    } 
} 

Answer 2

Vous essayez de convertir une chaîne qui n'a pas de contenu:

dollars = (EditText)findViewById(R.id.dollaredtxt); 
String rup = dollars.getText().toString(); 
int convertrup = Integer.parseInt(rup); 

rup est ceci: « »
Si votre EditText ne contient pas une valeur initally la chaîne sera toujours vide, vous devez faire l'analyse dans la méthode onClick et pas dans la méthode onCreate