android中的numberformatexception和edittext

Question

Following code gives me numberformatexception. can you please tell me where to put exepcions or what to do about following lines? logcat tells that there is a problem on commented line

public void zaplatiti(){
   EditText zbrojka = (EditText) findViewById(R.id.editText7);
   Float[] strings = new Float[allTexts.size()];
   Float zbroj=(float) 0;
   for(int i=0; i < allTexts.size(); i++){
       strings[i] = Float.valueOf(allTexts.get(i).getText().toString());////problem


   }
   for (int k=0;k<strings.length;k++){
       zbroj =zbroj+ strings[k];}

   }
   zbrojka.setText(String.valueOf(zbroj)+"KN");

}

Answer 1

for(int i=0; i < allTexts.size(); i++){
    try {
        strings[i] = Float.valueOf(allTexts.get(i).getText().toString());////problem
    }
    catch (NumberFormatException e) {
        // Code to execute if the entered value is not a number
    }
}

This is also possible to avoid by only allowing your EditTexts to have numerical values. That will force the user to only enter a numerical value in the first place, then you don't have to catch the exception. But then you should check if the entered text is empty first.

EDIT:

For doing this you must make an if statement, but the correct comparison beetween String values is:

if ( mEditText.getText().toString().equals("String to compare with")){ ... } 

the "numerical mode" of an editText could be set up in the XML file as:

android:inputType = "number"

Other valid numerical modes are numberSigned and numberDecimal .

So after changing the input type your code could look like:

for(int i=0; i < allTexts.size(); i++){
    if (!allTexts.get(i).getText().toString().equals("")) {
        strings[i] = Float.valueOf(allTexts.get(i).getText().toString());////problem
    }
    else {
        // Code to execute if there is no entered value
    }
}

Answer 2

您是否检查过allTexts数组类型？