Why is this line of code giving me an error? [closed] - android

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I am trying to loop through a vectors elements and trying to find out if a position in the vector is equal to null...
if(_vecForShapes.get(i)!=null)//this line works fine but when it gets to a position where it is null it gives me an error? Any ideas?
{
}
Thanks!


Are you sure that it is get(i) that is null, and not that you have exceeded the number of items in _vecForShapes? It is much more likely that the _vecForShapes.get(i) is throwing an error than the comparison to null.
What type does get(i) return?

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How do I handle this [closed]

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Error on my flutter code regarding a dropdown
Exception has occurred.
_CastError (type 'List' is not a subtype of type 'String?' in type cast)

You are trying to cast list to a string thats why you get _CastError, when you use "[]" in dart, you actually declare a list, so either you need to change type String? selectedPlan to List<String>? selectedPlan or just remove the brackets like String? selectedPlan = 'FIXED DEPOSIT SAVINGS';
And please share code as code next time :)

Why I am not getting the correct output for array.set? [closed]

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
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Firstly, I am storing the data in ArrayList.Now based on my index(current position) I want to replace that data with new data,but what I am getting is
old data,old data,old data,true,true,new data,new data....
Any suggestions
ArrayList<String> arr = new ArrayList<String>();
if (arr.isEmpty()) {
for(int i = 0;i<=mcq.size();i++) {
arr.add(s);
}
} else {
arr.set(currentPosition, String.valueOf(arr.add(s)));
}
"s" is a String value I am getting from somewhere else.

This looks really weird:
arr.set(currentPosition, String.valueOf(arr.add(s)));
ArrayList.set changes the elements stored at currentPosition. You want it to change it to the string value of what arr.add returns.
ArrayList.add returns a boolean, so there you get your true values from.
I think you want to do arr.set(currentPosition, s);

NumberFormatException: Invalid float [closed]

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My error is :
weight = Float.parseFloat(etWeightBMI.getText().toString()); error is (1228): java.lang.NumberFormatException: Invalid float: ""

Before Parsing you should check
if(TextUtils.isEmpty(etWeightBMI.getText().toString()))
{
//do your job
}

etWeightBMI.getText().toString(); returns blank. Thats why you get the NPE.

This line returns null.
etWeightBMI.getText().toString();
Do this with validation like below:
if(etWeightBMI.getText().toString().trim().length()>0){
weight = Float.parseFloat(etWeightBMI.getText().toString());
}

HttpResponse & string android [closed]

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I wrote a code..There I want to validate something.In my code contain "HttpResponse response;" variable.I want to write,
if(response>="0"){
//do somthing
}
but can't above thing. bcs response is not string...How to do that?

EntityUtils is static helpers for dealing with entities.
http://www.developer.android.com/reference/org/apache/http/util/EntityUtils.html‎
String result = EntityUtils.toString(response);
if(result >="0"){
//do somthing
}

response.toString()
try that, you should also look at writing your questions more formally.

How to get the answers in String Array (ie) Vector? [closed]

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This is my code:
blanks=new EditText(this);
String values =blanks.getText().toString();
answers.put(relative.getId(),answer);
if(answer[0].equals(values)) {
Toast.makeText(this,"Match!", Toast.LENGTH_LONG).show();
}

Your code makes no sense. You crate a new EditText field, and then immediately get the text. But this will always be null.

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