CODEWITHSUNDEEP
javaandroid
Arinton Akos
Arinton Akos

Reputation: 165

How to remove a Linear Layouts child from the 2nd position?

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.unFocus(android.view.View)' on a null object reference.

I want to remove all the views from a Linear Layout, except the first two views. The views that i want to delete were dynamically created. This is what i've tried:

//Edit, i've called it with a wrong layout, but still not working

LinearLayout myFirstLinearLayout = findViewById(R.id.linLay);
deleteLinearLayoutChild(myFirstLinearLayout);

This is the function:

private void deleteLinearLayoutChild(LinearLayout linearView){
        int childNumber = linearView.getChildCount();
        Log.d("childNumb", childNumber+"");
        if (childNumber > 2){
            for (int i=2;i<childNumber;i++){
                linearView.removeViewAt(i);
            }
        }
    }

Upvotes: 0

Views: 422

Answers (3)

IamAjijul
IamAjijul

Reputation: 126

I recommend you to use recycler view or list view to add and remove view in a view group, it will be better practice for you. Several issue may occur in future if you use your methodology , like : 1. Configure change issue 2. Memory leak issue 3. already have child during adding view issue 4. UI lagging issue(ANR may occur)

Upvotes: 1

user12517395
user12517395

Reputation:

You should delete the views from layout in reverse order. Check below:

for (int i = childNumber - 1; i > 1; i--){
    linearView.removeViewAt(i);
}

If you use while-loop, then you have to call getChildCount in every iteration

Upvotes: 2

haresh
haresh

Reputation: 1420

You are passing wrong layout might be :

LinearLayout myFirstLinearLayout = findViewById(R.id.linLay);
deleteLinearLayoutChild(myFirstScrollView); //
deleteLinearLayoutChild(myFirstLinearLayout) // pass myFirstLinearLayout

Also these are the method you can use ;

myFirstLinearLayout .removeView(view)//remove particular view
myFirstLinearLayout.removeViewAt(position);//remove view from particular position

Upvotes: 1

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