How to solve the null object reference?

Question

How to set width for image progragmaticall?

This is my code,

    txtone = (ImageView)findViewById(R.id.imageView);
    txttwo = (ImageView)findViewById(R.id.imageView2);
    height = metrics.heightPixels;
    width = metrics.widthPixels;
    if (height == 800 && width == 1217) {
    int a = txtone.getMeasuredWidth();
    txtone.getLayoutParams().width = 280;
    txttwo.getLayoutParams().width = 280;
    txtthree.getLayoutParams().width = 280;
    txtone.requestLayout();
    txttwo.requestLayout();
    txtthree.requestLayout();

It means your txtone is not yet inflated and you are doing layout parameter operations on it — Aman Grover, Sep 02 '16 at 11:37
@Aman Groverca. 'FrameLayout. LayoutParams params = (FrameLayout.LayoutParams) txtone.getLayoutParams();' i tried this but getting same error — Udhaya, Sep 02 '16 at 11:47

Vladyslav Matviienko · Accepted Answer · 2016-09-02T12:07:22.043

1

you try to use one of txttwo txtthree before actually initializing them. One of them is null, when you call

txttwo.getLayoutParams().width = 280;
txtthree.getLayoutParams().width = 280;

As for your code, you didn't initialize txtthree

edited Sep 02 '16 at 12:07

answered Sep 02 '16 at 11:40

Vladyslav Matviienko

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i did it. but getting same error – Udhaya Sep 02 '16 at 11:45
@Aruna, did what? I didn't suggest a solution, I explained why you get error. – Vladyslav Matviienko Sep 02 '16 at 11:46
please check my edited code – Udhaya Sep 02 '16 at 11:55
Thank you so much. yes i didn't initialized txtone – Udhaya Sep 02 '16 at 12:04
@Aruna, you didn't initialize txtthree – Vladyslav Matviienko Sep 02 '16 at 12:06

How to solve the null object reference?

1 Answers1