How to change the image size added programmatically

Question

I have a LinearLayout which I add images when i click a button, I was trying to use LayoutParamsto change the width and height because doesn't fit as at should, and I always got a null reference, the problem is I can't make any reference because is not a static ImageView.

This is how I add images inside of LinearLayout :

public void AddNewImages(Context context,Bitmap bitmap){
    ImageView img = new ImageView(context);
    img.setScaleType(ImageView.ScaleType.FIT_XY);
    img.setImageBitmap(bitmap);
    linearImages.addView(img);
    bitmapArray.add(bitmap);
    indexTags++;
}

XML :

<LinearLayout
    android:orientation="vertical"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <HorizontalScrollView
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <LinearLayout
            android:orientation="horizontal"
            android:id="@+id/linearImages"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <Button
                android:layout_gravity="center"
                android:id="@+id/add_btn"
                android:text="Add"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </HorizontalScrollView>

get imageview from linearImages child – Pavya Jan 31 '17 at 08:31 — Pavya, Jan 31 '17 at 08:31

score 1 · Accepted Answer · edited Jan 31 '17 at 09:57

1

First you have to find the Imageview which you added in linearlayout and set the size i.e

for(int i=0;i<linearImages.getChildCount();i++)
{
    ImageView image=(ImageView)linearImages.getChildAt(i);
    image.getLayoutParams().height=100;
    image.getLayoutParams().width=100;
}

edited Jan 31 '17 at 09:57

Dani M

1,173
1
15
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answered Jan 31 '17 at 09:28

Basavannevva

304
1
6

where should I put this for? right after `indexTags++;` ? I tried and my app crash without give any error – Jan 31 '17 at 15:46

score 0 · Answer 2 · edited Jan 31 '17 at 09:35

0

ImageView imgae = (ImageView) linearImages.getChildAt(0); // For first image

and then set LayoutParam.

edited Jan 31 '17 at 09:35

answered Jan 31 '17 at 08:31

D.J

1,439
1
12
23

score 0 · Answer 3 · edited May 23 '17 at 12:18

0

You are creating ImageView dynamically so you have to first set layoutParameters for it and then you can set height and width of imageview. Refer this NullPointerException while setting LayoutParams question

edited May 23 '17 at 12:18

Community

1
1

answered Jan 31 '17 at 10:46

Ami Trambadia

101
6

How to change the image size added programmatically

3 Answers3