re-setting a TextView height programmatically

Question

I want to reset a textView height after I have added it to the main window in the xml file.

inside a RelativeLayout,

  <TextView
      android:id="@+id/text_l"
      android:layout_width="50sp"
      android:layout_height="50sp"
      android:layout_alignParentTop="true"
      android:layout_centerHorizontal="true"
      android:layout_marginLeft="10sp"
      android:layout_marginTop="145dp"
      android:gravity="center"
      android:textAppearance="?android:attr/textAppearanceLarge"
      android:textColor="#000000" >
  </TextView>

I just want to change it from 50 to 70:

I tried:

 TextView text = (TextView)findViewById(R.id.text_l);
 text.setHeight(70);

but nothing changed.

Try this: http://stackoverflow.com/questions/3522224/how-to-dynamically-set-textview-height-android — Nitesh Khosla, Feb 07 '12 at 11:33

score 111 · Accepted Answer · edited Apr 18 '17 at 11:34

111

You should change it via LayoutParams:

LayoutParams params = (LayoutParams) textView.getLayoutParams();
params.height = 70;
textView.setLayoutParams(params);

EDIT

You should not use sizes in pixels in you code, use dimensions for this:

dimens.xml:

<dimen name="text_view_height">50dp</dimen>

In code:

params.height = getResources().getDimensionPixelSize(R.dimen.text_view_height);

edited Apr 18 '17 at 11:34

SpyZip

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answered Feb 07 '12 at 11:28

Jin35

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The bizare thing here is: textview.setheight(...) did work on some of my test devices, even though in contrast to the documentation of the setHeight function of TextView it does NOT change the layout parameters of the view. But on one of my test devices (Xperia ray, Android 4.0.4) this worked only in landscape but not in portrait mode. Changing the height in the layout params as you suggested worked fine on all of my test devices. – Nantoka Jun 17 '13 at 23:48
It didn't work for me. Im afraid it doesn't work in newer APIs. Once the TextView has been layered, setting height in the TextView has no effect. – cesards Mar 08 '17 at 12:01
1

Note that **TextView textView = new TextView(context); textView.getLayoutParame()** weill be null. You should judge null before use it. – BertKing Nov 16 '17 at 11:21

score 11 · Answer 2 · edited Sep 08 '15 at 06:36

11

Pragmatically you can set textview height like:

private TextView mTxtView;
int height = 50; //your textview height
mTxtView.getLayoutParams().height = height;

edited Sep 08 '15 at 06:36

kenju

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answered Aug 04 '15 at 10:38

Dhruv Raval

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4

I prefer to do this, rather than finding the correct Layoutparams class – Roisgoen Dec 15 '15 at 23:44
that's true @Roisgoen – Dhruv Raval Dec 16 '15 at 04:48
What calls for special attention is that if you use the textView to getLayoutParams(), it would be better to judge null? – BertKing Nov 16 '17 at 10:52

score 4 · Answer 3 · answered Sep 17 '13 at 10:55

you can dynamically set width and height of textview by

private TextView mTxtView;
private int screenWidth, screenHeight;
Display display = getWindowManager().getDefaultDisplay(); 
    screenWidth = display.getWidth();
    screenHeight = display.getHeight();


LayoutParams params = mTxtView.getLayoutParams();
    params.width = screenWidth-30;
    mTxtView.setLayoutParams(params);

score 2 · Answer 4 · answered Jun 03 '19 at 15:40

In Kotlin with DP to pixels translation

  changeTextHeight.setOnClickListener { view ->

         // random height for testing
        val randomHeightInDP = Random().nextFloat() * (50.0f - 10.0f) + 10

        // set Height in pixels
        hello.layoutParams.height = convertDpToPixel(randomHeightInDP, applicationContext)
         //refresh layout
        hello.requestLayout()


    }

Convert DP to pixels, see this post:

fun convertDpToPixel(dp: Float, context: Context): Int {
        return (dp * (context.resources.displayMetrics.densityDpi.toFloat() / DisplayMetrics.DENSITY_DEFAULT)).toInt()
    }

RahimpoorDeveloper · Answer 5 · 2019-11-08T09:28:46.680

the sample way for this if you want to use dimen

first, you should set size in dimen XML file.

<dimen name="text_height">50dp</dimen>
<dimen name="text_width">50dp</dimen>

and

text_l.getLayoutParams().height = 
     getResources().getDimensionPixelSize(R.dimen.text_height);

text_l.getLayoutParams().width = 
     getResources().getDimensionPixelSize(R.dimen.text_width);

Or

if you want to set just int (for example we wanna set 50dp height and 100dp width)

text_l.getLayoutParams().height = 50 * 3;
text_l.getLayoutParams().width= 100 * 3;

score 1 · Answer 6 · answered Jan 01 '19 at 05:18

I know this is an old question, but for the sake of others who might find this, there are scenarios where you should call textView.requestLayout() after changing the layout parameters. While it my be fine to omit it if you are simply changing the layout parameters as a one time thing before the layout is drawn. In my case, I wanted to change the height parameter of a TextView based on a radio button selection using onCheckedChangedListener, but the TextView height would only update the first time it was drawn. Adding requestLayout() solved this problem.

TextView tv;
ViewGroup.LayoutParams params = tv.getLayoutParams();
params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
if(!tv.isInLayout()) {//make sure it isn't currently in a layout pass 
    tv.requestLayout();//request a layout pass
 }

You helped me, its too much old but you never know :D – Milos Jun 09 '19 at 21:43 — Milos, Jun 09 '19 at 21:43

re-setting a TextView height programmatically

6 Answers6

In Kotlin with DP to pixels translation

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