Android: TextView inside ScrollView: How to limit height

Question

I have put a TextView inside a ScrollView in Android:

<ScrollView android:layout_width = "fill_parent" android:layout_height = "wrap_content"> <TextView android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </ScrollView>

With this configuration, the scrollview grows to wrap the textview-content. How can I achieve that the scrollview takes only as much space as needed (for few text), but at the same time limit the size to 100dp (for long texts) ?

If I set layout_height to 100dp, a lot of space is wasted when the text is short
If I set layout_height to wrap_content, the scrollview runs the risk to fill the whole screen, but I don't want the whole sreen to only contain this scrollview. It should be 100dp heigh as a maximum.

The solution which was found:

Thank you for alls answers. For all people that have the same issue, here goes the accepted solution: Create a custom ScrollView class an use this class inside your xml file instead ScrollView. Then override onMeasure() method:

public class ScrollMyVew extends ScrollView { public static final int maxHeight = 100; // 100dp // default constructors @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { heightMeasureSpec = MeasureSpec.makeMeasureSpec(dpToPx(getResources(),maxHeight), MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } private int dpToPx(Resources res, int dp) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, res.getDisplayMetrics()); } }

This solution is taken from https://stackoverflow.com/a/23617530/3080611

This won't work for me because I have views below the scrollview. This issue was also commented by sreedhu madhu on the given thread — Brian
– Brian, Commented Sep 11, 2014 at 15:23
Then why not implement your own ScrollView and override onMeasure method? — Pedro Oliveira
– Pedro Oliveira, Commented Sep 11, 2014 at 15:24
Could you give some example please, I have never overriden onmeasure method before. — Brian
– Brian, Commented Sep 11, 2014 at 15:25

ChuongPham · Accepted Answer · 2014-09-11 15:50:10Z

2

Try something like this:

<ScrollView android:id="@+id/myScrollView" android:layout_width="match_parent" android:layout_height="0dp" android:fillViewport="true"/> <TextView android:id="@+id/myTextView" android:layout_width="match_parent" android:layout_height="wrap_content" android:maxHeight="your_value_here"/> </ScrollView>

edited Sep 11, 2014 at 15:50

answered Sep 11, 2014 at 15:15

ChuongPham

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4 Comments

Brian Over a year ago

Thanks for your answer, I just tried this out. Unfortunately, With this approach it seems impossible to limit the height. For me it works like wrapcontent and ignores the textview's height

ChuongPham Over a year ago

Have you tried setting the height of your TextView with maxHeight and wrap it within my ScrollView example above?

Brian Over a year ago

Yes, but it just won't work this way. But it is ok, i have found a solution now, thanks

Ernesto Vega Over a year ago

This doesn't work, it disables the scroll function and the text is truncated.

erad · Accepted Answer · 2014-09-11 15:12:08Z

Dynamically change the size of the TextView if the number of characters exceeds a certain amount.

Ex:

TextView v = (TextView) findViewById(R.id.sometext); LayoutParams lp = v.getLayoutParams(); lp.height = 50; v.setLayoutParams(lp);

I am looking for a xml solution, just because I'd like to avoid needing to set the height manually. On the contrary, I'd like the height to adjust automatically between the bounds of 0 and 100dp

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