How to make the height of a dynamically created TextView exactly 50dp in Android?

Question

I want to make the height of a dynamically created TextView to be 50dp. I tried making a dimens.xml file with the code

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

And then I use

int pixels = getResources().getDimensionPixelSize(R.dimen.imageview_height);

and finally on the generated TextView I simply use.

textView.setHeight(pixels);

However when I run it, my app crashes and says app name keeps stopping.

Answer 1

You can set it with this:

textView.setLayoutParams(new LayoutParams(width, height));

But there are different LayoutParams depending on the layout type. Use the layout that your view is in. Ex: if your view is in a LinearLayout , use LinearLayout.LayoutParams

See this post for more info: Android set height and width of Custom view programmatically

Answer 2

Android throws exception when either height or width is not set programmatically

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) someLayout.getLayoutParams();
params.height = 130;
someLayout.setLayoutParams(params);

so by the above code, we are getting the layout params of the view itself and then set the height programmatically

Answer 3

您可以使用以下方法进行操作

int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 5, getResources().getDisplayMetrics());

Answer 4

Calculation from dps -> pixel ......

final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (dps * scale + 0.5f);

Then set that pixel for programatic use...