CODEWITHSUNDEEP
androidandroid-layoutandroid-linearlayoutandroid-viewandroid-layoutparams
Solace
Solace

Reputation: 9020

How to know which LayoutParams class to use when creating a View programmatically?

Every ViewGroup class implements a nested class that extends ViewGroup.LayoutParams. So we LinearLayout.LayoutParams, RelativeLayout.LayoutParams, FrameLayout.LayoutParams etc.

Suppose I want to create a View, e.g. TextView programmatically. I will have to give it the required properties, like layout_width and layout_height, for which I will have to use a LayoutParams class. How will I know which LayoutParams class to use?

Upvotes: 1

Views: 947

Answers (2)

Francesc
Francesc

Reputation: 29330

If you only need view width and height, use a ViewGroup.LayoutParams, as all the other ones inherit from this one. You can assign a ViewGroup.LayoutParams where a RelativeLayout.LayoutParams, LinearLayout.LayoutParams, ... is expected.

Upvotes: 3

Gabe Sechan
Gabe Sechan

Reputation: 93708

It depends on what you're putting it into. If you're putting it into a linear layout, use LinearLayout.LayoutParams. For relative, use RelativeLayout.LayoutParams.

If you don't know the type- add it first via add, then use getLayoutParams to get it. Then change the layourparams. When you use the add() that doesn't take a params, the parent will make one for you.

Upvotes: 4

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