set height of imageview as matchparent programmati

问题:

I need to set the height of an imageview as matchparent programatically.if it is a fixed height i know how to set.

but how can i set it as matchparent?

EDIT:

actually height of the parent layout is dynamic.so i need to make the height of the imageview as the height of parent.

回答1:

initiate LayoutParams .

assign the parent's width and height and pass it to setLayoutParams method of the imageview

回答2:

imageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

回答3:

imageView.getLayoutParams().height= ViewGroup.LayoutParams.MATCH_PARENT;

回答4:

imageView.setLayoutParams
    (new ViewGroup.MarginLayoutParams
        (width, ViewGroup.LayoutParams.MATCH_PARENT));

The Type of layout params depends on the parent view group. If you put the wrong one it will cause exception.

回答5:

For Kotlin Users

val params = mImageView?.layoutParams as FrameLayout.LayoutParams
params.width = FrameLayout.LayoutParams.MATCH_PARENT
params.height = FrameLayout.LayoutParams.MATCH_PARENT
mImageView?.layoutParams = params

Here I used FrameLayout.LayoutParams since my views( ImageView) parent is FrameLayout

回答6:

You can try this incase you would like to match parent. The dimensions arrangement is width and height inorder

web = new WebView(this);
        web.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

回答7:

I had same issue. Resolved by firstly setting :

imageView.setMinHeight(0);
imageView.setMinimumHeight(0);

And then :

imageView.getLayoutParams().height= ViewGroup.LayoutParams.MATCH_PARENT;

setMinHeight is defined by ImageView, while setMinimumHeight is defined by View. According to the docs, the greater of the two values is used, so both must be set.

回答8:

You can use the MATCH_PARENT constant or its numeric value -1.