Set width/height of view programmatically

Question

I have a fragment and in its onCreate method, I add a FrameLayout . To this FrameLayout I add an object of a class which extends from View.

Now I want to set the width and height of this view object to wrap_content .

This is my code and what I've tried:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    View view = inflater.inflate(R.layout.fragmentTest, container, false);

    FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.drawingImg);

    DrawingImg drawingImgView = new DrawingImg();
    drawingImgView.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
    drawingImgView.getLayoutParams().width = ViewGroup.LayoutParams.WRAP_CONTENT;

    // adding the view to the framelayout with the drawn picture
    frameLayout.addView(drawingImgView);

    return view;
}

fragmentTest.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawingImg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

</FrameLayout>

The DrawingImg class extends from View and draws an image with canvas

public class DrawingImg extends View {

....

}

My aim is that the frame layout occupies only the width and height it needs

Answer 1

尝试这个：

drawingImgView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

Answer 2

Use:

drawingImgView.setLayoutParams(new FrameLayout.LayoutParams(
           FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT));

Instead of:

drawingImgView.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
drawingImgView.getLayoutParams().width = ViewGroup.LayoutParams.WRAP_CONTENT;