以编程方式设置视图的宽度/高度

Question

我有一个片段，在onCreate方法中，我添加了一个FrameLayout。对于这个FrameLayout，我添加了一个从View扩展的类的对象。

现在我想将此视图对象的宽度和高度设置为wrap_content。

这是我的代码和我尝试的内容：

@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>

DrawingImg类从View扩展并使用canvas

绘制图像

public class DrawingImg extends View {

....

}

我的目标是框架布局只占据所需的宽度和高度

Answer 1

试试这个：

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

Answer 2

使用：

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

而不是：

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