Android 动态添加视图到活动布局
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dynamically adding a view to activity layout
提问by Blair Jones
I have a custom view (an extension of a TextView) that I want to dynamically add to my Layout (don't want to include it in the main.xml file).
我有一个自定义视图（TextView 的扩展），我想动态添加到我的布局（不想将它包含在 main.xml 文件中）。
The book says to fetch the RelativeLayout using findViewById() in my java code then create a new instance of my custom view, then use addView on the RelativeLayout to add the new view.
这本书说在我的java代码中使用findViewById()获取RelativeLayout，然后创建我的自定义视图的新实例，然后在RelativeLayout上使用addView来添加新视图。
I'm not getting any errors, but when I click my button to add the new view, nothing is happening (view isn't being added). Do I need to set additional properties on my custom view (layout width, layout height for example) in order for it to be shown?
我没有收到任何错误，但是当我单击按钮添加新视图时，什么也没有发生（没有添加视图）。我是否需要在自定义视图上设置其他属性（例如布局宽度、布局高度）才能显示它？
EDIT: adding code
编辑：添加代码
// changed to an imageview as I thought it might be easier to see an image
RelativeLayout rel = (RelativeLayout) findViewById(R.id.rellay);
MyCustomImageView mciv = new MyCustomImageView(null);
mciv.setId(5);
LayoutParams p = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
mciv.setLayoutParams(p);
mciv.setImageResource(R.drawable.someImage);
rel.Addview(mciv);
采纳答案by Mathias Conradt
Please post your code where you add the view. But yes, you might be missing the params for width and height. Try something like
请在添加视图的位置发布您的代码。但是，是的，您可能缺少宽度和高度的参数。尝试类似
LayoutParams p = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.FILL_PARENT);
txtView.setLayoutParams(p);
or what you would like the width and height to be. Also in xml layout, layout_width and layout_height are required attributes.
或者你想要的宽度和高度是什么。同样在 xml 布局中，layout_width 和 layout_height 是必需的属性。
