在Android中以编程方式更改线性布局高度

Question

I am trying to change the height of linear layout programmatically. When I use

ll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

I am getting exception:

java.lang.ClassCastException: android.view.ViewGroup$LayoutParams

Answer 1

我得到了解决方案LinearLayout.LayoutParams类

ll.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

Answer 2

My guess is you're importing a different LayoutParams. Try a fully qualified version:

ll.setLayoutParams(new android.view.ViewGroup.LayoutParams(
    android.view.ViewGroup.LayoutParams.FILL_PARENT,
    android.view.ViewGroup.LayoutParams.WRAP_CONTENT
));

Answer 3

When you first include LayoutParams in your code and hit Cntrl+Shift+Enter to automatically import the required files, you are displayed a list of all the packages. Make sure you import the right package in your code.

import android.view.ViewGroup.LayoutParams;