Android dynamically adjusts the width and height of View
In Android development, we often need to dynamically set the width and height of View according to different needs. This can be achieved through code rather than statically set in the XML layout.
1. Dynamically set the width of View
To dynamically set the width of a View, we can use the LayoutParams class. LayoutParams is a class used to describe the layout parameters of View, which contains various layout parameters, such as width, height, margins, etc.
Here is a sample code for setting the width of a View:
// 获取要设置宽度的View
View view = findViewById(R.id.my_view);
// 获取当前LayoutParams
ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
// 设置宽度为200像素
layoutParams.width = 200;
// 将修改后的LayoutParams应用到View
view.setLayoutParams(layoutParams);
In the above code, we first obtain the View to set the width through the findViewById() method. Then, we obtain the current LayoutParams through the getLayoutParams() method, then modify the width attribute to 200, and finally apply the modified LayoutParams to the View.
2. Dynamically set the height of View
The method of dynamically setting the height of a View is similar to the method of setting the width, and is also implemented through LayoutParams. Here is a sample code to set the height of View:
// 获取要设置高度的View
View view = findViewById(R.id.my_view);
// 获取当前LayoutParams
ViewGroup.LayoutParams layoutParams = view.get