Android动态更改布局大小

Question

我想要一个方形FrameLayout填充它的父宽度并且其高度与其宽度匹配。我已经尝试在布局中添加一个addOnLayoutChangeListener，但我不能从里面调用requestLayout，所以我无法告诉它调整大小。

我能做些什么来使它的高度等于它在运行时的宽度？

Answer 1

简单的办法就是延长FrameLayout

public class SquareFrameLayout extends FrameLayout { 

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     super.onMeasure(widthMeasureSpec, widthMeasureSpec); 
      // or you can use this if you want the square to use width as it basis 
      super.onMeasure(widthMeasureSpec, widthMeasureSpec); 
    } 
} 

使用您的布局像下面

<your.package.SquareFrameLayout 
    android:layout_width="match_parent" 
    ......> 
     <!-- other child views --> 
</your.package.SquareFrameLayout> 

Answer 2

您获得您的视图后只是做以下

ViewGroup.LayoutParams lp = view.getLayoutParams(); 
    Display display = ((AppCompatActivity) context).getWindowManager().getDefaultDisplay(); 
    Point size = new Point(); 
    display.getSize(size); 
    int screenWidth = size.X; 
    lp.height = screenWidth; 
    view.setLayoutParams(lp);