Question

我对如何在RelativeLayout中创建视图（以编程方式）感到困惑。目前我正在使用.layout来定位RelativeLayout中的视图（在java中创建），但是如果我尝试使用LayoutParams添加视图来定位视图＆amp;不使用.layout，这些视图不会添加到relativelayout。那是为什么？

public class MyCustomRelativeLayout extends RelativeLayout
{

 public void addViews(){
  MyCustomImageView myImage = new MyCustomImageView(context);
  myImage.setLayoutParams(new LayoutParams(WRAP_CONTENT, WRAP_CONTENT));
  myImage.setImageResource(R.drawable.ic_launcher); 
  addView(myImage); // this one isn't visible/added in RelativeLayout.


  ImageView image = new ImageView(context);
  image.layout(0,0,300,400);
  image.setImageResource(R.drawable.garden);
  addView(image); // this one is visible/added in Relativelayout
 }
}

public class MyCustomImageView extends ViewGroup
{
   public void onLayout(int l, int t, int r, int b)
   {
       this.layout(l,t,r,b);
   }

   public void addImageViews()
   {
      ImageView mImage = new ImageView(context);
      mImage.layout(0,0,200,200);
      mImage.setImageResource(R.drawable.hello);
      addView(mImage); // this one is visible/added in Relativelayout

      ImageView mImage2 = new ImageView(context);
      mImage2.layout(0,0,70,70);
      mImage2.setImageResource(R.drawable.hello2);
      addView(mImage2); // this one is visible/added in Relativelayout
   }
}

为什么会这样？ And When to use .layout instead of LayoutParams?

最好的问候

Answer 1

LayoutParams dosn不会对视图进行充气。它只是向父母描述了他如何使观点膨胀。

View.Layout（）用于添加视图

1 个答案: