如何在Android上显示RelativeLayout和ImageView？

Question

I have added a RelativeLayout and ImageView dynamically, but it's not displaying in the emulator when I run the application. Why?

My code:

RelativeLayout relativeLayout = new RelativeLayout(this);
    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(     
            RelativeLayout.LayoutParams.WRAP_CONTENT, 
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    ImageView iv = new ImageView(this);         
    iv.setImageResource(R.drawable.freshface_mmm);
    relativeLayout.addView(iv,lp);

Answer 1

您需要使用以下方法将相对布局添加到活动中：

    setContentView(view, params);

Answer 2

如果要添加视图，则应使用此方法：

ViewGroup relativeLayout = new RelativeLayout(getActivity());

Answer 3

将ImageView的位置设置为其父对象的中心，左侧，底部等。