Android - RelativeLayout CENTER_VERTICAL和BELOW问题

Question

我想要一个TextView顶部和它下面的VideoView。我想要VideoView作为中心verical和低于TextView。我正在使用RelativeLayout。

我试图做到这一点代码：

RelativeLayout layout = new RelativeLayout(this); 
TextView tv = new TextView(this); 
tv.setText("Hello"); 
tv.setGravity(Gravity.RIGHT); 
tv.setTextColor(Color.WHITE); 
tv.setId(1); 

RelativeLayout.LayoutParams one = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 

one.addRule(RelativeLayout.ALIGN_PARENT_TOP); 
one.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 


RelativeLayout.LayoutParams two = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); 
two.addRule(RelativeLayout.CENTER_VERTICAL); 
two.addRule(RelativeLayout.BELOW, 1); 

VideoView mVideoView = new VideoView(this); 

layout.addView(tv, one); 
layout.addView(mVideoView, two); 

setContentView(layout); 

的VideoView被放置在TextView下方，但VideoView没有垂直居中。

Answer 1

您制作了您的VideoView fill_parent/fill_parent，这使其具有与其父亲RelativeLayout相同的尺寸。如果它与RelativeLayout一样大，则居中不能真正起作用。此外，您不能让VideoView既不在TextView下面，也不在父视图中垂直居中;它是一个或另一个。相反，您可以将ViewView居中并将TextView放在它上面。