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我试图在相对布局的中心显示新视图。但新视图始终位于屏幕顶部。

LayoutInflater inflater = (LayoutInflater)this.getSystemService("layout_inflater");
dest = inflater.inflate(R.layout.searchlayout, ViewGroup)      
this.findViewById(R.layout.pdfview));
RelativeLayout.LayoutParams params = new     RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,  RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.CENTER_VERTICAL);
dest.setLayoutParams(params);
this.addContentView(dest, params);
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