当Listview为空时显示提示字符，而且不为ListActivity的子类

TextView emptyView = new TextView(this);
emptyView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
 LayoutParams.FILL_PARENT));
emptyView.setText("你尚未历史记录");
emptyView.setPadding(8, 8, 8, 8);
emptyView.setTextSize(30);
emptyView.setGravity(Gravity.CENTER); 
emptyView.setVisibility(View.GONE); 
LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);    
addContentView(emptyView, params);    
lvrecords.setEmptyView(emptyView); 

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