设置RelativeLayout的宽高：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_item);
relativeView=(RelativeLayout)findViewById(R.layout.grid_item);
new Handler().postDelayed(new Runnable(){
@Override
public void run(){
relativeView.setLayoutParams(new RelativeLayout.LayoutParams(100,200));
}
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