Android动态添加View的问题解决方法

    private void ChangeView()
    {
        ly.removeAllViews();
        LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
        View layout = inflater.inflate(R.layout.grid,null);
        GridView gridview = (GridView)layout.findViewById(R.id.gridview);
        gridview.setAdapter(new ItemAdapter(MainActivity.this));
        gridview.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView arg0, View arg1,
                    int arg2, long arg3) {
            }
            public void onNothingSelected(AdapterView arg0) {
            }
        });

        ly.addView(gridview);
    }

ly.addView(gridview,new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));