android動態設置listview的寬

public class AllFileBrowser extends Activity {

      private int ScreenWIDTH;

      private  ListView listViewFile;

     protected void onCreate(Bundle savedInstanceState) {

            //獲取屏幕像素寬度

           DisplayMetrics dMetrics = new DisplayMetrics();
           getWindowManager().getDefaultDisplay().getMetrics(dMetrics);
           ScreenWIDTH = dMetrics.widthPixels;

            listViewFile = (ListView) findViewById(R.id.listView);

     }

    @Override
     public void onWindowFocusChanged(boolean hasFocus) {
           super.onWindowFocusChanged(hasFocus);
          listViewFile .getLayoutParams().width=ScreenWIDTH*6/9;//在代碼中能夠隨意設置listview的寬度
      }}