Android動態改變ListView的高度，androidlistview

Android動態改變ListView的高度，androidlistview

定義一個函數將dp轉換為像素

public int Dp2Px(Context context, float dp) {

       final float scale = context.getResources().getDisplayMetrics().density;

       return (int) (dp * scale + 0.5f);

  } 

定義函數動態控制listView的高度

public void setListViewHeightBasedOnChildren(ListView listView) {

      //擷取listview的適配器

      ListAdapter listAdapter = listView.getAdapter(); //item的高度

      if (listAdapter == null) {

            return;

      }

      int totalHeight = 0;

      for (int i = 0; i < listAdapter.getCount(); i++) {

             View listItem = mAdapter.getView(i, null, listView);

             listItem.measure(0, 0); //計運算元項View 的寬高 //統計所有子項的總高度

             totalHeight += Dp2Px(getApplicationContext(),listItem.getMeasuredHeight())+listView.getDividerHeight();

       }

      ViewGroup.LayoutParams params = listView.getLayoutParams();

      params.height = totalHeight; listView.setLayoutParams(params);

 }

在每次listView的adapter發生變化後，要調用setListViewHeightBasedOnChildren(listView)更新介面