[Android] 動態設定ListView的高度

  

//建立函數將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); 
    }
   

//建立函數動態設定ListView的高度
    public void setListViewHeightBasedOnChildren(ListView listView) {
        //取得ListView的Adapter

        ListAdapter listAdapter = listView.getAdapter();
        //固定每一行的高度
        int itemHeight = 50;
        if (listAdapter == null) {
            return;
        }
        int totalHeight = 0;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            totalHeight += Dp2Px(getApplicationContext(),itemHeight)+listView.getDividerHeight();
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight;

        listView.setLayoutParams(params);
    }

使用時將ListView傳入

ListView lv_set_meal = (ListView) findViewById (R.id.lv_set_meal);

Adapter_ListView adapter = new Adapter_ListView(context, arraySetMeal_item);                
lv_set_meal.setAdapter(adapter);
setListViewHeightBasedOnChildren(lv_set_meal);// 必須放在setAdapter後面