如何在Android中动态更改ListView高度？

Question

我需要在我的应用程序中动态更改ListView的高度.

有没有办法做到这一点？

Answer 1

这段代码帮助我实现了动态列表视图高度.

import android.view.View;
import android.view.ViewGroup;
import android.view.View.MeasureSpec;
import android.widget.ListAdapter;
import android.widget.ListView;

public class Utility {
    public static void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null) {
            // pre-condition
            return;
        }

        int totalHeight = 0;
        int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.AT_MOST);
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            listItem.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
            totalHeight += listItem.getMeasuredHeight();
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
        listView.requestLayout();
    }
}

在主Activity中使用此Utility类来更改listview高度.

 phraseListView=(ListView)findViewById(R.id.phrase_listview);
 phraseAdapter=new PhraseListAdapter(this);
 phraseListView.setAdapter(phraseAdapter);
 Utility.setListViewHeightBasedOnChildren(phraseListView);

取自这里

Answer 2

为了动态改变高度和宽度,试试这个

RelativeLayout.LayoutParams mParam = new RelativeLayout.LayoutParams((int)(width),(int)(height);
        listView.setLayoutParams(mParam);

你也可以使用LayoutParams.FILL_PARENT或LayoutParams.WRAP_CONTENT代替高度和宽度

Answer 3

您可以使用以下方法根据您的项目以编程方式设置listview的高度:

<ListView
        android:id="@+id/lvMenu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ffffff"
        />

用于设置listview高度的方法:

public static boolean setListViewHeightBasedOnItems(ListView listView) {

        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter != null) {

            int numberOfItems = listAdapter.getCount();

            // Get total height of all items.
            int totalItemsHeight = 0;
            for (int itemPos = 0; itemPos < numberOfItems; itemPos++) {
                View item = listAdapter.getView(itemPos, null, listView);
                float px = 500 * (listView.getResources().getDisplayMetrics().density);
                item.measure(View.MeasureSpec.makeMeasureSpec((int)px, View.MeasureSpec.AT_MOST), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                totalItemsHeight += item.getMeasuredHeight();
            }

            // Get total height of all item dividers.
            int totalDividersHeight = listView.getDividerHeight() *
                    (numberOfItems - 1);
            // Get padding
            int totalPadding = listView.getPaddingTop() + listView.getPaddingBottom();

            // Set list height.
            ViewGroup.LayoutParams params = listView.getLayoutParams();
            params.height = totalItemsHeight + totalDividersHeight + totalPadding;
            listView.setLayoutParams(params);
            listView.requestLayout();
            return true;

        } else {
            return false;
        }

    }

然后设置如下代码:

MenuAdapter menuAdapter = new MenuAdapter(context, R.layout.menu_item);
            lvMenu.setAdapter(menuAdapter);
            setListViewHeightBasedOnItems(lvMenu);

希望它会对你有所帮助.