Android 如何在一个活动中一个接一个地显示 2 个列表视图 [英] Android how to display 2 listviews in one activity one after the other

问题描述

我已使用此代码显示 2 个列表视图，一个在另一个之上.

I have used this code to display 2 list view one on top of the other.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    android:background="#f00" >
</ListView>

<ListView
    android:id="@+id/listView2"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    android:background="#0f0" >
</ListView>

问题在于，这会导致 2 个列表视图各自占据屏幕的一半.我正在向这样的两个列表添加标题.

The problem is that, this causes the 2 listviews to each occupy half of the screen. I am adding a header to both lists like this.

LevelAdapter adapter = new LevelAdapter(getActivity(),
            R.layout.list_item, weather_data);

    View header = inflater.inflate(R.layout.header2, null);
    View header2 = inflater.inflate(R.layout.header, null);
   lv1.addHeaderView(header);
   lv2.addHeaderView(header2);
    lv1.setAdapter(adapter);
    lv2.setAdapter(adapter);

我希望在第一个列表结束后显示第二个列表的标题.我该怎么做?如何使列表视图出现，以便在第一个视图结束时第二个视图开始?谢谢

I would like the header of the second list to appear after the first list is over. How do i do this?How do i make the listviews appear such that the second one starts when the first one is over ? Thanks

推荐答案

像这样使用:

删除线性布局.使用相对布局并在其中放置两个列表视图，如下所示.

Remove Linear layout. use relative layout and inside that place your two list view like this.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/scrollojt"
android:fillViewport="true" >

   <RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >

<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#f00" >
 </ListView>

 <ListView
android:id="@+id/listView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/listView1"
android:background="#0f0" >
</ListView>
    </RelativeLayout>
  </ScrollView>

添加 Utility.java

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();
    }
}

在您的活动中:

 lv1.setAdapter(adapter);
 lv2.setAdapter(adapter);

Utility.setListViewHeightBasedOnChildren(lv1);
Utility.setListViewHeightBasedOnChildren(lv2);

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