如何在WearablListView中设置topEmptyRegion的布局？

Question

"已断开连接"区域是滚动此列表视图时向上滚动的顶部空白区域.我该如何设置布局？谢谢.

Answer 1

使用hierarchyviewer查看您的示例,它实现如下:

RelativeLayout保存WearableListView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/llist"
    android:orientation="vertical">

    <android.support.wearable.view.WearableListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

在Activity的onCreate()方法中添加标题:

public class TestListViewActivity extends Activity implements WearableListView.ClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list);

    RelativeLayout l = (RelativeLayout)findViewById(R.id.llist);

    // Below is your header e.g. "disconnected"
    // You can do it in code, or you have already defined it in the above xml layout
    final TextView header = new TextView(this);
    header.setBackgroundColor(getResources().getColor(android.R.color.darker_gray));

    final WearableListView listView = (WearableListView)findViewById(R.id.list);

    // Add the header, or you have already defined it in the xml layout
    l.addView(header, 0);

    // Now comes the scrolling part (makes the header disappear)
    listView.addOnScrollListener(new WearableListView.OnScrollListener() {
        @Override
        public void onScroll(int i) {}

        @Override
        public void onAbsoluteScrollChange(int i) {
            // Do only scroll the header up from the base position, not down...
            if (i > 0)
                header.setY(-i);
        }

        @Override
        public void onScrollStateChanged(int i) {}

        @Override
        public void onCentralPositionChanged(int i) {}
    });

总而言之,您在WearableListView上方有一个View,当滚动ListView时,您只需将标题滚动到视线之外.

再看一下原始问题,anser是:没有布局,提供了,你可以改变.你必须自己做.

希望这可以帮助.

编辑17.09.2014:

如果您希望标题从顶部滚动(如在google示例中),请添加文件res/anim/slidein_top.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="800"
        android:fromYDelta="-100%"
        android:toYDelta="0%" />
</set>

以及此代码到您的活动:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    if(hasFocus){
        RelativeLayout l = (RelativeLayout)findViewById(R.id.llist);
        final Animation slide = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.slidein_top);
        // find the header or cache it elsewhere
        l.getChildAt(0).startAnimation(slide);
    }
}

这应该可以解决问题.

Answer 2

对于那些仍然在看这个的人,我想建立在boun的答案上.onAbsoluteScrollChange现在已弃用,代码应放入其中onScroll.

但是,参数onScroll是自上次onScroll调用以来的变化量,其中参数onAbsoluteScrollChange是滚动后的当前位置; 因此,我们必须稍微修改一下代码.

要解决已弃用的方法,请从中删除代码onAbsoluteScrollChange并执行以下操作:

@Override
public void onScroll(int i) {
    header.setY(header.getY() - i);
}