如何在WearablListView设置布局topEmptyRegion？ [英] How to set layout for topEmptyRegion in WearablListView?

问题描述

断开连接区域是顶级的空区域时，该列表视图滚动那向上滚动。如何设置的布局是什么？谢谢你。

The "Disconnected" region is the top empty region thats scrolls up when this listview is scrolled. How do I set layout for that? Thanks.

推荐答案

使用它是这样实现的hierarchyviewer在你的例子展望：

Looking at your example using the hierarchyviewer it is implemented like this:

一个RelativeLayout的持有WearableListView

A RelativeLayout holds the 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>

在你的onCreate（）活动的方法添加标题：

In your onCreate() method of the Activity add the header:

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) {}
    });

要概括起来讲，你有WearableListView上述视图和滚动ListView控件时，您只需滚动标题淡出人们的视线。

To sum it up, you have a View above the WearableListView and when scrolling the ListView, you simply scroll the header out of sight.

在原来的问题又来来看，雁是：有没有布局，即提供，您可以更改。你必须自己做。

Looking again at the original question, the anser is: There is no layout, that is provided and that you can change. You have to do it yourself.

希望这有助于。

修改2014年9月17日

如果您想报头中从顶部滚动（如谷歌的例子），添加一个文件RES /动画/ slidein_top.xml：

If you want the header to scroll in from the top (as in the google example), add a file 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>

这code至您的活动：

and this code to your activity:

@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);
    }
}

这应该做的伎俩。

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