您可以在 Android Wear 的 GridViewPager 中使用 WatchViewStub 吗? [英] Can you use a WatchViewStub in a GridViewPager for Android Wear?

问题描述

我有一个可以独立工作的 WatchViewStub - 它在适当的方形或圆形 android 磨损模拟器上显示正确的布局.但是当我尝试在 GridViewPager 中使用 WatchViewStub 时，它总是显示方形(或矩形)布局，即使在圆形模拟器上也是如此.两者一起使用能成功吗?

I have a WatchViewStub that works fine on its own - it displays the correct layout on the appropriate square or round android wear emulator. But when I try and use the WatchViewStub in a GridViewPager it always displays the square (or rectangle) layout even on the round emulator. Is it possible to use the two together successfully?

以下是一些代码片段:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_wear);

    GridViewPager pager = (GridViewPager) findViewById(R.id.activity_wear_pager);
    pager.setAdapter(new gridViewPagerAdapter());

    DotsPageIndicator dotsPageIndicator = (DotsPageIndicator) findViewById(R.id.activity_wear_page_indicator);
    dotsPageIndicator.setPager(pager);
}

这是 gridViewPagerAdapter:

Here's the gridViewPagerAdapter:

private class gridViewPagerAdapter extends GridPagerAdapter {
    @Override
    public int getColumnCount(int arg0) { return 2; }

    @Override
    public int getRowCount() { return 1; }

    @Override
    protected Object instantiateItem(ViewGroup container, int row, int col) {
        View view = null;

        if (col == 0) {
            view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.read_page_stub, container, false);
            WatchViewStub stub = (WatchViewStub) view.findViewById(R.id.read_page_stub);
            stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
                @Override
                public void onLayoutInflated(WatchViewStub stub) {
                }
            });
        }
        else {
            view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.find_page_stub, container, false);
            WatchViewStub stub = (WatchViewStub) view.findViewById(R.id.find_page_stub);
            stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
                @Override
                public void onLayoutInflated(WatchViewStub stub) {
                }
            });
        }

        container.addView(view);
        return view;
    }

    @Override
    protected void destroyItem(ViewGroup container, int row, int col, Object view) {
        container.removeView((View)view);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }
}

这是activity_wear.xml:

Here is activity_wear.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.wearable.view.GridViewPager
        android:id="@+id/activity_wear_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:keepScreenOn="true"/>

    <android.support.wearable.view.DotsPageIndicator
        android:id="@+id/activity_wear_page_indicator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal|bottom">
    </android.support.wearable.view.DotsPageIndicator>

</FrameLayout>

这里是 read_page_stub.xml:

Here is read_page_stub.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.wearable.view.WatchViewStub
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/read_page_stub"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:rectLayout="@layout/read_page_rect"
    app:roundLayout="@layout/read_page_round"
    tools:context=".WearApplication"
    tools:deviceIds="wear">
</android.support.wearable.view.WatchViewStub>

然后我的视图有两个布局.他们开始于:

Then I have two layouts with my views. They start with:

read_page_rect.xml:

read_page_rect.xml:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/scroll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".WearApplication"
    tools:deviceIds="wear_square">

read_page_round.xml:

read_page_round.xml:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/scroll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".WearApplication"
    tools:deviceIds="wear_round">

我为 find_page_stub、find_page_rect 和 find_page_round 设置了相同类型的布局.

I have the same type of layout setup for find_page_stub, find_page_rect, and find_page_round.

推荐答案

如果 WatchViewStub 不显示圆形布局，则表示它没有收到 WindowInsets 对象适当地.GridViewPager 必须在途中的某个地方使用它.

If WatchViewStub doesn't show the round layout it means it doesn't receive the WindowInsets object properly. GridViewPager must be consuming it somewhere on the way.

您可以尝试修复它.这样做的方法是(首先是一些理论):

You can try and fix it. The way to do this is (first some theory):

1) 首先阅读 <代码>View.dispatchApplyWindowInsets 和 View.onApplyWindowInsets

1) start by reading about View.dispatchApplyWindowInsets and View.onApplyWindowInsets

2) 这两个方法绑定在 View 中的方式是这样的:dispatchApplyWindowInsets 被调用并检查是否有任何侦听器；如果是，它只将 WindowInsets 传递给 listener；如果没有，它会将 WindowInsets 传递给 onApplyWindowInsets.

2) the way these two methods are tied in a View is this: dispatchApplyWindowInsets is called and checks if there is any listener; if yes, it delivers the WindowInsets to the listener only; if no, it delivers the WindowInsets to onApplyWindowInsets.

3) 在 ViewGroup(并且 GridViewPager 是一个 ViewGroup)中，它遍历子元素并检查插入是否被消耗；如果是，它停止提供它们；

3) in a ViewGroup (and GridViewPager is a ViewGroup) it iterates over the children and checks if the insets were consumed; if yes, it stops delivering them;

4) 在任何时候，任何 View/ViewGroup 都可以决定停止传送 WindowInsets；当它这样做时，任何依赖它的孩子在回合中都不会表现得很好；

4) at any point any View/ViewGroup can decide to stop delivering the WindowInsets; when it does, any children depending on it won't behave properly on round;

现在一些练习:

5) 您可以为层次结构中的任何视图创建子类；使用 GridViewPager 执行此操作并开始尝试覆盖 dispatchApplyWindowInsets 和 onApplyWindowInsets.我的猜测是第一个应该足够了.

5) you can create a subclass of any view you have in your hierarchy; do this with GridViewPager and start experimenting with overriding dispatchApplyWindowInsets and onApplyWindowInsets. My guess is the first one should be enough.

6) 在 dispatchApplyWindowInsets 的覆盖中，迭代子项并调用 dispatchApplyWindowInsets 到每个子项；这样 WatchViewStub 应该使用之前的 isRound()->true 方法接收未改变的 WindowInsets

6) in the override of dispatchApplyWindowInsets iterate over children and call dispatchApplyWindowInsets to every of them; this way WatchViewStub should receive unaltered WindowInsets with the previous isRound()->true method

7) 最后别忘了调用super.dispatchApplyWindowInsets(windowInsets);你想让 GridViewPager 用插图做它需要的事情.

7) finally, don't forget to call super.dispatchApplyWindowInsets(windowInsets); you want to let GridViewPager do what it needs with the insets.

呼，很长，但应该可以帮助你，并让你了解为什么事情会以这种方式发生.我认为我们有一个错误可以解决这个 GridViewPager 问题，所以也许在下一个版本之后你就不必处理这个问题了.

Phew, pretty long, but should help you and also give you some understanding why things are happening the way are happening. I think we have a bug standing to fix this GridViewPager issue, so maybe after the next release you won't have to deal with this.

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