统筹布局自定义布局的行为从来没有得到所谓的 [英] Coordinator layout custom layout behavior never getting called

问题描述

首先，我想preface这与我缺乏了解的协调布局。我只是下面的教程我在网上发现，很好奇，为什么我的行为是行不通的。

Firstly, I'd like to preface this with my lack of knowledge about the coordinator layout. I'm merely following tutorials I found online and am curious why my behavior isn't working.

请问子视图的协调布局中必须应用栏布局？ 或者，你可以把任何观点在里面。

Does the child view inside of coordinator layout have to be app bar layout? Or are you able to put any view inside there.

此外，当我定义RES-自动命名它不给我layout_behavior的选项。通常机器人工作室将自动完成，如果检测功能，它没有。虽然，如果我输入了layout_behavior它不会抱怨。因此，也许它的工作...？

Also, when I define the res-auto namespace it doesn't give me the option for layout_behavior. Usually android studio will auto-complete if a function is available and it didn't. Although, if I type out layout_behavior it doesn't complain. So maybe it's working...?

不管怎样，我定义自己的自定义布局行为，我试图使用它，但它似乎并不奏效。任何有识之士将大大AP preciated。

Regardless, I've defined my own custom layout behavior and am trying to apply it but it doesn't seem to be working. Any insight would be greatly appreciated.

下面是布局。我想申请我的自定义行为第一的LinearLayout（search_polls_toolbar），并把它向上滚动垂直recyclerview滚动的时候了。 （如工具栏目前一样。） 我还要提到，这个XML是在viewpager一个片段。而主办的活动连接到它的协调布局，它使工具栏向上滚动。 （因为这难道是抵触？）

Here is the layout. I'm trying to apply my custom behavior to the first LinearLayout (search_polls_toolbar) and have it scroll up when the vertical recyclerview scrolls up. (Like the toolbar currently does.) I should also mention, this xml is for a fragment in a viewpager. And the hosting activity has a coordinator layout attached to it that does make the toolbar scroll up. (Could it be conflicted because of that?)

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:id="@+id/root"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<RelativeLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <LinearLayout
        android:id="@+id/search_polls_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?android:actionBarSize"
        android:background="@color/icitizen_toolbar_orange"
        android:weightSum="1"
      app:layout_behavior="com.example.chrisjohnson.icitizenv2.CustomBehaviors.ToolbarBehavior"
        >

        <EditText
            android:id="@+id/search_polls"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:hint="@string/search_polls"
            android:gravity="center_horizontal"
            android:layout_weight=".5"
            android:drawableLeft="@drawable/magnifying_glass"
            android:drawableStart="@drawable/magnifying_glass"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="15dp"
            android:drawablePadding="-50dp"
            android:paddingLeft="5dp"
            android:paddingTop="5dp"
            android:paddingBottom="10dp"
            android:cursorVisible="false"
            android:textSize="20sp"
            android:background="@color/icitizen_light_orange"
            />

    </LinearLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/poll_horizontal_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="75dp"
        android:layout_below="@id/search_polls_toolbar"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="5dp"
        android:scrollbars="none"
        >

    </android.support.v7.widget.RecyclerView>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/poll_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="10dp"
        android:layout_below="@id/poll_horizontal_recycler_view"
        app:layout_scrollFlags="scroll|enterAlways"
        android:scrollbars="vertical" />

</RelativeLayout>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/polls_fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/white_plus_icon"
    android:layout_marginBottom="70dp"
    app:backgroundTint="@color/icitizen_orange"
    app:layout_anchor="@id/container"
    app:layout_anchorGravity="bottom|right|end"
    app:borderWidth="0dp"
    android:layout_marginRight="15dp"
    android:layout_marginEnd="15dp"/>

和这里的自定义行为：

public class ToolbarBehavior extends CoordinatorLayout.Behavior<Toolbar> {
    public ToolbarBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
        Toast.makeText(context, "AJSJA", Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, Toolbar child, View dependency) {
        return dependency instanceof RecyclerView;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, Toolbar child, View dependency) {
        child.setTranslationY(child.getY());
        return true;
    }
}

和这里的托管activies布局。

And here's the hosting activies' layout.

    <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?android:attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            />
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/home_viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />
</android.support.design.widget.CoordinatorLayout>

如果有人想我张贴了我的code，请让我知道！感谢：）

If anyone would like me to post anymore of my code, please let me know! Thanks :)

推荐答案

为什么它不工作的原因是，鉴于与行为必须是直接<$儿童C $ C> CoordinatorLayout 。你的情况，该层次是： CoordinatorLayout - > RelativeLayout的 - > 的LinearLayout （用行为）。

The reason why it is not working is that view with Behavior must be a direct child of CoordinatorLayout. In your case, the hierarchy is: CoordinatorLayout -> RelativeLayout -> LinearLayout (with Behavior).

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