将点击事件从RecyclerView发送到父ListFragment或ListAdapter

问题描述

我有一个带有某些ListItems的ListFragment.在一个ListItem中，我有一些视图以及带有CardViews的RecyclerView.在CardView中是ImageView.

I have a ListFragment with some ListItems.In one ListItem I have some Views and also a RecyclerView with CardViews.In the CardView is a ImageView.

我想使用RecyclerView包含一些图片，并且想要滚动图片.我也想用两个手指手势来缩放图片. (如果有人知道一个很好的循序渐进教程，那将是很好的).但我也想单击并长按图片.我需要在ListArrayAdapter或ListFragment中单击并长按.

I want to use the RecyclerView to have some pictures in it and I want to scroll the pictures. I also want to zoom the pictures with a two finger-gesture. (Would be nice if someone knows a good step by step tutorial therefor). But I also want to click and longclick on the pictures. I need the click and longclick in my ListArrayAdapter or in my ListFragment.

我找到了这个公认的答案来做到这一点:点击recyclerview时未触发父级点击事件

I found this accepted answer to do that:Parent click event not firing when recyclerview clicked

但是点击次数不会到达Adapter或ListFragment.而且，如果我使用LongClick多玩一点，则应用程序会崩溃，因为CardView调用performLongClick并以NullPointerException结尾:

But the clicks doesn't reach the Adapter or ListFragment. And if I play a little more with the LongClick the App crashes because the CardView calls performLongClick and this ends in a NullPointerException:

java.lang.NullPointerException:尝试调用接口方法'boolean android.view.ViewParent.showContextMenuForChild(android.view.View)'上为null 对象参考 在android.view.View.showContextMenu(View.java:6346) 在 android.view.View.performLongClickInternal(View.java:6280) 在android.view.View.performLongClick(View.java:6234)

java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.view.ViewParent.showContextMenuForChild(android.view.View)' on a null object reference at android.view.View.showContextMenu(View.java:6346) at android.view.View.performLongClickInternal(View.java:6280) at android.view.View.performLongClick(View.java:6234)

那么-我需要做更多的工作以使一切正常吗?

So - what I have to do more that everything works fine?

这是行布局-缩小了一些:

This is the rowlayout - a little bit shrinked:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="ListFragment"
    android:orientation="vertical"
    android:descendantFocusability="blocksDescendants"
    >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:gravity="left|center_vertical"
            android:layout_marginLeft="5dp"
            android:minHeight="30dp"
            android:orientation="vertical"
            android:layout_toLeftOf="@+id/icon"
            >
            <RelativeLayout
                android:id="@+id/myLayout"
                android:layout_width="match_parent"
                android:layout_height="320dp"
                android:layout_marginTop="5dp"
                android:orientation="horizontal"
                >
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/myRecyclerView"
                    android:layout_width="wrap_content"
                    android:layout_height="350dp"
                    />
            </RelativeLayout>
        </LinearLayout>
    </RelativeLayout>
</LinearLayout>

在ListAdapter中，我的myLayout-View和myRecyclerView-View有一个OnClickListener(onClick(View)).在ListFragment中，我的onListItemClick方法中也有一个断点.但是什么也没发生.

I have a OnClickListener (onClick(View)) for the myLayout-View and for the myRecyclerView-View in the ListAdapter.In the ListFragment I also have a breakpoint in my onListItemClick-method. But nothing happend.

CardView布局:

The CardView layout:

<com.package.MyCardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    card_view:cardCornerRadius="4dp"
    android:layout_margin="5dp"
    android:descendantFocusability="blocksDescendants"
    >

    <ImageView android:id="@+id/picture"
        android:src="@drawable/picture_empty"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_margin="0dp"
        android:padding="0dp"
        android:adjustViewBounds="true"
        android:visibility="invisible"
        xmlns:android="http://schemas.android.com/apk/res/android" />

</com.package.MyCardView>

您可以在上面的链接中的接受的答案中看到MyCardView的来源.调用了Initialize()，如果我在ImageView/CardView上短按，则调用了onInterceptTouchEvent()，但是它具有ACTION_DOWN事件，然后调用了onDown()和onLongPress().

The source of MyCardView you can see in the accepted answer in the link above. The Initialize() were called and if I touch short on the ImageView/CardView the onInterceptTouchEvent() were called but has an ACTION_DOWN event and then the onDown() and then the onLongPress() were called.

推荐答案

您应该发布更多代码，以便我们更好地调试此问题.我不知道您在做什么，但是通常的做法是使适配器/片段实现View.OnClickListener和View.OnLongClickListener并将其附加到ViewHolders中的适当视图上.

You should post more code to allow us to better debug this issue.I don't know what you are doing, but the usual pattern how to do this is to make your adapter/fragment implement View.OnClickListener and View.OnLongClickListener and attach that in your ViewHolders to appropriate views.

在捏放大的东西.我在 Zoomy

On the pinch to zoom thing. I have had great experience with Zoomy

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