Question

我有一个RecyclerView适配器。我还有其他RecyclerView适配器，点击它们没有任何问题。但是，当我单击其中一个RecyclerView项时，toast消息不会显示。为什么呢？

public class AttendanceAdapter extends RecyclerView.Adapter {
    //...
    //other overridden factory methods of RecyclerView Adapter and //Constructors  and data setting Methods 
    //...

    public class AttendanceListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView rollNo, name;
        ImageView isPreset;

        public AttendanceListViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);

            // ...
            // Layout Items initialization
            // ...
        }

        @Override
        public void onClick(View v) {
            Toast.makeText(mContext,"reyclerViewClicked",Toast.LENGTH_LONG).show();
        }
    }
}

编辑：

我的itemView XML看起来像这样..

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp"
    android:orientation="horizontal">
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="10"
        android:padding="5dp">

        <TextView
            android:id="@+id/roll_no_in_attendance_single_item"

            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:layout_weight="2"
            android:textColor="@color/colorTeal"
            android:textSize="18sp"
            android:gravity="center"
            android:fontFamily="sans-serif-condensed"
            android:text="1" />


        <TextView
            android:id="@+id/name_in_attendance_single_item"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:layout_weight="6"
            android:textColor="@color/colorTeal"
            android:textSize="18sp"
            android:gravity="center"
            android:fontFamily="sans-serif-condensed"
            android:text="1" />


        <ImageView
            android:layout_margin="10dp"
            android:id="@+id/present_or_absent_toggle_in_attendance_single_item"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_check_circle_black_24dp"
            android:tint="@color/colorTeal"
            android:layout_weight="2"

            android:text="1" />

    </LinearLayout>
</ScrollView>


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

Answer 1

解决：我在每个项目中使用ScrollView犯了一个错误（不知不觉），

不得使用Scroll View进入

RecyclerView

项目，因为

RecyclerView 自己滚动。

Answer 2

尝试通过以下方法实现为RecyclerView项目点击创建实用程序类。

public class ItemClickSupport {

    private final RecyclerView mRecyclerView;

    private OnItemClickListener mOnItemClickListener;

    private OnItemLongClickListener mOnItemLongClickListener;

    private View.OnClickListener mOnClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mOnItemClickListener != null) {
                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
                mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
            }
        }
    };
    private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            if (mOnItemLongClickListener != null) {
                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
                return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
            }
            return false;
        }
    };
    private RecyclerView.OnChildAttachStateChangeListener mAttachListener
            = new RecyclerView.OnChildAttachStateChangeListener() {
        @Override
        public void onChildViewAttachedToWindow(View view) {
            if (mOnItemClickListener != null) {
                view.setOnClickListener(mOnClickListener);
            }
            if (mOnItemLongClickListener != null) {
                view.setOnLongClickListener(mOnLongClickListener);
            }
        }

        @Override
        public void onChildViewDetachedFromWindow(View view) {

        }
    };

    private ItemClickSupport(RecyclerView recyclerView) {
        mRecyclerView = recyclerView;
        mRecyclerView.setTag(R.id.item_click_support, this);
        mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
    }

    public static ItemClickSupport addTo(RecyclerView view) {
        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
        if (support == null) {
            support = new ItemClickSupport(view);
        }
        return support;
    }

    public static ItemClickSupport removeFrom(RecyclerView view) {
        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
        if (support != null) {
            support.detach(view);
        }
        return support;
    }

    public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
        mOnItemClickListener = listener;
        return this;
    }

    public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
        mOnItemLongClickListener = listener;
        return this;
    }

    private void detach(RecyclerView view) {
        view.removeOnChildAttachStateChangeListener(mAttachListener);
        view.setTag(R.id.item_click_support, null);
    }

    public interface OnItemClickListener {

        void onItemClicked(RecyclerView recyclerView, int position, View v);
    }

    public interface OnItemLongClickListener {

        boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
    }
}

在activity或fragment。

中使用此类似内容

ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
    @Override
    public void onItemClicked(RecyclerView recyclerView, int position, View v) {
        // your code here
        Toast.makeText(mContext,"reyclerViewClicked",Toast.LENGTH_LONG).show();
    }
});

如此blog所示。

Answer 3

假设您有item_view.xml个文件。您的主要布局是LinearLayout。只需为其定义 id 即可。

public class AttendanceListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    LinearLayout rootView;
    TextView rollNo, name;
    ImageView isPreset;

    public AttendanceListViewHolder(View itemView) {
        super(itemView);
        rootView = (LinearLayout)itemView.findViewById(R.id.root_view);
        rootView.setClickable(true);
        rootView.setOnClickListener(this);

        // ...
        // Layout Items initialization
        // ...
    }

    @Override
    public void onClick(View v) {
        Toast.makeText(mContext,"reyclerViewClicked",Toast.LENGTH_LONG).show();
    }
}

RecyclerView未被点击

3 个答案: