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RecyclerView系列之三：处理item的点击事件

RecyclerView系列之三：处理item的点击事件

作者: 滴滴滴9527 | 来源:发表于2017-04-20 11:34 被阅读355次

在RecyclerView中，并没有直接提供类似setOnItemClickListener( )和setOnItemLongClickListener ( )的方法，但是我们可以自己去添加

一、方式1：条目的布局文件中添加onClick属性来实现

1、布局文件

(1)、MainActivity 布局文件

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

(2)、RecyclerViewt条目的布局文件
在根标签添加onClick属性， android:onClick="myItemClick"

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="#ff33b5e5"
    android:onClick="myItemClick"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:gravity="center"
        tools:text="别看了，我就是一个TextView" />
</RelativeLayout>
2、Activity中
public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private MainAdapter mAdapter;
    private List<String> mDatas;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
        mAdapter = new MainAdapter(this,mDatas);
        mRecyclerView.setAdapter(mAdapter);
    }

    /**
     * @param view    就是我们点击的itemView
     */
    public void myItemClick(View view){
        // 获取itemView的位置
        int position = mRecyclerView.getChildAdapterPosition(view);
        Toast.makeText(MainActivity.this, "点击了 " + mDatas.get(position),
                                            Toast.LENGTH_SHORT).show();
    }

    private void initData() {
        mDatas = new ArrayList<>();
        for (int i = 'A'; i < 'Z'; i++) {
            mDatas.add("" + (char) i);
        }
    }
}
3、Adapter
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.MyViewHolder> {

    private Context mContext;
    private List<String> mDatas;

    public MainAdapter(Context context, List<String> mDatas) {
        this.mContext = context;
        this.mDatas = mDatas;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(mContext, R.layout.item_layout, null);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.tv.setText(mDatas.get(position));
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tv;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv);
        }
    }
}
4、效果图及小结

这种方式处理item的点击事件极其简单，但是onClick属性必须在包含该组件的Activity中去实现，在Fragment里面就不行了......当然，我们可以通过反射去实现，但是这就太麻烦了

二、方式2：通过在adapter中提供回调来实现item的点击事件

1、Activity中
public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private MainAdapter mAdapter;
    private List<String> mDatas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
        mAdapter = new MainAdapter(this,mDatas);

        mAdapter.setOnItemClickLitener(new MainAdapter.OnItemClickLitener() {
            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(MainActivity.this,"这是条目"+mDatas.get(position),Toast.LENGTH_LONG).show();
            }
        });
        mRecyclerView.setAdapter(mAdapter);
    }

    private void initData() {
        mDatas = new ArrayList<>();
        for (int i = 'A'; i < 'Z'; i++) {
            mDatas.add("" + (char) i);
        }
    }
}
2、Adapter中
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.MyViewHolder> {

    private Context mContext;
    private List<String> mDatas;
    private OnItemClickLitener   mOnItemClickLitener;

//设置回调接口
    public interface OnItemClickLitener{
        void onItemClick(View view, int position);
    }

    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener){
        this.mOnItemClickLitener = mOnItemClickLitener;
    }

    public MainAdapter(Context context, List<String> mDatas) {
        this.mContext = context;
        this.mDatas = mDatas;
    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(mContext, R.layout.item_layout, null);
        return new MyViewHolder(view);
    }


    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        holder.tv.setText(mDatas.get(position));

//通过为条目设置点击事件触发回调
        if (mOnItemClickLitener != null) {
            holder.itemLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mOnItemClickLitener.onItemClick(view, position);
                }
            });
        }
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tv;
        RelativeLayout itemLayout;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv);
            itemLayout = (RelativeLayout) view.findViewById(R.id.item_layout);
        }
    }
}
3、效果图及小结

这种实现方式解决了方式一的缺陷，也是大多数人使用的方式.

三、方式3：通过RecyclerView.addOnItemTouchListener()去监听

1、RecyclerView中有一个监听触摸事件方法，该方法需要一个OnItemTouchListener 对象，我们可以通过这个方法来处理item的点击事件
public void addOnItemTouchListener(OnItemTouchListener listener) {
    mOnItemTouchListeners.add(listener);
}
2、接口OnItemTouchListener
public static interface OnItemTouchListener {

    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e);

    public void onTouchEvent(RecyclerView rv, MotionEvent e);

    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept);
}

了解Android事件分发机制的肯定对这几个方法很熟悉，第一个方法是拦截触摸事件的，第二个方法是处理触摸事件的，第三个方法是处理触摸冲突的。此接口官方提供了一个实现类SimpleOnItemTouchListener，不过没有处理什么逻辑。

3、接口OnItemTouchListener 实现类SimpleOnItemTouchListener
 public static class SimpleOnItemTouchListener implements RecyclerView.OnItemTouchListener {
        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
            return false;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        }

       @Override
       public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
       }
    }

这里我们通过继承SimpleOnItemTouchListener 来实现我们的点击事件

4、继承SimpleOnItemTouchListener
public abstract class MyItemClickListener extends RecyclerView.SimpleOnItemTouchListener {

    private GestureDetectorCompat mGestureDetectorCompat;
    private RecyclerView mRecyclerView;

    /**
     * 通过构造传入我们的RecyclerView,并初始化GestureDetectorCompat
     */
    public MyItemClickListener(RecyclerView recyclerView) {
        this.mRecyclerView = recyclerView;
        mGestureDetectorCompat = new GestureDetectorCompat(
              mRecyclerView.getContext(),new MyGestureListener());
    }

    /**
     * 将事件交给GestureDetectorCompat处理
     *   并将MotionEvent 传入GestureDetectorCompat使得可以获取触摸的坐标
     */
    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetectorCompat.onTouchEvent(e);
    }

    /**
     * 不拦截触摸事件,将事件交给GestureDetectorCompat处理
     */
    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetectorCompat.onTouchEvent(e);
        return false;
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }

    /**
     * 定义一个抽象回调方法
     */
    public abstract void onItemClick(RecyclerView.ViewHolder vh);

    private class MyGestureListener extends GestureDetector.SimpleOnGestureListener{

        /**
         * 这个方法在简单的点击屏幕时执行
         *   如果要处理长按事件可以复写onLongPress（）方法，方法内具体逻辑类似
         */
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            View childView = mRecyclerView.findChildViewUnder(e.getX(), e.getY());
            if (childView != null) {
                RecyclerView.ViewHolder viewHolder = 
                        mRecyclerView.getChildViewHolder(childView);
                onItemClick(viewHolder);//触发回调
            }
            return true;
        }
    }
}
5、Activity中
public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private MainAdapter mAdapter;
    private List<String> mDatas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
        mAdapter = new MainAdapter(this,mDatas);
        mRecyclerView.setAdapter(mAdapter);

        mRecyclerView.addOnItemTouchListener(new MyItemClickListener(mRecyclerView){
            @Override
            public void onItemClick(RecyclerView.ViewHolder viewHolder) {
                int position = viewHolder.getAdapterPosition();
                Toast.makeText(MainActivity.this, 
                         "addOnItemTouchListener点击了" + mDatas.get(position), 
                         Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void initData() {
        mDatas = new ArrayList<>();
        for (int i = 'A'; i < 'Z'; i++) {
            mDatas.add("" + (char) i);
        }
    }
}
6、效果及小结

这种实现方式在点击时可以实时获取点击时的坐标，但是使用的人不多.

四、方式4：捕获点击和长按事件的辅助类

1、自定义的条目点击事件支持类ItemClickSupport
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);
    }
}

需要在values目录下定义一个ids.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="item_click_support" type="id" />
</resources>
2、Activity中调用
ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
    @Override 
    public void onItemClicked(RecyclerView recyclerView, int position, View v) {
        Toast.makeText(MainActivity.this,"这次点击了"+mDatas.get(position),Toast.LENGTH_SHORT).show();
    }
});

使用起来是不是很简单

五、总结

以上就是几种处理RecyclerView条目点击事件的方法，如果你有更好的方法，欢迎交流.

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