RecyclerView系列之三：处理item的点击事件
2017-04-20 本文已影响355人
滴滴滴9527
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.
