[英]Handle Button click inside a row in RecyclerView
我正在使用以下代碼來處理行點擊。 ( 來源 )
static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
}
但是,如果我想在每一行上說一個刪除按鈕,這是有效的。 我不確定如何實現這一點。
我附加了OnClick監聽器來刪除工作的按鈕(刪除行),但它也會觸發整行上的onclick。
如果單擊一個按鈕,任何人都可以幫助我避免完全行單擊。
謝謝。
這就是我在recyclelerView中處理多個onClick事件的方法:
編輯:已更新以包含回調(如其他注釋中所述)。 我在ViewHolder
使用了WeakReference
來消除潛在的內存泄漏。
定義界面:
public interface ClickListener {
void onPositionClicked(int position);
void onLongClicked(int position);
}
那么適配器:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private final ClickListener listener;
private final List<MyItems> itemsList;
public MyAdapter(List<MyItems> itemsList, ClickListener listener) {
this.listener = listener;
this.itemsList = itemsList;
}
@Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new MyViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.my_row_layout), parent, false), listener);
}
@Override public void onBindViewHolder(MyViewHolder holder, int position) {
// bind layout and data etc..
}
@Override public int getItemCount() {
return itemsList.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
private ImageView iconImageView;
private TextView iconTextView;
private WeakReference<ClickListener> listenerRef;
public MyViewHolder(final View itemView, ClickListener listener) {
super(itemView);
listenerRef = new WeakReference<>(listener);
iconImageView = (ImageView) itemView.findViewById(R.id.myRecyclerImageView);
iconTextView = (TextView) itemView.findViewById(R.id.myRecyclerTextView);
itemView.setOnClickListener(this);
iconTextView.setOnClickListener(this);
iconImageView.setOnLongClickListener(this);
}
// onClick Listener for view
@Override
public void onClick(View v) {
if (v.getId() == iconTextView.getId()) {
Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
listenerRef.get().onPositionClicked(getAdapterPosition());
}
//onLongClickListener for view
@Override
public boolean onLongClick(View v) {
final AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
builder.setTitle("Hello Dialog")
.setMessage("LONG CLICK DIALOG WINDOW FOR ICON " + String.valueOf(getAdapterPosition()))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.create().show();
listenerRef.get().onLongClicked(getAdapterPosition());
return true;
}
}
}
然后在你的活動/片段中 - 你可以實現的任何東西: Clicklistener
- 或匿名類,如果你願意的話:
MyAdapter adapter = new MyAdapter(myItems, new ClickListener() {
@Override public void onPositionClicked(int position) {
// callback performed on click
}
@Override public void onLongClicked(int position) {
// callback performed on click
}
});
要獲取單擊的項目,您將匹配視圖ID ievgetId()== whateverItem.getId()
希望這種方法有幫助!
我發現通常:
所以@mark-keen的答案效果很好但是有一個界面提供了更多的靈活性:
public static class MyViewHolder extends RecyclerView.ViewHolder {
public ImageView iconImageView;
public TextView iconTextView;
public MyViewHolder(final View itemView) {
super(itemView);
iconImageView = (ImageView) itemView.findViewById(R.id.myRecyclerImageView);
iconTextView = (TextView) itemView.findViewById(R.id.myRecyclerTextView);
iconTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onClickListener.iconTextViewOnClick(v, getAdapterPosition());
}
});
iconImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onClickListener.iconImageViewOnClick(v, getAdapterPosition());
}
});
}
}
在適配器中定義onClickListener的位置:
public MyAdapterListener onClickListener;
public interface MyAdapterListener {
void iconTextViewOnClick(View v, int position);
void iconImageViewOnClick(View v, int position);
}
並且可能通過構造函數設置:
public MyAdapter(ArrayList<MyListItems> newRows, MyAdapterListener listener) {
rows = newRows;
onClickListener = listener;
}
然后,您可以處理Activity中的事件或使用RecyclerView的任何位置:
mAdapter = new MyAdapter(mRows, new MyAdapter.MyAdapterListener() {
@Override
public void iconTextViewOnClick(View v, int position) {
Log.d(TAG, "iconTextViewOnClick at position "+position);
}
@Override
public void iconImageViewOnClick(View v, int position) {
Log.d(TAG, "iconImageViewOnClick at position "+position);
}
});
mRecycler.setAdapter(mAdapter);
我想要一個沒有創建任何額外對象(即監聽器)的解決方案,這些對象必須在以后進行垃圾收集,並且不需要在適配器類中嵌套視圖持有者。
在ViewHolder
類中
private static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private final TextView ....// declare the fields in your view
private ClickHandler ClickHandler;
public MyHolder(final View itemView) {
super(itemView);
nameField = (TextView) itemView.findViewById(R.id.name);
//find other fields here...
Button myButton = (Button) itemView.findViewById(R.id.my_button);
myButton.setOnClickListener(this);
}
...
@Override
public void onClick(final View view) {
if (clickHandler != null) {
clickHandler.onMyButtonClicked(getAdapterPosition());
}
}
注意事項: ClickHandler
接口已定義,但未在此處初始化,因此onClick
方法中沒有假設它已初始化。
ClickHandler
界面如下所示:
private interface ClickHandler {
void onMyButtonClicked(final int position);
}
在適配器中,在構造函數中設置一個'ClickHandler'實例,並覆蓋onBindViewHolder
,以在視圖持有者上初始化`clickHandler':
private class MyAdapter extends ...{
private final ClickHandler clickHandler;
public MyAdapter(final ClickHandler clickHandler) {
super(...);
this.clickHandler = clickHandler;
}
@Override
public void onBindViewHolder(final MyViewHolder viewHolder, final int position) {
super.onBindViewHolder(viewHolder, position);
viewHolder.clickHandler = this.clickHandler;
}
注意:我知道viewHolder.clickHandler可能會使用完全相同的值多次設置,但這比檢查null和分支更便宜,而且沒有內存開銷,只需要額外的指令。
最后,在創建適配器時,您必須將ClickHandler
實例傳遞給構造函數,如下所示:
adapter = new MyAdapter(new ClickHandler() {
@Override
public void onMyButtonClicked(final int position) {
final MyModel model = adapter.getItem(position);
//do something with the model where the button was clicked
}
});
請注意, adapter
在此處是成員變量,而不是局部變量
如果您已經擁有一個回收器觸摸偵聽器並想要處理其中的所有觸摸事件而不是在視圖持有者中單獨處理按鈕觸摸事件,那么只是想添加另一個解決方案。 這個改編版本的關鍵是在點擊時返回onItemClick()回調中的按鈕視圖,而不是項容器。 然后,您可以測試作為按鈕的視圖,並執行不同的操作。 請注意,長按此按鈕會被解釋為長按整個行。
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener
{
public static interface OnItemClickListener
{
public void onItemClick(View view, int position);
public void onItemLongClick(View view, int position);
}
private OnItemClickListener mListener;
private GestureDetector mGestureDetector;
public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener)
{
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener()
{
@Override
public boolean onSingleTapUp(MotionEvent e)
{
// Important: x and y are translated coordinates here
final ViewGroup childViewGroup = (ViewGroup) recyclerView.findChildViewUnder(e.getX(), e.getY());
if (childViewGroup != null && mListener != null) {
final List<View> viewHierarchy = new ArrayList<View>();
// Important: x and y are raw screen coordinates here
getViewHierarchyUnderChild(childViewGroup, e.getRawX(), e.getRawY(), viewHierarchy);
View touchedView = childViewGroup;
if (viewHierarchy.size() > 0) {
touchedView = viewHierarchy.get(0);
}
mListener.onItemClick(touchedView, recyclerView.getChildPosition(childViewGroup));
return true;
}
return false;
}
@Override
public void onLongPress(MotionEvent e)
{
View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());
if(childView != null && mListener != null)
{
mListener.onItemLongClick(childView, recyclerView.getChildPosition(childView));
}
}
});
}
public void getViewHierarchyUnderChild(ViewGroup root, float x, float y, List<View> viewHierarchy) {
int[] location = new int[2];
final int childCount = root.getChildCount();
for (int i = 0; i < childCount; ++i) {
final View child = root.getChildAt(i);
child.getLocationOnScreen(location);
final int childLeft = location[0], childRight = childLeft + child.getWidth();
final int childTop = location[1], childBottom = childTop + child.getHeight();
if (child.isShown() && x >= childLeft && x <= childRight && y >= childTop && y <= childBottom) {
viewHierarchy.add(0, child);
}
if (child instanceof ViewGroup) {
getViewHierarchyUnderChild((ViewGroup) child, x, y, viewHierarchy);
}
}
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e)
{
mGestureDetector.onTouchEvent(e);
return false;
}
@Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent){}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
然后從activity / fragment中使用它:
recyclerView.addOnItemTouchListener(createItemClickListener(recyclerView));
public RecyclerItemClickListener createItemClickListener(final RecyclerView recyclerView) {
return new RecyclerItemClickListener (context, recyclerView, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
if (view instanceof AppCompatButton) {
// ... tapped on the button, so go do something
} else {
// ... tapped on the item container (row), so do something different
}
}
@Override
public void onItemLongClick(View view, int position) {
}
});
}
處理單擊事件時,需要在onInterceptTouchEvent()
內返回true。
您可以先檢查是否有任何類似的條目,如果您獲得大小為0的集合,則啟動要保存的新查詢。
要么
更專業,更快捷的方式。 創建雲觸發器(保存前)
只需放置一個名為getItemId的覆蓋方法,右鍵單擊> generate> override methods> getItemId將此方法放入Adapter類中
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