[英]ViewPager inside ListView row prevents onItemClick to be fired
我在ListView的每一行中都有一個ViewPager。 它工作正常,當用戶使用滑動手勢時,它會更改其中的視圖,但它會阻止調用ListView的onItemClick方法。 我知道ViewPager是罪魁禍首,因為當我隱藏它時,會調用onItemClick,所以這就是我想要的:
我創建了一個ViewGroup作為行(RowView)。 此ViewGroup具有onInterceptTouchEvent
覆蓋,以避免ViewPager在檢測到單擊時處理更多觸摸事件。 但仍未調用onItemClick回調。 並且列表選擇器不會在單擊時顯示。 我想要這兩個功能。
這是RowView的onInterceptTouchEvent的樣子:
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
int actionMasked = ev.getActionMasked();
switch(actionMasked) {
case MotionEvent.ACTION_DOWN:
Log.d("RowView", "OnInterceptTouchEvent - Down");
tapDetector.onTouchEvent(ev);
return false;
case MotionEvent.ACTION_CANCEL:
Log.d("RowView", "OnInterceptTouchEvent - Cancel");
tapDetector.onTouchEvent(ev);
break;
case MotionEvent.ACTION_UP:
if(tapDetector.onTouchEvent(ev)) {
Log.d("RowView", "OnInterceptTouchEvent - UP!");
return true;
}
break;
}
return super.onInterceptTouchEvent(ev);
}
有什么建議可以解決嗎?
編輯 :關於如何在ViewPager處於活動狀態時未調用MainActivity中的onItemClick的示例(Lollipop列表選擇器也未出現)
主要活動
ListView listView = (ListView) findViewById(R.id.main_list);
listView.setAdapter(new MainListAdapter(this, 30));
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "onItemClick: " + position);
}
});
列表項XML:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="80dp"
android:descendantFocusability="blocksDescendants"
>
<TextView
android:id="@+id/row_num"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
/>
<android.support.v4.view.ViewPager
android:id="@+id/row_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible"
/>
</RelativeLayout>
列表適配器:
public class MainListAdapter extends BaseAdapter {
private Context context;
private LayoutInflater inflater;
private int count;
public MainListAdapter(Context context, int count) {
this.context = context;
this.inflater = LayoutInflater.from(context);
this.count = count;
}
@Override
public int getCount() {
return count;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null) {
holder = new ViewHolder();
convertView = createRow(parent, holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(Integer.toString(position));
int randomPages = (int) (new Random().nextDouble()*5+2);
holder.viewPager.setAdapter(new NumAdapter(context, randomPages));
return convertView;
}
private View createRow(ViewGroup parent, ViewHolder holder) {
View view = inflater.inflate(R.layout.row_main_listview, parent, false);
holder.textView = (TextView) view.findViewById(R.id.row_num);
holder.viewPager = (ViewPager) view.findViewById(R.id.row_viewpager);
view.setTag(holder);
return view;
}
private static class ViewHolder {
public TextView textView;
public ViewPager viewPager;
}
}
ViewPager的適配器:
public class NumAdapter extends PagerAdapter {
private LayoutInflater inflater;
private int count;
public NumAdapter(Context context, int count) {
this.inflater = LayoutInflater.from(context);
this.count = count;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
TextView textView = (TextView) inflater.inflate(R.layout.page_viewpager, container, false);
textView.setText("Page " + position);
container.addView(textView);
return textView;
}
@Override
public int getCount() {
return count;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View)object);
}
}
我認為更好的覆蓋列表視圖onintercepter而不是viewgroup。
TouchEvent Flow簡單地說:
活動觸摸事件 - > viewgroup.dispatchtouchevent - > viewgroup.intercepter ..-> view.dispatchtouch ... - > .....
在這種情況下list.dispatch調用。 將事件ViewPager.dispatch
。 但在ViewPager.dispatchtouchevent
之前,調用ListView.intercepterTouchEvent
。
如果dispatchTouchEvent
返回false
調用parent View
的TouchEvent
但返回true
call flow descent。
如果intercepterTouchEvent
返回true
則不調用子dispatchTouchEvent
但返回false
調用子dispatchTouchEvent
。 所以listview.intercepterTouchEvent
返回true
,調用o nItemClick
。
所以如果listView.intercepterTouchEvent
返回true
,則不刷過viewPager
項。
您可以了解用戶的操作滑動或單擊2方式。 TouchEvent
和guesturedetector
..
在listview的IntercepterTouchEvent(Event ev);
VelocityTracker mVelocityTracker;
PointF mLastPoint;
public mListView(Context context) {
super(context);
init();
}
public mListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public mListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
mLastPoint = new PointF();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(mVelocityTracker == null)
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(ev);
switch (ev.getAction()){
case MotionEvent.ACTION_MOVE:
mVelocityTracker.computeCurrentVelocity(100);
int x = (int)Math.abs(mVelocityTracker.getXVelocity());
int move_x = (int)Math.abs(ev.getX() - mLastPoint.x);
Log.d("ListView","speed : " + x +" move_x : " + move_x);
//here x is drag speed. (pixel/s)
// change value left right both value you want speed and move amount
if(move_x < 100 || x <100) {
mLastPoint.set(ev.getX(), ev.getY());
return true;
}
break;
case MotionEvent.ACTION_DOWN:
mLastPoint.set(ev.getX(), ev.getY());
break;
case MotionEvent.ACTION_UP:
mVelocityTracker.recycle();mVelocityTracker = null;
break;
}
return super.onInterceptTouchEvent(ev);
}
你可以刷速度約100或移動量100像素。 如果沒有執行點擊事件。
我希望這篇文章可以幫助你......
並添加編輯一些代碼打擊。
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(mVelocityTracker == null)
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(ev);
switch (ev.getAction()){
case MotionEvent.ACTION_MOVE:
mVelocityTracker.computeCurrentVelocity(10);
int x = (int)Math.abs(mVelocityTracker.getXVelocity());
int move_x = (int)Math.abs(ev.getX() - mLastPoint.x);
int move_y = (int)Math.abs(ev.getY() - mLastPoint.y);
Log.d("ListView","speed : " + x +" move_x : " + move_x + " move_y : "+ move_y);
if(move_x < move_y || x < 10) {
mLastPoint.set(ev.getX(), ev.getY());
return true;
}else if(move_x > move_y){
return false;
}
break;
case MotionEvent.ACTION_DOWN:
mLastPoint.set(ev.getX(), ev.getY());
break;
case MotionEvent.ACTION_UP:
break;
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
Log.d("ListView", "dispatch");
switch (ev.getAction()){
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
if(mVelocityTracker != null){mVelocityTracker.recycle();mVelocityTracker = null;}
break;
}
return super.dispatchTouchEvent(ev);;
}
由於您的視圖是listview的孩子,它會消耗觸摸事件。 你可以通過讓你的觀看者孩子不可點擊來防止這種情況,即
TextView textView =(TextView)inflater.inflate(R.layout.page_viewpager,container, false);
textView.setText("Page " + position);
textView.setClickable(false);
我建議在每個ViewPager
實例本身上設置OnClickListener
,並避免使用ListView的onItemClickListener
。 然后,您也可以完全刪除onInterceptTouchEvent()
。 那將是最簡單和穩定的解決方案。 更少的代碼 - 更少的錯誤;)
您需要執行以下操作之一:
在Viewpager
的子setOnClickListener
上設置setOnClickListener
或查找
android:descendantFocusability="beforeDescendants"
我希望這可以幫到你。
我認為這應該可以解決問題。
viewPager.getParent().requestDisallowInterceptTouchEvent(false);
我希望這能幫到您。
我們的想法是在視圖尋呼機而不是listView上進行點擊監聽
在getView方法中添加viewPager時,將其標記設置為行的位置
holder.viewPager.setTag(position);
然后將click監聽器添加到viewPager(也在getView中)
viewPager.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
int position = v.getTag();
Log.d(TAG, "onItemClick: " + position);
//Fire a delegate or notification of whatever you want to do on the item click. You now have the position
myClickListener.onItemClicked(position);
}
});
問題出在列表適配器視圖中。 當我嘗試實現相同的功能(listview在listview行中)時,我遇到了類似的問題。 我通過這樣做解決了----在viewholder對象上設置onclicklistener而不是直接在listview上設置。 為此,您必須在適配器類上實現onitemclicklistener。
對阿德里安答案的改進:
public class CustomListView extends ListView {
private GestureDetector gestureDetector;
public CustomListView(Context context) {
super(context);
gestureDetector = new GestureDetector(context, new CustomListViewOnGestureListener());
}
public CustomListView(Context context, AttributeSet attrs) {
super(context, attrs);
gestureDetector = new GestureDetector(context, new CustomListViewOnGestureListener());
}
public CustomListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
gestureDetector = new GestureDetector(context, new CustomListViewOnGestureListener());
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CustomListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
gestureDetector = new GestureDetector(context, new CustomListViewOnGestureListener());
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
gestureDetector.onTouchEvent(ev);
return super.dispatchTouchEvent(ev);
}
private class CustomListViewOnGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onSingleTapUp(MotionEvent ev) {
int firstVisiblePosition = getFirstVisiblePosition();
int itemPosition = pointToPosition((int) ev.getX(), (int) ev.getY());
int childIndex = itemPosition - firstVisiblePosition;
View view = getChildAt(childIndex);
performItemClick(view, itemPosition, getItemIdAtPosition(itemPosition));
return true;
}
}
}
雖然列表選擇器不起作用,但這是我最終要做的事情。 這可以改進,但是,就目前而言,它是我喜歡它的唯一工作方式。
public class CustomListView extends ListView implements AbsListView.OnScrollListener {
/*
* Used for detect taps
*/
private GestureDetector tapDetector;
/*
* As we need to set our own OnScrollListener, this stores the one
* used outside, if any
*/
private OnScrollListener onScrollListener;
private boolean isScrolling = false;
public CustomListView(Context context) {
super(context);
initView(context);
}
public CustomListView(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public CustomListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CustomListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
initView(context);
}
private void initView(Context context) {
tapDetector = new GestureDetector(context, new TapListener());
super.setOnScrollListener(this);
}
@Override
public void setOnScrollListener(OnScrollListener onScrollListener) {
this.onScrollListener = onScrollListener;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
boolean isTap = tapDetector.onTouchEvent(ev);
if(ev.getActionMasked() == MotionEvent.ACTION_UP) {
// Don't perform the click if the ListView is scrolling
// so it is able to stop the scroll
if(isTap && !isScrolling && hasOnItemClickListener()) {
int itemPosition = pointToPosition((int)ev.getX(), (int)ev.getY());
performItemClick(this, itemPosition, getItemIdAtPosition(itemPosition));
}
}
return super.dispatchTouchEvent(ev);
}
public boolean hasOnItemClickListener() {
return getOnItemClickListener() != null;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
isScrolling = scrollState != OnScrollListener.SCROLL_STATE_IDLE;
if(this.onScrollListener != null) {
onScrollListener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if(this.onScrollListener != null) {
onScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
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