我在 ListView 的每一行中都有一个 ViewPager。它工作正常,当用户使用滑动手势时它会更改其中的 View ,但它会阻止调用 ListView 的 onItemClick 方法。我知道 ViewPager 是罪魁祸首,因为当我隐藏它时,会调用 onItemClick,所以这就是我正在尝试的:
我创建了一个 ViewGroup 作为行 (RowView)。此 ViewGroup 已覆盖 onInterceptTouchEvent
以避免 ViewPager 在我检测到点击时处理进一步的触摸事件。但是 onItemClick 回调仍然没有被调用。并且列表选择器不会在点击时显示。我希望这两个功能起作用。
这是来自 RowView 的 onInterceptTouchEvent 的样子:
@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);
}
有什么解决这个问题的建议吗?
编辑:有关当 ViewPager 处于 Activity 状态时如何不调用 MainActivity 中的 onItemClick 的无效示例(Lollipop 列表选择器也未出现)
MainActivity
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);
}
});
List item 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>
List adapter:
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's Adapter:
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);
}
}
最佳答案
我认为重写 listview onintercepter 比重写 viewgroup 更好。
简单的 TouchEvent 流程:
Acitivity触摸事件->viewgroup.dispatchtouchevent->viewgroup.intercepter..->view.dispatchtouch...->.....
在本例中是 list.dispatch 调用。将事件抛给 ViewPager.dispatch
。但在 ViewPager.dispatchtouchevent
之前,调用 ListView.intercepterTouchEvent
。
如果 dispatchTouchEvent
返回 false
调用父 View
的 TouchEvent
但返回 true
调用流程下降。
如果 intercepterTouchEvent
返回 true
不调用子 dispatchTouchEvent
但返回 false
调用子 dispatchTouchEvent
。
所以 listview.intercepterTouchEvent
返回 true
,调用 onItemClick
。
因此,如果 listView.intercepterTouchEvent
返回 true
,则不会滑动 viewPager
项。
您可以通过 2 种方式了解用户的 Action 滑动或点击。
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);
}
您可以滑动速度大约 100 或移动量 100 像素。如果不执行点击事件。
希望这篇文字能帮到你......
并添加编辑一些代码。
@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);;
}
关于android - ListView 行内的 ViewPager 阻止触发 onItemClick,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29622098/