在Android中使用RecyclerView创建的列表上滑动以显示操作按钮
我的应用程序的主要活动有一个自定义列表,每个列表项都应该在左扫时显示一个与其关联的操作按钮,并在同一列表项再次向右扫时隐藏该按钮。现在,我试图通过创建swipe detector类,然后将其设置为ItemHolder类中列表项的触摸侦听器,来检测每个列表项的滑动事件 但是,由于RecyclerView是可滚动的,所以在单个列表项上的滑动不会被检测到。如何检测单个列表项上的滑动 MainActivity-onCreate()在Android中使用RecyclerView创建的列表上滑动以显示操作按钮,android,android-recyclerview,swipe,Android,Android Recyclerview,Swipe,我的应用程序的主要活动有一个自定义列表,每个列表项都应该在左扫时显示一个与其关联的操作按钮,并在同一列表项再次向右扫时隐藏该按钮。现在,我试图通过创建swipe detector类,然后将其设置为ItemHolder类中列表项的触摸侦听器,来检测每个列表项的滑动事件 但是,由于RecyclerView是可滚动的,所以在单个列表项上的滑动不会被检测到。如何检测单个列表项上的滑动 MainActivity-onCreate() 滑动检测适用于除RecyclerView列表项(或任何其他可滚动视图的子
滑动检测适用于除RecyclerView列表项(或任何其他可滚动视图的子视图)之外的任何其他视图。如何检测列表项上的滑动?问题已经解决,但我不知道这是否是正确的方法,但它确实有效。事情是这样的- 使用两种方法创建一个界面SwipeActions,这两种方法将用于左右滑动的回调 开关动作
public interface SwipeActions {
public void onLeftSwipe(MotionEvent e);
public void onRightSwipe(MotionEvent e);
}
然后将SwipeAction作为SwipedTector的属性之一,然后在构造函数中将其初始化
public class SwipeDetector implements View.OnTouchListener {
static final int MIN_DISTANCE = 50;
private float downX, downY, upX, upY;
public SwipeActions swipeActions;
public SwipeDetector(SwipeActions swipeActions) {
this.swipeActions = swipeActions;
}
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
if ( Math.abs(deltaX) > MIN_DISTANCE){
if ( deltaX < 0){
swipeActions.onRightSwipe(event);
return true;
}
if ( deltaX > 0){
swipeActions.onLeftSwipe(event);
return true;
}
} else{
Log.i("Swipe Detector","Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
}
}
}
return false;
}
}
public SubjectHolder(Context context, View itemView) {
super(itemView);
this.subjectTextView = (TextView) itemView.findViewById(R.id.name);
SwipeDetector swipeDetector = new SwipeDetector();
itemView.setOnTouchListener(swipeDetector);
}
public interface SwipeActions {
public void onLeftSwipe(MotionEvent e);
public void onRightSwipe(MotionEvent e);
}
public class SwipeDetector implements View.OnTouchListener {
static final int MIN_DISTANCE = 50;
private float downX, downY, upX, upY;
public SwipeActions swipeActions;
public SwipeDetector(SwipeActions swipeActions) {
this.swipeActions = swipeActions;
}
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
if ( Math.abs(deltaX) > MIN_DISTANCE){
if ( deltaX < 0){
swipeActions.onRightSwipe(event);
return true;
}
if ( deltaX > 0){
swipeActions.onLeftSwipe(event);
return true;
}
} else{
Log.i("Swipe Detector","Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
}
}
}
return false;
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_recycler);
ArrayList<Subject> subjects = new ArrayList<>();
subjects.add(new Subject(1, "Physics"));
subjects.add(new Subject(2, "Chemistry"));
subjects.add(new Subject(3, "Biology"));
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.subject_recycler_list_view);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
SubjectRecyclerListAdapter adapter = new SubjectRecyclerListAdapter(getApplicationContext(), R.layout.row_layout , subjects);
SwipeDetector swipeDetector = new SwipeDetector(new SwipeActions() {
@Override
public void onLeftSwipe(MotionEvent evnt) {
View childView = recyclerView.findChildViewUnder(evnt.getX(), evnt.getY());
if(childView != null) {
// Perform your action on childView (Swiped List Item)
}
else {
Log.i("Main Recycler Activity", "Child View is Null");
}
}
@Override
public void onRightSwipe(MotionEvent evnt) {
View childView = recyclerView.findChildViewUnder(evnt.getX(), evnt.getY());
if(childView != null) {
if(swipedViews.contains(childView)) {
// Perform your action on childView (Swiped List Item)
}
}
else {
Log.i("Main Recycler Activity", "Child View is Null");
}
}
});
recyclerView.setOnTouchListener(swipeDetector);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(layoutManager);
}
public SubjectHolder(Context context, View itemView) {
super(itemView);
this.subjectTextView = (TextView) itemView.findViewById(R.id.name);
}