Develop Reference

Android tab behavior

I am designing tab view like feature, but i need one more functionality.
Suppose i have three tabs,
And if press tab2 - Content of second tab will show
tab3 -- Content of Third will show
tab1 - content of tab1 will show
and by default tab1 will be selected. and this is working fine.
Now, i need when i am scrooling the content of tab1, i need to show cotent of second tab too ( But second tab should be selected).. Just like single page application on web..
I don't need Web view. Anybody guide me how to achieve this, or if there is any sample code available on github. Please
Thanks

#AnkitaKashyap sorry mate, I kept forgot, here is your snippet code (in kotlin) if you need help, pls send me a private msg,if i got your idea correctly, here is what you want gif demo:
using a tabbar with recyclerview and set addOnTabSelectedListener:
productTabs.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener{
override fun onTabReselected(tab: TabLayout.Tab?) {
}
override fun onTabUnselected(tab: TabLayout.Tab?) {
}
override fun onTabSelected(tab: TabLayout.Tab?) {
productRv.scrollToPosition(tab?.position?:0)
}
})
and set in your recyclerview :
productRv.addOnScrollListener(object : RecyclerView.OnScrollListener(){
override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
var scrollPosition = layoutManager.findFirstVisibleItemPosition()
productTabs.getTabAt(scrollPosition)?.select()
}
override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
}
})

You need to go with VerticalViewPager as shown in this StackOverflow post and use TabLayout along with it.
Code from the given SO link:
/**
* Uses a combination of a PageTransformer and swapping X & Y coordinates
* of touch events to create the illusion of a vertically scrolling ViewPager.
*
* Requires API 11+
*
*/
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
#Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}

Scrolling behaviour: HorizontalScrollView inside ViewPager

I have a View Pager (VP) which contains a Horizontal Scroll View (HSV). If the HSV reaches one of its edges or is not able to scroll at all, on a new swipe in the blocked direction VP should take over scrolling to the next page. I hesitated to ask this question because I found similar ones like these:
Can I use Horizontal Scrollview Inside a Viewpager in Android?
or
horizontalscrollview inside viewpager
But the solution did not work for me. 'v instanceof HorizontalScrollView' gets true but viewPager does not scroll
Any other ideas how to achieve the desired behaviour?
public class MyViewPager extends ViewPager {
public MyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
// Update 1
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return true;
//return super.onInterceptTouchEvent(ev);
}
/**
* https://stackoverflow.com/questions/22781496/can-i-use-horizontal-scrollview-inside-a-viewpager-in-android
*/
#Override
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
if (v instanceof HorizontalScrollView) {
return true;
}
return super.canScroll(v, checkV, dx, x, y);
}
}
child view: view_pager_page.xml:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<include layout="#layout/" />
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
</FrameLayout>
</RelativeLayout>
parent view: view_pager.xml
<android.support.design.widget.CoordinatorLayout>
...
<LinearLayout>
<packagepath.MyViewPager
android:layout_width="match_parent"
android:layout_height="wrap_content">
</packagepath.MyViewPager>
</LinearLayout>
...
<android.support.design.widget.CoordinatorLayout>
Update 1: When overriding 'onInterceptTouchEvent' and let it always return true VP scrolls, but HSV doesn't. I think this must return true only if HSV reaches edges right? How can I figure out in this method if it is the case?
Update 2: I reconstructed the touch event mechanism of android hoping to get some insight of how to intercept the motion event flow. E.g. in HSV I can simply return false to let VP consume this and all subsequent motion events. Unfortunately I need two motion events of type MotionEvent.MOVE to decide if HSV or VP should scroll when reaching an edge (if HSV has reached right edge, a right swipe scrolls HSV back and a left swipe scrolls to next page of VP). But if I skip the MotionEvent.DOWN action neither HSV or VP starts scrolling... so hard to solve. Any ideas?
Touchevent Mechanism in Android
(Warning: Graphic is not complete and will contain mistakes, everyone is invited to correct it :-))
Update 3: Finally I got it working. Understanding the Touchevent mechanism helped a lot and also the first comment of ZeroOne. I will post my solution when I have time for it.

I solved this with a custom HorizontalScrollView. The key is to override the onTouchEvent() method and return false if you are at the left edge and swiping right, or the right edge and swiping left. Returning false means this view didn't consume the touch event and this event can bubble back up the view hierarchy to be handled by the ViewPager.
public class HorizontalScrollViewForViewPager extends HorizontalScrollView {
float old_x, old_y;
public HorizontalScrollViewForViewPager(Context context) {
super(context);
}
public HorizontalScrollViewForViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
public HorizontalScrollViewForViewPager(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
int action = ev.getActionMasked();
if (action == MotionEvent.ACTION_DOWN) {
//Start of touch. Could be tap, could be drag.
old_x = ev.getX();
old_y = ev.getY();
} else if (action == MotionEvent.ACTION_MOVE) {
//Drag movement underway
float deltaX = ev.getX() - old_x;
float deltaY = ev.getY() - old_y;
if (Math.abs(deltaX) > Math.abs(deltaY)) {
//scrolling more left/right than up/down
if (deltaX > 0 && getScrollX() == 0) {
//dragging left, at left edge of HorizontalScrollView. Don't handle this touch event, let it bubble up to ViewPager
return false;
} else {
//dragging right. Use first child to determine width of content inside HorizontalScrollView
int childWidth = getChildAt(0).getWidth();
if (deltaX < 0 && (this.getScrollX() + this.getWidth()) >= childWidth) {
//swiping left, and at right edge of HorizontalScrollView. Don't handle this touch event, let it bubble up to ViewPager
return false;
}
}
}
}
return super.onTouchEvent(ev);
}
}

1.Extend ViewPager Class:
public class ViewPagerContainingHorizontalScrollView extends ViewPager {
private Float x_old;
private boolean bDoIntercept = false;
private boolean bHsvRightEdge = false;
private boolean bHsvLeftEdge = true;
public ViewPagerContainingHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
private float calculateDistanceSwipe(MotionEvent ev){
float distance = 0;
if (x_old == null) {
x_old = ev.getX();
} else {
distance = ev.getX() - x_old;
x_old = null;
}
return distance;
}
#Override
public boolean dispatchTouchEvent(MotionEvent ev) {
mDoIntercept = false;
if(ev.getAction() == MotionEvent.ACTION_MOVE) {
float distance = calculateDistanceSwipe(ev);
if (distance < 0) {//scrolling left direction
if (bHsvRightEdge) { //HSV right edge
bDoIntercept = true;
//When scrolling slow VP may not switch page.
//Then HSV snaps back into old position.
//To allow HSV to scroll into non blocked direction set following to false.
bHsvRightEdge = false;
}
bHsvLeftEdge = false;//scrolling left means left edge not reached
} else if (distance > 0) {//scrolling right direction
if (bHsvLeftEdge) { //HSV left edge
bDoIntercept = true;
//When scrolling slow VP may not switch page.
//Then HSV snaps back into old position.
//To allow HSV to scroll into non blocked direction set following to false.
bHsvLeftEdge = false;
}
bHsvRightEdge = false;//scrolling right means right edge not reached
}
}
return super.dispatchTouchEvent(ev);
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(bDoIntercept){
return true;
}else{
return super.onInterceptTouchEvent(ev);
}
}
#Override
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
if (v instanceof HorizontalScrollView) {
HorizontalScrollView hsv = (HorizontalScrollView) v;
int max_scrollX = hsv.getChildAt(0).getWidth() - hsv.getWidth();
int min_scrollX = 0;
int current_scroll_x = hsv.getScrollX();
if (current_scroll_x == max_scrollX) { //HSV right edge
bHsvRightEdge = true;
}
if (current_scroll_x == min_scrollX) { //HSV left edge
bHsvLeftEdge = true;
}
return true;
}
return super.canScroll(v, checkV, dx, x, y);
}
}
Use this custom VP in XML.
Enjoy nested HSV scrolling in VP :-)
Touch Event Mechanism Overview for this specific case

How to make cardView slide up and down animation in android?

I am building an android application similar to inshorts. I wanna to slide my cardView up and down. What I am doing yet - I am parsing the data from server using webAPI then using BaseAdapter displaying in cardView. But now I need on swipe up it should move up and next position card should be displayed .

You can do this with ViewPager and Fragments then you need to put slide animation with view pager. For horizontal slide you can see developers reference http://developer.android.com/training/animation/screen-slide.html.
After that you need to modify view pager slightly so that it behave like vertical instead of horizontal and you can achieve this with below code:
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.75f;
#Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0]
// Use the default slide transition when moving to the left page
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
view.setScaleX(1);
view.setScaleY(1);
} else if (position <= 1) { // [0,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
// Scale the page down (between MIN_SCALE and 1)
float scaleFactor = MIN_SCALE
+ (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}

One way you can do this is by using fragments and ViewPager to load the pages, and you can specify Property Animation to animate the fragments.
If you are new to fragments, try beginning from here
And then you need ViewPager to swipe between pages. here
Property Animation is often used to animate native fragments(Android.App.Fragment) . see this
and see this to swap fragments using Animation

Implement feature like iOS app closing vertical Swipe-to-Dismiss with ViewPager

I currently have Views lined up horizontally in a ViewPager and can cycle through them with a PagerAdapter. Currently, to perform the action that I would like to do on swipe, I have to do a double-tap on the View's page. I could post code, but it's somewhat difficult to extract the necessary pieces...
What I would like is the ability to swipe vertically on these views, have them translate vertically with swipe and fade-out, and then perform an action when they reach a certain distance away from the edge of the device.
To get an idea of what I am thinking, in the Gallery app you can pinch an opened photo to zoom-out and open a horizontal filmstrip view. From there you can swipe up (or down) on a photo/video to delete it. For those who do not have the same Gallery app, it's exactly like closing applications on iOS.
I've tried scanning though the source code for the Gallery app, but no luck finding the correct Activity.

view.setOnTouchListener(new View.OnTouchListener(){
public boolean onTouch(View v, MotionEvent motion) {
float y = motion.getY();
/* NOTE: the following line might need to be in runOnUiThread() */
view.animate().alpha(1-Math.abs(y-height/2)/(height/2)).setDuration(50).start();
return true; //false if you want to pass this event on to other listeners
}
});
The explanation for using 1-Math.abs(y-height/2)/(height/2) is that I want alpha to be 1 when I am in the center, and alpha to be 0 when it is at the top or bottom. You have to determine yourself how you obtain the height value, or if you want to use a different method to calculate alpha. If you want to get the touch position relative to the screen instead of the position relative to the view, use getRawY().
Additionally, it may be useful for you to know that to see if the MotionEvent is a press, drag, or release event, use
motion.getAction() == with MotionEvent.ACTION_UP, MotionEvent.ACTION_MOVE, and MotionEvent.ACTION_DOWN, respectively.

I ended up getting this working more-or-less by cloning the well-written Android-SwipeToDismiss library and just replacing the ListView code with a ViewPager.
The finished product looked like this.

Check the below code, this may helpful to you:
public class MainActivity extends Activity implements View.OnTouchListener{
private RelativeLayout baseLayout;
private int previousFingerPosition = 0;
private int baseLayoutPosition = 0;
private int defaultViewHeight;
private boolean isClosing = false;
private boolean isScrollingUp = false;
private boolean isScrollingDown = false;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_popup);
baseLayout = (RelativeLayout) findViewById(R.id.base_popup_layout);//this is the main layout
baseLayout.setOnTouchListener(this);
}
public boolean onTouch(View view, MotionEvent event) {
// Get finger position on screen
final int Y = (int) event.getRawY();
// Switch on motion event type
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
// save default base layout height
defaultViewHeight = baseLayout.getHeight();
// Init finger and view position
previousFingerPosition = Y;
baseLayoutPosition = (int) baseLayout.getY();
break;
case MotionEvent.ACTION_UP:
// If user was doing a scroll up
if(isScrollingUp){
// Reset baselayout position
baseLayout.setY(0);
// We are not in scrolling up mode anymore
isScrollingUp = false;
}
// If user was doing a scroll down
if(isScrollingDown){
// Reset baselayout position
baseLayout.setY(0);
// Reset base layout size
baseLayout.getLayoutParams().height = defaultViewHeight;
baseLayout.requestLayout();
// We are not in scrolling down mode anymore
isScrollingDown = false;
}
break;
case MotionEvent.ACTION_MOVE:
if(!isClosing){
int currentYPosition = (int) baseLayout.getY();
// If we scroll up
if(previousFingerPosition >Y){
// First time android rise an event for "up" move
if(!isScrollingUp){
isScrollingUp = true;
}
// Has user scroll down before -> view is smaller than it's default size -> resize it instead of change it position
if(baseLayout.getHeight()<defaultViewHeight){
baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
baseLayout.requestLayout();
}
else {
// Has user scroll enough to "auto close" popup ?
if ((baseLayoutPosition - currentYPosition) > defaultViewHeight / 4) {
closeUpAndDismissDialog(currentYPosition);
return true;
}
//
}
baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));
}
// If we scroll down
else{
// First time android rise an event for "down" move
if(!isScrollingDown){
isScrollingDown = true;
}
// Has user scroll enough to "auto close" popup ?
if (Math.abs(baseLayoutPosition - currentYPosition) > defaultViewHeight / 2)
{
closeDownAndDismissDialog(currentYPosition);
return true;
}
// Change base layout size and position (must change position because view anchor is top left corner)
baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));
baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
baseLayout.requestLayout();
}
// Update position
previousFingerPosition = Y;
}
break;
}
return true;
}
}
For animation use the below methods:
public void closeUpAndDismissDialog(int currentPosition){
isClosing = true;
ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, -baseLayout.getHeight());
positionAnimator.setDuration(300);
positionAnimator.addListener(new Animator.AnimatorListener()
{
. . .
#Override
public void onAnimationEnd(Animator animator)
{
finish();
}
. . .
});
positionAnimator.start();
}
public void closeDownAndDismissDialog(int currentPosition){
isClosing = true;
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int screenHeight = size.y;
ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, screenHeight+baseLayout.getHeight());
positionAnimator.setDuration(300);
positionAnimator.addListener(new Animator.AnimatorListener()
{
. . .
#Override
public void onAnimationEnd(Animator animator)
{
finish();
}
. . .
});
positionAnimator.start();
}

Check if Android WebView is consuming touch events

TL;DR
How can I detect whether Android WebView consumed a touch event? onTouchEvent always returns true and WebViewClient's onUnhandledInputEvent is never triggered.
Detailed description
I have multiple WebViews inside a TwoDScrollView. As its name suggests, the TwoDScrollView can be scrolled both vertically and horizontally. The contents of TwoDScrollView can be zoomed in / out. When the user drags his finger or uses pinch-to-zoom, I want to dispatch the touch event to:
WebView if its content is scrollable / zoomable (i.e. only the inside of the WebView will scroll / zoom)
TwoDScrollView if the above condition is false (all contents of the TwoDScrollView will scroll / zoom)
I have partially achieved this by using the canScrollHorizontally and canScrollVertically methods. But these methods only work for "native scrolling". However, in some cases, some JavaScript inside the WebView consumes the touch event, for example Google Maps. In this case, the methods return false. Is there any way to find out whether the WebView's contents consumes the touch events, i.e. is scrollable / zoomable? I cannot change the contents of the WebView, therefore my question is different from this one.
I have considered checking touch handlers by executing some JavaScript inside the Webview by the evaluateJavaScript method, but according to this answer there is no easy way to achieve this and also the page can have some other nested iframes. Any help will be appreciated.
What I've already tried
I overrode WebView's onTouchEvent and read super.onTouchEvent() which always returns true, no matter what.
canScrollHorizontally and canScrollVertically only partially solve this problem, as mentioned above
onScrollChanged isn't useful either
WebViewClient.onUnhandledInputEvent is never triggered
I considered using JavaScript via evaluateJavaScript, but it is a very complicated and ugly solution
I tried to trace the MotionEvent by Debug.startMethodTracing. I found out it is propagated as follows:
android.webkit.WebView.onTouchEvent
com.android.webview.chromium.WebViewChromium.onTouchEvent
com.android.org.chromium.android_webview.AwContents.onTouchEvent
com.android.org.chromium.android_webview.AwContents$AwViewMethodsImpl.onTouchEvent
com.android.org.chromium.content.browser.ContentViewCore.onTouchEventImpl
According to ContentViewCore's source code the touch event ends up in a native method nativeOnTouchEvent and I don't know what further happens with it. Anyway, onTouchEvent always returns true and even if it was possible to find out somewhere whether the event was consumed or not, it would require using private methods which is also quite ugly.
Note
I don't need to know how to intercept touch events sent to WebView, but whether the WebView is consuming them, i.e. is using them for doing anything, such as scrolling, dragging etc.

According to this issue report, not possible.
If the web code is under your control, you can implement some JavaScriptInterface to workaround this. If not, I am afraid there is no solution here.

You can pass all touch events to GestureDetector by overriding onTouchEvent of WebView, so you can know when Android WebView is consuming touch events anywhere, anytime by listening to GestureDetector.
Try like this:
public class MyWebView extends WebView {
private Context context;
private GestureDetector gestDetector;
public MyWebView(Context context) {
super(context);
this.context = context;
gestDetector = new GestureDetector(context, gestListener);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
return gd.onTouchEvent(event);
}
GestureDetector.SimpleOnGestureListener gestListener= new GestureDetector.SimpleOnGestureListener() {
public boolean onDown(MotionEvent event) {
return true;
}
public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
//if (event1.getRawX() > event2.getRawX()) {
// show_toast("swipe left");
//} else {
// show_toast("swipe right");
//}
//you can trace any touch events here
return true;
}
};
void show_toast(final String text) {
Toast t = Toast.makeText(context, text, Toast.LENGTH_SHORT);
t.show();
}
}
I hope you be inspired.

This code will handle your scrolling events in a webview. This catch the click down and the click up events, and compares the positions of each one. It never minds that the content within the webview is scrollable, just compare the coordinates in the area of webview.
public class MainActivity extends Activity implements View.OnTouchListener, Handler.Callback {
private float x1,x2,y1,y2; //x1, y1 is the start of the event, x2, y2 is the end.
static final int MIN_DISTANCE = 150; //min distance for a scroll event
private static final int CLICK_ON_WEBVIEW = 1;
private static final int CLICK_ON_URL = 2;
private static final int UP_ON_WEBVIEW = 3;
private final Handler handler = new Handler(this);
public WebView webView;
private WebViewClient client;
private WebAppInterface webAppInt = new WebAppInterface(this);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView)findViewById(R.id.myWebView);
webView.setOnTouchListener(this);
client = new WebViewClient();
webView.setWebViewClient(client);
webView.loadDataWithBaseURL("file:///android_asset/", "myweb.html", "text/html", "UTF-8", "");
}
//HERE START THE IMPORTANT PART
#Override
public boolean onTouch(View v, MotionEvent event) {
if (v.getId() == R.id.myWebView && event.getAction() == MotionEvent.ACTION_DOWN){
x1 = event.getX();
y1 = event.getY();
handler.sendEmptyMessageDelayed(CLICK_ON_WEBVIEW, 200);
} else if (v.getId() == R.id.myWebView && event.getAction() == MotionEvent.ACTION_UP){
x2 = event.getX();
y2 = event.getY();
handler.sendEmptyMessageDelayed(UP_ON_WEBVIEW, 200);
}
return false;
}
#Override
public boolean handleMessage(Message msg) {
if (msg.what == CLICK_ON_URL){ //if you clic a link in the webview, thats not a scroll
handler.removeMessages(CLICK_ON_WEBVIEW);
handler.removeMessages(UP_ON_WEBVIEW);
return true;
}
if (msg.what == CLICK_ON_WEBVIEW){
//Handle the click in the webview
Toast.makeText(this, "WebView clicked", Toast.LENGTH_SHORT).show();
return true;
}
if (msg.what == UP_ON_WEBVIEW){
float deltaX = x2 - x1; //horizontal move distance
float deltaY = y2 - y1; //vertical move distance
if ((Math.abs(deltaX) > MIN_DISTANCE) && (Math.abs(deltaX) > Math.abs(deltaY)))
{
// Left to Right swipe action
if (x2 > x1)
{
//Handle the left to right swipe
Toast.makeText(this, "Left to Right swipe", Toast.LENGTH_SHORT).show ();
}
// Right to left swipe action
else
{
//Handle the right to left swipe
Toast.makeText(this, "Right to Left swipe", Toast.LENGTH_SHORT).show ();
}
}
else if ((Math.abs(deltaY) > MIN_DISTANCE) && (Math.abs(deltaY) > Math.abs(deltaX)))
{
// Top to Bottom swipe action
if (y2 > y1)
{
//Handle the top to bottom swipe
Toast.makeText(this, "Top to Bottom swipe", Toast.LENGTH_SHORT).show ();
}
// Bottom to top swipe action -- I HIDE MY ACTIONBAR ON SCROLLUP
else
{
getActionBar().hide();
Toast.makeText(this, "Bottom to Top swipe [Hide Bar]", Toast.LENGTH_SHORT).show ();
}
}
return true;
}
return false;
}
}
You can also try to control the speed of the swipe, to detect it as a real swipe or scrolling.
I hope that helps you.

Try to set the android:isClickable="true" in the XML and create an onClickListener in the Java code.

Actually now Touch Actions are not supported for webview. But some workarounds are available;
I am going to show it with a longpress example : I am using Pointoption because i will get the coordinate of element and will use it for longpress.
public void longpress(PointOption po) {
//first you need to switch to native view
driver.switchToNativeView();
TouchAction action = new TouchAction((PerformsTouchActions) driver);
action.longPress(po).waitAction(WaitOptions.waitOptions(Duration.ofSeconds(2)));
action.release();
action.perform();
driver.switchToDefaultWebView();
}
For to get the coordinate of element i designed below methood
public PointOption getElementLocation(WebElement element) {
int elementLocationX;
int elementLocationY;
//get element location in webview
elementLocationX = element.getLocation().getX();
elementLocationY = element.getLocation().getY();
//get the center location of the element
int elementWidthCenter = element.getSize().getWidth() / 2;
int elementHeightCenter = element.getSize().getHeight() / 2;
int elementWidthCenterLocation = elementWidthCenter + elementLocationX;
int elementHeightCenterLocation = elementHeightCenter + elementLocationY;
//calculate the ratio between actual screen dimensions and webview dimensions
float ratioWidth = device.getDeviceScreenWidth() / ((MobileDevice) device)
.getWebViewWidth().intValue();
float ratioHeight = device.getDeviceScreenHeight() / ((MobileDevice) device)
.getWebViewHeight().intValue();
//calculate the actual element location on the screen , if needed you can increase this value,for example i used 115 for one of my mobile devices.
int offset = 0;
float elementCenterActualX = elementWidthCenterLocation * ratioWidth;
float elementCenterActualY = (elementHeightCenterLocation * ratioHeight) + offset;
float[] elementLocation = {elementCenterActualX, elementCenterActualY};
int elementCoordinateX, elementCoordinateY;
elementCoordinateX = (int) Math.round(elementCenterActualX);
elementCoordinateY = (int) Math.round(elementCenterActualY);
PointOption po = PointOption.point(elementCoordinateX, elementCoordinateY);
return po;
}
now you have a longpress(PointOption po) and getElementLocation(Webelement element) methods that gives you po. Now everything is ready and you can use them as below..
longpress(getElementLocation(driver.findElement(By.id("the selector can be any of them(xpath,css,classname,id etc.)")));