Develop Reference

Create ListPopUpWindow as designed by Material in Android

I'm trying to create a select menu in Android instead of using Spinner, but i'm facing some problems with the layout. How can I create something like the image below using ListPopUpWindow?
Thanks

I really like these menus floating over selected items, so I created my own DropDown class which implements your case. It does pretty much what #uguboz wrote.
I'm using PopupWindow with a custom layout with a RecyclerView. Then I handle onClick, display that window and use overriden PopupWindow.update() to calculate correct window position.
The most interesting part would be this code:
public class DropDownMenu extends PopupWindow {
public boolean show(View anchor) {
mAnchorView = anchor;
super.showAtLocation(anchor, Gravity.START | Gravity.TOP, 0, 0);
update();
return true;
}
public void update() {
final Resources res = getContentView().getContext().getResources();
int margin = (int) res.getDimension(R.dimen.carbon_margin);
int itemHeight = (int) res.getDimension(R.dimen.carbon_listItemHeight);
int marginHalf = (int) res.getDimension(R.dimen.carbon_paddingHalf);
ArrayAdapter adapter = getAdapter();
Rect windowRect = new Rect();
mAnchorView.getWindowVisibleDisplayFrame(windowRect);
int hWindow = windowRect.bottom - windowRect.top;
int wWindow = windowRect.right - windowRect.left;
int[] location = new int[2];
mAnchorView.getLocationInWindow(location);
if (mode == DropDown.Mode.Over) {
int maxHeightAbove = location[1] - windowRect.top - marginHalf * 2;
int maxItemsAbove = maxHeightAbove / itemHeight;
int maxHeightBelow = hWindow - location[1] - marginHalf * 2;
int maxItemsBelow = maxHeightBelow / itemHeight;
int itemsBelow = Math.min(adapter.getItemCount() - selectedItem, maxItemsBelow);
int itemsAbove = Math.min(selectedItem, maxItemsAbove);
int popupX = location[0] - margin - marginHalf;
int popupY = location[1] - marginHalf * 2 - itemsAbove * itemHeight - (itemHeight - (mAnchorView.getHeight() - mAnchorView.getPaddingTop() -
mAnchorView.getPaddingBottom())) / 2 + mAnchorView.getPaddingTop();
int popupWidth = mAnchorView.getWidth() + margin * 2 + marginHalf * 2 - mAnchorView.getPaddingLeft() - mAnchorView.getPaddingRight();
int popupHeight = marginHalf * 4 + Math.max(1, itemsAbove + itemsBelow) * itemHeight;
popupWidth = Math.min(popupWidth, wWindow - marginHalf * 2);
popupX = Math.max(popupX, 0);
popupX = Math.min(popupX, wWindow - popupWidth);
LinearLayoutManager manager = (LinearLayoutManager) recycler.getLayoutManager();
manager.scrollToPositionWithOffset(selectedItem - itemsAbove, 0);
update(popupX, popupY, popupWidth, popupHeight);
} else {
// not interesting
}
super.update();
}
}
The code is way too long to paste it here with all details, so I'll serve you a link to the class: DropDownMenu. Use it as you wish. I hope you'll find the code useful.
And I've made a sample for that image from the guidelines. It can be found in the sample app under Guidelines -> Menus/Behavior

How can i swipe horizontally after locating an element using Appium in an Android app?

I have used the following code, but it is not working:
int startX = driver.findElement(By.xpath("//*[#class='android.widget.FrameLayout' and #index='1']")).getLocation.getX();
int startY = driver.findElement(By.xpath("//*[#class='android.widget.FrameLayout' and #index='1']")).getLocation.getY();
and the error I get is:
getLocation cannot be resolved or is not a field

Firstly you should try getting location as getLocation()instead of: .getLocation.getY().
Secondly you can implement swipe/scroll in all directions using:
TouchAction action = new TouchAction(driver);
int startY = element1.getLocation().getY() + (element1.getSize().getHeight() / 2);
int startX = element1.getLocation().getX() + (element1.getSize().getWidth() / 2);
int endX = element2.getLocation().getX() + (element2.getSize().getWidth() / 2);
int endY = element2.getLocation().getY() + (element2.getSize().getHeight() / 2);
action.press(startX, startY).waitAction(2000).moveTo(endX, endY).release().perform();

public void horizontalScroll()
{
size=driver.manage().window().getSize();
int x_start=(int)(size.width*0.60);
int x_end=(int)(size.width*0.30);
int y=130;
driver.swipe(x_start,y,x_end,y,4000);
}
Best Tutorial to understand horizontal scroll - CLICK HERE

Android PopupWindow not changing position after calling update()

My Android app has a game map with markers on it. When the user taps a marker, I'm displaying a PopupWindow aligned with the map marker (similar to Google Maps). The problem I'm having is if a marker is close to the top of the screen, the PopupWindow overlaps with the ActionBar (and under the status bar, if the marker is high enough).
I'm displaying the PopupWindow by calling showAtLocation(), which I'd hoped would constrain the view to inside the "Map" fragment (it does on the left and right sides), but that's not working.
I had already implemented an adjustment, to account for text inside the popup taking up more than one line, where I update the Y position of the popup after the View has been laid out. That worked with no problem, but when I tried to add another vertical adjustment for this situation, the PopupWindow's position does not change.
Here is the code for the PopupWindow implementation:
/**
* Displays a PopupWindow.
*/
public class MyPopupWindow extends PopupWindow
{
private Fragment m_fragment;
private int m_x;
private int m_y;
/**
* Displays a PopupWindow at a certain offset (x, y) from the center of fragment's view.
*/
public static MyPopupWindow createPopup (Context context, Fragment fragment, int x, int y)
{
// Create the PopupWindow's content view
LayoutInflater inflater = LayoutInflater.from (context);
View popupView = inflater.inflate (R.layout.view_map_popup, null);
MyPopupWindow popupWindow = new MyPopupWindow (popupView, x, y);
popupWindow.m_fragment = fragment;
popupWindow.showAtLocation (fragment.getView (), Gravity.CENTER, x, y);
return popupWindow;
}
private MyPopupWindow (View view, int x, int y)
{
super (view, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
m_x = x;
m_y = y;
TextView title = (TextView) view.findViewById (R.id.lblMapPopupTitle);
title.setText ("Exercise Title");
TextView description = (TextView) view.findViewById (R.id.lblMapPopupDescription);
description.setText ("Exercise Description\nSecond Line\nThird Line\nFourth Line\nAnd one more...");
view.setVisibility (View.INVISIBLE);
view.addOnLayoutChangeListener (layoutChangeListener);
}
// If the tapped map location is too close to the edge, determine the
// delta-x and delta-y needed to align it with the PopupWindow
private int getHorizontalAdjustment (int popupWidth)
{
int horizontalAdjustment = 0;
int parentWidth = m_fragment.getView ().getWidth ();
if ((parentWidth / 2) + m_x + (popupWidth / 2) > parentWidth)
{
horizontalAdjustment = parentWidth - ((parentWidth / 2) + m_x + (popupWidth / 2));
}
else if ((parentWidth / 2) + m_x - (popupWidth / 2) < 0)
{
horizontalAdjustment = 0 - ((parentWidth / 2) + m_x - (popupWidth / 2));
}
return horizontalAdjustment;
}
private int getVerticalAdjustment (int popupHeight)
{
int verticalAdjustment = 0;
int parentHeight = m_fragment.getView ().getHeight ();
int y = m_y - (popupHeight / 2);
if ((parentHeight / 2) + y + (popupHeight / 2) > parentHeight)
{
verticalAdjustment = parentHeight - ((parentHeight / 2) + y + (popupHeight / 2));
}
else if ((parentHeight / 2) + y - (popupHeight / 2) < 20)
{
verticalAdjustment = 20 - ((parentHeight / 2) + y - (popupHeight / 2));
}
return verticalAdjustment;
}
private View.OnLayoutChangeListener layoutChangeListener = new View.OnLayoutChangeListener ()
{
#Override
public void onLayoutChange (View view, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom)
{
int height = bottom - top;
int width = right - left;
// Adjust the y-position for the inflated height of the view
// (so the popup's bottom edge lines up with the tapped marker's top edge)
int y = m_y - (height / 2);
int x = m_x;
// Determine any adjustments that need to be made to line up the tapped marker with the popup
int horizontalAdjustment = getHorizontalAdjustment (width);
int verticalAdjustment = getVerticalAdjustment (height);
y -= verticalAdjustment;
// Update our position with the re-calculated position
update (x, y, -1, -1);
view.setVisibility (View.VISIBLE);
}
};
}
The issue can be seen in this screenshot: PopupWindow overlaps ActionBar
Basically, I need to either (1) get the PopupWindow to clip to the Fragment's view and not overlap the ActionBar, or (2) get the PopupWindow to update its position in the event that it does overlap the ActionBar.
Any help is greatly appreciated.

How to create move/resize animations in Android?

Does someone know about Android animations? I want to create something like following:
I have a big image in the center of my device screen;
this image becomes small (by animation) and goes to the corner of my device screen;
Its something like in this bellow sequence:
Any hints would be very appreciated! Thanks in advance!

Use ViewPropertyAnimator, with methods like scaleXBy() and translateYBy(). You get a ViewPropertyAnimator by calling animate() on a View, on API Level 11+. If you are supporting older devices, NineOldAndroids offers a near-workalike backport.
You might also wish to read:
http://android-developers.blogspot.com/2011/05/introducing-viewpropertyanimator.html
http://developer.android.com/guide/topics/graphics/prop-animation.html

I have a class with the simultaneous rotation and movement. It's costly but it works on all API versions.
public class ResizeMoveAnimation extends Animation {
View view;
int fromLeft;
int fromTop;
int fromRight;
int fromBottom;
int toLeft;
int toTop;
int toRight;
int toBottom;
public ResizeMoveAnimation(View v, int toLeft, int toTop, int toRight, int toBottom) {
this.view = v;
this.toLeft = toLeft;
this.toTop = toTop;
this.toRight = toRight;
this.toBottom = toBottom;
fromLeft = v.getLeft();
fromTop = v.getTop();
fromRight = v.getRight();
fromBottom = v.getBottom();
setDuration(500);
}
#Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
float left = fromLeft + (toLeft - fromLeft) * interpolatedTime;
float top = fromTop + (toTop - fromTop) * interpolatedTime;
float right = fromRight + (toRight - fromRight) * interpolatedTime;
float bottom = fromBottom + (toBottom - fromBottom) * interpolatedTime;
RelativeLayout.LayoutParams p = (LayoutParams) view.getLayoutParams();
p.leftMargin = (int) left;
p.topMargin = (int) top;
p.width = (int) ((right - left) + 1);
p.height = (int) ((bottom - top) + 1);
view.requestLayout();
}
}

Getting View's coordinates relative to the root layout

Can I get a View's x and y position relative to the root layout of my Activity in Android?

The Android API already provides a method to achieve that.
Try this:
Rect offsetViewBounds = new Rect();
//returns the visible bounds
childView.getDrawingRect(offsetViewBounds);
// calculates the relative coordinates to the parent
parentViewGroup.offsetDescendantRectToMyCoords(childView, offsetViewBounds);
int relativeTop = offsetViewBounds.top;
int relativeLeft = offsetViewBounds.left;
Here is the doc

This is one solution, though since APIs change over time and there may be other ways of doing it, make sure to check the other answers. One claims to be faster, and another claims to be easier.
private int getRelativeLeft(View myView) {
if (myView.getParent() == myView.getRootView())
return myView.getLeft();
else
return myView.getLeft() + getRelativeLeft((View) myView.getParent());
}
private int getRelativeTop(View myView) {
if (myView.getParent() == myView.getRootView())
return myView.getTop();
else
return myView.getTop() + getRelativeTop((View) myView.getParent());
}
Let me know if that works.
It should recursively just add the top and left positions from each parent container.
You could also implement it with a Point if you wanted.

Please use view.getLocationOnScreen(int[] location); (see Javadocs). The answer is in the integer array (x = location[0] and y = location[1]).

View rootLayout = view.getRootView().findViewById(android.R.id.content);
int[] viewLocation = new int[2];
view.getLocationInWindow(viewLocation);
int[] rootLocation = new int[2];
rootLayout.getLocationInWindow(rootLocation);
int relativeLeft = viewLocation[0] - rootLocation[0];
int relativeTop = viewLocation[1] - rootLocation[1];
First I get the root layout then calculate the coordinates difference with the view.
You can also use the getLocationOnScreen() instead of getLocationInWindow().

No need to calculate it manually.
Just use getGlobalVisibleRect like so:
Rect myViewRect = new Rect();
myView.getGlobalVisibleRect(myViewRect);
float x = myViewRect.left;
float y = myViewRect.top;
Also note that for the centre coordinates, rather than something like:
...
float two = (float) 2
float cx = myViewRect.left + myView.getWidth() / two;
float cy = myViewRect.top + myView.getHeight() / two;
You can just do:
float cx = myViewRect.exactCenterX();
float cy = myViewRect.exactCenterY();

You can use `
view.getLocationOnScreen(int[] location)
;` to get location of your view correctly.
But there is a catch if you use it before layout has been inflated you will get wrong position.
Solution to this problem is adding ViewTreeObserver like this :-
Declare globally the array to store x y position of your view
int[] img_coordinates = new int[2];
and then add ViewTreeObserver on your parent layout to get callback for layout inflation and only then fetch position of view otherwise you will get wrong x y coordinates
// set a global layout listener which will be called when the layout pass is completed and the view is drawn
parentViewGroup.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout() {
//Remove the listener before proceeding
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
parentViewGroup.getViewTreeObserver().removeOnGlobalLayoutListener(this);
} else {
parentViewGroup.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
// measure your views here
fab.getLocationOnScreen(img_coordinates);
}
}
);
and then use it like this
xposition = img_coordinates[0];
yposition = img_coordinates[1];

I wrote myself two utility methods that seem to work in most conditions, handling scroll, translation and scaling, but not rotation. I did this after trying to use offsetDescendantRectToMyCoords() in the framework, which had inconsistent accuracy. It worked in some cases but gave wrong results in others.
"point" is a float array with two elements (the x & y coordinates), "ancestor" is a viewgroup somewhere above the "descendant" in the tree hierarchy.
First a method that goes from descendant coordinates to ancestor:
public static void transformToAncestor(float[] point, final View ancestor, final View descendant) {
final float scrollX = descendant.getScrollX();
final float scrollY = descendant.getScrollY();
final float left = descendant.getLeft();
final float top = descendant.getTop();
final float px = descendant.getPivotX();
final float py = descendant.getPivotY();
final float tx = descendant.getTranslationX();
final float ty = descendant.getTranslationY();
final float sx = descendant.getScaleX();
final float sy = descendant.getScaleY();
point[0] = left + px + (point[0] - px) * sx + tx - scrollX;
point[1] = top + py + (point[1] - py) * sy + ty - scrollY;
ViewParent parent = descendant.getParent();
if (descendant != ancestor && parent != ancestor && parent instanceof View) {
transformToAncestor(point, ancestor, (View) parent);
}
}
Next the inverse, from ancestor to descendant:
public static void transformToDescendant(float[] point, final View ancestor, final View descendant) {
ViewParent parent = descendant.getParent();
if (descendant != ancestor && parent != ancestor && parent instanceof View) {
transformToDescendant(point, ancestor, (View) parent);
}
final float scrollX = descendant.getScrollX();
final float scrollY = descendant.getScrollY();
final float left = descendant.getLeft();
final float top = descendant.getTop();
final float px = descendant.getPivotX();
final float py = descendant.getPivotY();
final float tx = descendant.getTranslationX();
final float ty = descendant.getTranslationY();
final float sx = descendant.getScaleX();
final float sy = descendant.getScaleY();
point[0] = px + (point[0] + scrollX - left - tx - px) / sx;
point[1] = py + (point[1] + scrollY - top - ty - py) / sy;
}

Incase someone is still trying to figure this out. This is how you get the center X and Y of the view.
int pos[] = new int[2];
view.getLocationOnScreen(pos);
int centerX = pos[0] + view.getMeasuredWidth() / 2;
int centerY = pos[1] + view.getMeasuredHeight() / 2;

I just found the answer here
It says:
It is possible to retrieve the location of a view by invoking the methods getLeft() and getTop(). The former returns the left, or X, coordinate of the rectangle representing the view. The latter returns the top, or Y, coordinate of the rectangle representing the view. These methods both return the location of the view relative to its parent. For instance, when getLeft() returns 20, that means the view is located 20 pixels to the right of the left edge of its direct parent.
so use:
view.getLeft(); // to get the location of X from left to right
view.getRight()+; // to get the location of Y from right to left

You can use the following the get the difference between parent and the view you interested in:
private int getRelativeTop(View view) {
final View parent = (View) view.getParent();
int[] parentLocation = new int[2];
int[] viewLocation = new int[2];
view.getLocationOnScreen(viewLocation);
parent.getLocationOnScreen(parentLocation);
return viewLocation[1] - parentLocation[1];
}
Dont forget to call it after the view is drawn:
timeIndicator.getViewTreeObserver().addOnGlobalLayoutListener(() -> {
final int relativeTop = getRelativeTop(timeIndicator);
});