Develop Reference

Android - Insert textview on the touched xy position where views overlap touched close to another view

Here is the problem I am facing. On a empty relative layout, when touched textview is instantiated at the touched x y position. I got this far correct, but the problem is that when I touch on the empty space near already instantiated view, previous view and currently placed views are overlapped. I tried by the getting the child views of the layout and checking the current view and already placed view using rect data that if they intersect. How to solve this problem?
Here is the code:
public class MainActivity extends AppCompatActivity
{
private int id = 0;
private RelativeLayout root;
private RelativeLayout.LayoutParams params;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_designer);
root = (RelativeLayout) findViewById(R.id.rootlayout);
root.setOnTouchListener(new View.OnTouchListener()
{
#Override
public boolean onTouch(View v, MotionEvent event)
{
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
instantiateView(v, event);
break;
}
return true;
}
});
}
private void instantiateView(View v, MotionEvent event)
{
int x = (int) event.getX();
int y = (int) event.getY();
TextView bt = new TextView(DesignerActivity.this);
bt.setText("1");
bt.setId(++id);
bt.setBackgroundColor(Color.BLACK);
bt.setTextColor(Color.WHITE);
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
showDialog();
}
});
params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(x, y, 0, 0);
bt.setLayoutParams(params);
//((ViewGroup) v).addView(bt);
if(root.getChildCount() <= 0)
{
((ViewGroup) v).addView(bt);
}
else
{
for (int i = 0; i < root.getChildCount(); i++)
{
if (!checkCollision(bt, root.getChildAt(i)))
{
if(bt != root.getChildAt(i))
{
((ViewGroup) v).addView(bt);
}
}
}
}
}
private void showDialog()
{
final Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.dialog_layout);
Button editBtn = (Button) dialog.findViewById(R.id.button1);
Button deleteBtn = (Button) dialog.findViewById(R.id.button2);
editBtn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
dialog.dismiss();
}
});
deleteBtn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
dialog.dismiss();
}
});
dialog.show();
}
private boolean checkCollision(View v1, View v2)
{
Rect r1 = new Rect(v1.getLeft(), v1.getTop(), v1.getRight(), v1.getBottom());
Rect r2 = new Rect(v2.getLeft(), v2.getTop(), v2.getRight(), v2.getBottom());
return r1.intersect(r2);
}
}

You are using Relative Layout that's why your Textviews are overlapping.
If you don't want the overlapping and want to place it next or somewhere else to the overlapped view , it is your decision. Just check if they intersect and take appropriate decision based on your requirement.
Below line is the problem in your code.
Rect r1 = new Rect(v1.getLeft(), v1.getTop(), v1.getRight(), v1.getBottom());
You set the params' Margin does not mean that you will get desired left,top,right, bottom values.You will get these values right after the inflation of your view hierarchy.
You can use this function:
private boolean checkCollision(View v1, View v2)
{
int leftMargin = ((RelativeLayout.LayoutParams) v1.getLayoutParams()).leftMargin;
int topMargin = ((RelativeLayout.LayoutParams) v1.getLayoutParams()).topMargin;
Rect r1 = new Rect(root.getPaddingLeft() + leftMargin, root.getPaddingTop() + topMargin,
root.getPaddingLeft() + leftMargin + v2.getWidth(), root.getPaddingTop() + topMargin + v2.getHeight());
Rect r2 = new Rect(v2.getLeft(), v2.getTop(), v2.getRight(), v2.getBottom());
return r1.intersect(r2);
}
After that use
params.addRule(); according to your requirement where you want to place your overlapping view.

android: setting a button programmatically using setX and setY

public class Game_collecting_view extends View
{
Button image_boy;
private static final int BOY_DIAMETER = 200; // initial spot size
int boy_width =0;
int boy_height =0;
public void setGame_collecting(Game_collecting mGame_collecting)
{
this.mGame_collecting = mGame_collecting;
}
// constructs a new View
public Game_collecting_view(Context context, RelativeLayout parentLayout)
{
super(context);
resources = context.getResources(); // save Resources for loading external values
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// get references to various GUI components
relativeLayout = parentLayout;
spotHandler = new Handler(); // used to add spots when game starts
}
#Override
protected void onSizeChanged(int width, int height, int oldw, int oldh)
{
viewWidth = width; // save the new width
viewHeight = height; // save the new height
}
public void set_boy()
{
final Button boy = (Button) layoutInflater.inflate(R.layout.untouched, null);
boy.setX(viewWidth /2);
boy.setY(viewHeight - BOY_DIAMETER);
boy.setPadding(0,0,0,0);
boy.setBackgroundResource(R.drawable.blue);
boy.setLayoutParams(new RelativeLayout.LayoutParams(BOY_DIAMETER, BOY_DIAMETER));
relativeLayout.addView(boy); // add spot to the screen
Toast.makeText(getContext(), "set_boy\nviewWidth=" +viewHeight +"\nviewHeight=" +viewHeight, Toast.LENGTH_SHORT).show();
boy.setOnClickListener
(
new OnClickListener()
{
public void onClick(View v)
{
touchedSpot(boy);
}
}
);
}
public void resume(Context context)
{
resetGame();
}
public void resetGame()
{
for (int i = 1; i <= INITIAL_SPOTS; ++i)
{
spotHandler.postDelayed(addSpotRunnable, i * SPOT_DELAY);
generate_text();
}
set_boy();
}
private Runnable addSpotRunnable = new Runnable()
{
public void run()
{
addNewSpot(); // add a new spot to the game
}
};
Objective:
I would like to set the boy icon at the bottom middle of the screen.
The boy icon is set at this way for later dynamic interface (swipe the screen to the right the boy icon will move to the right, vice versa)
Observation:
The toast reports both the viewWidth and viewHeight =0, and the boy icon appears at 0,0 (left upper corner). If I set the setY(viewHeight + BOY_DIAMETER), the boy icon will be located at (0, 200).
Question:
I would like to ask why the viewWidth and viewHeight both report 0. How could the onSizeChanged be called immediately such that the boy icone could be set at the bottom center of the screen?
Thanks!!

The location is null until Android has calculated their positions. You can retrieve the height and width like this:
image_boy.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
int height = image_boy.getHeight();
int width = image_boy.getWidth();
//these values won't be null
}
});

set layout param for setting the view position

Gallery like view with center image zoom

Here I need a gallery like view with only three images to be shown at a time on screen. In this the middle image will be larger than the two other images on its sides.
If the user scrolls the view next images will slide on screen as it does in gallery and at a time only three images will be shown out of which the center image should automatically zoom when it is shown on screen and remaining two should be smaller than it.
Here I can't use gallery because it is depreciated in android.
I was able to make a gallery like view with help of viewpager using code on this link. It shows only three images on screen at a time, which fits my one requirement. But i am not able to get the central image that is visible on screen and zoom it. Although I was able to get the clicked image on screen.
Can someone please tell me where do I need to modify this code and what I need to add in it to get the image that is in center from the images shown on screen and zoom it.
I know that there is no center image on screen according to viewpager and it is just showing three images on screen at a time because of modifications in code.
I have also tried:-
GridView with horizontal scroll
HorizontalScrollView with horizontal linear layout
but viewpager seems to be a better solution, because it stops the scrolling with only three items on screen because of viewpager's inherent properties.
and If someone knows any other method to achieve it, please tell me and I'll try it.
P.S. For anyone who wants the full code, I have added it as an answer, which has zoom capability also. Just few additions in accepted answer. :)

Following code will help you to make a gallery like view which will have center lock. It responds to touch and swipe both. It shows three images on the screen at a time and the center image is zoomed.
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class CenteringHorizontalScrollView extends HorizontalScrollView implements View.OnTouchListener {
private Context mContext;
private static final int SWIPE_PAGE_ON_FACTOR = 10;
private int mActiveItem;
private float mPrevScrollX;
private boolean mStart;
private int mItemWidth;
View targetLeft, targetRight;
ImageView leftImage, rightImage;
public CenteringHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext=context;
mItemWidth = 100; // or whatever your item width is.
setOnTouchListener(this);
}
#Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getRawX();
boolean handled = false;
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
if (mStart) {
mPrevScrollX = x;
mStart = false;
}
break;
case MotionEvent.ACTION_UP:
mStart = true;
int minFactor = mItemWidth / SWIPE_PAGE_ON_FACTOR;
if ((mPrevScrollX - (float) x) > minFactor) {
if (mActiveItem < getMaxItemCount() - 1) {
mActiveItem = mActiveItem + 1;
}
}else if (((float) x - mPrevScrollX) > minFactor) {
if (mActiveItem > 0) {
mActiveItem = mActiveItem - 1;
}
}
scrollToActiveItem();
handled = true;
break;
}
return handled;
}
private int getMaxItemCount() {
return ((LinearLayout) getChildAt(0)).getChildCount();
}
private LinearLayout getLinearLayout() {
return (LinearLayout) getChildAt(0);
}
/**
* Centers the current view the best it can.
*/
public void centerCurrentItem() {
if (getMaxItemCount() == 0)
return;
int currentX = getScrollX();
View targetChild;
int currentChild = -1;
do {
currentChild++;
targetChild = getLinearLayout().getChildAt(currentChild);
} while (currentChild < getMaxItemCount() && targetChild.getLeft() < currentX);
if (mActiveItem != currentChild) {
mActiveItem = currentChild;
scrollToActiveItem();
}
}
/**
* Scrolls the list view to the currently active child.
*/
private void scrollToActiveItem() {
int maxItemCount = getMaxItemCount();
if (maxItemCount == 0)
return;
int targetItem = Math.min(maxItemCount - 1, mActiveItem);
targetItem = Math.max(0, targetItem);
mActiveItem = targetItem;
// Scroll so that the target child is centered
View targetView = getLinearLayout().getChildAt(targetItem);
ImageView centerImage = (ImageView)targetView;
int height=300;//set size of centered image
LinearLayout.LayoutParams flparams = new LinearLayout.LayoutParams(height, height);
centerImage.setLayoutParams(flparams);
//get the image to left of the centered image
if((targetItem-1)>=0){
targetLeft = getLinearLayout().getChildAt(targetItem-1);
leftImage = (ImageView)targetLeft;
int width=250;//set the size of left image
LinearLayout.LayoutParams leftParams = new LinearLayout.LayoutParams(width,width);
leftParams.setMargins(0, 30, 0, 0);
leftImage.setLayoutParams(leftParams);
}
//get the image to right of the centered image
if((targetItem+1)<maxItemCount){
targetRight = getLinearLayout().getChildAt(targetItem+1);
rightImage = (ImageView)targetRight;
int width=250;//set the size of right image
LinearLayout.LayoutParams rightParams = new LinearLayout.LayoutParams(width,width);
rightParams.setMargins(0, 30, 0, 0);
rightImage.setLayoutParams(rightParams);
}
int targetLeft = targetView.getLeft();
int childWidth = targetView.getRight() - targetLeft;
int width = getWidth() - getPaddingLeft() - getPaddingRight();
int targetScroll = targetLeft - ((width - childWidth) / 2);
super.smoothScrollTo(targetScroll, 0);
}
/**
* Sets the current item and centers it.
* #param currentItem The new current item.
*/
public void setCurrentItemAndCenter(int currentItem) {
mActiveItem = currentItem;
scrollToActiveItem();
}
}
In your xml add the horizontal scroll view like follow:-
<com.yourpackagename.CenteringHorizontalScrollView
android:id="#+id/HSVImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/Horizontalalternative">
<LinearLayout
android:id="#+id/linearImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
</LinearLayout>
</com.yourpackagename.CenteringHorizontalScrollView>
Define a Linear layout in your activity.
LinearLayout imageGallery;
Then get it as follows:-
imageGallery=(LinearLayout)findViewById(R.id.linearImage);
Now you have to add imageView to your LinearLayout. Here I assume that you have images in your drawable folder and you have made an array of ids of your images that you want to add to gallery. So you can do it via following method in your activity:-
for(int i=0; i<lengthOfImageIdArray; i++){
ImageView image=new ImageView(YourActivityName.this);
image.setBackgroundResource(yourArrayName[i]);
imageGallery.addView(image);
}
You can also set the width of images dynamically, so that they fit every screen, with only little extra effort.

Override setPrimaryItem in your ViewPager and make the center item bigger.
What was the issue with using a HorizontalScrollView with a LinearLayout? If it's centering you may be able to do something similar to this (assuming you've
/**
* A centering HSV loosely based on http://iotasol.blogspot.com/2011/08/creating-custom-horizontal-scroll-view.html
*/
public class CenteringHorizontalScrollView extends HorizontalScrollView implements View.OnTouchListener {
private static final int SWIPE_PAGE_ON_FACTOR = 10;
private int mActiveItem;
private float mPrevScrollX;
private boolean mStart;
private int mItemWidth;
public CenteringHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mItemWidth = 100; // or whatever your item width is.
setOnTouchListener(this);
}
#Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getRawX();
boolean handled = false;
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
if (mStart) {
mPrevScrollX = x;
mStart = false;
}
break;
case MotionEvent.ACTION_UP:
mStart = true;
int minFactor = mItemWidth / SWIPE_PAGE_ON_FACTOR;
if ((mPrevScrollX - (float) x) > minFactor) {
if (mActiveItem < getMaxItemCount() - 1) {
mActiveItem = mActiveItem + 1;
}
}
else if (((float) x - mPrevScrollX) > minFactor) {
if (mActiveItem > 0) {
mActiveItem = mActiveItem - 1;
}
}
scrollToActiveItem();
handled = true;
break;
}
return handled;
}
private int getMaxItemCount() {
return ((LinearLayout) getChildAt(0)).getChildCount();
}
private LinearLayout getLinearLayout() {
return (LinearLayout) getChildAt(0);
}
/**
* Centers the current view the best it can.
*/
public void centerCurrentItem() {
if (getMaxItemCount() == 0) {
return;
}
int currentX = getScrollX();
View targetChild;
int currentChild = -1;
do {
currentChild++;
targetChild = getLinearLayout().getChildAt(currentChild);
} while (currentChild < getMaxItemCount() && targetChild.getLeft() < currentX);
if (mActiveItem != currentChild) {
mActiveItem = currentChild;
scrollToActiveItem();
}
}
/**
* Scrolls the list view to the currently active child.
*/
private void scrollToActiveItem() {
int maxItemCount = getMaxItemCount();
if (maxItemCount == 0) {
return;
}
int targetItem = Math.min(maxItemCount - 1, mActiveItem);
targetItem = Math.max(0, targetItem);
mActiveItem = targetItem;
// Scroll so that the target child is centered
View targetView = getLinearLayout().getChildAt(targetItem);
int targetLeft = targetView.getLeft();
int childWidth = targetView.getRight() - targetLeft;
int width = getWidth() - getPaddingLeft() - getPaddingRight();
int targetScroll = targetLeft - ((width - childWidth) / 2);
super.smoothScrollTo(targetScroll, 0);
}
/**
* Sets the current item and centers it.
* #param currentItem The new current item.
*/
public void setCurrentItemAndCenter(int currentItem) {
mActiveItem = currentItem;
scrollToActiveItem();
}
}

Implementing OnTouchListener on LinearLayout - Android Development

public class UnitConverterActivity extends Activity implements OnTouchListener {
/** Called when the activity is first created. */
LinearLayout mLinearLayout;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mLinearLayout = new LinearLayout(this);
ImageView i = new ImageView(this);
i.setImageResource(R.drawable.mainmenu);
//i.setAdjustViewBounds(false);
i.setScaleType(ScaleType.FIT_XY);
i.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mLinearLayout.addView(i);
setContentView(mLinearLayout);
//setContentView(R.layout.main);
}
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
return false;
}
}
I have used the above method to load an image for the main menu I am trying to create. The image has four areas and each will be used to call a particular function of the app. Now I am trying to implement touch interface on those areas. I know how to define the range of pixels for that purpose but I am at loss on how to implement OnTouchListner on the image. Please help me in this regard.

If your image was split into four rectangular quarters (say)
then in onCreate have:
i.setOnTouchListener(this);
and for your listener, something like this (illustrates the principle only):
#Override
public boolean onTouch(View v, MotionEvent mev) {
int width = v.getWidth();
int height = v.getHeight();
float x = mev.getX();
float y = mev.getY();
String msg;
if (x < width / 2) {
if (y < height / 2)
msg = "Top left quarter";
else
msg = "Bottom left quarter";
} else {
if (y < height / 2)
msg = "Top right quarter";
else
msg = "Bottom right quarter";
}
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
return false;
}

Just put this code in onCreate().
i.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//your code
}
}

Make a scrollView autoscroll with drag and drop in Android

I searched all over, but could not find a solution.
I have a view (lets call it myView) inside a scrollview. myView is bigger than the screen. Since I'm able to get the relative x,y position of my finger inside myView, I would like to make the scrollView autoscroll to the top/bottom when my finger enters a certain top/bottom threshold.
I have some ideas, namely translating the drag location to the screen position but this did not solve this problem.
thanks in advance
cheers

All right I figured it out by myself.
First I had to extend the ScrollView class and added an interface OnScrollViewListener.
public class MyScrollView extends ScrollView {
private OnScrollViewListener mListener;
public MyScrollView(Context c, AttributeSet attrs) {
super(c, attrs);
}
#Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (mListener != null) {
mListener.onScrollChanged((OnScrollViewListener) this);
}
}
public void setOnScrollViewListener(OnScrollViewListener listener) {
mListener = listener;
}
public static interface OnScrollViewListener {
public void onScrollChanged(OnScrollViewListener listener);
}
}
Next in my Activity I inserted a member mScrollDistance that indicates the amount of
pixels the user scrolls.
public class ScrollActivity extends Activity {
private int mScrollDistance;
#Override
protected void OnCreate(...) {
...
final MyScrollView myScrollView = (MyScrollView) findViewById(R.id.scroll_view);
myScrollView.setOnScrollViewListener(new MyScrollView.OnScrollViewListener() {
public void onScrollChanged(OnScrollViewListener listener) {
mScrollDistance = listener.getScrollY();
}
}
// making an drag and drop in an view that is inside the MyScrollView
final LinearLayout myLayout = (LinearLayout)findViewById(R.id.linear_layout);
myLayout.setOnDragListener(new View.OnDragListener() {
public boolean onDrag (View v, DragEvent event) {
int action = event.getAction();
switch(action) {
case DragEvent.ACTION_DRAG_STARTED: {
}
case DragEvent.ACTION_DRAG_LOCATION: {
int y = Math.round(event.getY());
int translatedY = y - mScrollDistance;
int threshold = 50;
// make a scrolling up due the y has passed the threshold
if (translatedY < threshold) {
// make a scroll up by 30 px
myScrollView.scrollBy(0, -30);
}
// make a autoscrolling down due y has passed the 500 px border
if (translatedY + threshold > 500) {
// make a scroll down by 30 px
myScrollView.scrollBy(0, 30);
}
// listen for more actions here
// ...
}
}
}
}
Now, mScrollDistance gets always a new value and the drag location will be translated to the view location.
I tested this and it works on layouts/views that are bigger than the screen size.
Hope that helps.

I came up with a different solution and I am happy with it.
I want to be able to drag and drop views inside a ScrollView. The ScrollView then needs to scroll up and down automatically when the shadow reaches the edges of the scroll view.
I ended up with a solution that detects wether the drop zone is completely visible inside the scrollview (with a 100px margin) and adjust the scroll view otherwise.
#Override
public boolean onDrag(View view, DragEvent event) {
MainWidget dropZoneView = (MainWidget) view;
int action = event.getAction();
switch (action) {
case DragEvent.ACTION_DRAG_STARTED:
//(... other stuff happens here)
case DragEvent.ACTION_DRAG_LOCATION:
ScrollView mainScrollView = (ScrollView) findViewById(R.id.main_scroll);
int topOfDropZone = dropZoneView.getTop();
int bottomOfDropZone = dropZoneView.getBottom();
int scrollY = mainScrollView.getScrollY();
int scrollViewHeight = mainScrollView.getMeasuredHeight();
Log.d(LOG_TAG,"location: Scroll Y: "+ scrollY + " Scroll Y+Height: "+(scrollY + scrollViewHeight));
Log.d(LOG_TAG," top: "+ topOfDropZone +" bottom: "+bottomOfDropZone);
if (bottomOfDropZone > (scrollY + scrollViewHeight - 100))
mainScrollView.smoothScrollBy(0, 30);
if (topOfDropZone < (scrollY + 100))
mainScrollView.smoothScrollBy(0, -30);
break;
default:
break;
}
return true;
}
Hope this helps!

I used a timer in In C#
ScrollCalendar ScrollCalendar = new ScrollCalendar (yourScrollView);
Inside the drag event
public bool OnDrag (View v, DragEvent e)
{
var dragshadow = new EventDateDragShadow (v);
switch (e.Action) {
case DragAction.Started:
return true;
case DragAction.Entered:
break;
case Android.Views.DragAction.Location:
if (e.GetY () < 90) {
ScrollCalendar.StartScroll (-15);
} else if (e.GetY () > yourScrollView.Height - 90) {
ScrollCalendar.StartScroll (15);
} else
ScrollCalendar.StopScroll ();
return (true);
case DragAction.Exited:
return true;
case DragAction.Drop:
return true;
case DragAction.Ended:
ScrollCalendar.StopScroll ();
v.SetOnDragListener (null);
return true;
}
return true;
}
The ScrollCalendar class
public class ScrollCalendar
{
private ScrollView Calendar;
private System.Timers.Timer Timer;
private int ScrollDistance;
public ScrollCalendar(ScrollView calendar)
{
Calendar = calendar;
Timer = new System.Timers.Timer();
Timer.Elapsed+=new ElapsedEventHandler(Scroll);
Timer.Interval = 50;
}
public void StartScroll(int scrollDistance)
{
if (Timer.Enabled) {
return;
}
ScrollDistance = scrollDistance;
Timer.Enabled = true;
}
public void StopScroll()
{
Timer.Enabled = false;
}
private void Scroll(object source, ElapsedEventArgs e)
{
Calendar.SmoothScrollBy (0, ScrollDistance);
}
}
Change the StartScroll value and the Timer.Interval to adjust the speed of the scroll.

I have modified answer of Tiago A.
I faced the same problem and the solution from Tiago A was small and easy but have some limitation so if others require this may help.
Thanks to Tiago A.
case DragEvent.ACTION_DRAG_LOCATION:
ScrollView myScrollView =findViewById(R.id.myScrollView);
int topOfDropZone = myScrollView.getChildAt(0).getTop();
int bottomOfDropZone = myScrollView.getChildAt(0).getBottom();
int scrollY = myScrollView.getScrollY();
int scrollViewHeight = myScrollView.getMeasuredHeight();
if (Math.round(event.getY()) > scrollViewHeight - (scrollViewHeight / 45))
if (bottomOfDropZone > (scrollY + scrollViewHeight - 100))
myScrollView.smoothScrollBy(0, 30);
if (Math.round(event.getY()) < (scrollViewHeight / 45))
if (topOfDropZone < (scrollY + 100))
myScrollView.smoothScrollBy(0, -30);
return true;