Develop Reference

Resizing a view based on the distance between start drag and end drag

I am working on a project where I have a view, which, once clicked, instantiates a class, passing the view to the constructor, which creates 4 anchor points on to the view. This is done using the following:
customView = new CustomView(MainActivity.this, viewCounter,
customView.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Resizer resizer = new Resizer(MainActivity.this, MainActivity.this, container, customView, lblStatus);
}
});
The resizer class is as follows:
public Resizer(Context context, AppCompatActivity activity, ViewGroup container, ViewGroup viewToBeResized, TextView lblStatus)
{
this.context = context;
this.activity = activity;
this.container = container;
this.viewToBeResized = viewToBeResized;
this.lblStatus = lblStatus;
createAnchorPoints();
}
private void createAnchorPoints()
{
Drawable circle = ContextCompat.getDrawable(context, R.drawable.anchor);
int circleSize = dpToPx(CIRCLE_SIZE_DP);
Anchor topLeftAnchor = new Anchor(context, viewToBeResized, Anchor.ResizeMode.TOP_LEFT, lblStatus);
topLeftAnchor.setImageDrawable(circle);
RelativeLayout.LayoutParams topLeftParms = new RelativeLayout.LayoutParams(circleSize, circleSize);
topLeftParms.addRule(RelativeLayout.ALIGN_PARENT_START, viewToBeResized.getId());
topLeftParms.addRule(RelativeLayout.ALIGN_PARENT_TOP, viewToBeResized.getId());
viewToBeResized.addView(topLeftAnchor, topLeftParms);
Anchor topRightAnchor = new Anchor(context, viewToBeResized, Anchor.ResizeMode.TOP_RIGHT, lblStatus);
topRightAnchor.setImageDrawable(circle);
RelativeLayout.LayoutParams topRightParms = new RelativeLayout.LayoutParams(circleSize, circleSize);
topRightParms.addRule(RelativeLayout.ALIGN_PARENT_END, viewToBeResized.getId());
topRightParms.addRule(RelativeLayout.ALIGN_PARENT_TOP, viewToBeResized.getId());
viewToBeResized.addView(topRightAnchor, topRightParms);
Anchor bottomLeftAnchor = new Anchor(context, viewToBeResized, Anchor.ResizeMode.BOTTOM_RIGHT, lblStatus);
bottomLeftAnchor.setImageDrawable(circle);
RelativeLayout.LayoutParams bottomLeftParms = new RelativeLayout.LayoutParams(circleSize, circleSize);
bottomLeftParms.addRule(RelativeLayout.ALIGN_PARENT_START, viewToBeResized.getId());
bottomLeftParms.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, viewToBeResized.getId());
viewToBeResized.addView(bottomLeftAnchor, bottomLeftParms);
Anchor bottomRightAnchor = new Anchor(context, viewToBeResized, Anchor.ResizeMode.BOTTOM_RIGHT, lblStatus);
bottomRightAnchor.setImageDrawable(circle);
RelativeLayout.LayoutParams bottomRightParms = new RelativeLayout.LayoutParams(circleSize, circleSize);
bottomRightParms.addRule(RelativeLayout.ALIGN_PARENT_END, viewToBeResized.getId());
bottomRightParms.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, viewToBeResized.getId());
viewToBeResized.addView(bottomRightAnchor, bottomRightParms);
}
In the anchor class that gets created at each corner, a touch listener is used. What I am trying to do is as the user drags the anchor view, the main view, that is passed into the anchor, will resize in the direction the user dragged.
Below is my touch listener
public class AnchorTouchListener implements View.OnTouchListener
{
private int _xDelta;
private int _yDelta;
private View viewToResize;
private TextView lblStatus;
private Anchor.ResizeMode resizeMode;
public AnchorTouchListener(View viewToResize, TextView lblStatus, Anchor.ResizeMode resizeMode)
{
this.viewToResize = viewToResize;
this.lblStatus = lblStatus;
this.resizeMode = resizeMode;
}
#Override
public boolean onTouch(View view, MotionEvent event)
{
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
Log.d("Anchor", "Updating X & Y");
int diff = 0;
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
lblStatus.setText("Moving down");
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
lblStatus.setText("Drag finished");
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
lblStatus.setText("Moving around");
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = _xDelta - X;
layoutParams.bottomMargin = _yDelta - Y;
view.setLayoutParams(layoutParams);
//viewToResize.animate().scaleX(0.6f);
if (resizeMode == Anchor.ResizeMode.BOTTOM_RIGHT)
{
diff = diff - X - _xDelta;
Log.d("Anchor Touch", "Diff: " + diff);
if (diff > 0)
{
((RelativeLayout.LayoutParams) viewToResize.getLayoutParams()).width = viewToResize.getLayoutParams().width + Math.abs(diff);
}
else
{
((RelativeLayout.LayoutParams)viewToResize.getLayoutParams()).width = viewToResize.getLayoutParams().width - Math.abs(diff);
}
}
break;
}
return true;
}
}
It is kind of working, except its not moving smoothly with the anchor, the view being resized seems to grow quicker than what is being dragged and is very erratic at how it resize and shrinks.
Is there a better way for doing what I am trying to achieve or can anyone see what I might be doing wrong.
UPDATE
Added video to show what I am trying to achieve and what the problem is.

Since the anchors are positioned with a RelativeLayout, there is no need to write code to move the anchors. Simply resize the grey box and the anchors will be positioned correctly upon layout. The size of the grey box can be determined by capturing initial conditions of the pointer placement and the initial size of the box to achieve the following.
I have only implemented the bottom right anchor and I have taken some liberties with your implementation, but the concept is still valid for your code and the other anchor points.
AnchorTouchListener.java
public class AnchorTouchListener implements View.OnTouchListener {
private int _xDelta;
private int _yDelta;
private View viewToResize;
private TextView lblStatus;
// private Anchor.ResizeMode resizeMode;
public AnchorTouchListener(View viewToResize, TextView lblStatus/*, Anchor.ResizeMode resizeMode*/) {
this.viewToResize = viewToResize;
this.lblStatus = lblStatus;
// this.resizeMode = resizeMode;
}
private int initialHeight;
private int initialWidth;
private int initialX;
private int initialY;
#Override
public boolean onTouch(View view, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
Log.d("Anchor", "Updating X & Y");
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
lblStatus.setText("Action down");
// Capture initial conditions of the view to resize.
initialHeight = viewToResize.getHeight();
initialWidth = viewToResize.getWidth();
// Capture initial touch point.
initialX = X;
initialY = Y;
break;
case MotionEvent.ACTION_UP:
lblStatus.setText("Drag finished");
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
lblStatus.setText("Moving around");
RelativeLayout.LayoutParams lp =
(RelativeLayout.LayoutParams) viewToResize.getLayoutParams();
// Compute how far we have moved in the X/Y directions.
_xDelta = X - initialX;
_yDelta = Y - initialY;
// Adjust the size of the targeted view. Note that we don't have to position
// the resize handle since it will be positioned correctly due to the layout.
lp.width = initialWidth + _xDelta;
lp.height = initialHeight + _yDelta;
viewToResize.setLayoutParams(lp);
break;
}
return true;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Drawable circle = ContextCompat.getDrawable(this, R.drawable.circle);
ImageView imageView = new ImageView(this);
imageView.setImageDrawable(circle);
int circleSize = dpToPx(CIRCLE_SIZE_DP);
RelativeLayout viewToBeResized = findViewById(R.id.customView);
ImageView bottomRightAnchor = new ImageView(this);
bottomRightAnchor.setImageDrawable(circle);
RelativeLayout.LayoutParams bottomRightParms =
new RelativeLayout.LayoutParams(circleSize, circleSize);
bottomRightParms.addRule(RelativeLayout.ALIGN_PARENT_END, viewToBeResized.getId());
bottomRightParms.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, viewToBeResized.getId());
viewToBeResized.addView(bottomRightAnchor, bottomRightParms);
bottomRightAnchor.setOnTouchListener(
new AnchorTouchListener(viewToBeResized, ((TextView) findViewById(R.id.status))));
}
private int dpToPx(int dp) {
return (int) (dp * getResources().getDisplayMetrics().density);
}
private static final int CIRCLE_SIZE_DP = 20;
}
activity_main.xml
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<RelativeLayout
android:id="#+id/customView"
android:layout_width="150dp"
android:layout_height="150dp"
android:background="#android:color/holo_green_light" />
<TextView
android:id="#+id/status"
android:layout_width="wrap_content"
tools:text="Status"
android:layout_height="wrap_content" />
</RelativeLayout>

RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
In above line of code in your AnchorTouchListener class you are getting the params of the view endpoint you created earlier.
Getting the correct LayourParams should solve the problem.

How to move Image (inside a Imageview) corresponding to touch pointer?

I'm new to building apps on Android. I do have Java and android studio working experience, and build basic android apps but the project I'm working on now is a little bit complicated.
I want to move a image inside a imageview corresponding to touch pointer, in other words to direction of touch but inside a specific area(circular).
Just like in android app pou i.e. pou eyes move corresponding to touch pointer.
I started with below code:
public class TouchActivity extends Activity {
private ViewGroup mainLayout;
private ImageView image;
private int xDelta;
private int yDelta;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_touch);
mainLayout = (RelativeLayout) findViewById(R.id.main);
image = (ImageView) findViewById(R.id.image);
image.setOnTouchListener(onTouchListener());
}
private OnTouchListener onTouchListener() {
return new OnTouchListener() {
#SuppressLint("ClickableViewAccessibility")
#Override
public boolean onTouch(View view, MotionEvent event) {
final int x = (int) event.getRawX();
final int y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams)
view.getLayoutParams();
xDelta = x - lParams.leftMargin;
yDelta = y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
Toast.makeText(TouchActivity.this,
"thanks for new location!", Toast.LENGTH_SHORT)
.show();
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view
.getLayoutParams();
layoutParams.leftMargin = x - xDelta;
layoutParams.topMargin = y - yDelta;
layoutParams.rightMargin = 0;
layoutParams.bottomMargin = 0;
view.setLayoutParams(layoutParams);
break;
}
mainLayout.invalidate();
return true;
}
};
}
}
... and successfully managed to move an image corresponding to touch pointer but I want to implement something like this:
(eyes are moving according to touch but inside a specific area)
Any ideas?

(by kalu) Move click image inside imageview ajust height or with depends the size of resource(image) and translate x or y direction.
Try This:
// your image view
ImageView mCoverView = findViewById(R.id.imageview);
Glide.with(aActivity).load(cover) //set img url
.asBitmap()
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(new BitmapImageViewTarget(mCoverView) {
#Override
protected void setResource(Bitmap resource) {
final Bitmap f_res = resource;
// just if you want change for a drawable res
// final Bitmap f_res = BitmapFactory.decodeResource(aActivity.getResources(),R.drawable.ic_ampliada);
//k ajust center but ajust height or with depend the image
mCoverView.setScaleType(ImageView.ScaleType.CENTER_CROP);
mCoverView.setImageBitmap(f_res);
final String dir;
if(f_res.getWidth()>f_res.getHeight())
dir="x";
else
dir="y";
mCoverView.setOnClickListener(new View.OnClickListener() {
// size of move
int value = 25;
double resh=f_res.getHeight();
double resw=f_res.getWidth();
double coverh =mCoverView.getHeight();
double coverw = mCoverView.getWidth();
int xTranslate = 0;
double sacale_w_from_h = coverh / resh * resw;
//k wtotal distancia do centro as bordas (x=0 (centro imagem))
double wtotal = (sacale_w_from_h/2);
int yTranslate = 0;
double sacale_h_from_w = coverw / resw * resh;
//k wtotal distancia do centro as bordas (y=0 (centro imagem))
double htotal = sacale_h_from_w / 2;
#Override
public void onClick(View v) {
if (dir == "x"){
if (xTranslate>wtotal || xTranslate<-wtotal)
value=-value;
xTranslate += value;
}else if(dir == "y"){
if (yTranslate>htotal || yTranslate<-htotal)
value=-value;
yTranslate += value;
}
this.translateImage(xTranslate,yTranslate);
}
private void translateImage(int xTranslate, int yTranslate)
{
Bitmap translateBitmap = Bitmap.createBitmap(f_res.getWidth() + xTranslate, f_res.getHeight() + yTranslate, f_res.getConfig());
Canvas translateCanvas = new Canvas(translateBitmap);
Matrix translateMatrix = new Matrix();
translateMatrix.setTranslate(xTranslate, yTranslate);
Paint paint = new Paint();
translateCanvas.drawBitmap(f_res, translateMatrix, paint);
mCoverView.setImageBitmap(translateBitmap);
}
});
}
#Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
if (glideAnimation == null || !glideAnimation.animate(resource, this)) {
setResource(resource);
}
}
});
//-------------------------------------------------------------------

Android - method isn't being repeatedly excuted

I created a method for changing the position of an ImageView, based on the position of other Image.
public void move(double zx, double zy) {
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(80,80);
// the imageView s was initialized in the onCreate()
System.out.println("working");
if (zx < s.getLeft()) {
if (s.getLeft() - zx > 0) {
params.leftMargin = s.getLeft() -1;
} else
params.leftMargin = s.getLeft() +1;
}
if (zx > s.getLeft()) {
if (s.getLeft() - zx > 0) {
params.leftMargin = s.getLeft() -1;
} else
params.leftMargin = s.getLeft() +1;
}
if (zy > s.getTop()) {
if (s.getTop() - zy > 0) {
params.topMargin = s.getTop() -1;
} else
params.topMargin = s.getTop() + 1;
}
if (zy < (int)s.getY()) {
if ((int)s.getY() - zy > 0) {
params.topMargin = s.getTop() -1;
} else
params.topMargin = s.getTop() + 1;
}
s.setLayoutParams(params);
}
Then I called in the onCreate()
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fase);
s = (ImageView)findViewById(R.id.s);
box = (ImageView)findViewById(R.id.box);
move(box.getLeft(),box.getTop());
}
The message "working" was printed, but only once. The imageview's position also didn't change. My conclusion is that the method wasn't executed repeatedly. Otherwise, the imageView's position would be changing every time, and the message "working" would appear each instant. How can I solve it? Should I call the method in other class? I tried to call it in a timertask and execute the timertask each milisecond, but tha application just stopped.
Drag command for the other ImageView (inside oncreate):
box.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
LayoutParams layoutParams = (LayoutParams) box.getLayoutParams();
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
System.out.println(box.getLeft());
int x_cord = (int)event.getRawX();
int y_cord = (int)event.getRawY();
if(x_cord>windowwidth){x_cord=windowwidth;}
if(y_cord>windowheight){y_cord=windowheight;}
layoutParams.leftMargin = x_cord - 250;
layoutParams.topMargin = y_cord - 300;
box.setLayoutParams(layoutParams);
break;
default:
break;
}
return true;
}
});

First, you never told your program to execute your method move more than once when onCreate is called. Second timertask each milisecond.. i think this will be way to much executing move 1000 times each second .. and third using timertask can lead to many Problems, you can use handler instead for example.
Have a look at this, it shows you how to implement a handler for repeating Tasks!

how to get the particular sub view id from the view in android?

I created a dynamic view that contains FrameLayout, and it contains ImageViews. Now, when I touch the particular image on frame layout, I want know the ID of the ImageView.
So, here are my questions:
How can I set the ID for the ImageView?
How can I recognize particular ImageView is touched?
Here is the sample snippet of the code:
for (int j = 0; j < _pageslist.size(); j++) {
FrameLayout frame = new FrameLayout(HLActivity.this);
LayoutParams params = new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
frame.setLayoutParams(params);
ImageView mainimage = new ImageView(HLActivity.this);
mainimage.setImageBitmap(ReusableMethods.getBitmapFromURL(_pageslist.get(j)
.getThumbnail().toString()));
mainimage.setScaleType(ScaleType.FIT_XY);
mainimage.setLayoutParams(params);
frame.addView(mainimage, params);
if (_pageslist.get(j).isHasspots()) {
System.out.println(_pageslist.get(j).isHasspots());
System.out.println(_pageslist.get(j).getSPOTS());
ArrayList<Hotspot> hotspots_array = _pageslist.get(j).getSPOTS();
for (int i = 0; i < hotspots_array.size(); i++) {
Hotspot hotspot = hotspots_array.get(i);
System.out.println("hotspot :: " + hotspot.getType());
ImageView spotimage = new ImageView(HLActivity.this);
spotimage.setBackgroundColor(Color.parseColor("#88676767"));
float startx, starty, endx, endy;
startx = (float) (Float.parseFloat(hotspot.getX()) * ivw) / 100;
starty = (float) (Float.parseFloat(hotspot.getY()) * ivh) / 100;
endx = (float) ((Float.parseFloat(hotspot.getX()) +
Float.parseFloat(hotspot.getWidth())) * ivw) / 100;
endy = (float) ((Float.parseFloat(hotspot.getY()) +
Float.parseFloat(hotspot.getHeight())) * ivh) / 100;
params = new FrameLayout.LayoutParams(
(int) ((Float.parseFloat(hotspot.getWidth()) * ivw)/100),
(int) ((Float.parseFloat(hotspot.getHeight()) * ivh)/100));
params.leftMargin = (int) startx;
params.topMargin = (int) starty;
frame.addView(spotimage, params);
}
}
_view.add(frame);
}
adapter = new ViewPagerAdapter(HLActivity.this, _view,
_pageslist, ivw, ivh, getStatusBarHeight());
viewPager.setAdapter(adapter);

you have to set ontouch listener to your image:
yourImage.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent arg1) {
// this is your id you can pass it
v.getId()
// TODO Auto-generated method stub
return false;
}
});

If you only want to identify the view which is touched, you can add listeners to your dynamic image views also. Like below
spotimage.setOnClickListener(new OnClickListener() {`
#Override
public void onClick(View v) {
}
});
and in the onClick methord you can write code specific to each image view, or if you strictly want to set the id for image views, you can use spotimage.setId(1)
Id can be any integer value, but you have to make sure no conflict will occur with other id values. and in any listener like OnClickListenet, you can check the image view id byint temp = view.getId();

Adding natural dragging effect to ImageView same as Facebook Messanger chat heads using Rebound library

I am developing one app where I am dragging around my ImageView in Activity.
I have configured Facebook Rebound library for spring animation which is originally used in Facebook Messenger's chat heads animations. I want to add this kind of animations to my ImageView when I drag it.
VIDEO
So far I am able to get spring animation when I touch ImageView (implemented spring on rootview), this is my code. How can I implement that natural type of dragging effect to my ImageView.
public class MainTry extends Activity {
int windowwidth;
int windowheight;
private LayoutParams layoutParams;
private final BaseSpringSystem mSpringSystem = SpringSystem.create();
private FrameLayout mRootView;
private Spring spring;
private View mImageView;
private VelocityTracker velocity = null;
private float dx;
private float dy;
private View rootView;
private ImageView img;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
// Create a system to run the physics loop for a set of springs.
SpringSystem springSystem = SpringSystem.create();
// Add a spring to the system.
spring = springSystem.createSpring();
rootView = getWindow().getDecorView()
.findViewById(android.R.id.content);
windowwidth = getWindowManager().getDefaultDisplay().getWidth();
windowheight = getWindowManager().getDefaultDisplay().getHeight();
img = (ImageView) findViewById(R.id.imageView2);
rootView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// spring.setEndValue(1);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
// spring.setEndValue(0);
break;
}
return true;
}
});
// Add a listener to observe the motion of the spring.
spring.addListener(new SimpleSpringListener() {
#Override
public void onSpringUpdate(Spring spring) {
// You can observe the updates in the spring
// state by asking its current value in onSpringUpdate.
float value = (float) spring.getCurrentValue();
float scale = .5f - (value * 0.1f);
img.setScaleX(scale);
img.setScaleY(scale);
}
});
// spring.setEndValue(1);
img.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
LayoutParams layoutParams = (LayoutParams) img
.getLayoutParams();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
dx = event.getRawX() - 10;
dy = event.getRawY() - 10;
if (velocity == null) {
// Retrieve a new VelocityTracker object to watch the
// velocity of a motion.
velocity = VelocityTracker.obtain();
} else {
// Reset the velocity tracker back to its initial state.
velocity.clear();
}
break;
case MotionEvent.ACTION_MOVE:
dx = event.getRawX() - 10;
dy = event.getRawY() - 10;
velocity.addMovement(event);
spring.setVelocity(velocity.getYVelocity());
spring.setCurrentValue(dy);
spring.setEndValue(dy);
layoutParams.leftMargin = (int) dx - 10;
layoutParams.topMargin = (int) dy - 10;
img.setLayoutParams(layoutParams);
break;
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_UP:
velocity.addMovement(event);
spring.setVelocity(velocity.getYVelocity());
spring.setCurrentValue(event.getRawY() - 10);
spring.setEndValue(0);
break;
default:
break;
}
return true;
}
});
}
#Override
public void onResume() {
super.onResume();
}
#Override
public void onPause() {
super.onPause();
}
}

what about this:
class V extends View implements SpringListener {
private static final int NUM_ELEMS = 4;
private Spring[] mXSprings = new Spring[NUM_ELEMS];
private Spring[] mYSprings = new Spring[NUM_ELEMS];
private Paint mPaint = new Paint();
private Bitmap mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
public V(Context context) {
super(context);
SpringSystem ss = SpringSystem.create();
Spring s;
for (int i = 0; i < NUM_ELEMS; i++) {
s = ss.createSpring();
s.setSpringConfig(new MySpringConfig(200, i == 0? 8 : 15 + i * 2, i, true));
s.addListener(this);
mXSprings[i] = s;
s = ss.createSpring();
s.setSpringConfig(new MySpringConfig(200, i == 0? 8 : 15 + i * 2, i, false));
s.addListener(this);
mYSprings[i] = s;
}
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mXSprings[0].setCurrentValue(w / 2);
mYSprings[0].setCurrentValue(0);
mXSprings[0].setEndValue(w / 2);
mYSprings[0].setEndValue(h / 2);
}
#Override
public void onSpringActivate(Spring s) {
}
#Override
public void onSpringAtRest(Spring s) {
}
#Override
public void onSpringEndStateChange(Spring s) {
}
#Override
public void onSpringUpdate(Spring s) {
MySpringConfig cfg = (MySpringConfig) s.getSpringConfig();
if (cfg.index < NUM_ELEMS - 1) {
Spring[] springs = cfg.horizontal? mXSprings : mYSprings;
springs[cfg.index + 1].setEndValue(s.getCurrentValue());
}
if (cfg.index == 0) {
invalidate();
}
}
#Override
public boolean onTouchEvent(MotionEvent event) {
mXSprings[0].setEndValue(event.getX());
mYSprings[0].setEndValue(event.getY());
return true;
}
#Override
protected void onDraw(Canvas canvas) {
for (int i = NUM_ELEMS - 1; i >= 0; i--) {
mPaint.setAlpha(i == 0? 255 : 192 - i * 128 / NUM_ELEMS);
canvas.drawBitmap(mBitmap,
(float) mXSprings[i].getCurrentValue() - mBitmap.getWidth() / 2,
(float) mYSprings[i].getCurrentValue() - mBitmap.getHeight() / 2,
mPaint);
}
}
class MySpringConfig extends SpringConfig {
int index;
boolean horizontal;
public MySpringConfig(double tension, double friction, int index, boolean horizontal) {
super(tension, friction);
this.index = index;
this.horizontal = horizontal;
}
}
}

i have used above V class directly in Window-manager and it's work perfectly and chatHead move like facebook messenger.
public class ChatHeadService extends Service
{
private LayoutInflater inflater;
private WindowManager windowManager;
private Point szWindow = new Point();
#Override
public void onCreate()
{
super.onCreate();
Log.v(Utils.LogTag, "Start Service");
}
private
void handleStart(){
windowManager = (WindowManager)getSystemService(WINDOW_SERVICE);
inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
if (Build . VERSION . SDK_INT >= Build . VERSION_CODES . HONEYCOMB) {
windowManager . getDefaultDisplay() . getSize(szWindow);
} else {
int w = windowManager . getDefaultDisplay() . getWidth();
int h = windowManager . getDefaultDisplay() . getHeight();
szWindow . set(w, h);
}
WindowManager . LayoutParams params = new WindowManager . LayoutParams(
WindowManager . LayoutParams . WRAP_CONTENT,
WindowManager . LayoutParams . WRAP_CONTENT,
WindowManager . LayoutParams . TYPE_PHONE,
WindowManager . LayoutParams . FLAG_NOT_FOCUSABLE |
WindowManager . LayoutParams . FLAG_WATCH_OUTSIDE_TOUCH |
WindowManager . LayoutParams . FLAG_LAYOUT_NO_LIMITS,
PixelFormat . TRANSLUCENT
);
params . gravity = Gravity . TOP | Gravity . LEFT;
params . x = 50;
params . y = 100;
V vImg = new V(this);
windowManager . addView(vImg, params);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null) {
if (startId == Service . START_STICKY) {
handleStart();
}
}
return super . onStartCommand(intent, flags, startId);
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onDestroy(){
super . onDestroy();
if (windowManager != null) {
// windowManager.removeView(chatHeadView);
}
}
}