Develop Reference

Enlarge animation in android

I want to achieve the below animation in android I have tried scenes but scenes do not work with text as per docs it is confirmed :
"If you try to resize a TextView with an animation, the text will pop to a new location before the object has completely resized. To avoid this problem, do not animate the resizing of views that contain text."
Please any solution , the enlarged layout text can contain images too.
animation video

this thing worked some how ,but the animation is little jittery,I guess layout height final value is attained first and layoutWidth later, have to fix this. this is my enlarge/reduce animation :
public class EnlargeAnimation extends Animation {
private final int diffHeight;
private final int diffWidth;
private final int initialHeight;
private final int initialWidth;
private final View targetView;
public EnlargeAnimation(View targetView, float targetHeight, float targetWidth) {
this.targetView = targetView;
this.initialHeight = targetView.getMeasuredHeight();
this.initialWidth = targetView.getMeasuredWidth();
this.diffHeight = (int) (targetHeight-initialHeight);
this.diffWidth = (int) (targetWidth-initialWidth);
}
#Override
public boolean willChangeBounds() {
return true;
}
#Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
float newHeight = initialHeight + diffHeight * interpolatedTime;
float newWidth = initialWidth + diffWidth * interpolatedTime;
targetView.getLayoutParams().height = (int) newHeight;
targetView.getLayoutParams().width = (int) newWidth;
targetView.requestLayout();
}
}
this is when enlarge animation is called :
I am using viewpager so i have to make padding negative to enlarge the card size :
ValueAnimator paddingAnimator = ValueAnimator.ofInt(20, -10).setDuration(400);
paddingAnimator.setInterpolator(new LinearInterpolator());
paddingAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
int padding = (int) animation.getAnimatedValue();
view.setPadding(padding,
(int) DeviceUtils.convertDpToPx(50, v.getContext()), padding,
(int) DeviceUtils.convertDpToPx(50, v.getContext()));
view.requestLayout();
}
});
viewPagerItemSizeListener.onEnlarged();
EnlargeAnimation
enlargeAnimation =
new EnlargeAnimation(cardView, screenHeight, screenWidth);
enlargeAnimation.setDuration(400);
enlargeAnimation.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
paddingAnimator.start();
seeExampleText.setVisibility(View.INVISIBLE);
}
#Override
public void onAnimationEnd(Animation animation) {
stage.setVisibility(View.GONE);
cardEnlargedWidth = cardView.getLayoutParams().width;
cardEnlargedHeight = cardView.getLayoutParams().height;
crossContianer.setVisibility(View.VISIBLE);
detailTextContianer.setVisibility(View.VISIBLE);
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
view.startAnimation(enlargeAnimation);
I guess no one is reading it, but if something is confusing about variables let me know i will edit the answer.

MPAndroidChart - Button click in MarkerView

Currently I have a Button in a layout, however an assigned OnClickListener never calls back to the onClick method.
Is it possible to intercept the click of a Button in a layout assigned to a MarkerView?

I have finished my app with clickable marker view. My solution is that we'll create a subclass of LineChart (or other chart), then let override onTouchEvent and detect the touch location.
public class MyChart extends LineChart {
#Override
public boolean onTouchEvent(MotionEvent event) {
boolean handled = true;
// if there is no marker view or drawing marker is disabled
if (isShowingMarker() && this.getMarker() instanceof ChartInfoMarkerView){
ChartInfoMarkerView markerView = (ChartInfoMarkerView) this.getMarker();
Rect rect = new Rect((int)markerView.drawingPosX,(int)markerView.drawingPosY,(int)markerView.drawingPosX + markerView.getWidth(), (int)markerView.drawingPosY + markerView.getHeight());
if (rect.contains((int) event.getX(),(int) event.getY())) {
// touch on marker -> dispatch touch event in to marker
markerView.dispatchTouchEvent(event);
}else{
handled = super.onTouchEvent(event);
}
}else{
handled = super.onTouchEvent(event);
}
return handled;
}
private boolean isShowingMarker(){
return mMarker != null && isDrawMarkersEnabled() && valuesToHighlight();
}
}
public class ChartInfoMarkerView extends MarkerView {
#BindView(R.id.markerContainerView)
LinearLayout markerContainerView;
protected float drawingPosX;
protected float drawingPosY;
private static final int MAX_CLICK_DURATION = 500;
private long startClickTime;
/**
* The constructor
*
* #param context
* #param layoutResource
*/
public ChartInfoMarkerView(Context context, int layoutResource) {
super(context, layoutResource);
ButterKnife.bind(this);
markerContainerView.setClickable(true);
markerContainerView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.d("MARKER","click");
}
});
}
#Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
startClickTime = Calendar.getInstance().getTimeInMillis();
break;
}
case MotionEvent.ACTION_UP: {
long clickDuration = Calendar.getInstance().getTimeInMillis() - startClickTime;
if(clickDuration < MAX_CLICK_DURATION) {
markerContainerView.performClick();
}
}
}
return super.onTouchEvent(event);
}
#Override
public void draw(Canvas canvas, float posX, float posY) {
super.draw(canvas, posX, posY);
MPPointF offset = getOffsetForDrawingAtPoint(posX, posY);
this.drawingPosX = posX + offset.x;
this.drawingPosY = posY + offset.y;
}
}

Using the library it appears not to be possible, however a solution of sorts is to show a View or ViewGroup over the chart which has a Button in it. You’ll need to set up an empty layout for the MarkerView and wrap your Chart in a ViewGroup such as a RelativeLayout.
Define a listener such as this in your CustomMarkerView:
public interface Listener {
/**
* A callback with the x,y position of the marker
* #param x the x in pixels
* #param y the y in pixels
*/
void onMarkerViewLayout(int x, int y);
}
Set up some member variables:
private Listener mListener;
private int mLayoutX;
private int mLayoutY;
private int mMarkerVisibility;
In your constructor require a listener:
/**
* Constructor. Sets up the MarkerView with a custom layout resource.
* #param context a context
* #param layoutResource the layout resource to use for the MarkerView
* #param listener listens for the bid now click
*/
public SQUChartMarkerView(Context context, int layoutResource, Listener listener) {
super(context, layoutResource);
mListener = listener;
}
Store the location the marker should be when the values are set:
#Override public int getXOffset(float xpos) {
mLayoutX = (int) (xpos - (getWidth() / 2));
return -getWidth() / 2;
}
#Override public int getYOffset(float ypos) {
mLayoutY = (int) (ypos - getWidth());
return -getHeight();
}
Then override onDraw to determine when you should draw your layout:
#Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(mMarkerVisibility == View.VISIBLE) mListener.onMarkerViewLayout(mLayoutX, mLayoutY);
}
I added an option to change the state of the marker:
public void setMarkerVisibility(int markerVisibility) {
mMarkerVisibility = markerVisibility;
}
Where you listen for marker being laid out, get your layout (eg. inflate it or you may have it as a member variable), make sure you measure it, then set the margins. In this case I am using getParent() as the chart and the layout for the marker share the same parent. I have a BarChart so my margins may be different from yours.
#Override public void onMarkerViewLayout(int x, int y) {
if(getParent() == null || mChartListener.getAmount() == null) return;
// remove the marker
((ViewGroup) getParent()).removeView(mMarkerLayout);
((ViewGroup) getParent()).addView(mMarkerLayout);
// measure the layout
// if this is not done, the first calculation of the layout parameter margins
// will be incorrect as the layout at this point has no height or width
int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(((ViewGroup) getParent()).getWidth(), View.MeasureSpec.UNSPECIFIED);
int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(((ViewGroup) getParent()).getHeight(), View.MeasureSpec.UNSPECIFIED);
mMarkerLayout.measure(widthMeasureSpec, heightMeasureSpec);
// set up layout parameters so our marker is in the same position as the mpchart marker would be (based no the x and y)
RelativeLayout.LayoutParams lps = (RelativeLayout.LayoutParams) mMarkerLayout.getLayoutParams();
lps.height = FrameLayout.LayoutParams.WRAP_CONTENT;
lps.width = FrameLayout.LayoutParams.WRAP_CONTENT;
lps.leftMargin = x - mMarkerLayout.getMeasuredWidth() / 2;
lps.topMargin = y - mMarkerLayout.getMeasuredHeight();
}
Hope this helps.

Ease animation in slidingdrawer

I want to slowdown SlidingDrawer opening speed using interpolator (DecelerateInterpolator)
Is this possible. i want to implement ease animation.
final Animation slowDown = AnimationUtils.loadAnimation(((Swipe)getActivity()), R.anim.ease);
this is XML
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="#android:anim/decelerate_interpolator">
<translate
android:fromYDelta="0"
android:toYDelta="100%p"
android:duration="2000"/>
</set>
Using this i am not getting what i want.

Actually, if You want only open/close that sliding layout, than I would suggest to use custom ViewGroup instead of deprecated SlidingDrawer. Below is some simple example of that implementation:
public class MySimpleSlidingDrawer extends RelativeLayout implements View.OnClickListener {
private static final int SLIDING_TIME = 500;
private View mHandle;
private int mHandleId;
private View mContent;
private int mContentId;
private ObjectAnimator mOpenAnimator = ObjectAnimator.ofFloat(this, "slide", 0f, 1f);
private ObjectAnimator mCloseAnimator = ObjectAnimator.ofFloat(this, "slide", 1f, 0f);
private int mAnimationTime = SLIDING_TIME;
private boolean mOpened = false;
private int mSlideHeight = 0;
public MySimpleSlidingDrawer(final Context context) {
super(context);
init(context, null, 0);
}
public MySimpleSlidingDrawer(final Context context, final AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
public MySimpleSlidingDrawer(final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
init(context, attrs, defStyle);
}
private void init(final Context context, final AttributeSet attrs, final int defStyle) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MySlidingDrawer, defStyle, 0);
mHandleId = a.getResourceId(R.styleable.MySlidingDrawer_handle, 0);
mContentId = a.getResourceId(R.styleable.MySlidingDrawer_content, 0);
mOpenAnimator.setInterpolator(new AccelerateInterpolator());
mOpenAnimator.setDuration(SLIDING_TIME);
mCloseAnimator.setInterpolator(new DecelerateInterpolator());
mCloseAnimator.setDuration(SLIDING_TIME);
setClipChildren(false);
}
#Override
protected void onFinishInflate() {
super.onFinishInflate();
if (getChildCount() != 2) {
throw new InflateException("Only to child are supported for this layout");
}
if (mHandleId != 0) {
mHandle = findViewById(mHandleId);
} else {
mHandle = getChildAt(0);
}
if (mContentId != 0) {
mContent = findViewById(mContentId);
} else {
mContent = getChildAt(1);
}
final LayoutParams handleParams = (LayoutParams) mHandle.getLayoutParams();
handleParams.width = ViewGroup.LayoutParams.WRAP_CONTENT;
handleParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
handleParams.addRule(ALIGN_PARENT_BOTTOM, 1/* true */);
handleParams.addRule(CENTER_HORIZONTAL, 1/* true */);
mHandle.setLayoutParams(handleParams);
mHandle.setOnClickListener(this);
}
#Override
public void onClick(final View v) {
if (mSlideHeight == 0) {
mSlideHeight = getHeight() - mHandle.getHeight();
}
// Handle have been clicked. Execute animation depending on open / close state
if (!mOpened) {
mOpened = true;
mCloseAnimator.cancel();
mOpenAnimator.start();
} else {
mOpened = false;
mOpenAnimator.cancel();
mCloseAnimator.start();
}
}
/**
* Sets slide percent value
*
* #param slidePercent % of slide (0 - closed, 1 - opened)
*/
#SuppressWarnings("UnusedDeclaration")
public void setSlide(final float slidePercent) {
final LayoutParams handleParams = (LayoutParams) mHandle.getLayoutParams();
handleParams.bottomMargin = (int) (slidePercent * mSlideHeight);
mHandle.setLayoutParams(handleParams);
final LayoutParams contentParams = (LayoutParams) mContent.getLayoutParams();
contentParams.bottomMargin = (int) -((1- slidePercent) * mSlideHeight);
mContent.setLayoutParams(contentParams);
}
/**
* Sets open interpolator
*
* #param interpolator {#link android.view.animation.Interpolator} for open animation
*/
#SuppressWarnings("UnusedDeclaration")
public void setOpenInterpolator(final Interpolator interpolator) {
if (mOpenAnimator.isRunning()) {
mOpenAnimator.cancel();
}
mOpenAnimator.setInterpolator(interpolator);
}
/**
* Sets close interpolator
*
* #param interpolator {#link android.view.animation.Interpolator} for close animation
*/
#SuppressWarnings("UnusedDeclaration")
public void setCloseInterpolator(final Interpolator interpolator) {
if (mCloseAnimator.isRunning()) {
mCloseAnimator.cancel();
}
mCloseAnimator.setInterpolator(interpolator);
}
#Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Trick to avoid content to be resized - measure it as it visible
final int contentHeightMeasure = MeasureSpec.makeMeasureSpec(getMeasuredHeight() - mHandle.getMeasuredHeight(), MeasureSpec.EXACTLY);
final int contentWidthMeasure = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY);
mContent.measure(contentHeightMeasure, contentWidthMeasure);
if (mSlideHeight == 0) {
mSlideHeight = getMeasuredHeight() - mHandle.getMeasuredHeight();
final LayoutParams contentParams = (LayoutParams) mContent.getLayoutParams();
contentParams.height = mSlideHeight;
contentParams.addRule(ALIGN_PARENT_BOTTOM, 1 /* true */);
contentParams.bottomMargin = - mSlideHeight;
mContent.setLayoutParams(contentParams);
}
}
}
NOTE: it's not optimized or tested a lot, but basic functionality works.
Another way is to adapt existing SlidingDrawer code to your need. For me it looks not so easy or flexible, because of its existing implementation specific. First of all, it clear mentioned in SlidingDrawer documentation:
This class is not supported anymore. It is recommended you base your
own implementation on the source code for the Android Open Source
Project if you must use it in your application.
And there's no animation change API exposed by SlidingDrawer. The main problem is that there's no animation at all, some timing event is just sent to update view position, here:
private void doAnimation() {
if (mAnimating) {
incrementAnimation();
if (mAnimationPosition >= mBottomOffset + (mVertical ? getHeight() : getWidth()) - 1) {
mAnimating = false;
closeDrawer();
} else if (mAnimationPosition < mTopOffset) {
mAnimating = false;
openDrawer();
} else {
moveHandle((int) mAnimationPosition);
mCurrentAnimationTime += ANIMATION_FRAME_DURATION;
mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE),
mCurrentAnimationTime);
}
}
}
So, in order to modify interpolation, you will need to change what animation logic or provide your own. Second way is safer, because doesn't affect existing logic. Below is some draft variant how to do it (to detect exact changes comparing with original SlidingDrawer open below class diff with original API 19 version from your android SDK installation), only changed code is presented below:
public class MySlidingDrawer extends ViewGroup {
/** Click animation duration */
// TODO: ideally you should properly calculate that value
private static final long CLICK_ANIMATION_DURATION = 1000;
/** New field for custom interpolator */
private TimeInterpolator mAnimationInterpolator = new BounceInterpolator();
/** just to distinguish click and moving by user animations */
private boolean mAnimatedClick = false;
/** Specific click animator */
private ObjectAnimator mClickToggleAnimation;
/** Specific listener just to handle animation end properly */
private Animator.AnimatorListener mClickAnimationListener = new Animator.AnimatorListener() {
#Override
public void onAnimationStart(final Animator animation) {
// nothing to do here
}
#Override
public void onAnimationEnd(final Animator animation) {
mAnimating = false;
// Determine if it close or open, by comparing to some final value
if (mAnimationPosition == mTopOffset) {
openDrawer();
} else {
closeDrawer();
}
}
#Override
public void onAnimationCancel(final Animator animation) {
// TODO: should be handled properly
}
#Override
public void onAnimationRepeat(final Animator animation) {
}
};
...
/**
* Creates a new SlidingDrawer from a specified set of attributes defined in XML.
*
* #param context The application's environment.
* #param attrs The attributes defined in XML.
*/
public MySlidingDrawer(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
...
#Override
public boolean onTouchEvent(MotionEvent event) {
if (mLocked) {
return true;
}
if (mTracking) {
mVelocityTracker.addMovement(event);
final int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_MOVE:
moveHandle((int) (mVertical ? event.getY() : event.getX()) - mTouchDelta);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(mVelocityUnits);
float yVelocity = velocityTracker.getYVelocity();
float xVelocity = velocityTracker.getXVelocity();
boolean negative;
final boolean vertical = mVertical;
if (vertical) {
negative = yVelocity < 0;
if (xVelocity < 0) {
xVelocity = -xVelocity;
}
if (xVelocity > mMaximumMinorVelocity) {
xVelocity = mMaximumMinorVelocity;
}
} else {
negative = xVelocity < 0;
if (yVelocity < 0) {
yVelocity = -yVelocity;
}
if (yVelocity > mMaximumMinorVelocity) {
yVelocity = mMaximumMinorVelocity;
}
}
float velocity = (float) Math.hypot(xVelocity, yVelocity);
if (negative) {
velocity = -velocity;
}
final int top = mHandle.getTop();
final int left = mHandle.getLeft();
if (Math.abs(velocity) < mMaximumTapVelocity) {
if (vertical ? (mExpanded && top < mTapThreshold + mTopOffset) ||
(!mExpanded && top > mBottomOffset + getBottom() - getTop() -
mHandleHeight - mTapThreshold) :
(mExpanded && left < mTapThreshold + mTopOffset) ||
(!mExpanded && left > mBottomOffset + getRight() - getLeft() -
mHandleWidth - mTapThreshold)) {
if (mAllowSingleTap) {
playSoundEffect(SoundEffectConstants.CLICK);
animateToggle();
/*
if (mExpanded) {
animateClose(vertical ? top : left);
} else {
animateOpen(vertical ? top : left);
}
*/
} else {
performFling(vertical ? top : left, velocity, false);
}
} else {
performFling(vertical ? top : left, velocity, false);
}
} else {
performFling(vertical ? top : left, velocity, false);
}
}
break;
}
}
return mTracking || mAnimating || super.onTouchEvent(event);
}
...
/**
* Toggles the drawer open and close with an animation.
*
* #see #open()
* #see #close()
* #see #animateClose()
* #see #animateOpen()
* #see #toggle()
*/
public void animateToggle() {
mAnimatedClick = true;
if (!mExpanded) {
animateClickOpen();
} else {
animateClickClose();
}
}
/**
* For doing our animation for close
*/
private void animateClickClose() {
mAnimating = true;
mClickToggleAnimation = ObjectAnimator.ofInt(this, "togglePosition", (int) mAnimationPosition, mBottomOffset + (mVertical ? getHeight() : getWidth()) - 1);
mClickToggleAnimation.setInterpolator(mAnimationInterpolator);
mClickToggleAnimation.setDuration(CLICK_ANIMATION_DURATION);
mClickToggleAnimation.addListener(mClickAnimationListener);
mClickToggleAnimation.start();
}
/**
* For doing our animation for open
*/
private void animateClickOpen() {
mAnimating = true;
mClickToggleAnimation = ObjectAnimator.ofInt(this, "togglePosition", (int)mAnimationPosition, mTopOffset);
mClickToggleAnimation.setInterpolator(mAnimationInterpolator);
mClickToggleAnimation.setDuration(CLICK_ANIMATION_DURATION);
mClickToggleAnimation.addListener(mClickAnimationListener);
mClickToggleAnimation.start();
}
/**
* Sets current animation position
*
* #param position to be set
*/
#SuppressWarnings("UnusedDeclaration")
public void setTogglePosition(final int position) {
mAnimationPosition = position;
moveHandle((int) mAnimationPosition);
}
...
private class DrawerToggler implements OnClickListener {
public void onClick(View v) {
if (mLocked) {
return;
}
// mAllowSingleTap isn't relevant here; you're *always*
// allowed to open/close the drawer by clicking with the
// trackball.
if (mAnimateOnClick) {
animateToggle();
} else {
toggle();
}
}
}
...
/**
* New API to modify timing of interpolator
*
* #param interpolator {#link android.animation.TimeInterpolator} to be used for onClick open / close
*
* TODO: it's also possible to add XML attribute for the same
*/
public void setAnimationInterpolator(final TimeInterpolator interpolator) {
mAnimationInterpolator = interpolator;
}
}
And there's xml I've used for testing (only one sliding drawer section should be enabled):
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/com.alexstarc.testapp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- Some fragment with main content of activity screen -->
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.alexstarc.testapp.VoteListFragment"
android:tag="mainFragment"/>
<com.alexstarc.testapp.MySlidingDrawer
android:id="#+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
custom:handle="#+id/handle"
custom:orientation="vertical"
custom:content="#+id/content">
<ImageView
android:id="#id/handle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/ic_delete"/>
<ImageView
android:id="#id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/cover"
android:scaleType="fitXY"/>
</com.alexstarc.testapp.MySlidingDrawer>
<!--
<com.alexstarc.testapp.MySimpleSlidingDrawer
android:id="#+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
custom:handle="#+id/handle"
custom:content="#+id/content">
<ImageView
android:id="#id/handle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/ic_delete"/>
<ImageView
android:id="#id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/cover"
android:scaleType="fitXY"/>
</com.alexstarc.testapp.MySimpleSlidingDrawer>
-->
</RelativeLayout>

How to adapt coverflow/gallery to fit different screen sizes

I'm using this CoverFlow : http://www.inter-fuser.com/2010/02/android-coverflow-widget-v2.html
I want to for the coverflow to adapt to the different screen sizes,
I have modded the coverflow slightly so that I use an XML layout instead.
Here's how the layout should and looks like on my Phone (320x480)
Here's how the layout looks like on a Nexus One (480x720 in emulator)
COVERFLOW CLASS :
public class CoverFlow extends Gallery {
/**
* Graphics Camera used for transforming the matrix of ImageViews
*/
private final Camera mCamera = new Camera();
/**
* The maximum angle the Child ImageView will be rotated by
*/
private int mMaxRotationAngle = 80;
/**
* The maximum zoom on the centre Child
*/
// TODO RENDRE LA VALEUR DYNAMIQUE SUR LA TAILLE DE L'ECRAN
// private int mMaxZoom = -430;
private int mMaxZoom = -370;
/**
* The Centre of the Coverflow
*/
private int mCoveflowCenter;
public CoverFlow(Context context) {
super(context);
this.setStaticTransformationsEnabled(true);
}
public CoverFlow(Context context, AttributeSet attrs) {
super(context, attrs);
this.setStaticTransformationsEnabled(true);
}
public CoverFlow(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setStaticTransformationsEnabled(true);
}
/**
* Get the max rotational angle of the image
* #return the mMaxRotationAngle
*/
public int getMaxRotationAngle() {
return mMaxRotationAngle;
}
/**
* Set the max rotational angle of each image
* #param maxRotationAngle the mMaxRotationAngle to set
*/
public void setMaxRotationAngle(int maxRotationAngle) {
mMaxRotationAngle = maxRotationAngle;
}
/**
* Get the Max zoom of the centre image
* #return the mMaxZoom
*/
public int getMaxZoom() {
return mMaxZoom;
}
/**
* Set the max zoom of the centre image
* #param maxZoom the mMaxZoom to set
*/
public void setMaxZoom(int maxZoom) {
mMaxZoom = maxZoom;
}
/**
* Get the Centre of the Coverflow
* #return The centre of this Coverflow.
*/
private int getCenterOfCoverflow() {
return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft();
}
/**
* Get the Centre of the View
* #return The centre of the given view.
*/
private static int getCenterOfView(View view) {
return view.getLeft() + view.getWidth() / 2;
}
/**
* {#inheritDoc}
*
* #see #setStaticTransformationsEnabled(boolean)
*/
#Override
protected boolean getChildStaticTransformation(View child, Transformation t) {
final int childCenter = getCenterOfView(child);
final int childWidth = child.getWidth() ;
int rotationAngle = 0;
t.clear();
t.setTransformationType(Transformation.TYPE_MATRIX);
if (childCenter == mCoveflowCenter) {
transformImageBitmap((ImageView) child, t, 0);
} else {
rotationAngle = (int) (((float) (mCoveflowCenter - childCenter)/ childWidth) * mMaxRotationAngle);
if (Math.abs(rotationAngle) > mMaxRotationAngle) {
rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
}
transformImageBitmap((ImageView) child, t, rotationAngle);
}
return true;
}
/**
* This is called during layout when the size of this view has changed. If
* you were just added to the view hierarchy, you're called with the old
* values of 0.
*
* #param w Current width of this view.
* #param h Current height of this view.
* #param oldw Old width of this view.
* #param oldh Old height of this view.
*/
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCoveflowCenter = getCenterOfCoverflow();
super.onSizeChanged(w, h, oldw, oldh);
}
/**
* Transform the Image Bitmap by the Angle passed
*
* #param imageView ImageView the ImageView whose bitmap we want to rotate
* #param t transformation
* #param rotationAngle the Angle by which to rotate the Bitmap
*/
private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) {
mCamera.save();
final Matrix imageMatrix = t.getMatrix();;
final int imageHeight = child.getLayoutParams().height;;
final int imageWidth = child.getLayoutParams().width;
final int rotation = Math.abs(rotationAngle);
mCamera.translate(0.0f, 0.0f, 100.0f);
//As the angle of the view gets less, zoom in
if ( rotation < mMaxRotationAngle ) {
float zoomAmount = (mMaxZoom + rotation);
mCamera.translate(0.0f, 0.0f, zoomAmount);
}
mCamera.rotateY(rotationAngle);
mCamera.getMatrix(imageMatrix);
imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2));
imageMatrix.postTranslate((imageWidth/2), (imageHeight/2));
mCamera.restore();
}
}
HOME ACTIVITY :
public class HomeActivity extends Activity {
private final static String TAG = "HomeActivity";
private TextView pageNameTextView;
private CoverFlow coverFlow;
private ImageAdapter coverImageAdapter;
private int itemSelected = 0;
private Context context;
private SparseArray<String> listeNomIcons;
private int currentImagePosition = 0;
//Info button
private ImageView infoAccueilImageView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_layout);
//animate Transition
overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
context = this;
listeNomIcons = new SparseArray<String>();
listeNomIcons.put(0, "DELAIS D'ATTENTE, RETARD");
listeNomIcons.put(1, "COURRIER SUBSTITUTION");
listeNomIcons.put(2, "IR LC");
listeNomIcons.put(3, "CONTACTS UTILES");
listeNomIcons.put(4, "TEMPS DE PAUSE");
listeNomIcons.put(5, "DISPERTION");
listeNomIcons.put(6, "PRORATA REPOS");
listeNomIcons.put(7, "ALERTE DOMICILE");
listeNomIcons.put(8, "RESERVE DOMICILE");
listeNomIcons.put(9, "RADD");
listeNomIcons.put(10, "JOKER");
coverFlow = (CoverFlow)findViewById(R.id.coverflow);
coverImageAdapter = new ImageAdapter(this);
coverFlow.setAdapter(coverImageAdapter);
coverFlow.setSelection(0, true);
coverFlow.setAnimationDuration(1000);
//cover
pageNameTextView = (TextView)findViewById(R.id.page_nameTextView);
//Info Accueil Image View
infoAccueilImageView = (ImageView)findViewById(R.id.infoImageView);
infoAccueilImageView.setOnClickListener( new OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(context, InfoAccueilActivity.class));
}
} ) ;
coverFlow.setOnItemSelectedListener(new OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
currentImagePosition = position; //this will update your current marker
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Button goLeft = (Button) findViewById(R.id.select_leftButton);
goLeft.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// go to previous image
coverFlow.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, new KeyEvent(0, 0));
}
});
Button goRight = (Button) findViewById(R.id.select_rightButton);
goRight.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// go to next item
coverFlow.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, new KeyEvent(0, 0));
}
});
coverFlow.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
if(itemSelected == arg2)
{
Log.d(TAG, "arg2 : "+arg2);
switch (arg2) {
case 0:
startActivity(new Intent(context, DelaisAttenteActivity.class));
break;
case 1:
startActivity(new Intent(context, CourrierSubstitutionActivity.class));
break;
case 2:
startActivity(new Intent(context, IRLCActivity.class));
break;
case 3:
startActivity(new Intent(context, ContactsActivity.class));
break;
case 4:
startActivity(new Intent(context, TempsPauseActivity.class));
break;
case 5:
startActivity(new Intent(context, DispertionActivity.class));
break;
case 6:
startActivity(new Intent(context, ProrataReposActivity.class));
break;
case 7:
startActivity(new Intent(context, AlerteDomicileActivity.class));
break;
case 8:
startActivity(new Intent(context, ReserveDomicileActivity.class));
break;
case 9:
startActivity(new Intent(context, ReposAdditionnelActivity.class));
break;
case 10:
startActivity(new Intent(context, JokerActivity.class));
break;
default:
break;
}
}
}
});
coverFlow.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
pageNameTextView.setText(listeNomIcons.get(arg2));
itemSelected = arg2;
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private final Context mContext;
private final Integer[] mImageIds = {
R.drawable.retard_controller,
R.drawable.courrier_substitution_controller,
R.drawable.irmf_controller,
R.drawable.contacts_controller,
R.drawable.pause_controller,
R.drawable.dispersion_controller,
R.drawable.repos_controller,
R.drawable.alerte_controller,
R.drawable.reserve_domicile_controller,
R.drawable.repos_additionnel_controller,
R.drawable.joker_controller
};
private final ImageView[] mImages;
public ImageAdapter(Context c) {
mContext = c;
mImages = new ImageView[mImageIds.length];
}
#Override
public int getCount() {
return mImageIds.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//Use this code if you want to load from resources
ImageView i = new ImageView(mContext);
i.setImageResource(mImageIds[position]);
i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
//Make sure we set anti-aliasing otherwise we get jaggies
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
return i;
//return mImages[position];
}
/** Returns the size (0.0f to 1.0f) of the views
* depending on the 'offset' to the center. */
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset)));
}
}
}

I found a way around, not a great solution but it works pretty well on the devices that I have tested it on...
In the method (in the ImageAdapter in HomeActivity)
#Override
public View getView(int position, View convertView, ViewGroup parent)
there I change the size of the image on this line
i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
to
int imageSize = calculateSize();
i.setLayoutParams(new CoverFlow.LayoutParams(imageSize, imageSize));
I set imageSize in my onCreate with this method
public int calculateSize()
{
// GET SCREEN SIZE
Display display = getWindowManager().getDefaultDisplay();
// HEIGHT
int height = display.getHeight();
long roundedHeightSize = Math.round((0.2132*height)+27.177);
//WIDTH
int width = display.getWidth();
long roundedWidthSize = Math.round((0.4264*width)-6.9355);
return (int)((roundedHeightSize+roundedWidthSize)/2);
}
TO GET THE FUNCTION :
(0.2132*height)+27.177 & (0.4264*width)-6.9355
I tested manually the height of the image needed on the different devices I had available
Galaxy SIII : 300 (1280x720)
Xperia Mini Pro : 135 (480x320)
Xperia X10 Mini Pro : 95 (320x240)
f(1280)=300
f(480)=135
f(320)=95
f(x) = 0.2132X + 27.177
then I did the same as the width..
I then get the average of the height and width given from these two functions to get the best value for the height and width of the image (seeing as the image is square => width = height)

there is a alphaSpacing kind of int variable, just increase its value . however i can not not remember exact class and variable name as its almost 2 years, when i used this code . but yes, one thing i remember is that i came across very same issue and i had absolutely no idea about stackoverflow. so was trying with different values and eventually succeeded .

I suggested to use values from dimens.xml. As example in the getView method in the adapter:
if (convertView == null) {
convertView = lInflater.inflate(R.layout.item_gallery, null);
((RelativeLayout) convertView.findViewById(R.id.image_issue_layout)).setLayoutParams(new CoverFlowView.LayoutParams(
app.getResources().getDimensionPixelSize(R.dimen.width_coverflow),
app.getResources().getDimensionPixelSize(R.dimen.height_coverflow)));
and in res folder specify different values width_coverflow for the different screens: values-sw600dp-land, values-sw720dp and so on...

Android Gallery zoom in/out

Hi I am using the Gallery widget to show images downloaded from the internet.
to show several images and I would like to have a gradual zoom while people slide up and down on the screen. I know how to implement the touch event the only thing I don't know how to make the whole gallery view grow gradually. I don't want to zoom in on one image I want the whole gallery to zoom in/out gradually.
EDIT3: I manage to zoom the visible part of the gallery but the problem is I need to find a way for the gallery to find out about it and update it's other children too.
What happens is if 3 images are visible then you start zooming and the gallery does get smaller, so do the images but what I would like in this case is more images to be visible but I don't know how to reach this desired effect. Here's the entire code:
public class Gallery1 extends Activity implements OnTouchListener {
private static final String TAG = "GalleryTest";
private float zoom=0.0f;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
Gallery g;
LinearLayout layout2;
private ImageAdapter ad;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery_1);
layout2=(LinearLayout) findViewById(R.id.layout2);
// Reference the Gallery view
g = (Gallery) findViewById(R.id.gallery);
// Set the adapter to our custom adapter (below)
ad=new ImageAdapter(this);
g.setAdapter(ad);
layout2.setOnTouchListener(this);
}
public void zoomList(boolean increase) {
Log.i(TAG, "startig animation");
AnimatorSet set = new AnimatorSet();
set.playTogether(
ObjectAnimator.ofFloat(g, "scaleX", zoom),
ObjectAnimator.ofFloat(g, "scaleY", zoom)
);
set.addListener(new AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
}
#Override
public void onAnimationRepeat(Animator animation) {
// TODO Auto-generated method stub
}
#Override
public void onAnimationEnd(Animator animation) {
}
#Override
public void onAnimationCancel(Animator animation) {
// TODO Auto-generated method stub
}
});
set.setDuration(100).start();
}
public class ImageAdapter extends BaseAdapter {
private static final int ITEM_WIDTH = 136;
private static final int ITEM_HEIGHT = 88;
private final int mGalleryItemBackground;
private final Context mContext;
private final Integer[] mImageIds = {
R.drawable.gallery_photo_1,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_3,
R.drawable.gallery_photo_4,
R.drawable.gallery_photo_5,
R.drawable.gallery_photo_6,
R.drawable.gallery_photo_7,
R.drawable.gallery_photo_8
};
private final float mDensity;
public ImageAdapter(Context c) {
mContext = c;
// See res/values/attrs.xml for the <declare-styleable> that defines
// Gallery1.
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 1);
a.recycle();
mDensity = c.getResources().getDisplayMetrics().density;
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
convertView = new ImageView(mContext);
imageView = (ImageView) convertView;
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(
(int) (ITEM_WIDTH * mDensity + 0.5f),
(int) (ITEM_HEIGHT * mDensity + 0.5f)));
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mImageIds[position]);
return imageView;
}
}
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE
&& event.getPointerCount() > 1) {
midPoint(mid, event);
if(mid.y > start.y){
Log.i(TAG, "Going down (Math.abs(mid.y - start.y)= "+(Math.abs(mid.y - start.y))+" and zoom="+zoom); // going down so increase
if ((Math.abs(mid.y - start.y) > 10) && (zoom<2.5f)){
zoom=zoom+0.1f;
midPoint(start, event);
zoomList(true);
}
return true;
}else if(mid.y < start.y){
Log.i(TAG, "Going up (Math.abs(mid.y - start.y)= "+(Math.abs(mid.y - start.y))+" and zoom="+zoom); //smaller
if ((Math.abs(mid.y - start.y) > 10) &&(zoom>0.1)){
midPoint(start, event);
zoom=zoom-0.1f;
zoomList(false);
}
return true;
}
}
else if (event.getAction() == MotionEvent.ACTION_POINTER_DOWN) {
Log.e(TAG, "Pointer went down: " + event.getPointerCount());
return true;
}
else if (event.getAction() == MotionEvent.ACTION_UP) {
Log.i(TAG, "Pointer going up");
return true;
}
else if (event.getAction() == MotionEvent.ACTION_DOWN) {
Log.i(TAG, "Pointer going down");
start.set(event.getX(), event.getY());
return true;
}
return false;
// indicate event was handled or not
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
I realise I will probably have to extend the Gallery or even another View group or create my own class but I don't know where to start: which method use the one responsible for scaling...
EDIT4: I don't know if he question is clear enough. Here is an example of states:
State one: initial state, we have 3 images in view
State 2: we detect vertical touches going up with 2 fingers = we have to zoom out
state 3: we start zooming = animation on the gallery or on the children???
state 4: gallery detects that it's 3 children are smaller
state 5: gallery adds 1 /more children according to the new available space
LAST UPDATE:
Thanks to all that have posted but I have finally reached a conclusion and that is to not use Gallery at all:
1. It's deprecated
2. It's not customizable enough for my case
If you want to animate several images at once you may want to consider using OpenGl, I am using libgdx library:
https://github.com/libgdx/libgdx

The following ScalingGallery implementation might be of help.
This gallery subclass overrides the getChildStaticTransformation(View child, Transformation t) method in which the scaling is performed. You can further customize the scaling parameters to fit your own needs.
Please note the ScalingGalleryItemLayout.java class. This is necessary because after you have performed the scaling operationg on the child views, their hit boxes are no longer valid so they must be updated from with the getChildStaticTransformation(View child, Transformation t) method.
This is done by wrapping each gallery item in a ScalingGalleryItemLayout which extends a LinearLayout. Again, you can customize this to fit your own needs if a LinearLayout does not meet your needs for layout out your gallery items.
File : /src/com/example/ScalingGallery.java
/**
* A Customized Gallery component which alters the size and position of its items based on their position in the Gallery.
*/
public class ScalingGallery extends Gallery {
public static final int ITEM_SPACING = -20;
private static final float SIZE_SCALE_MULTIPLIER = 0.25f;
private static final float ALPHA_SCALE_MULTIPLIER = 0.5f;
private static final float X_OFFSET = 20.0f;
/**
* Implemented by child view to adjust the boundaries after it has been matrix transformed.
*/
public interface SetHitRectInterface {
public void setHitRect(RectF newRect);
}
/**
* #param context
* Context that this Gallery will be used in.
* #param attrs
* Attributes for this Gallery (via either xml or in-code)
*/
public ScalingGallery(Context context, AttributeSet attrs) {
super(context, attrs);
setStaticTransformationsEnabled(true);
setChildrenDrawingOrderEnabled(true);
}
/**
* {#inheritDoc}
*
* #see #setStaticTransformationsEnabled(boolean)
*
* This is where the scaling happens.
*/
protected boolean getChildStaticTransformation(View child, Transformation t) {
child.invalidate();
t.clear();
t.setTransformationType(Transformation.TYPE_BOTH);
// Position of the child in the Gallery (... +2 +1 0 -1 -2 ... 0 being the middle)
final int childPosition = getSelectedItemPosition() - getPositionForView(child);
final int childPositionAbs = (int) Math.abs(childPosition);
final float left = child.getLeft();
final float top = child.getTop();
final float right = child.getRight();
final float bottom = child.getBottom();
Matrix matrix = t.getMatrix();
RectF modifiedHitBox = new RectF();
// Change alpha, scale and translate non-middle child views.
if (childPosition != 0) {
final int height = child.getMeasuredHeight();
final int width = child.getMeasuredWidth();
// Scale the size.
float scaledSize = 1.0f - (childPositionAbs * SIZE_SCALE_MULTIPLIER);
if (scaledSize < 0) {
scaledSize = 0;
}
matrix.setScale(scaledSize, scaledSize);
float moveX = 0;
float moveY = 0;
// Moving from right to left -- linear move since the scaling is done with respect to top-left corner of the view.
if (childPosition < 0) {
moveX = ((childPositionAbs - 1) * SIZE_SCALE_MULTIPLIER * width) + X_OFFSET;
moveX *= -1;
} else { // Moving from left to right -- sum of the previous positions' x displacements.
// X(n) = X(0) + X(1) + X(2) + ... + X(n-1)
for (int i = childPositionAbs; i > 0; i--) {
moveX += (i * SIZE_SCALE_MULTIPLIER * width);
}
moveX += X_OFFSET;
}
// Moving down y-axis is linear.
moveY = ((childPositionAbs * SIZE_SCALE_MULTIPLIER * height) / 2);
matrix.postTranslate(moveX, moveY);
// Scale alpha value.
final float alpha = (1.0f / childPositionAbs) * ALPHA_SCALE_MULTIPLIER;
t.setAlpha(alpha);
// Calculate new hit box. Since we moved the child, the hitbox is no longer lined up with the new child position.
final float newLeft = left + moveX;
final float newTop = top + moveY;
final float newRight = newLeft + (width * scaledSize);
final float newBottom = newTop + (height * scaledSize);
modifiedHitBox = new RectF(newLeft, newTop, newRight, newBottom);
} else {
modifiedHitBox = new RectF(left, top, right, bottom);
}
// update child hit box so you can tap within the child's boundary
((SetHitRectInterface) child).setHitRect(modifiedHitBox);
return true;
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// Helps to smooth out jittering during scrolling.
// read more - http://www.unwesen.de/2011/04/17/android-jittery-scrolling-gallery/
final int viewsOnScreen = getLastVisiblePosition() - getFirstVisiblePosition();
if (viewsOnScreen <= 0) {
super.onLayout(changed, l, t, r, b);
}
}
private int mLastDrawnPosition;
#Override
protected int getChildDrawingOrder(int childCount, int i) {
//Reset the last position variable every time we are starting a new drawing loop
if (i == 0) {
mLastDrawnPosition = 0;
}
final int centerPosition = getSelectedItemPosition() - getFirstVisiblePosition();
if (i == childCount - 1) {
return centerPosition;
} else if (i >= centerPosition) {
mLastDrawnPosition++;
return childCount - mLastDrawnPosition;
} else {
return i;
}
}
}
File : /src/com/example/ScalingGalleryItemLayout.java
public class ScalingGalleryItemLayout extends LinearLayout implements SetHitRectInterface {
public ScalingGalleryItemLayout(Context context) {
super(context);
}
public ScalingGalleryItemLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ScalingGalleryItemLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private Rect mTransformedRect;
#Override
public void setHitRect(RectF newRect) {
if (newRect == null) {
return;
}
if (mTransformedRect == null) {
mTransformedRect = new Rect();
}
newRect.round(mTransformedRect);
}
#Override
public void getHitRect(Rect outRect) {
if (mTransformedRect == null) {
super.getHitRect(outRect);
} else {
outRect.set(mTransformedRect);
}
}
}
File : /res/layout/ScaledGalleryItemLayout.xml
<?xml version="1.0" encoding="utf-8"?>
<com.example.ScalingGalleryItemLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gallery_item_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical"
android:padding="5dp" >
<ImageView
android:id="#+id/gallery_item_image"
android:layout_width="360px"
android:layout_height="210px"
android:layout_gravity="center"
android:antialias="true"
android:background="#drawable/gallery_item_button_selector"
android:cropToPadding="true"
android:padding="35dp"
android:scaleType="centerInside" />
<TextView
android:id="#+id/gallery_item_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#drawable/white"
android:textSize="30sp" />
</com.example.ScalingGalleryItemLayout>

To keep the state of the animation after it is done, just do this on your animation:
youranim.setFillAfter(true);
Edit :
In my project, I use this method and i think, it's help you :
http://developer.sonymobile.com/wp/2011/04/12/how-to-take-advantage-of-the-pinch-to-zoom-feature-in-your-xperia%E2%84%A2-10-apps-part-1/

U can do Image Zoom pinch option for gallery also.
by using below code lines:
you can download the example.
https://github.com/alvinsj/android-image-gallery/downloads
I hope this example will help to u..if u have any queries ask me.....

This is solution
integrate gallery component in android with gesture-image library
gesture-imageView
And here is full sample code
SampleCode