Develop Reference

How does pivotX/Y work in a rotate animation set

I am trying to understand how rotate animation works.
With the following I rotate a view as follows:
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="8000"
>
<rotate android:fromDegrees="0"
android:toDegrees="30"
android:pivotX="100%"
android:pivotY="100%"
/>
<rotate
android:toDegrees="100"
android:pivotX="100%"
android:pivotY="30%"
/>
</set>
Result:
Now where the arrow is I am trying to rotate again using that as a center.
So I modified my animation set as follows:
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="8000">
<rotate android:fromDegrees="0"
android:toDegrees="30"
android:pivotX="100%"
android:pivotY="100%"
/>
<rotate
android:toDegrees="100"
android:pivotX="100%"
android:pivotY="30%"
/>
<rotate android:pivotY="-30%"
android:pivotX="40%"
android:toDegrees="100"/>
</set>
I.e. I added
<rotate android:pivotY="-30%"
android:pivotX="40%"
android:toDegrees="100"/>
This seems correct to me because looking at the screen the rotate point is around 30% less than the left most value of y and x is about 40% more than the left most value of x.
But when the animation runs it is not working as expected. To be honest I have no clue what is the actual rotation point and the whole view skews to the left.
Result:
What am I misunderstanding here?

Pivot is the point around which it rotates (like putting a pin in a photo). If your 'from' and 'to' pivots aren't the same then you are not just rotating around a set point, you're rotating a bit, then changing the pins location and rotating a bit more for each step (causing a skew).
Just in case you don't know: Android coordinates start at top left not bottom left.
I think all you want in that set is
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="8000">
<rotate android:fromDegrees="0"
android:toDegrees="130"
android:pivotX="100%"
android:pivotY="30%" />
<!-- I believe this, below will the the correct slide you need -->
<translate android:fromXDelta="0"
android:toXDelta="-100%" />
</set>
Which will rotate it 130 degrees around the pin at [100%, 30%] (x being the maximum value , i.e right edge of the screen, and y being 30% of the way down the screen) and at the same time slide it right until it's 100% (of view width) to the right of it's starting position

android rotate animation, make it fluid

I have an ImageView that should rotate for 4 times. This is my xml of animation:
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="500"
android:fromDegrees="0"
android:interpolator="#android:anim/linear_interpolator"
android:pivotX="50%"
android:pivotY="50%"
android:repeatCount="3"
android:repeatMode="restart"
android:toDegrees="360" />
but rotation is not fluid: there's a little delay from end of a rotation, and begin of next one. How can i fix it?

Try to rotate from 0 to 359. 0 and 360 is the same in that context.

why not create an animation the usual way, and if you want it to rotate four times, then create a loop that iterates four times, and for each iteration, it calls the animation. You have to optimize your code so that are no visible drags.

Image moving in background along a curve path android

i am developing app, in which i want am image to move along a curve path in the background screen.i am able to move the image from one point to another using the below translate xml, but its moving along a straight path, i want it to move along a curve path.how can i achieve this?
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="3000"
android:fromXDelta="-20%"
android:fromYDelta="-10%"
android:toXDelta="150%"
android:toYDelta="-130%"
android:zAdjustment="normal" />
please help.thanks!

<rotate
android:toDegrees="360"
android:pivotX="100%"
android:pivotY="200%"
android:duration="6000"
android:repeatMode="restart"
android:repeatCount="infinite"/>
Workaround: I used rotate and played with pivotX and pivotY and image position

How to tilt a button along with its text...?

I am new to android development, can any one tell me how to rotate entire a button into 45 degrees along with text and button rect. I want to rotate permanently and i want on click listener on the same.

You need to use animations for that.
in your /res/anim/ you must create an xml file with this:
<?xml version="1.0" encoding="utf-8"?>
<rotate
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:toDegrees="45"
android:pivotX="50%"
android:pivotY="50%"
android:duration="0"
android:startOffset="0"
/>
and the in your Activity:
RotateAnimation ranim = (RotateAnimation)AnimationUtils.loadAnimation(this, R.anim.YOUR_ANIM);
ranim.setFillAfter(true);
YourButton.setAnimation(ranim);
Apart from that it seems that there are some problems with diagonal rotations (a.k.a. 45 degrees) pre-honeycomb..

Android Linearlayout rotate?

I need to rotate the linearlayout with it's child view's. Now I am using android 2.2 but in Android 3.0 has a rotate option.If we set the rotation degree we can get the rotated view.
setRotation(float rotation)
I need to rotate my view by using android 2.2. How to do this in android 2.2 .Can any one suggest me to do .... !!
Note: I need to rotate the view relevant to it's touch position

Try this:
Create this drawable, say rotation.xml:
<rotate
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:interpolator="#android:anim/linear_interpolator"
android:toDegrees="360"
android:pivotX="50%"
android:pivotY="50%"
android:duration="1000"
android:startOffset="0"
/>
Now set this drawable in the android:src tag of your view.