Develop Reference

How to resume and pause ObjectAnimator in Android for API Levels below 19?

I am aware that API level 19 supports pause() and resume() on ObjectAnimators. But in my project at API level 14, I have an ObjectAnimator which is applied to an Image view to rotate it. I want to pause the animation provided by the ObjectAnimator on touch and resume it from the place where the image view was (before touch down).
So I attempted to save the current play time and cancel the object animator on my stopAnimation() function.
private void stopAnimation(){
currentTime = mGlobeAnimator.getCurrentPlayTime();
mGlobeAnimator.cancel();
}
In the startAnimation() function, I recreate the animator, set its target to the image view, set the saved play time and start it.
private void startAnimation(Context context, View view, float startAngle) {
ObjectAnimator globeAnimatorClone = (ObjectAnimator)AnimatorInflater.loadAnimator(context, R.animator.rotate_globe);
globeAnimatorClone.setTarget(mImageView);
globeAnimatorClone.setCurrentPlayTime(currentTime);
globeAnimatorClone.start();
}
This does not work. Would anybody help please with any pointers to pause and resume animation provided by animator for API level before 19?

I think I got it working by starting the animator and then setting the currentPlayTime(). The documentation clearly tells (which I just stumbled upon) that if the animation has not been started, the currentPlayTime set using this method will not advance the forward!
Sets the position of the animation to the specified point in time. This time should be between 0 and the total duration of the animation, including any repetition. If the animation has not yet been started, then it will not advance forward after it is set to this time; it will simply set the time to this value and perform any appropriate actions based on that time. If the animation is already running, then setCurrentPlayTime() will set the current playing time to this value and continue playing from that point. http://developer.android.com/reference/android/animation/ValueAnimator.html#setCurrentPlayTime(long)
private void stopAnimation(){
mCurrentPlayTime = mRotateAntiClockwiseAnimator.getCurrentPlayTime();
mRotateAntiClockwiseAnimator.cancel();
}
private void startAnimation() {
mRotateAntiClockwiseAnimator.start();
mRotateAntiClockwiseAnimator.setCurrentPlayTime(mCurrentPlayTime);
}

What you are doing is that it will just restart your animation, instead you can create a custom class for animation with pause and resume method.
You need to first check if the device is 19 api and above if it is then use the native pauses and resume of the object animator else use the regular Animation designed from api 1, you can follow this thread for pause and resume below api 19.

Its probably too late for me to answer, i just came across this problem and i solved it using your method.
i just added two things to your approach
1. In the start of animation check if the ** mCurrentPlayTime** is greater than zero.if its >0 then setCurrentPlayTime. otherwise its useless.
2. when your animation ends make it zero again.

Unity2D Android Touch misbehaving

I am attempting to translate an object depending on the touch position of the user.
The problem with it is, when I test it out, the object disappears as soon as I drag my finger on my phone screen. I am not entirely sure what's going on with it?
If somebody can guide me that would be great :)
Thanks
This is the Code:
#pragma strict
function Update () {
for (var touch : Touch in Input.touches)
{
if (touch.phase == TouchPhase.Moved) {
transform.Translate(0, touch.position.y, 0);
}
}
}

The problem is that you're moving the object by touch.position.y. This isn't a point inworld, it's a point on the touch screen. What you'll want to do is probably Camera.main.ScreenToWorldPoint(touch.position).y which will give you the position inworld for wherever you've touched.
Of course, Translate takes a vector indicating distance, not final destination, so simply sticking the above in it still won't work as you're intending.
Instead maybe try this:
Vector3 EndPos = Camera.main.ScreenToWorldPoint(touch.position);
float speed = 1f;
transform.position = Vector3.Lerp(transform.position, EndPos, speed * Time.deltaTime);
which should move the object towards your finger while at the same time keeping its movements smooth looking.

You'll want to ask this question at Unity's dedicated Questions/Answers site: http://answers.unity3d.com/index.html
There are very few people that come to stackoverflow for Unity specific question, unless they relate to Android/iOS specific features.
As for the cause of your problem, touch.position.y is define in screen space (pixels) where as transform.Translate is expecting world units (meters). You can convert between the two using the Camera.ScreenToWorldPoint() method, then creating a vector out of the camera position and screen world point. With this vector you can then either intersect some geometry in the scene or simply use it as a point in front of the camera.
http://docs.unity3d.com/Documentation/ScriptReference/Camera.ScreenToWorldPoint.html

Google Maps Android, detect user interation in a location aware map

I've an Android Application that displays a map.
The map is by default centered on the user position following its movements (the center is updated according to the position updates).
However I want the user to be able to use gestures to navigate throw the map. When the user starts the navigation I want the "following" to stop, and a button is displayed so that it can start again.
How can I know when the user has moved the map center?
On the GoogleMap.OnCameraChangeListener, I don't know if the change is due to a location changed or a user interaction.
I've a a kind of working solution using the OnCameraChangeListener, but its a bit "dirty" and I don't find it very nice:
map.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
#Override
public void onCameraChange(CameraPosition position) {
// gpsPosition contains the last position obtained
if(isFollowing && gpsPosition!=null && (Math.abs(position.target.latitude - gpsPosition.latitude)>0.000001 || Math.abs(position.target.longitude - gpsPosition.longitude)>0.000001) ){
isFollowing = false;
map.getUiSettings().setMyLocationButtonEnabled(true);
}
}
});
Is there a nice Solution to the problem?

If you want to detect user interacting with the map OnCameraChangeListener is surely too late to do that. It may be called seconds after user started interacting with the map.
What you need to do, is add 2 other listeners:
OnMyLocationButtonClickListener - to know when to start tracking (set your isFollowing to true)
OnMyLocationChangeListener - when your isFollowing is true, call GoogleMap.animateCamera to the new position
So the only thing left is when you set isFollowing to false:
Create an invisible overlay in your layout (like here, but with normal View instead of custom) and assign this overlay (the View) an OnTouchListener (ok, it is 3rd, I lied that you need only 2).
In this listener always return false, but also set isFollowing to false. This when when user starts interacting with the map and you should stop automated camera movements.
I also see you are showing and hiding my location button, so do this where you change the value of isFollowing. Btw.: good idea to do that. I'll try it too.

I have never tried this, but here are some ideas off the top of my (balding) head:
Option #1: Handle the location change updates yourself, by recentering the map yourself when the location change comes in. If a camera-change event occurs that does not appear to be tied to the location change (e.g., 5+ milliseconds later), that was presumably a user modifying the map via gestures.
Option #2: Subclass the Maps V2 MapView and override touch-related methods like onTouchEvent(). In addition to chaining to the superclass, you would know that a camera change that happens very soon from now probably is from the user modifying the map via gestures.
Option #3: Do both of the above. That way, all changes to the map should touch your code, which should increase the reliability of your determining the source of the camera change.
BTW, I filed a feature request for a better solution.

The simpliest way should be saving the center Longitude and Latitude of your Map.
Now create an EventListener and check it in an if-statement:
if(oldLongLat != newLongLat){
//Something has moved
}else {
//Nothing has moved
}

Adding markers at intervals to videoview player in android

Is it possible to add markers to video's at regular intervals on the video view progress bar so that the video can stop at that point and start another activity? For instance at 10 min into a video I need a marker in the videoview progress bar, and when the video comes to 10 min, the video stops and the other activity starts ?

Yes, It possible, (Rough Idea..)
The exact method I don't know, but you can make a Hack.. By using methods
public int getDuration() and getCurrentPosition() of
MedaiPlayer class.
Basic Idea, What to do is make a ProgressBar (for complete video duration) and now when you add marker to it just get the duration of that marker (using some mathematical formula). And now check for current Position of your Video file, If its your marker position then using condition stop your video ans start a new Activity..
(If I'm going wrong let me know)

Replicating Maps Follow Current Location Feature in Android

I am looking to figure out how I can replicate the follow current location feature that exists in Maps on Android (and iPhone) using the Google Maps external library. The way the feature works in Maps is that when you press the button it begins panning with your location until you touch (and/or move) the map. Using the following I have been able to get my app to keep the current location on the screen but not keep the current location in the center of the screen (it pans when the location gets near the edge of the screen whereas Maps keeps it in the center the whole time):
butMapCurrentLocation.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
runOnUiThread(new Runnable() {
public void run() {
mapController.animateTo(myLocationOverlay.getMyLocation());
}
});
}
});
I also tried setCenter rather than animateTo and they seem to have the same effect.
Additionally it is worth noting I need to be able to stop this function that keeps the location in the center (such as when another button is pressed or the map is touched). The Runnable above doesn't stop right away and I cannot get it to stop properly when requested even when using .cancel as discussed here: Android: How do I stop Runnable?

There is no official way yet to do that in Google Maps v2.
You can do what you want however. There is two things you have to do:
Register for location updates from some LocationProviders (eg gps) to get the user's location. When you get the location animate map to the new location.
Stop this when the user moved the map.
So doing 1. is easy, doing 2. is not possible officially with the Maps v2 api. Look at this issue for more details.
The workaround suggested there is to create your own MapView (extend the original MapView) and override it's dispatchTouchEvent method. There you can catch any touch events and can detect if the user touched/moved the map.