Android ImageView Animation

user_88847 0
Viewed 166411

I've created a layout with an image view and a web view. The web view is set to have a default visibility of gone. When the activity fires up it displays the image view first and when the web view has finished loading its url, it marks itself as visible and the imageview is marked as hidden.

When the imageview is shown, I would like it to rotate repeatedly just for a little added pizazz.

I have never done animations before in Android and all the posts I found when I asked the internet were not helpful; thus, I have returned to SO for help.

So if I start with this...

    final ImageView splash = (ImageView)findViewById(R.id.splash);

How do I create a repeated rotate animation and apply it to the ImageView?

Thanks again!

android-animation android
9 Answers

Use a RotateAnimation, setting the pivot point to the centre of your image.

RotateAnimation anim = new RotateAnimation(0f, 350f, 15f, 15f);
anim.setInterpolator(new LinearInterpolator());
anim.setRepeatCount(Animation.INFINITE);
anim.setDuration(700);

// Start animating the image
final ImageView splash = (ImageView) findViewById(R.id.splash);
splash.startAnimation(anim);

// Later.. stop the animation
splash.setAnimation(null);
user_2349380

You can also simply use the Rotate animation feature. That runs a specific animation, for a pre-determined amount of time, on an ImageView.

Animation rotate = AnimationUtils.loadAnimation([context], R.anim.rotate_picture);
splash.startAnimation(rotate);

Then create an animation XML file in your res/anim called rotate_picture with the content:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shareInterpolator="false">

    <rotate 
    android:fromDegrees="0"
    android:toDegrees="360"
    android:duration="5000"
    android:pivotX="50%"
    android:pivotY="50%">
</rotate>
</set>

Now unfortunately, this will only run it once. You'll need a loop somewhere to make it repeat the animation while it's waiting. I experimented a little bit and got my program stuck in infinite loops, so I'm not sure of the best way to that. EDIT: Christopher's answer provides the info on how to make it loop properly, so removing my bad suggestion about separate threads!

user_2356540

One way - split you image into N rotating it slightly every time. I'd say 5 is enough. then create something like this in drawable

<animation-list   android:id="@+id/handimation" android:oneshot="false" 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/progress1" android:duration="150" />
    <item android:drawable="@drawable/progress2" android:duration="150" />
    <item android:drawable="@drawable/progress3" android:duration="150" />
 </animation-list>

code start

progress.setVisibility(View.VISIBLE);
AnimationDrawable frameAnimation = (AnimationDrawable)progress.getDrawable();
frameAnimation.setCallback(progress);
frameAnimation.setVisible(true, true);

code stop 

AnimationDrawable frameAnimation = (AnimationDrawable)progress.getDrawable();
frameAnimation.stop();
frameAnimation.setCallback(null);
frameAnimation = null;
progress.setVisibility(View.GONE);

more here

user_1767610

I have found out, that if you use the .getWidth/2 etc... that it won't work you need to get the number of pixels the image is and divide it by 2 yourself and then just type in the number for the last 2 arguments.

so say your image was a 120 pixel by 120 pixel square, ur x and y would equal 60 pixels. so in your code, you would right:

RotateAnimation anim = new RotateAnimation(0f, 350f, 60f, 60f);
anim.setInterpolator(new LinearInterpolator());
anim.setRepeatCount(Animation.INFINITE);
anim.setDuration(700);

and now your image will pivot round its center.

user_11497170
Related