Hi!

Do you know the Transition3d + Rotate3dAnimation from the APIDemos?

I wondered how one could use this animation effect for finishing and starting Activities. Well, this is my solution to it.

*UPDATE 05.12.2011* Working example: ActivitySwitcher

  1. Create a package com.yourapp.animation and copy the Rotate3dAnimation.java in it.
  2. Next, create a new Class yourapp.animation.ActivitySwitcher and implement it like this:

    com.yourapp.animation.ActivitySwitcher.java

    package com.yourapp.animation;
 
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
 
public class ActivitySwitcher {
 
	private final static int DURATION = 300;
	private final static float DEPTH = 400.0f;
 
	/* ----------------------------------------------- */
 
	public interface AnimationFinishedListener {
		/**
		 * Called when the animation is finished.
		 */
		public void onAnimationFinished();
	}
 
	/* ----------------------------------------------- */
 
	public static void animationIn(View container, WindowManager windowManager) {
		animationIn(container, windowManager, null);
	}
 
	public static void animationIn(View container, WindowManager windowManager, AnimationFinishedListener listener) {
		apply3DRotation(90, 0, false, container, windowManager, listener);
	}
 
	public static void animationOut(View container, WindowManager windowManager) {
		animationOut(container, windowManager, null);
	}
 
	public static void animationOut(View container, WindowManager windowManager, AnimationFinishedListener listener) {
		apply3DRotation(0, -90, true, container, windowManager, listener);
	}
 
	/* ----------------------------------------------- */
 
	private static void apply3DRotation(float fromDegree, float toDegree, boolean reverse, View container, WindowManager windowManager, final AnimationFinishedListener listener) {
		Display display = windowManager.getDefaultDisplay();
		final float centerX = display.getWidth() / 2.0f;
		final float centerY = display.getHeight() / 2.0f;
 
		final Rotate3dAnimation a = new Rotate3dAnimation(fromDegree, toDegree, centerX, centerY, DEPTH, reverse);
		a.reset();
		a.setDuration(DURATION);
		a.setFillAfter(true);
		a.setInterpolator(new AccelerateInterpolator());
		if (listener != null) {
			a.setAnimationListener(new Animation.AnimationListener() {
				@Override
				public void onAnimationStart(Animation animation) {
				}
 
				@Override
				public void onAnimationRepeat(Animation animation) {
				}
 
				@Override
				public void onAnimationEnd(Animation animation) {
					listener.onAnimationFinished();
				}
			});
		}
		container.clearAnimation();
		container.startAnimation(a);
	}
}


  3. That’s it! Now you can use it like this:

    Activity1.java

    package com.yourapp.activity
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.yourapp.R;
import com.yourapp.animation.ActivitySwitcher;
 
public class Activity1 extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity1);
 
		Button switchActivityBtn = (Button) findViewById(R.id.bSwitchActivity);
		switchActivityBtn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				animatedStartActivity();
			}
		});
	}
 
	@Override
	protected void onResume() {
		// animateIn this activity
		ActivitySwitcher.animationIn(findViewById(R.id.container), getWindowManager());
		super.onResume();
	}
 
	private void animatedStartActivity() {
		// we only animateOut this activity here.
		// The new activity will animateIn from its onResume() - be sure to implement it.
		final Intent intent = new Intent(getApplicationContext(), Activity2.class);
		// disable default animation for new intent
		intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
		ActivitySwitcher.animationOut(findViewById(R.id.container), getWindowManager(), new ActivitySwitcher.AnimationFinishedListener() {
			@Override
			public void onAnimationFinished() {
				startActivity(intent);
			}
		});
	}
}


    Implement Activity2.java like Activity1.java.

    The layouts (R.layout.activity1 and R.layout.activity1) must jave acontainer-id like this:

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/container"
	android:orientation="vertical"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<!-- ... -->
</LinearLayout>


  4. If you want to animate an activity out when it is finished, you could override thefinish() method:
    // ...
	@Override
	public void finish() {
		// we need to override this to performe the animtationOut on each
		// finish.
		ActivitySwitcher.animationOut(findViewById(R.id.container), getWindowManager(), new ActivitySwitcher.AnimationFinishedListener() {
			@Override
			public void onAnimationFinished() {
				Activity1.super.finish();
				// disable default animation
				overridePendingTransition(0, 0);
			}
		});
	}
// ...


That’s it!