How to create a rotate 3D Animation between a ListView and an ImageView in Android?

By | April 21, 2013

At first we will create a class called “Rotate3dAnimation” which is responsible for the 3D Animation.

The Rotate3dAnimation.java looks like this.

package com.example.transition3d;

import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.graphics.Camera;
import android.graphics.Matrix;

/**
 * An animation that rotates the view on the Y axis between two specified angles.
 * This animation also adds a translation on the Z axis (depth) to improve the effect.
 */
public class Rotate3dAnimation extends Animation {
    private final float mFromDegrees;
    private final float mToDegrees;
    private final float mCenterX;
    private final float mCenterY;
    private final float mDepthZ;
    private final boolean mReverse;
    private Camera mCamera;

    /**
     * Creates a new 3D rotation on the Y axis. The rotation is defined by its
     * start angle and its end angle. Both angles are in degrees. The rotation
     * is performed around a center point on the 2D space, definied by a pair
     * of X and Y coordinates, called centerX and centerY. When the animation
     * starts, a translation on the Z axis (depth) is performed. The length
     * of the translation can be specified, as well as whether the translation
     * should be reversed in time.
     *
     * @param fromDegrees the start angle of the 3D rotation
     * @param toDegrees the end angle of the 3D rotation
     * @param centerX the X center of the 3D rotation
     * @param centerY the Y center of the 3D rotation
     * @param reverse true if the translation should be reversed, false otherwise
     */
    public Rotate3dAnimation(float fromDegrees, float toDegrees,
            float centerX, float centerY, float depthZ, boolean reverse) {
        mFromDegrees = fromDegrees;
        mToDegrees = toDegrees;
        mCenterX = centerX;
        mCenterY = centerY;
        mDepthZ = depthZ;
        mReverse = reverse;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        mCamera = new Camera();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final float fromDegrees = mFromDegrees;
        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);

        final float centerX = mCenterX;
        final float centerY = mCenterY;
        final Camera camera = mCamera;

        final Matrix matrix = t.getMatrix();

        camera.save();
        if (mReverse) {
            camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
        }
        camera.rotateY(degrees);
        camera.getMatrix(matrix);
        camera.restore();

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

The Matrix class holds a 3×3 matrix for transforming coordinates. Matrix does not have a constructor, so it must be explicitly initialized using either reset() – to construct an identity matrix, or one of the set..() functions (e.g. setTranslate, setRotate, etc.).

Read more about Matrix Classes here.

Now the MainActivity that contains a ListView and an Image.
What we are going to do here is When we click the ListView the ListView will rotate with a 3D Animation and show the Image on the other side.

MainActivity.java

package com.example.transition3d;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;

public class MainActivity extends Activity implements
		AdapterView.OnItemClickListener, View.OnClickListener {
	private ListView mPhotosList;
	private ViewGroup mContainer;
	private ImageView mImageView;

	// Names of the photos we show in the list
	private static final String[] PHOTOS_NAMES = new String[] { "Lyon",
			"Livermore", "Tahoe Pier", "Lake Tahoe", "Grand Canyon", "Bodie" };

	// Resource identifiers for the photos we want to display
	private static final int[] PHOTOS_RESOURCES = new int[] {
			R.drawable.photo1, R.drawable.photo2, R.drawable.photo3,
			R.drawable.photo4, R.drawable.photo5, R.drawable.photo6 };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.animations_main_screen);

		mPhotosList = (ListView) findViewById(android.R.id.list);
		mImageView = (ImageView) findViewById(R.id.picture);
		mContainer = (ViewGroup) findViewById(R.id.container);

		// Prepare the ListView
		final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, PHOTOS_NAMES);

		mPhotosList.setAdapter(adapter);
		mPhotosList.setOnItemClickListener(this);

		// Prepare the ImageView
		mImageView.setClickable(true);
		mImageView.setFocusable(true);
		mImageView.setOnClickListener(this);

		// Since we are caching large views, we want to keep their cache
		// between each animation
		mContainer
				.setPersistentDrawingCache(ViewGroup.PERSISTENT_ANIMATION_CACHE);
	}

	/**
	 * Setup a new 3D rotation on the container view.
	 * 
	 * @param position
	 *            the item that was clicked to show a picture, or -1 to show the
	 *            list
	 * @param start
	 *            the start angle at which the rotation must begin
	 * @param end
	 *            the end angle of the rotation
	 */
	private void applyRotation(int position, float start, float end) {
		// Find the center of the container
		final float centerX = mContainer.getWidth() / 2.0f;
		final float centerY = mContainer.getHeight() / 2.0f;

		// Create a new 3D rotation with the supplied parameter
		// The animation listener is used to trigger the next animation
		final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end,
				centerX, centerY, 310.0f, true);
		rotation.setDuration(500);
		rotation.setFillAfter(true);
		rotation.setInterpolator(new AccelerateInterpolator());
		rotation.setAnimationListener(new DisplayNextView(position));

		mContainer.startAnimation(rotation);
	}

	public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
		// Pre-load the image then start the animation
		mImageView.setImageResource(PHOTOS_RESOURCES[position]);
		applyRotation(position, 0, 90);
	}

	public void onClick(View v) {
		applyRotation(-1, 180, 90);
	}

	/**
	 * This class listens for the end of the first half of the animation. It
	 * then posts a new action that effectively swaps the views when the
	 * container is rotated 90 degrees and thus invisible.
	 */
	private final class DisplayNextView implements Animation.AnimationListener {
		private final int mPosition;

		private DisplayNextView(int position) {
			mPosition = position;
		}

		public void onAnimationStart(Animation animation) {
		}

		public void onAnimationEnd(Animation animation) {
			mContainer.post(new SwapViews(mPosition));
		}

		public void onAnimationRepeat(Animation animation) {
		}
	}

	/**
	 * This class is responsible for swapping the views and start the second
	 * half of the animation.
	 */
	private final class SwapViews implements Runnable {
		private final int mPosition;

		public SwapViews(int position) {
			mPosition = position;
		}

		public void run() {
			final float centerX = mContainer.getWidth() / 2.0f;
			final float centerY = mContainer.getHeight() / 2.0f;
			Rotate3dAnimation rotation;

			if (mPosition > -1) {
				mPhotosList.setVisibility(View.GONE);
				mImageView.setVisibility(View.VISIBLE);
				mImageView.requestFocus();

				rotation = new Rotate3dAnimation(90, 180, centerX, centerY,
						310.0f, false);
			} else {
				mImageView.setVisibility(View.GONE);
				mPhotosList.setVisibility(View.VISIBLE);
				mPhotosList.requestFocus();

				rotation = new Rotate3dAnimation(90, 0, centerX, centerY,
						310.0f, false);
			}

			rotation.setDuration(500);
			rotation.setFillAfter(true);
			rotation.setInterpolator(new DecelerateInterpolator());

			mContainer.startAnimation(rotation);
		}
	}

}

Now the layout for the MainActivity.java

animations_main_screen.xml

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

    <ListView
        android:id="@android:id/list"
        android:persistentDrawingCache="animation|scrolling"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layoutAnimation="@anim/layout_bottom_to_top_slide" />

    <ImageView
        android:id="@+id/picture"
        android:scaleType="fitCenter"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

</FrameLayout>

Now we have some XML files for the animation of the ListView when it loads.
Here we are applying a bottom to top slide animation in the ListView when it loads.
So for that you have to first create a folder named “anim” in the “res” folder and create an XML named “layout_bottom_to_top_slide.xml” inside it.

layout_bottom_to_top_slide.xml

<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
        android:delay="50%"
        android:animationOrder="reverse"
        android:animation="@anim/slide_right" />

Now you will get an error at this line.

android:animation="@anim/slide_right" 

So for that we create another animation. Create another XML inside the same “anim” folder, but now it is named “slide_right.xml”

slide_right.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
    <translate android:fromXDelta="-100%p" android:toXDelta="0"
            android:duration="@android:integer/config_shortAnimTime" />
</set>

This is the translate animation that slides each row in the ListView.

Make sure you have six sample images with the named “photo1.jpg or png” , photo2.jpg etc…

Download the complete Android sample source code from here.

Join the Forum discussion on this post

Leave a Reply

Your email address will not be published. Required fields are marked *