BlurKeyFrameTransitionAnimation.java

package at.favre.lib.dali.builder.animation;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Created by PatrickF on 29.05.2014.
 */
public class BlurKeyFrameTransitionAnimation {
	private final static String TAG = BlurKeyFrameTransitionAnimation.class.getSimpleName();

	private List<TransitionDrawable> transitionDrawables = new ArrayList<TransitionDrawable>();
	private Context ctx;
	private Handler handler = new Handler(Looper.getMainLooper());
	private BlurKeyFrameManager manager;

	private List<Runnable> runnables;

	private boolean running = false;
	private boolean canceled = false;
	private KeyFrameAnimationListener listener;


	public BlurKeyFrameTransitionAnimation(Context ctx, BlurKeyFrameManager manager) {
		this.ctx = ctx;
		this.manager = manager;
		this.runnables= new CopyOnWriteArrayList<Runnable>();
	}

	public void prepareAnimation(Bitmap original) {
		BlurKeyFrameManager.KeyFrameData data = manager.prepareFrames(ctx,original);
		transitionDrawables = new ArrayList<TransitionDrawable>();

		for (int i = 0; i < data.getFrames().size(); i++) {
			if(i+1 < data.getFrames().size()) {
				TransitionDrawable t = new TransitionDrawable(new Drawable[]{new BitmapDrawable(ctx.getResources(),data.getFrames().get(i)),new BitmapDrawable(ctx.getResources(),data.getFrames().get(i+1))});
				transitionDrawables.add(t);
			}
		}
	}

	public void start(final ImageView imageView) {
		if(listener != null) {
			listener.onAnimationStart();
		}
		long duration = 0;
		for (int i = 0; i < transitionDrawables.size(); i++) {
			final int iterator = i;

			handler.postDelayed(new Runnable() {
				@Override
				public void run() {
					TransitionDrawable t = transitionDrawables.get(iterator);
					t.startTransition(manager.getKeyFrames().get(iterator).getDuration());
					imageView.setImageDrawable(t);
					Log.d(TAG,"transition "+iterator );
				}
			},duration);
			duration += manager.getKeyFrames().get(i).getDuration();
		}

		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				Log.d(TAG,"reset animation");
				for (TransitionDrawable transitionDrawable : transitionDrawables) {
					transitionDrawable.resetTransition();
				}

				if(listener != null) {
					listener.onAnimationEnd();
				}
			}
		},duration);
	}

	public synchronized void cancel() {
		this.canceled = true;
		this.running = false;
	}

	public static interface KeyFrameAnimationListener {
		public void onAnimationStart();
		public void onKeyFrameChange(int keyFrameNo);
		public void onAnimationEnd();
	}

}