Gif

package tobiass.statedebt.view;

import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidParameterException;

import tobiass.statedebt.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.util.AttributeSet;
import android.view.View;

public class GifView extends View {
	Movie movie;
	long moviestart;

	public GifView(Context context) {
		super(context);
	}
	
	public GifView(Context context, AttributeSet set) throws IOException {
		super(context, set);
		
		TypedArray a = context.getTheme().obtainStyledAttributes(set, R.styleable.GifView, 0, 0);
		int res = a.getResourceId(R.styleable.GifView_drawable, -1);
		String asset = a.getString(R.styleable.GifView_asset);
		a.recycle();
		if(asset != null) {
			loadGIFAsset(asset);
		}
		else if(res > -1) {
			loadGIFResource(res);
		}
		else {
			throw new InvalidParameterException();
		}
	}
	
	public void loadGIFResource(int id) {
		InputStream is = getContext().getResources().openRawResource(id);
		movie = Movie.decodeStream(is);
		invalidate();
	}

	public void loadGIFAsset(String filename) throws IOException {
		InputStream is;
		try {
			is = getContext().getResources().getAssets().open(filename);
			movie = Movie.decodeStream(is);
			invalidate();
		} catch (IOException e) {
			throw e;
		}
	}

	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		if(movie != null) {
			long now = android.os.SystemClock.uptimeMillis();
			if (moviestart == 0)
				moviestart = now;
			movie.setTime((int) ((now - moviestart) % movie.duration()));
			movie.draw(canvas, 0, 0);
			invalidate();
		}
	}
}