伊谢尔伦的一角

android显示gif动画

一个支持缩放的gifview 

package com.sa.gifviewdemo;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Movie;
import android.graphics.Rect;
import android.view.View;

public class GifView extends View {
	private Movie mMovie;
	private long movieStart;

	private Rect src, dst;
	private Bitmap tmpBitmap;
	private Canvas tmpCanvas;

	public GifView(Context context) {
		super(context);
	}

	public void setGifResource(int resId) {
		InputStream is = getContext().getResources().openRawResource(resId);
		initializeView(is);
	}
	
	public void setGifFile(File file) throws FileNotFoundException {
	    // 必须使用BufferedInputStream并mark
		int readlimit = 1024 * 64;
		InputStream is = new BufferedInputStream(new FileInputStream(file), readlimit);
		is.mark(readlimit);
		initializeView(is);
	}

	private void initializeView(InputStream is) {
		mMovie = Movie.decodeStream(is);
		movieStart = 0;

		// prepare to stretch
		tmpBitmap = Bitmap.createBitmap(mMovie.width(), mMovie.height(),
				Bitmap.Config.ARGB_8888);
		tmpCanvas = new Canvas(tmpBitmap);
		src = new Rect(0, 0, tmpBitmap.getWidth(), tmpBitmap.getHeight());
		dst = new Rect(0, 0, 1, 1);

		this.invalidate();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		canvas.drawColor(Color.TRANSPARENT);
		super.onDraw(canvas);
		long now = android.os.SystemClock.uptimeMillis();
		if (movieStart == 0) {
			movieStart = now;
		}
		if (mMovie != null) {
			int dur = mMovie.duration();
			if (dur == 0) {
				dur = 1200;
			}
			int relTime = (int) ((now - movieStart) % dur);
			mMovie.setTime(relTime);

			// stretch to fit view
			mMovie.draw(tmpCanvas, 0, 0);
			dst.right = dst.left + getWidth();
			dst.bottom = dst.top + getHeight();
			canvas.drawBitmap(tmpBitmap, src, dst, null);

			this.invalidate();
		}
	}

}

参考