我正在尝试,用动画GIF创建一个视图..
当我尝试在模拟器中运行以下代码一切正常.但是当我尝试在真正的智能手机中运行时,没有任何反应..
我的看法:
public class GIFView extends View {
private Movie mMovie;
private long movieStart;
public GIFView(Context context) {
super(context);
initializeView();
}
public GIFView(Context context, AttributeSet attrs) {
super(context, attrs);
initializeView();
}
public GIFView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initializeView();
}
private void initializeView() {
InputStream is = getContext().getResources().openRawResource(
R.drawable.cookies2);
mMovie = Movie.decodeStream(is);
}
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.TRANSPARENT);
super.onDraw(canvas);
long now = android.os.SystemClock.uptimeMillis();
if (movieStart == 0) {
movieStart = (int) now;
}
if …我需要检测HTML 5中视频的所有帧更改,我尝试了以下代码,但我无法获得所有更改,只有我每秒可以获得8或9次更新..
<body>
<canvas id="Canvas" width="800" height="450" style="position:absolute; left:5; top:5">Can't Load Canvas</canvas>
<video id="videoPlay" muted controls>
<source src="assets/soccer.webm" type="video/webm">
<source src="assets/soccer.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
</body>
<script type="text/javascript">
videoPlay.addEventListener('timeupdate', function (){
putOverlay();
});
function putOverlay(){
console.log(videoPlay.currentTime);
console.log("another frame");
}
</script>
</html>
我也尝试了以下代码,但是随着时间的推移,使用定时器会导致帧与定时器给出的值之间失去同步.
<body>
<canvas id="LeCanvas" width="800" height="450" style="position:absolute; left:5; top:5">Can't Load Canvas</canvas>
<!-- Video -->
<video id="videoPlay" controls>
<source src="assets/soccer.webm" type="video/webm">
<source src="assets/soccer.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
</body> …