Android的搜索栏的正确使用？ [英] Correct usage of Android's SeekBar?

问题描述

我试图堵漏搜索栏进入我的视频应用程序，但它似乎并没有以往任何时候都达到栏的末尾。这里的code：

I tried plugging a SeekBar into my video app, but it doesn't seem to ever reach the end of the bar. Here's the code:

videoSeekBar = (SeekBar) activity.findViewById(R.id.videoPlayerSeek);
videoDuration = player.getDuration();
videoSeekBar.setMax(videoDuration);
videoSeekBar.setProgress(0);

// Start lengthy operation in a background thread
new Thread(new Runnable() {
    public void run() {
        while (videoPlayProgress < videoDuration) {
            videoPlayProgress = player.getCurrentPosition();

            // Update the progress bar
            handler.post(new Runnable() {
                public void run() {
                    videoSeekBar.setProgress(videoPlayProgress);
                }
            });
        }
    }
}).start();

然后，我有一个 OnCompleteListener 连接到的MediaPlayer。当它被调用时，

Then, I have an OnCompleteListener attached to the MediaPlayer. When it is called,

player.getCurrentPosition（）返回6209

player.getDuration（）返回6592

这不可能是正确的。此时，滑块状态指示器是不太在滑块的末端，但有一个微小的间隙。该视频的长度较短，更大的差距。

Which can't be right. At this point, the slider status indicator isn't quite at the end of the slider bar, but there's a slight gap. The shorter the video's length, the bigger the gap.

推荐答案

一，审议＆LT; = ，而不是＆LT; 。

更重要的是，你不需要或不想要这个忙循环后台线程。喜欢的东西去：

More importantly, you do not need or want a busy-loop background thread for this. Go with something like:

Runnable r=new Runnable() {
    public void run() {
        videoSeekBar.setProgress(player.getCurrentPosition());

        if (player.getCurrentPosition()<player.getDuration()) {
            videoSeekBar.postDelayed(r, 33);
        }
    }
};

和地方叫运行（）在研究，当你的视频启动。这将每秒更新搜索栏 30倍左右。

and somewhere call run() on r, when your video starts up. This will update the SeekBar about 30 times per second.

您目前的实现是前台繁忙的循环，张贴数千封邮件到主应用程序线程的队列中，这将使您的视频播放性能较差，废旧电池对没有特别的优势。

Your current implementation is a foreground busy loop, posting thousands of messages onto the main application thread's queue, which will make your video playback performance worse and waste battery for no particular advantage.

这仍然可能无法让所有的方式来结束 - 这有可能是视频将达到 setProgress（）呼叫和<$ C $之间到底C>如果测试。它是在最后的真正考验是 OnCompletionListener ，所以只要定位搜索栏末在该点

This still might not get all the way to the end -- it's possible that the video will reach the end between the setProgress() call and the if test. The true test of it being at the end is the OnCompletionListener, so just position the SeekBar at the end at that point.

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