android MediaPlayer 的SeekTo 方法

android使用 mediaPlayer 播放video视频过程中, 当用户退出当前播放，再从后台恢复播放时，需要跳转到之前退出的时间点继续播放。

使用的方法基本都是 SeekTo 之前的时间点，但是经常遇到恢复播放时位置不准的问题，而且甚至有重头开始播放的现象。这个是因为SeekTo是回到上一时间点附近的关键帧导致的。

针对这个问题，在最新的android 8.0平台上，已经有了新的解决方案：

SeekTo() 方法在android O 平台新增了一个多参数的方法：

void seekTo（long msec, @SeekMode int mode）

这里的Mode 传入

int SEEK_CLOSEST = 0x03

就不会出现播放视频位置不准确的现象了。

/*** Seek modes used in method seekTo(long, int) to move media position* to a specified location.** Do not change these mode values without updating their counterparts* in include/media/IMediaSource.h!*//*** This mode is used with {@link #seekTo(long, int)} to move media position to* a sync (or key) frame associated with a data source that is located* right before or at the given time.** @see #seekTo(long, int)*/public static final int SEEK_PREVIOUS_SYNC    = 0x00;/*** This mode is used with {@link #seekTo(long, int)} to move media position to* a sync (or key) frame associated with a data source that is located* right after or at the given time.** @see #seekTo(long, int)*/public static final int SEEK_NEXT_SYNC        = 0x01;/*** This mode is used with {@link #seekTo(long, int)} to move media position to* a sync (or key) frame associated with a data source that is located* closest to (in time) or at the given time.** @see #seekTo(long, int)*/public static final int SEEK_CLOSEST_SYNC     = 0x02;/*** This mode is used with {@link #seekTo(long, int)} to move media position to* a frame (not necessarily a key frame) associated with a data source that* is located closest to or at the given time.** @see #seekTo(long, int)*/public static final int SEEK_CLOSEST          = 0x03;/** @hide */@IntDef(value = {SEEK_PREVIOUS_SYNC,SEEK_NEXT_SYNC,SEEK_CLOSEST_SYNC,SEEK_CLOSEST,})@Retention(RetentionPolicy.SOURCE)public @interface SeekMode {}private native final void _seekTo(long msec, int mode);/*** Moves the media to specified time position by considering the given mode.* <p>* When seekTo is finished, the user will be notified via OnSeekComplete supplied by the user.* There is at most one active seekTo processed at any time. If there is a to-be-completed* seekTo, new seekTo requests will be queued in such a way that only the last request* is kept. When current seekTo is completed, the queued request will be processed if* that request is different from just-finished seekTo operation, i.e., the requested* position or mode is different.** @param msec the offset in milliseconds from the start to seek to.* When seeking to the given time position, there is no guarantee that the data source* has a frame located at the position. When this happens, a frame nearby will be rendered.* If msec is negative, time position zero will be used.* If msec is larger than duration, duration will be used.* @param mode the mode indicating where exactly to seek to.* Use {@link #SEEK_PREVIOUS_SYNC} if one wants to seek to a sync frame* that has a timestamp earlier than or the same as msec. Use* {@link #SEEK_NEXT_SYNC} if one wants to seek to a sync frame* that has a timestamp later than or the same as msec. Use* {@link #SEEK_CLOSEST_SYNC} if one wants to seek to a sync frame* that has a timestamp closest to or the same as msec. Use* {@link #SEEK_CLOSEST} if one wants to seek to a frame that may* or may not be a sync frame but is closest to or the same as msec.* {@link #SEEK_CLOSEST} often has larger performance overhead compared* to the other options if there is no sync frame located at msec.* @throws IllegalStateException if the internal player engine has not been* initialized* @throws IllegalArgumentException if the mode is invalid.*/public void seekTo(long msec, @SeekMode int mode) {if (mode < SEEK_PREVIOUS_SYNC || mode > SEEK_CLOSEST) {final String msg = "Illegal seek mode: " + mode;throw new IllegalArgumentException(msg);}// TODO: pass long to native, instead of truncating here.if (msec > Integer.MAX_VALUE) {Log.w(TAG, "seekTo offset " + msec + " is too large, cap to " + Integer.MAX_VALUE);msec = Integer.MAX_VALUE;} else if (msec < Integer.MIN_VALUE) {Log.w(TAG, "seekTo offset " + msec + " is too small, cap to " + Integer.MIN_VALUE);msec = Integer.MIN_VALUE;}_seekTo(msec, mode);}

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android MediaPlayer 的SeekTo 方法

android使用 mediaPlayer 播放video视频过程中, 当用户退出当前播放，再从后台恢复播放时，需要跳转到之前退出的时间点继续播放。

使用的方法基本都是 SeekTo 之前的时间点，但是经常遇到恢复播放时位置不准的问题，而且甚至有重头开始播放的现象。这个是因为SeekTo是回到上一时间点附近的关键帧导致的。

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