Android 获取本地视频缩略图和某一帧的预览图

版权声明：如需转载请在明显位置保留作者信息及原文链接 https://blog.csdn.net/qq_24889075/article/details/51668777

由于项目需要显示本地视频的预览图
刚开始用缩略图可以显示（海马玩模拟器不可以 =.= 其他的没试）但是显示了不清晰因为是缩略图嘛
之后又找了一个预览某一帧的图片，很好用
特此记录。

我获取缩略图的代码：

Bitmap bitmap;
// 获取视频的缩略图
        bitmap = ThumbnailUtils.createVideoThumbnail(url, MediaStore.Images.Thumbnails.MICRO_KIND);
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, 600, 600, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
//这里的bitmap就是我们要的缩略图

我获取预览图的代码：

/** 获取视频第一帧图片 */
    private Bitmap createVideoThumbnail(String filePath) {
        Bitmap bitmap = null;
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        try {
            retriever.setDataSource(filePath);
            bitmap = retriever.getFrameAtTime();
        } catch (IllegalArgumentException ex) {
            // Assume this is a corrupt video file
        } catch (RuntimeException ex) {
            // Assume this is a corrupt video file.
        } finally {
            try {
                retriever.release();
            } catch (RuntimeException ex) {
                // Ignore failures while cleaning up.
            }
        }
        return bitmap;
    }

---

贴出获取预览图的源代码端详端详

获取预览图有三个重载的方法如下：

 public Bitmap getFrameAtTime() {
        return getFrameAtTime(-1, OPTION_CLOSEST_SYNC);
    }

 public Bitmap getFrameAtTime(long timeUs) {
        return getFrameAtTime(timeUs, OPTION_CLOSEST_SYNC);
    }

 public Bitmap getFrameAtTime(long timeUs, int option) {
        if (option < OPTION_PREVIOUS_SYNC || option > OPTION_CLOSEST) {
            throw new IllegalArgumentException("Unsupported option: " + option);
        }
        return _getFrameAtTime(timeUs, option);
    }

Option：

     /**
     * This option is used with {@link #getFrameAtTime(long, int)} to retrieve
     * a sync (or key) frame associated with a data source that is located
     * right before or at the given time.
     *
     * @see #getFrameAtTime(long, int)
     */
    public static final int OPTION_PREVIOUS_SYNC    = 0x00;
    /**
     * This option is used with {@link #getFrameAtTime(long, int)} to retrieve
     * a sync (or key) frame associated with a data source that is located
     * right after or at the given time.
     *
     * @see #getFrameAtTime(long, int)
     */
    public static final int OPTION_NEXT_SYNC        = 0x01;
    /**
     * This option is used with {@link #getFrameAtTime(long, int)} to retrieve
     * a sync (or key) frame associated with a data source that is located
     * closest to (in time) or at the given time.
     *
     * @see #getFrameAtTime(long, int)
     */
    public static final int OPTION_CLOSEST_SYNC     = 0x02;
    /**
     * This option is used with {@link #getFrameAtTime(long, int)} to retrieve
     * a frame (not necessarily a key frame) associated with a data source that
     * is located closest to or at the given time.
     *
     * @see #getFrameAtTime(long, int)
     */
    public static final int OPTION_CLOSEST          = 0x03;