android MediaPlayer start called in state 2

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描述

void previewVideo() {
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    if (segmentArray.size() > 0 && surfaceCreated) {
        try {
            if (mPlayer == null) {
                mPlayer = new MediaPlayer();
            }
            currentPreviewIndex = 0;
            mPlayer.setDataSource(segmentArray.get(0));
            mPlayer.setSurface(dataBinding.previewSurfaceView.getHolder().getSurface());
            mPlayer.setOnCompletionListener(mediaPlayerComplete);
            mPlayer.start();
        } catch (IOException e) {
            releaseMediaPlayer();
        }
    }
}
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09-30 16:40:22.217 1836-1836/com.caiyi.youle E/MediaPlayer: start called in state 2
09-30 16:40:22.217 1836-1836/com.caiyi.youle E/MediaPlayer: error (-38, 0)
09-30 16:40:22.349 1836-1836/com.caiyi.youle E/MediaPlayer: Error (-38,0)

原因：没有调用 prepare