Android/VideoView/横幅に合わせて縦幅自動調節

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ViewGroup.LayoutParams params = videoView.getLayoutParams();
double aspect = (double) videoView.getMediaFileWidth() / videoView.getMediaFileHeight();
Log.i(TAG, "aspect=" + aspect);
Log.i(TAG, "width=" + videoView.getWidth());
int height = (int) (videoView.getWidth() / aspect); // getWidth()はonWindowFocusChanged実行後取得可能
params.height = height;