[Solved] How to customize hello message for media app in android auto?

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You can use the setErrorMessage() in the PlaybackStateCompat class to accomplish this. When the PlaybackStateCompat is assigned to a Media Session, its used to describe the current operational state of the player.

private void playbackStateErrorMessage(int code, String message) {
    PlaybackStateCompat.Builder playbackStateBuilder = new PlaybackStateCompat.Builder();
    playbackStateBuilder.setState(PlaybackStateCompat.STATE_ERROR, -1L, 1.0F);
    playbackStateBuilder.setErrorMessage(code, message);
    mSession.setPlaybackState(playbackStateBuilder.build());
}

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solved How to customize hello message for media app in android auto?