可以通过以下代码来检测客户端连接和断开：

添加onStart和onStop方法：

@Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); // Connect to the media session mMediaBrowserCompat.connect(); }

@Override public void onStop() { super.onStop(); // Disconnect from the media session mMediaBrowserCompat.disconnect(); }

添加onConnected和onConnectionSuspended方法：

private final MediaBrowserCompat.ConnectionCallback mConnectionCallback = new MediaBrowserCompat.ConnectionCallback() { @Override public void onConnected() { // Called when the connection to the media browser is established super.onConnected(); mMediaControllerCompat = new MediaControllerCompat( MediaPlaybackServiceCompat.this, mMediaBrowserCompat.getSessionToken()); mMediaControllerCompat.registerCallback(mMediaControllerCallback); }

        @Override
        public void onConnectionSuspended() {
            // Called when the connection to the media browser is suspended
            super.onConnectionSuspended();
            if (mMediaControllerCompat != null) {
                mMediaControllerCompat.unregisterCallback(mMediaControllerCallback);
                mMediaControllerCompat = null;
            }
        }
    };

在onCreate方法中添加以下代码：

mMediaBrowserCompat = new MediaBrowserCompat(this, new ComponentName(this, MediaPlaybackServiceCompat.class), mConnectionCallback, null);

mMediaBrowserCompat.connect();

在onDestroy方法中添加以下代码：

if (mMediaControllerCompat != null) { mMediaControllerCompat.unregisterCallback(mMediaControllerCallback); mMediaControllerCompat = null; } if (mMediaBrowserCompat != null) { mMediaBrowserCompat.disconnect(); mMediaBrowserCompat = null; }

通过这些方法，您可以检测Android Auto客户端连接和断开连接。