Have volume UI dismiss on home button press.

Register a receiver that listens for Intent.ACTION_CLOSE_SYSTEM_DIALOGS
and dismisses the volume UI when such an intent is received.

Bug: 149228466
Test: Manual
Change-Id: Iabb706b1d4cc54cb84f228aad95bfdb7e6f75851

packages/CarSystemUI/src/com/android/systemui/volume/CarVolumeDialogImpl.java

@@ -25,8 +25,11 @@ import android.app.Dialog;
 import android.app.KeyguardManager;
 import android.car.Car;
 import android.car.media.CarAudioManager;
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.res.TypedArray;
 import android.content.res.XmlResourceParser;
 import android.graphics.Color;
@@ -38,6 +41,7 @@ import android.os.Debug;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
+import android.os.UserHandle;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.util.SparseArray;
@@ -171,6 +175,17 @@ public class CarVolumeDialogImpl implements VolumeDialog {
                 mCarAudioManager.registerCarVolumeCallback(mVolumeChangeCallback);
             };
 
+    private final BroadcastReceiver mHomeButtonPressedBroadcastReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (!intent.getAction().equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
+                return;
+            }
+
+            dismissH(Events.DISMISS_REASON_VOLUME_CONTROLLER);
+        }
+    };
+
     public CarVolumeDialogImpl(Context context) {
         mContext = context;
         mKeyguard = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE);
@@ -204,12 +219,18 @@ public class CarVolumeDialogImpl implements VolumeDialog {
     @Override
     public void init(int windowType, Callback callback) {
         initDialog();
+
+        mContext.registerReceiverAsUser(mHomeButtonPressedBroadcastReceiver, UserHandle.CURRENT,
+                new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS), /* broadcastPermission= */
+                null, /* scheduler= */ null);
     }
 
     @Override
     public void destroy() {
         mHandler.removeCallbacksAndMessages(/* token= */ null);
 
+        mContext.unregisterReceiver(mHomeButtonPressedBroadcastReceiver);
+
         cleanupAudioManager();
     }