Guard NPE in RingtonePrefController

Fixes: 126416474
Test: robotests
Change-Id: I02d0279ae107e7c03668849beaea8aa0463b4da6

src/com/android/settings/notification/RingtonePreferenceControllerBase.java

@@ -50,13 +50,18 @@ public abstract class RingtonePreferenceControllerBase extends AbstractPreferenc
     }
 
     private void updateSummary(Preference preference) {
-        Uri ringtoneUri = RingtoneManager.getActualDefaultRingtoneUri(mContext, getRingtoneType());
+        final Uri ringtoneUri = RingtoneManager.getActualDefaultRingtoneUri(
-        final CharSequence summary = Ringtone.getTitle(
+                mContext, getRingtoneType());
+
+        final CharSequence summary;
+        if (ringtoneUri == null) {
+            summary = null;
+        } else {
+            summary = Ringtone.getTitle(
                     mContext, ringtoneUri, false /* followSettingsUri */, true /* allowRemote */);
+        }
         if (summary != null) {
-            ThreadUtils.postOnMainThread(() -> {
+            ThreadUtils.postOnMainThread(() -> preference.setSummary(summary));
-                preference.setSummary(summary);
-            });
         }
     }
 

tests/robotests/src/com/android/settings/notification/RingtonePreferenceControllerBaseTest.java

@@ -20,31 +20,31 @@ import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
 import android.content.Context;
 import android.media.RingtoneManager;
+import android.provider.Settings;
 
 import androidx.preference.Preference;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
 
 @RunWith(RobolectricTestRunner.class)
 public class RingtonePreferenceControllerBaseTest {
 
-    @Mock
     private Context mContext;
 
     private RingtonePreferenceControllerBase mController;
 
     @Before
     public void setUp() {
-        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
         mController = new RingtonePreferenceControllerBaseTestable(mContext);
     }
 
@@ -56,12 +56,24 @@ public class RingtonePreferenceControllerBaseTest {
     @Test
     public void updateState_shouldSetSummary() {
         Preference preference = mock(Preference.class);
+        Settings.System.putString(mContext.getContentResolver(), Settings.System.RINGTONE,
+                "content://test/ringtone");
 
         mController.updateState(preference);
 
         verify(preference).setSummary(anyString());
     }
 
+    @Test
+    public void updateState_nullRingtone_shouldNotGetTitle() {
+        Preference preference = mock(Preference.class);
+        Settings.System.putString(mContext.getContentResolver(), Settings.System.RINGTONE, null);
+
+        mController.updateState(preference);
+
+        verify(preference, never()).setSummary(anyString());
+    }
+
     private class RingtonePreferenceControllerBaseTestable
             extends RingtonePreferenceControllerBase {
         RingtonePreferenceControllerBaseTestable(Context context) {