QSFragment: fix NPE in setOverScrollAmount

Sometimes this method can be called before the fragment view has been created.
Adds a null check as a fix.

Test: QSFragmentTest
Fixes: 228991399
Change-Id: I950997fc35230196f855fd54fe23e0fb37ee9b9e

packages/SystemUI/src/com/android/systemui/qs/QSFragment.java

@@ -519,7 +519,10 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
     @Override
     public void setOverScrollAmount(int overScrollAmount) {
         mOverScrolling = overScrollAmount != 0;
-        getView().setTranslationY(overScrollAmount);
+        View view = getView();
+        if (view != null) {
+            view.setTranslationY(overScrollAmount);
+        }
     }
 
     @Override

packages/SystemUI/tests/src/com/android/systemui/qs/QSFragmentTest.java

@@ -315,6 +315,24 @@ public class QSFragmentTest extends SysuiBaseFragmentTest {
         verify(mQuickQSPanelController).setCollapseExpandAction(action);
     }
 
+    @Test
+    public void setOverScrollAmount_setsTranslationOnView() {
+        QSFragment fragment = resumeAndGetFragment();
+
+        fragment.setOverScrollAmount(123);
+
+        assertThat(mQsFragmentView.getTranslationY()).isEqualTo(123);
+    }
+
+    @Test
+    public void setOverScrollAmount_beforeViewCreated_translationIsNotSet() {
+        QSFragment fragment = getFragment();
+
+        fragment.setOverScrollAmount(123);
+
+        assertThat(mQsFragmentView.getTranslationY()).isEqualTo(0);
+    }
+
     @Override
     protected Fragment instantiate(Context context, String className, Bundle arguments) {
         MockitoAnnotations.initMocks(this);