Fix NPE in InsertionPointCursorController.onTouchEvent

Calls to SelectionModifierCursorController must be guarded by
hasSelectionController() because it's possible to have a TextView
with an Editor but no selection controller if the TextView is
configured to have non-selectable text.

Bug: 147366705
Bug: 145535274
Bug: 143852764
Test: Manual and unit test
  atest FrameworksCoreTests:EditorCursorDragTest
Change-Id: I7fdec754e6fa51561b08fab024ea672c43f2c8f5

2 files changed, 19 insertions, 1 deletions

diff --git a/core/java/android/widget/Editor.java b/core/java/android/widget/Editor.java
index 20af76b0d5ca..f851e10fa4f6 100644
--- a/core/java/android/widget/Editor.java
+++ b/core/java/android/widget/Editor.java
@@ -5737,7 +5737,7 @@ public class Editor {
         private boolean mIsDraggingCursor;
 
         public void onTouchEvent(MotionEvent event) {
-            if (getSelectionController().isCursorBeingModified()) {
+            if (hasSelectionController() && getSelectionController().isCursorBeingModified()) {
                 return;
             }
             switch (event.getActionMasked()) {
diff --git a/core/tests/coretests/src/android/widget/EditorCursorDragTest.java b/core/tests/coretests/src/android/widget/EditorCursorDragTest.java
index 89c237498e5c..8c9b4d071c2d 100644
--- a/core/tests/coretests/src/android/widget/EditorCursorDragTest.java
+++ b/core/tests/coretests/src/android/widget/EditorCursorDragTest.java
@@ -67,6 +67,7 @@ public class EditorCursorDragTest {
         mOriginalFlagValue = Editor.FLAG_ENABLE_CURSOR_DRAG;
         Editor.FLAG_ENABLE_CURSOR_DRAG = true;
     }
+
     @After
     public void after() throws Throwable {
         Editor.FLAG_ENABLE_CURSOR_DRAG = mOriginalFlagValue;
@@ -356,6 +357,23 @@ public class EditorCursorDragTest {
         assertFalse(editor.getSelectionController().isCursorBeingModified());
     }
 
+    @Test // Reproduces b/147366705
+    public void testCursorDrag_nonSelectableTextView() throws Throwable {
+        String text = "Hello world!";
+        TextView tv = mActivity.findViewById(R.id.nonselectable_textview);
+        tv.setText(text);
+        Editor editor = tv.getEditorForTesting();
+
+        // Simulate a tap. No error should be thrown.
+        long event1Time = 1001;
+        MotionEvent event1 = downEvent(event1Time, event1Time, 20f, 30f);
+        mInstrumentation.runOnMainSync(() -> editor.onTouchEvent(event1));
+
+        // Swipe left to right. No error should be thrown.
+        onView(withId(R.id.nonselectable_textview)).perform(
+                dragOnText(text.indexOf("llo"), text.indexOf("!")));
+    }
+
     private static MotionEvent downEvent(long downTime, long eventTime, float x, float y) {
         return MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, x, y, 0);
     }