Ignore drag action on the switch button of MasterSwitchPreference

MasterSwitchPreference provides a toggle switch and it only
acts for clicking events. This fix consumes move events to
ignore drag actions.

Bug: 148770615
Test: make RunSettingsRoboTests ROBOTEST_FILTER=MasterSwitchPreferenceTest
      Manually drag the switch button of MasterSwitchPreference and
      observe the switch state is not changed.
Change-Id: I0d8b947b32d35b85403fc65605c18c09a4053135

src/com/android/settings/widget/MasterSwitchPreference.java

@@ -18,6 +18,7 @@ package com.android.settings.widget;
 
 import android.content.Context;
 import android.util.AttributeSet;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Switch;
@@ -81,6 +82,11 @@ public class MasterSwitchPreference extends RestrictedPreference {
                     }
                 }
             });
+
+            // Consumes move events to ignore drag actions.
+            switchWidget.setOnTouchListener((v, event) -> {
+                return event.getActionMasked() == MotionEvent.ACTION_MOVE;
+            });
         }
 
         mSwitch = (Switch) holder.findViewById(R.id.switchWidget);