Fix crash between Android 4.0 and Android 5.1

* java/org/gnu/emacs/EmacsService.java (detectMouse): Don't use
function that is not present on Android 4.0.

1 files changed, 16 insertions, 2 deletions

diff --git a/java/org/gnu/emacs/EmacsService.java b/java/org/gnu/emacs/EmacsService.java
index 820befb52d2..e1fd2dbffda 100644
--- a/java/org/gnu/emacs/EmacsService.java
+++ b/java/org/gnu/emacs/EmacsService.java
@@ -491,6 +491,8 @@ public final class EmacsService extends Service
     int i;
 
     if (Build.VERSION.SDK_INT
+        /* Android 4.0 and earlier don't support mouse input events at
+           all.  */
         < Build.VERSION_CODES.JELLY_BEAN)
       return false;
 
@@ -504,8 +506,20 @@ public final class EmacsService extends Service
         if (device == null)
           continue;
 
-        if (device.supportsSource (InputDevice.SOURCE_MOUSE))
-          return true;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
+          {
+            if (device.supportsSource (InputDevice.SOURCE_MOUSE))
+              return true;
+          }
+        else
+          {
+            /* `supportsSource' is only present on API level 21 and
+               later, but earlier versions provide a bit mask
+               containing each supported source.  */
+
+            if ((device.getSources () & InputDevice.SOURCE_MOUSE) != 0)
+              return true;
+          }
       }
 
     return false;