feature/android 257e49ff0d3: Fix crash between Android 4.0 and Android 5.1

[Po Lu]

branch: feature/android
commit 257e49ff0d333cd5b9967613cb14051d54dd054b
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    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.
---
 java/org/gnu/emacs/EmacsService.java | 18 ++++++++++++++++--
 1 file 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;