Added a way to print stack traces on Android

Author: shai-almog

CodenameOne/src/com/codename1/impl/CodenameOneImplementation.java

@@ -8724,6 +8724,22 @@ public void announceForAccessibility(Component cmp, String text) {
         // should override this method.
     }
 
+    /**
+     * Returns the stack trace from the exception on the given
+     * thread. This API isn't supported on all platforms and may
+     * return a blank string when unavailable.
+     *
+     * @param parentThread the thread in which the exception was thrown
+     * @param t the exception
+     * @return a stack trace string that might be blank
+     */
+    public String getStackTrace(Thread parentThread, Throwable t) {
+        if (parentThread instanceof CodenameOneThread && ((CodenameOneThread) parentThread).hasStackFrame()) {
+            return ((CodenameOneThread) parentThread).getStack(t);
+        }
+        return "";
+    }
+
     class RPush implements Runnable {
         public void run() {
             final long pushId = Preferences.get("push_id", (long) -1);

CodenameOne/src/com/codename1/ui/Display.java

@@ -1118,6 +1118,19 @@ void mainEDTLoop() {
         INSTANCE.edt = null;
     }
 
+    /**
+     * Returns the stack trace from the exception on the given
+     * thread. This API isn't supported on all platforms and may
+     * return a blank string when unavailable.
+     *
+     * @param parentThread the thread in which the exception was thrown
+     * @param t the exception
+     * @return a stack trace string that might be blank
+     */
+    public String getStackTrace(Thread parentThread, Throwable t) {
+        return impl.getStackTrace(parentThread, t);
+    }
+
     /**
      * Implementation of the event dispatch loop content
      */