Add yield and sleep for the Android device.

git-svn-id: http://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@4658 dfc29bdd-3216-0410-991c-e03cc46cb475

examples/27.HelloWorld_Android/main.cpp

@@ -138,6 +138,7 @@ int run ( IrrlichtDevice *device )
 				stat->setText ( str.c_str() );
 			}
 		}
+		device->yield(); // probably nicer to the battery
 	}
 
 	return 1;

source/Irrlicht/Android/CIrrDeviceAndroid.cpp

@@ -121,10 +121,25 @@ bool CIrrDeviceAndroid::run()
 
 void CIrrDeviceAndroid::yield()
 {
+	struct timespec ts = {0,1};
+	nanosleep(&ts, NULL);	
 }
 
 void CIrrDeviceAndroid::sleep(u32 timeMs, bool pauseTimer)
 {
+	const bool wasStopped = Timer ? Timer->isStopped() : true;
+
+	struct timespec ts;
+	ts.tv_sec = (time_t) (timeMs / 1000);
+	ts.tv_nsec = (long) (timeMs % 1000) * 1000000;
+
+	if (pauseTimer && !wasStopped)
+		Timer->stop();
+
+	nanosleep(&ts, NULL);
+
+	if (pauseTimer && !wasStopped)
+		Timer->start();	
 }
 
 void CIrrDeviceAndroid::setWindowCaption(const wchar_t* text)