Stretch screen in Android

I’m devloping an Android game. Unlucky, the android device has much Resolution. I set default size of game is 480x720 by:

// main.cpp in folder ...project/jni/helloworld
void Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*  env, jobject thiz, jint w, jint h)
{

....
 view->create(480, 720);
....
}

But, in other device different Ratio, game has 2 black area around. So, how can i stretch my game to full screen. I don’t need correct Ratio, only stretch. I speak english not well. Thank alot!