How to press a key in Robotium?

In this article we are going to see how to press hardware keys of an Android device while performing Unit Testing using robotium framework.Now a days, most of the device do not have hardware keys. But, Android handles those keys separately than soft keys.

After Initiating solo, we need to use the object of solo.

 
-To press Up button
solo.sendKey(Solo.UP);

-To press Down
solo.sendKey(Solo.DOWN);

-To press Back button
solo.goBack();

-To press Right
solo.sendKey(Solo.RIGHT);

-To press Left
solo.sendKey(Solo.LEFT);

-To press Enter(Like pressing ok)
solo.sendKey(Solo.ENTER);

-To press Menu
solo.sendKey(Solo.MENU);

-To press Delete
solo.sendKey(Solo.DELETE);

Note ; All of them represents a integer value
RIGHT = 22
LEFT =21
UP=19
DOWN=20
ENTER=66
MENU=82
DELETE =67

If we integer value in place of that static code, it will work perfectly. Like in case of pressing UP
solo.sendKey(19);

Thanks...:)