How To Make a Simple Calculation Application in Eclipse

First, make a new project by clicking file > new > Android Application Project

Click Next

You could change the icon, but let's just skip it.

You can try the other activity, but in this project, I'm using the blank one.

Here, you can change the name of activity, let's leave it as default.

Click the activity_main.xml beside the graphical layout, and type these script.

Open the Activity by expanding ProjectName > src >com.example.ProjectName > ActivityName.java and then type this script

Export the project by clicking file > export

Click Next

Choose the project you want to export

Select Create new keystore if you don't have one, but if tou have you can use your existing keystore

Fill the form with anything you like, for example mine here

Select the project destination and your apk file will be there.

Ps;
Sorry i'm late, because of this....