Mark's coding playground...

This post explains how you can create a simple calculator in android. You can download the code and use. See xml class: <?xml version="1.0" encoding="utf-8"?> </LinearLayout > See Java class: public class Calculator extends Activity implements OnClickListener { EditText etNum1; EditText etNum2; Button btnAdd; Button btnSub; Button btnMult; Button btnDiv; TextView tvResult; String oper = ""; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_calculator); // find the elements etNum1 = (EditText) findViewById(R.id.etNum1); etNum2 = (EditText) findViewById(R.id.etNum2); btnAdd = (Button) findViewById(R.id.btnAdd); btnSub = (Button) findViewById(R.id.btnSub); btnMult = (Button) findViewById(R.id.btnM...