Android Codest

Calculator App's Main Activity .java package com.nm.calc; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity implements OnClickListener { Button b1,b2,b3,b4,b5,b6,b7,b8,b9; Button b11,b12,b13,b14,b15,b16,b17,b18,b19; Button b21,b22,b23,b24,b25,b26,b27,b28,b29; EditText et1; double a,b,r,tmp,mem; char op; boolean dotcl=true,clear = true, first_move = true, opclick = true;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);               et1 = (EditText)findViewById(R.id.editText1);             ...