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Simple Calculator For Android Application






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);
     
        b1 = (Button)findViewById(R.id.btn_0);
        b1.setOnClickListener(this);
     
        b2 = (Button)findViewById(R.id.btn_1);
        b2.setOnClickListener(this);
     
        b3 = (Button)findViewById(R.id.btn_2);
        b3.setOnClickListener(this);
     
        b4 = (Button)findViewById(R.id.btn_3);
        b4.setOnClickListener(this);
     
        b5 = (Button)findViewById(R.id.btn_4);
        b5.setOnClickListener(this);
     
        b6 = (Button)findViewById(R.id.btn_5);
        b6.setOnClickListener(this);
     
        b7 = (Button)findViewById(R.id.btn_6);
        b7.setOnClickListener(this);
     
        b8 = (Button)findViewById(R.id.btn_add);
        b8.setOnClickListener(this);
     
        b9 = (Button)findViewById(R.id.btn_div);
        b9.setOnClickListener(this);
     
        b11 = (Button)findViewById(R.id.btn_ans);
        b11.setOnClickListener(this);
     
        b12 = (Button)findViewById(R.id.btn_sub);
        b12.setOnClickListener(this);
     
        b13 = (Button)findViewById(R.id.btn_mul);
        b13.setOnClickListener(this);
     
        b14 = (Button)findViewById(R.id.btn_dot);
        b14.setOnClickListener(this);
     
        b15 = (Button)findViewById(R.id.btn_pm);
        b15.setOnClickListener(this);
     
        b16 = (Button)findViewById(R.id.btn_byx);
        b16.setOnClickListener(this);
     
        b17 = (Button)findViewById(R.id.btn_perc);
        b17.setOnClickListener(this);
     

        b18 = (Button)findViewById(R.id.btn_mr);
        b18.setOnClickListener(this);

        b19 = (Button)findViewById(R.id.btn_ms);
        b19.setOnClickListener(this);

        b21 = (Button)findViewById(R.id.btn_mc);
        b21.setOnClickListener(this);
     

        b22 = (Button)findViewById(R.id.btn_mplus);
        b22.setOnClickListener(this);

        b23 = (Button)findViewById(R.id.btn_msub);
        b23.setOnClickListener(this);
     

        b24 = (Button)findViewById(R.id.btn_c);
        b24.setOnClickListener(this);

        b25 = (Button)findViewById(R.id.btn_ce);
        b25.setOnClickListener(this);
     
        b26 = (Button)findViewById(R.id.btn_back);
        b26.setOnClickListener(this);
       
     
     
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


@Override
public void onClick(View v) {
// TODO Auto-generated method stub

switch(v.getId())
{

case R.id.btn_0:

String z = et1.getText().toString();

if(!z.equals("0"))
{
if(clear)
{
et1.setText("");
clear = false;
}

et1.setText(et1.getText() + "0");


}
break;



case R.id.btn_1:

if(clear)
{
et1.setText("");
clear = false;
}
opclick = true;
et1.setText(et1.getText() + "1");
break;

case R.id.btn_2:

if(clear)
{
et1.setText("");
clear = false;
}
opclick = true;
et1.setText(et1.getText() + "2");
break;

case R.id.btn_3:

if(clear)
{
et1.setText("");
clear = false;
}
opclick = true;
et1.setText(et1.getText() + "3");
break;

case R.id.btn_4:

if(clear)
{
et1.setText("");
clear = false;
}
opclick = true;
et1.setText(et1.getText() +"4");
break;

case R.id.btn_5:

if(clear)
{
et1.setText("");
clear = false;

}
opclick = true;
et1.setText(et1.getText() + "5");
break;

case R.id.btn_6:

if(clear)
{
et1.setText("");
clear = false;
}
opclick = true;
et1.setText(et1.getText() + "6");
break;

case R.id.btn_dot:

if(clear)
{
et1.setText("0");
clear = false;
}


if(dotcl)
{
et1.setText(et1.getText() + ".");
dotcl = false;
}

break;

case R.id.btn_ms:

mem = Double.parseDouble(et1.getText().toString());

break;

case R.id.btn_mc:

mem = 0.0;

break;


case R.id.btn_mr:


et1.setText(String.valueOf(mem));

break;


case R.id.btn_mplus:

mem =  mem + Double.parseDouble(et1.getText().toString());

break;


case R.id.btn_msub:

mem =  mem - Double.parseDouble(et1.getText().toString());


break;





case R.id.btn_add:

if(opclick)
{
if(first_move)
{
a = Double.parseDouble(et1.getText().toString());
first_move = false;


}

else
{
b = Double.parseDouble(et1.getText().toString());
result();
//et1.setText(String.valueOf(r));

a = r;

}

clear = true;

dotcl = true;
opclick = false;
}
op = 'a';

break;

case R.id.btn_pm:

tmp = Double.parseDouble(et1.getText().toString());
tmp = (-1) * tmp;
et1.setText(String.valueOf(tmp));


break;



case R.id.btn_byx:

tmp = Double.parseDouble(et1.getText().toString());
tmp = 1 / tmp;
et1.setText(String.valueOf(tmp));


break;



case R.id.btn_perc:

break;



case R.id.btn_c:

et1.setText("0");
clear = true;
dotcl = true;
first_move = true;



break;

case R.id.btn_ce:

et1.setText("0");
clear = true;
dotcl = true;

break;

case R.id.btn_back:

String s1 = et1.getText().toString();
if(s1.length() > 1)
{
String s2  = s1.substring(0, s1.length() - 1);
et1.setText(s2);
}
else
{
et1.setText("0");
clear = true;
}



break;


case R.id.btn_mul:

a = Double.parseDouble(et1.getText().toString());
clear = true;
op = 'm';
dotcl = true;

break;

case R.id.btn_sub:


if(opclick)
{
if(first_move)
{
a = Double.parseDouble(et1.getText().toString());
first_move = false;


}

else
{
b = Double.parseDouble(et1.getText().toString());
result();
//et1.setText(String.valueOf(r));

a = r;

}

clear = true;

dotcl = true;
opclick = false;
}

op = 's';

break;

case R.id.btn_div:

break;

case R.id.btn_ans:

b = Double.parseDouble(et1.getText().toString());
result();
//et1.setText(String.valueOf(r));
clear = true;
a = r;

break;





}




}
 
private void result()
{

switch(op)
{
case 'a':
r = a+b;

break;

case 's':
r = a-b;

break;


case 'm':

r = a*b;
break;


case 'd':
r = a/b;

break;





}

String result = String.valueOf(r);

String[] parts = result.split(".0");



if(parts.length <= 1)
{
et1.setText(parts[0]);

}
else
{
et1.setText(result);
}



}

}




 Acitivty _main.xml





<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:cursorVisible="false" android:ems="10" android:gravity="right" android:text="0" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_mc" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="MC" /> <Button android:id="@+id/btn_mr" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="MR" /> <Button android:id="@+id/btn_ms" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="MS" /> <Button android:id="@+id/btn_mplus" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="M+" /> <Button android:id="@+id/btn_msub" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="M-" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_back" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="&lt;--" /> <Button android:id="@+id/Button21" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> <Button android:id="@+id/Button24" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> <Button android:id="@+id/btn_ce" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="CE" /> <Button android:id="@+id/btn_c" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="C" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/Button17" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> <Button android:id="@+id/Button16" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> <Button android:id="@+id/Button19" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> <Button android:id="@+id/btn_div" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="/" /> <Button android:id="@+id/btn_byx" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="1/x" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_4" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="4" /> <Button android:id="@+id/btn_5" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="5" /> <Button android:id="@+id/btn_6" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="6" /> <Button android:id="@+id/btn_mul" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="*" /> <Button android:id="@+id/btn_perc" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="%" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_1" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="1" /> <Button android:id="@+id/btn_2" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="2" /> <Button android:id="@+id/btn_3" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="3" /> <Button android:id="@+id/btn_sub" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="-" /> <Button android:id="@+id/Button05" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="Button" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_pm" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="+/-" /> <Button android:id="@+id/btn_0" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="0" /> <Button android:id="@+id/btn_dot" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="." /> <Button android:id="@+id/btn_add" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="+" /> <Button android:id="@+id/btn_ans" style="?android:attr/buttonStyleSmall" android:layout_width="60dp" android:layout_height="wrap_content" android:text="=" /> </LinearLayout> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> </LinearLayout>










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