The realization source of Calculator

Package com.example.cal;

Import Android. R.integer;

Import Android.os.Bundle;

Import android.app.Activity;

Import Android.view.Menu;

Import Android.view.View;

Import Android.widget.Button;

Import Android.widget.EditText;

Import Android.widget.ImageButton;

public class Mainactivity extends Activity {

Private ImageButton One, three, Four,five,six,seven,eight,nine,zero,add,

Dividion,equal,minus,product;

EditText et;

String Num,backnum,allnum;

int I,backi,alli;

int logo;

@Override

protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.activity_main);

et= (EditText) Findviewbyid (r.id.et_num);

zero= (ImageButton) Findviewbyid (R.ID.IB_0);

One= (ImageButton) Findviewbyid (r.id.ib_1);

two= (ImageButton) Findviewbyid (r.id.ib_2);

Three= (ImageButton) Findviewbyid (r.id.ib_3);

Four= (ImageButton) Findviewbyid (r.id.ib_4);

Five= (ImageButton) Findviewbyid (r.id.ib_5);

six= (ImageButton) Findviewbyid (r.id.ib_6);

Seven= (ImageButton) Findviewbyid (r.id.ib_7);

eight= (ImageButton) Findviewbyid (r.id.ib_8);

Nine= (ImageButton) Findviewbyid (r.id.ib_9);

Add= (ImageButton) Findviewbyid (R.id.loga_add);

dividion= (ImageButton) Findviewbyid (r.id.dividion);

Minus= (ImageButton) Findviewbyid (R.id.minus);

product= (ImageButton) Findviewbyid (R.id.pro);

Equal= (ImageButton) Findviewbyid (r.id.equal);

}

public void init () {

et= (EditText) Findviewbyid (r.id.et_num);

zero= (Button) Findviewbyid (R.ID.IB_0);

one= (Button) Findviewbyid (r.id.ib_1);

two= (Button) Findviewbyid (r.id.ib_2);

three= (Button) Findviewbyid (r.id.ib_3);

four= (Button) Findviewbyid (r.id.ib_4);

five= (Button) Findviewbyid (r.id.ib_5);

six= (Button) Findviewbyid (r.id.ib_6);

seven= (Button) Findviewbyid (r.id.ib_7);

eight= (Button) Findviewbyid (r.id.ib_8);

nine= (Button) Findviewbyid (r.id.ib_9);

add= (Button) Findviewbyid (R.id.loga_add);

dividion= (Button) Findviewbyid (r.id.dividion);

minus= (Button) Findviewbyid (R.id.minus);

product= (Button) Findviewbyid (R.id.pro);

equal= (Button) Findviewbyid (r.id.equal);

//}

public void One (View v) {

Et.append ("1");

}

public void (View v) {

Et.append ("2");

}

public void Three (View v) {

Et.append ("3");

}

public void Four (View v) {

Et.append ("4");

}

public void Five (View v) {

Et.append ("5");

}

public void Six (View v) {

Et.append ("6");

}

public void Seven (View v) {

Et.append ("7");

}

public void Eight (View v) {

Et.append ("8");

}

public void Nine (View v) {

Et.append ("9");

}

public void Zero (View v) {

Et.append ("0");

}

When you click the plus sign

public void Add (View v) {

Num=et.gettext (). toString ();

if (Num.equals ("")) {

Et.settext ("");

}else{

i = Integer.parseint (num);

Logo=1;

Et.settext ("");}

}

When you click the minus sign

public void minus (View v) {

Num=et.gettext (). toString ();

if (Num.equals ("")) {

Et.settext ("");

}else{

I=integer.parseint (num);

logo=2;

Et.settext ("");}

}

When you click Multiplication sign

public void product (View v) {

Num=et.gettext (). toString ();

if (Num.equals ("")) {

Et.settext ("");

}else{

I=integer.parseint (num);

logo=3;

Et.settext ("");}

}

When you click Division Sign

public void Dividion (View v) {

Num=et.gettext (). toString ();

if (Num.equals ("")) {

Et.settext ("");

}else{

I=integer.parseint (num);

logo=4;

Et.settext ("");}

}

public void Back (View v) {

Num=et.gettext (). toString ();

if (Num.equals ("")) {

Et.settext ("");

}else{

String mnum=num.substring (0, Num.length ()-1);

Et.settext (mnum);}

}

When you click the equals sign

public void equal (View v) {

Backnum=et.gettext (). toString ();

if (Backnum.equals ("")) {

Et.settext ("");

}else{

Backi=integer.parseint (Backnum);

if (logo==1) {

Alli=i+backi;

Backnum=integer.tostring (Alli);

Et.settext (Backnum);

}else if (logo==2) {

Alli=i-backi;

Backnum=integer.tostring (Alli);

Et.settext (Backnum);

}else if (logo==3) {

Alli=i*backi;

Backnum=integer.tostring (Alli);

Et.settext (Backnum);

}else{

Alli=i/backi;

Backnum=double.tostring (Alli);

Et.settext (Backnum);

}}

}

@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;

}

}

The realization source of Calculator