Kutties let us atrt with the basic program in android .. creating a calulator !!
main.xml file
you may not understand what is main.xml .. so v can do onething go to developers.android.com and study the basics .. http://developer.android.com/index.html#
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#33b5e5"
>
<EditText
android:id="@+id/selection"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#33b5e5"
android:gravity="right"
android:hint="@string/message"
android:singleLine="true" />
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/button7"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage7"
android:text="@string/seven" />
<Button
android:id="@+id/button8"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage8"
android:text="@string/eight" />
<Button
android:id="@+id/button9"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage9"
android:text="@string/nine" android:shadowColor="#0f0"/>
<Button
android:id="@+id/buttondiv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessagediv"
android:text="@string/div" />
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/button4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage4"
android:text="@string/four" />
<Button
android:id="@+id/button5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage5"
android:text="@string/five" />
<Button
android:id="@+id/button6"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage6"
android:text="@string/six" />
<Button
android:id="@+id/buttonmul"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessagemul"
android:text="@string/multi" />
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage"
android:text="@string/one" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage2"
android:text="@string/two" />
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage3"
android:text="@string/three" />
<Button
android:id="@+id/buttonminus"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessageminus"
android:text="@string/minus" />
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/button0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessage0"
android:text="@string/zero" />
<Button
android:id="@+id/button10"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessageplus"
android:text="@string/plus" />
<Button
android:id="@+id/buttonequal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessageequal"
android:text="@string/equal" />
<Button
android:id="@+id/buttonC"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessageC"
android:text="@string/C" />
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/buttondelete"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessagedelete"
android:text="@string/delete" />
<Button
android:id="@+id/buttonsqrt"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessagesqrt"
android:text="@string/sqrt" />
<Button
android:id="@+id/buttonbyx"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="sendMessagebyx"
android:text="@string/byx" />
</LinearLayout>
</LinearLayout>
string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">CALCULATE</string>
<string name="app_name">Calculator</string>
<string name="message">Enter ur Numbers</string>
<string name="one">1</string>
<string name="two">2</string>
<string name="three">3</string>
<string name="four">4</string>
<string name="zero">0</string>
<string name="five">5</string>
<string name="six">6</string>
<string name="seven">7</string>
<string name="eight">8</string>
<string name="nine">9</string>
<string name="equal">=</string>
<string name="C">C</string>
<string name="byx">1/x</string>
<string name="sqrt">sqrt</string>
<string name="delete">delete</string>
<string name="plus">+</string>
<string name="div">/</string>
<string name="multi">*</string>
<string name="minus">-</string>
</resources>
CalculateActivity.java
package com.sangeeth.cal;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class CalculateActivity extends Activity {
boolean flag = true;
Double sqrtnum;
String str,s;
Integer temp=0 ;
Integer temp2=0;
Integer tot=0;
char opt;
boolean show = true;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void sendMessage(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut = (Button) findViewById(R.id.button1);
String j = numbut.getText().toString();
no.setText(no.getText() + j);
}
public void sendMessage0(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut = (Button) findViewById(R.id.button0);
String j = numbut.getText().toString();
no.setText(no.getText() + j);
}
public void sendMessage2(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button2);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage3(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button3);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage4(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button4);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage5(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button5);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage6(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button6);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage7(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button7);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage8(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button8);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessage9(View view) {
EditText no = (EditText) findViewById(R.id.selection);
if(show == true)
{
no.setText("");
show = false;
}
Button numbut2 = (Button) findViewById(R.id.button9);
String j2 = numbut2.getText().toString();
no.setText(no.getText() + j2);
}
public void sendMessageplus(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
if(flag)
{
temp=Integer.parseInt(no.getText().toString());
flag=false;
show = true;
no.setText("");
opt='+';
}
else
{
show = true;
temp2=Integer.parseInt(no.getText().toString());
tot=temp+temp2;
no.setText(tot.toString());
flag = true;
opt='+';
}
}
public void sendMessagesqrt(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
temp=Integer.parseInt(no.getText().toString());
sqrtnum= (Double) Math.sqrt(temp);
String str=sqrtnum.toString();
no.setText(str);
flag=true;
show=true;
}
public void sendMessagebyx(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
Double temp9=Double.parseDouble(no.getText().toString());
Double byx=1/temp9;
String ss=byx.toString();
no.setText(ss);
flag=true;
show=true;
}
public void sendMessageminus(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
if(flag)
{
temp=Integer.parseInt(no.getText().toString());
flag=false;
show = true;
no.setText("");
opt='-';
}
else
{
show = true;
temp2=Integer.parseInt(no.getText().toString());
tot=temp-temp2;
no.setText(tot.toString());
flag = true;
opt='-';
}
}
public void sendMessagemul(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
if(flag)
{
temp=Integer.parseInt(no.getText().toString());
flag=false;
show = true;
no.setText("");
opt='*';
}
else
{
show = true;
temp2=Integer.parseInt(no.getText().toString());
tot=temp*temp2;
no.setText(tot.toString());
flag = true;
opt='*';
}
}
public void sendMessagediv(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
if(flag)
{
temp=Integer.parseInt(no.getText().toString());
flag=false;
show = true;
no.setText("");
opt='/';
}
else
{
show = true;
temp2=Integer.parseInt(no.getText().toString());
tot=temp/temp2;
no.setText(tot.toString());
flag = true;
opt='/';
}
}
public void sendMessageC(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
no.setText("");
flag=true;
show=true;
}
public void sendMessagedelete(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
str=no.getText().toString();
s = str.substring(0, str.length() - 1);
no.setText(s);
}
public void sendMessageequal(View view)
{
EditText no = (EditText) findViewById(R.id.selection);
temp2=Integer.parseInt(no.getText().toString());
switch (opt)
{
case '+':
tot=temp+temp2;
show = true;
flag=true;
break;
case '-':
tot=temp-temp2;
flag=true;
show = true;
break;
case '*':
tot=temp*temp2;
flag=true;
show = true;
break;
case '/':
tot=temp/temp2;
show = true;
flag=true;
break;
}
no.setText(tot.toString());
}
}
