Android Development

[mobile_fan_2k5]

SIMPLE ADDING MACHINE (Beginner)
Tutorial is for people who already have eclipse installed and the SDK.
If not go here for info.
STEP1
Start up eclipse and start a new android project.
You can name your project add.
Then below that youll see properties
APPliCATION NAME: add
PACKAGE NAME:com.add
CREATE ACTIVITY:add
STEP2
In the res folder of the package explorer window youll see a layout folder. Enter a paste the following code into the main.xml file. You'll be pasting everything thus overwriting the previous code.

LAYOUT
Edit the XML file by cutting this code into it.

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget41"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff66ffff"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<Button
android:id="@+id/calBtn"
android:layout_width="96px"
android:layout_height="34px"
android:background="#ff0099ff"
android:text="Calculate"
android:textSize="18sp"
android:layout_x="104px"
android:layout_y="259px"
>
</Button>
<EditText
android:id="@+id/field1"
android:layout_width="167px"
android:layout_height="50px"
android:textSize="18sp"
android:layout_x="71px"
android:layout_y="45px"
>
</EditText>
<EditText
android:id="@+id/field2"
android:layout_width="164px"
android:layout_height="55px"
android:textSize="18sp"
android:layout_x="74px"
android:layout_y="183px"
>
</EditText>
<TextView
android:id="@+id/widget44"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="="
android:textSize="25sp"
android:textStyle="bold"
android:layout_x="133px"
android:layout_y="129px"
>
</TextView>
<TextView
android:id="@+id/answer"
android:layout_width="99px"
android:layout_height="29px"
android:textSize="19sp"
android:layout_x="124px"
android:layout_y="330px"
android:textColor="#ff000000">
</TextView>
<TextView
android:id="@+id/widget34"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="+"
android:layout_x="63px"
android:layout_y="128px"
>
</TextView>
<TextView
android:id="@+id/widget35"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RESULT:->"
android:textSize="18sp"
android:textColor="#ff000000"
android:layout_x="26px"
android:layout_y="333px"
>
</TextView>
<TextView
android:id="@+id/widget36"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="Operations:"
android:textSize="16sp"
android:layout_x="192px"
android:layout_y="81px"
>
</TextView>
<RadioButton
android:id="@+id/plus"
android:layout_width="wrap_content"
android:layout_height="41px"
android:text=" +"
android:layout_x="32px"
android:layout_y="124px"
>
</RadioButton>
<RadioButton
android:id="@+id/Mul"
android:layout_width="96px"
android:layout_height="wrap_content"
android:text=" *"
android:layout_x="100px"
android:layout_y="122px"
>
</RadioButton>
<RadioButton
android:id="@+id/minus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" -"
android:layout_x="170px"
android:layout_y="120px"
>
</RadioButton>
<RadioButton
android:id="@+id/div"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" /"
android:layout_x="237px"
android:layout_y="120px"
>
</RadioButton>
<ImageView
android:id="@+id/widget41"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_x="237px"
android:layout_y="38px"
>
</ImageView>
<TextView
android:id="@+id/widget42"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textStyle="bold|italic"
android:layout_x="102px"
android:layout_y="9px" android:textColor="#ff000000" android:text="CALCULATE">
</TextView>
</AbsoluteLayout>

The layout file, is the file that defines the actual interface of the application.

STEP3
In the src folder paste the following code below in the source file.
CODE

/*Date:July 12 , 2010
 *Program Developed by Andre Piper aka mobile_fan_2k5.
 *email:andrepiper@gmail.com
 */
package com.Calculate;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;
 
public  class Calculate extends Activity implements OnClickListener  
	{
	TextView answer;
	Button calculate;
	TextView number1,number2;
	RadioButton plus,minus,divide,multi;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //------------
        plus=(RadioButton)this.findViewById((R.id.plus));
        minus=(RadioButton)this.findViewById((R.id.minus));
        divide=(RadioButton)this.findViewById((R.id.div));
        multi=(RadioButton)this.findViewById((R.id.Mul));
        answer=(TextView)this.findViewById((R.id.answer));
        number1=(TextView)this.findViewById((R.id.field1));
        number2=(TextView)this.findViewById((R.id.field2));
        calculate=(Button)this.findViewById(R.id.calBtn);
        calculate.setOnClickListener(this);

    	
      
    }
    //-----BUTTON PRESSED
    public void onClick(View v){
    	if(calculate.isPressed())
    	{
    		if(plus.isChecked())
        	{
        	plusFunc();
        	plus.setChecked(false);//uncheck button
        	number1.setText("");
        	number2.setText("");
        	}
        	//------------
        	if(minus.isChecked())
        	{
        	minusFunc();
        	minus.setChecked(false);//uncheck button
        	number1.setText("");
        	number2.setText("");
        	}
        	//-----------
        	if(divide.isChecked())
        	{
        	divideFunc();
        	divide.setChecked(false);//uncheck button
        	number1.setText("");
        	number2.setText("");
        	}
        	//--------------
        	if(multi.isChecked())
        	{
        	multiFunc();
        	multi.setChecked(false);//uncheck button
        	number1.setText("");
        	number2.setText("");
        	}
    	}
    }
    //--------------------Doing the actual adding,minus,divide and multiplaication
    protected void plusFunc()
    {
    	double value1=Double.parseDouble(number1.getText().toString());
    	double value2=Double.parseDouble(number2.getText().toString());
    	double answer2=value1+value2;
    	answer.setText(Double.toString(answer2));
    }
    protected void minusFunc()
    {
    	double value1=Double.parseDouble(number1.getText().toString());
    	double value2=Double.parseDouble(number2.getText().toString());
    	double answer2=value1-value2;
    	answer.setText(Double.toString(answer2));
    }
    protected void divideFunc()
    {
    	double value1=Double.parseDouble(number1.getText().toString());
    	double value2=Double.parseDouble(number2.getText().toString());
    	
    	double answer2=value1/value2;
    	answer.setText(Double.toString(answer2));
    }
    protected void multiFunc()
    {
    	double value1=Double.parseDouble(number1.getText().toString());
    	double value2=Double.parseDouble(number2.getText().toString());
    	double answer2=value1*value2;
    	answer.setText(Double.toString(answer2));
    }
    
}

STEP4
Just run and you have an android app.
For a better tutorial check android sdk and android resources.

[RobyG]

Respect due, hey mobile_fan_2k5, can you provide screenshot(s) ?
Most people are visual and like to see what the end result will look like.

Screenshots go hand-in-hand with sample code

[mobile_fan_2k5]

I didnt have my claro 3g connection so hence the crappy tutorial.
source code


XML(layout)


SImulator Interface


App in action

[Yung_Jah]

Looking good....not bad....Cant wait to get to this stage....

[mobile_fan_2k5]

---------------------PHP+MYSQL + Android= Sweet-----------------------------
This topic is so problematic. I'm doing a project now that will need database access. This is a tutorial to access remote database with an android...

Things you'll need
1... PHP host with MYSQL
2... And you'll need SDK with handset or Emulator
3... Basic knowledge of Web Host panel and Php and SQL
-------------------PHP CODE--------------

<?php
$host="localhost"; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name=""; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form
$myusername=$_POST['username'];
$mypassword=$_POST['password'];

// To protect MySQL injection
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
echo "true";
}
else {
echo "Login Failed";
}
?>

---------------------------------------------
.............STEP 1...................

.............STEP 2...................

.............STEP 3...................

.............STEP 4...................

.............STEP 5...................


.............STEP 6...................


CODE

<?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" >
	

    <TextView
        android:id="@+id/TextView01"
        android:layout_width="110dp"
        android:layout_height="wrap_content"
        android:text="Username" />


    <EditText
        android:id="@+id/username"
        android:layout_width="255dp"
        android:layout_height="wrap_content" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="110dp"
        android:layout_height="wrap_content"
        android:text="Password" />


    <EditText
        android:id="@+id/Password"
        android:layout_width="259dp"
        android:layout_height="wrap_content"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/loginBtn"
        android:layout_width="123dp"
        android:layout_height="wrap_content"
        android:text="Login" />


    <TextView
        android:id="@+id/status"
        android:layout_width="140dp"
        android:layout_height="wrap_content"/>

</LinearLayout>

[mobile_fan_2k5]

.............STEP 7...................

.............STEP 8...................

---------------------

Then you'll insert this code

package com.techjamaica.php_Droid;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Php_DroidActivity extends Activity implements OnClickListener {
	
	Button ok,back,exit;
	 TextView result;
	 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        // Login button clicked
        ok = (Button)findViewById(R.id.loginBtn);
        ok.setOnClickListener(this);
         
        result = (TextView)findViewById(R.id.status);
    }
    
    //----------------Function to post login and communicate with mysql server----------
    public void postLoginData() {
    	// Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
         
        /* login.php returns true if username and password is equal to saranga */
        HttpPost httppost = new HttpPost("http://yourwebsite.com/test.php");
 
        try {
        	
            // Add user name and password
         EditText uname = (EditText)findViewById(R.id.username);
         String username = uname.getText().toString();
 
         EditText pword = (EditText)findViewById(R.id.Password);
         String password = pword.getText().toString();
          
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("username", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
 
            // Execute HTTP Post Request
            //---------------

            Log.w("Techjamaica", "Execute HTTP Post Request");
            HttpResponse response = httpclient.execute(httppost);
             
            String str = inputStreamToString(response.getEntity().getContent()).toString();
            Log.w("Techjamaica", str);
            
            //-----------------------

            
            if(str.toString().equalsIgnoreCase("true"))
            {
	            
             Log.w("Techjamaica", "TRUE");
             result.setText("Login successful");
             uname.setText("");
             pword.setText("");
             

            }else
            {
             Log.w("Techjamaica", "FALSE");
             //result.setText(str);
             
            }
            
 
        } catch (ClientProtocolException e) {
         e.printStackTrace();
        } catch (IOException e) {
         e.printStackTrace();
        }
        
    } //-----end of postdata()

    private StringBuilder inputStreamToString(InputStream is) {
        String line = "";
        StringBuilder total = new StringBuilder();
        // Wrap a BufferedReader around the InputStream
        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        // Read response until the end
        try {
         while ((line = rd.readLine()) != null) { 
           total.append(line); 
         }
        } catch (IOException e) {
         e.printStackTrace();
        }
        // Return full string
        return total;
       }
    
	public void onClick(View v) {
		// TODO Auto-generated method stub
		postLoginData();
	}
}

.............STEP 9...................
Based on user input it will give two message.. Successful or failed

or

[mobile_fan_2k5]

My version that I use....

So you can try it..

1... After successful login goes to another view.
2... UI Dialog to show that app is communicating with server

3... If failed error Dialog and ask to try again..



Additional References to Help out..
http://developer.android.com/guide/t...ml#AlertDialog
http://developer.android.com/referen.../Activity.html
----------------------------------------------------------------------------------------------------------------------------------

Download here

[Flexx17]

u going hard ova hear peeps keep up the good work if u guys need testers for anything just send me a pm or shout me on the num in ma sig...i wish i was more programming oriented to i could offer more than that

[mobile_fan_2k5]

will do have a health management application that I'm developing so I will keep you in mind...

[Flexx17]

will do have a health management application that I'm developing so I will keep you in mind...

yeah man kool......whats it about though maybe we can give some pointers