Programming Android: 2012

This is actually divided into two the Android part and the Php Part.
Note: Do not forget to include the INTERNET permission in the AndroidManifest.xml file

The Android Part

main.xml
<?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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <LinearLayout
    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_margin="20dp">
    <EditText
    android:id="@+id/editFirstname"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="10dp" >
    <requestFocus />
    </EditText>
    <EditText
    android:id="@+id/editLastname"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="10dp" />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
    </LinearLayout>
</LinearLayout>

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.akinware.gtugbase"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".GtugBase" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Gtugbase.java
package com.akinware.gtugbase;

import java.util.ArrayList;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class GtugBase extends Activity {
    /** Called when the activity is first created. */
    Button btnAdd;
    EditText txtFirstname,txtLastname;
    String status,error;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnAdd = (Button)findViewById(R.id.button1);
        txtFirstname = (EditText)findViewById(R.id.editFirstname);
        txtLastname = (EditText)findViewById(R.id.editLastname);


        /* ** Onclick of the add button ** */
        btnAdd.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                /* Collect values from EditText */
                String firstName = txtFirstname.getText().toString();
                String lastName = txtFirstname.getText().toString();
                /* Send Values to Method */
                SendToPhpFile(firstName,lastName);
            }
        });



    }

    protected void SendToPhpFile(String firstName, String lastName) {
        ArrayList<NameValuePair> pp = new ArrayList<NameValuePair>();

        /* In case you are having many php functions, this helps you
        to select the function you want to send parameters to.
        For example here i will be sending values to the "add" function */

        pp.add(new BasicNameValuePair("whichfunction", "AddUser"));



        /* Add values to arraylist */
        pp.add(new BasicNameValuePair("firstname", firstName));
        pp.add(new BasicNameValuePair("lastname", lastName));


        /* With the help of the HttpClient Class we send all parameter
         to the php script. check ConnectBase.java for the location   */
                try{
            status = "";
            status = CustomHttpClient.executeHttpPost(ConnectBase.link, pp);
            String res=status.toString();
            res= res.replaceAll("\\s+","");

            /* Depending on value you return if insert was successful */
                if(res.equals("1")){
                    Toaster("Data successfully added.");
                }else{
                    Toaster(status);
                }
            }catch(Exception e){
                Toaster("Data successfully added: " + e.toString());
            }

    }
    public void Toaster(String string){
        Toast.makeText(this, string,Toast.LENGTH_LONG).show();

    }

}

ConnectBase.java
package com.akinware.gtugbase;
/* The location of your php file */
public class ConnectBase {
    public static String link = "http://10.0.2.2/gtugbase/gtug.php";

}

CustomHttpClient.java
package com.akinware.gtugbase;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

public class CustomHttpClient {
    /** The time it takes for our client to timeout */
    public static final int HTTP_TIMEOUT = 2000 * 1000; // milliseconds

    /** Single instance of our HttpClient */
    private static HttpClient mHttpClient;

    /**
     * Get our single instance of our HttpClient object.
     *
     * @return an HttpClient object with connection parameters set
     */
    private static HttpClient getHttpClient() {
        if (mHttpClient == null) {
            mHttpClient = new DefaultHttpClient();
            final HttpParams params = mHttpClient.getParams();
            HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
            HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
            ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
        }
        return mHttpClient;
    }

    /**
     * Performs an HTTP Post request to the specified url with the
     * specified parameters.
     *
     * @param url The web address to post the request to
     * @param postParameters The parameters to send via the request
     * @return The result of the request
     * @throws Exception
     */
    public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception {
        BufferedReader in = null;
        try {
            HttpClient client = getHttpClient();
            HttpPost request = new HttpPost(url);
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
            request.setEntity(formEntity);
            HttpResponse response = client.execute(request);
            in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

            StringBuffer sb = new StringBuffer("");
            String line = "";
            String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
            }
            in.close();

            String result = sb.toString();
            return result;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * Performs an HTTP GET request to the specified url.
     *
     * @param url The web address to post the request to
     * @return The result of the request
     * @throws Exception
     */
    public static String executeHttpGet(String url) throws Exception {
        BufferedReader in = null;
        try {
            HttpClient client = getHttpClient();
            HttpGet request = new HttpGet();
            request.setURI(new URI(url));
            HttpResponse response = client.execute(request);
            in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

            StringBuffer sb = new StringBuffer("");
            String line = "";
            String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
            }
            in.close();

            String result = sb.toString();
            return result;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

The Php Part

<?php
    /* Database connection */
    mysql_connect("localhost","root","");
    mysql_select_db("gtbase");

    /* Get the value in the whichfunction parameter
         sent from the android application which will
         determine the fucntion to call.   */

    $getFunctionToCall = $_POST['whichfunction'];


    /* Depending on the value of the whichfunction
    parameter switch to call different function */

        switch ($getFunctionToCall){
    case "AddUser":
    echo AddUser($_POST['firstname'],$_POST['lastname']);
    break;
    }

    /* Function to add user to the user table */

    function AddUser($firstname,$lastname){
    $sql = "insert into user(firstname,lastname) values('$firstname','$lastname')";
    if(mysql_query($sql)){
    return 1; // Return 1 for success;
    }else{
    return 2;// Return 2 for database error;
    }
    }
?>

Database Structure
CREATE TABLE `user` (
`id` bigint(20) NOT NULL auto_increment,
`firstname` varchar(225) NOT NULL,
`lastname` varchar(225) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Programming Android

Tuesday 24 April 2012

Android add data to remote database (MySql)

Thursday 23 February 2012