Near by App

https://drive.google.com/file/d/0B2ag35s4X53Eb2pSQVI1SzNudE0/view

Sensors

Sensors Overview
The Android platform supports three broad categories of sensors:
•Motion sensors
These sensors measure acceleration forces and rotational forces along three axes. This category includes accelerometers, gravity sensors, gyroscopes, and rotational vector sensors.
•Environmental sensors
These sensors measure various environmental parameters, such as ambient air temperature and pressure, illumination, and humidity. This category includes barometers, photometers, and thermometers.
•Position sensors
These sensors measure the physical position of a device. This category includes orientation sensors and magnetometers.
You can access sensors available on the device and acquire raw sensor data by using the Android sensor framework.
What can we do?
• Determine which sensors are available on a device.
• Determine an individual sensor's capabilities, such as its maximum range, manufacturer, power requirements, and resolution.
• Acquire raw sensor data and define the minimum rate at which you acquire sensor data.
• Register and unregister sensor event listeners that monitor sensor changes.
Some sensors are hardware based and some are software based. Hardware based are typically the physical components built into the handset. Software based sensors derive their information from one or more hardware based sensors and so they mimic the hardware based sensors and seem to be similar. So they are also called as virtual/synthetic sensors. 
Package? android.hardware package
// => to get Sensor Manager
SensorManager sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
// => To get List of all sensors
List<Sensor> lstSensors = sm.getSensorList(Sensor.TYPE_ALL);
// => To find a particular sensor
if (sm.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) != null){
  // Success! There's a magnetometer.
  }
else {
  // Failure! No magnetometer.
  }
// => To use a particular sensor, call public methods like:
s.getResolution(), s.getMaximumRange(), s.getPower()

Code

package net.samaysoftware.bletest;

import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.Date;
import java.util.List;

public class SensorActivity extends AppCompatActivity implements SensorEventListener {

    TextView tvSensorActivity;
    LinearLayout llsensor;
    SensorManager sm;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sensor);
        tvSensorActivity = (TextView) findViewById(R.id.tvsensor1);
        llsensor = (LinearLayout) findViewById(R.id.llSensor);
        sm = (SensorManager) getSystemService(this.SENSOR_SERVICE);
        Sensor s = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sm.registerListener(this,s,SensorManager.SENSOR_DELAY_NORMAL);
        llsensor.setBackgroundColor(Color.parseColor("#ffffff"));


    }

    long lasttime;

    @Override    public void onSensorChanged(SensorEvent sensorEvent) {
        float[] arr = sensorEvent.values;
        long currenttime = new Date().getTime();
        if(currenttime -  lasttime >200){

            float ans = (arr[0]*arr[0]+arr[1]*arr[1]+arr[2]*arr[2])/ (SensorManager.GRAVITY_EARTH*SensorManager.GRAVITY_EARTH);
            if(ans>3){

                llsensor.setBackgroundColor(Color.parseColor("#ff0000"));
            }
            else{

                llsensor.setBackgroundColor(Color.parseColor("#ffffff"));
            }

            lasttime = currenttime;
        }



    }

    @Override    public void onAccuracyChanged(Sensor sensor, int i) {

    }

    @Override    protected void onDestroy() {
        super.onDestroy();
        sm.unregisterListener(this);
    }
}



        /*List<Sensor> sensorList = sm.getSensorList(Sensor.TYPE_ALL);        for (Sensor s: sensorList             ) {            tvSensorActivity.append(s.getName()+"\n");        }*//*
          if(arr[0]==1){                  llsensor.setBackgroundColor(Color.parseColor("#ffffff"));                  }else{                  // object detected                  llsensor.setBackgroundColor(Color.parseColor("#ff0000"));                  }*/
/*//tvSensorActivity.setText("X="+arr[0]+"\n"+"Y="+arr[1]+"\n"+"Z="+arr[2]);        float y = arr[1];        if(y<2 && y>-2){            llsensor.setBackgroundColor(Color.parseColor("#ffffff"));        }        else if(y<4 && y>=2){            llsensor.setBackgroundColor(Color.parseColor("#ffaaaa"));        }        else if(y<6 && y>=4){            llsensor.setBackgroundColor(Color.parseColor("#ff7777"));        }        else if(y<8 && y>=6){            llsensor.setBackgroundColor(Color.parseColor("#ff4444"));        }        else if(y<10 && y>=8){            llsensor.setBackgroundColor(Color.parseColor("#ff0000"));        }        else if(y>-4 && y<=-2){            llsensor.setBackgroundColor(Color.parseColor("#aaffaa"));        }        else if(y>-6 && y<=-4){            llsensor.setBackgroundColor(Color.parseColor("#77ff77"));        }        else if(y>-8 && y<=-6){            llsensor.setBackgroundColor(Color.parseColor("#44ff44"));        }        else if(y>-10 && y<=-8){            llsensor.setBackgroundColor(Color.parseColor("#00ff00"));        }*/

GPS (Location Services) and Vibrator

This code shows GPSDemoActivity with GPS latitude,

longitude, geocoding into address,

sharing location as text, showing location on google maps

and vibration effect on button click.

Layout File: https://drive.google.com/file/d/1fFkpk2isKM9L5sxRI-6h6_BqrJrumEAQ/view?usp=sharing

Java File: https://drive.google.com/file/d/1NgrzgDehmvjCsIP7hRirbMV9PLN8Apf1/view?usp=sharing

Another Java File: https://drive.google.com/file/d/1ZCVdgb9JQSKrJ-BQ1Hjd9BF7rZUBUm8T/view?usp=sharing

Manifest: Please declare Access Fine Location, Access Coarse Location, Internet and Vibration permissions.

Images: 2 icon images are used in layout file which should be present in drawable folder.

Registration, Login and Category List with DOTNET MVC

Register Activity

package net.samaysoftware.listviewdemo;

import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import utility.HttpManager;
import utility.RequestPackage;

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {

    EditText etName, etMobile, etEmail, etUsername, etPassword, etAddress, etCity;
    Button btnRegister;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        findAllViews();

        btnRegister.setOnClickListener(this);


    }

    private void findAllViews() {
        etName = (EditText)findViewById(R.id.etCName);
        etEmail = (EditText)findViewById(R.id.etCEmail);
        etMobile = (EditText)findViewById(R.id.etCMobile);
        etUsername = (EditText)findViewById(R.id.etCUsername);
        etPassword = (EditText)findViewById(R.id.etCPassword);
        etAddress = (EditText)findViewById(R.id.etCAddress);
        etCity = (EditText)findViewById(R.id.etCCity);
        btnRegister = (Button) findViewById(R.id.btnRegister);
    }

    @Override    public void onClick(View view) {
        new MyTask().execute();
    }

    class MyTask extends AsyncTask<String, String, String>{
        String name, email, mobile, address, city, username, password;

        @Override        protected void onPreExecute() {
            super.onPreExecute();
            name = etName.getText().toString();
            email = etEmail.getText().toString();
            mobile = etMobile.getText().toString();
            address = etAddress.getText().toString();
            city = etCity.getText().toString();
            username = etUsername.getText().toString();
            password = etPassword.getText().toString();

        }



        @Override        protected String doInBackground(String... strings) {

            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.163:49962/MobileApp/SignUp");
            rp.setParam("Cname",name);
            rp.setParam("Email",email);
            rp.setParam("Mobile",mobile);
            rp.setParam("Username",username);
            rp.setParam("Password",password);
            rp.setParam("City",city);
            rp.setParam("Address",address);


            String ans = HttpManager.getData(rp);



            return ans.trim();
        }

        @Override        protected void onPostExecute(String s) {
            super.onPostExecute(s);

            if(s.equals("success")){
                Toast.makeText(RegisterActivity.this, "Registration is successful !!", Toast.LENGTH_LONG).show();
                Intent i = new Intent(RegisterActivity.this, LoginActivityDemo.class);
                startActivity(i);
                finish();

            }
            else{
                Toast.makeText(RegisterActivity.this, "There seems to be some problem, please try again later !!", Toast.LENGTH_LONG).show();
            }

        }
    }

}

LoginActivity

package net.samaysoftware.listviewdemo;

import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import utility.HttpManager;
import utility.RequestPackage;

public class LoginActivityDemo extends AppCompatActivity implements View.OnClickListener {
    String un, pw;
    EditText etUser, etPass;
    Button btnLogin;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_demo);
        etUser = (EditText) findViewById(R.id.etUser);
        etPass = (EditText) findViewById(R.id.etPass);
        btnLogin = (Button) findViewById(R.id.btnMyLogin);
        btnLogin.setOnClickListener(this);


      /*  SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(LoginActivityDemo.this);        int oldid = sp.getInt("id", -1000);        if(oldid!=-1000){            Intent i = new Intent(LoginActivityDemo.this, CategoryListActivity.class);            startActivity(i);            finish();        }*/
    }

    @Override    public void onClick(View view) {
        new LoginTask().execute();
    }

    class LoginTask extends AsyncTask<String, String, String>{
        ProgressDialog pd;
        String un, pw;

        @Override        protected void onPreExecute() {
            super.onPreExecute();
            un = etUser.getText().toString();
            pw = etPass.getText().toString();
            pd = new ProgressDialog(LoginActivityDemo.this);
            pd.setTitle("Please Wait");
            pd.setMessage("Loading");
            pd.setIndeterminate(true);
            pd.setCancelable(false);
            pd.show();
        }

        @Override        protected String doInBackground(String... arr) {
            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.163:49962/MobileApp/SignIn");

            rp.setParam("Username", un);
            rp.setParam("Password", pw);

            String ans = HttpManager.getData(rp);
            return ans.trim();
        }

        @Override        protected void onPostExecute(String ans) {
            super.onPostExecute(ans);

            if(pd!=null){
                pd.dismiss();
            }
/*            int id;            try {                id = Integer.parseInt(ans);            }catch (Exception ee){                Toast.makeText(LoginActivityDemo.this, "Cannot connect to server", Toast.LENGTH_LONG).show();                return;            }
            if(id==0){                Toast.makeText(LoginActivityDemo.this, "Invalid username or password !!", Toast.LENGTH_LONG).show();                return;            }
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(LoginActivityDemo.this);            sp.edit().putInt("id", id).apply();*/
            if(ans.equals("success")) {
                Intent i = new Intent(LoginActivityDemo.this, CategoryListActivity.class);
                startActivity(i);
                finish();
            }
            else{
                Toast.makeText(LoginActivityDemo.this, "Invalid username or password !!", Toast.LENGTH_LONG).show();

            }

        }


    }
}



CATEGORY LIST



package net.samaysoftware.listviewdemo;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import utility.HttpManager;
import utility.RequestPackage;

public class CategoryListActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    ListView listView;
    ArrayList<String> arrlist = new ArrayList<>();
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_country_list);
        listView = (ListView) findViewById(R.id.lvDynamicCountries);

        new MyTask().execute();


    }

    @Override    public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
        String catname = arrlist.get(pos);
        Intent i = new Intent(this, ProductListActivity.class);
        i.putExtra("catname", catname);
        startActivity(i);

/*        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);        builder1.setMessage("Are you sure you want to delete");        builder1.setCancelable(true);
        builder1.setPositiveButton(                "Yes",                new DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();                    }                });
        builder1.setNegativeButton(                "No",                new DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int id) {                        dialog.cancel();                    }                });
        AlertDialog alert11 = builder1.create();        alert11.show();*/
/*        AlertDialog.Builder builderSingle = new AlertDialog.Builder(this);        builderSingle.setIcon(R.drawable.flagindia);        builderSingle.setTitle("Select One Name:");
        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice);        arrayAdapter.add("Hardik");        arrayAdapter.add("Archit");        arrayAdapter.add("Jignesh");        arrayAdapter.add("Umang");        arrayAdapter.add("Gatti");
        builderSingle.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        });
        builderSingle.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                String strName = arrayAdapter.getItem(which);                AlertDialog.Builder builderInner = new AlertDialog.Builder(CategoryListActivity.this);                builderInner.setMessage(strName);                builderInner.setTitle("Your Selected Item is");                builderInner.setPositiveButton("Ok", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog,int which) {                        dialog.dismiss();                    }                });                builderInner.show();            }        });        builderSingle.show();
*/
    }

    class MyTask extends AsyncTask<String, String, String>{

        ProgressDialog pd = null;
        @Override        protected String doInBackground(String... strings) {
            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.163:49962/MobileApp/GetAllCategories");
            String ans = HttpManager.getData(rp);
            return ans.trim();
        }

        @Override        protected void onPreExecute() {
            super.onPreExecute();
            pd = new ProgressDialog(CategoryListActivity.this);
            pd.setIndeterminate(true);
            pd.setMessage("Loading....");
            pd.setCancelable(false);
            pd.setTitle("Please Wait");
            pd.show();
        }

        @Override        protected void onPostExecute(String ans) {
            super.onPostExecute(ans);

            //arr = ans.split(",");
            JSONArray arr = null;
            try {
                arr = new JSONArray(ans);
                for(int i = 0; i < arr.length(); i++){
                    JSONObject obj = arr.getJSONObject(i);
                    String catname = obj.getString("CatName");
                    arrlist.add(catname);
                }


            } catch (JSONException e) {
                e.printStackTrace();
            }


            ArrayAdapter<String> aa = new ArrayAdapter<>(CategoryListActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, arrlist);
            listView.setAdapter(aa);
            listView.setOnItemClickListener(CategoryListActivity.this);
            pd.dismiss();
        }
    }
}

Sqlite Database insert

package net.samaysoftware.listviewdemo;

import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.FileReader;
import java.io.Reader;

public class NewExpenseActivity extends AppCompatActivity implements View.OnClickListener {

    EditText etReason, etAmount;
    Button btnAddExpense;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_new_expense);

        setTitle("Add expense");
        createTable();

        etReason = (EditText) findViewById(R.id.etReason);
        etAmount = (EditText) findViewById(R.id.etAmount);
        btnAddExpense = (Button) findViewById(R.id.btnAddExpense);
        btnAddExpense.setOnClickListener(this);
    }

    private void createTable() {
        SQLiteDatabase db = null;
        try {
            db = openOrCreateDatabase("SampleDB", MODE_PRIVATE,null);
            String q = "create table if not exists Expense(expenseid integer primary key autoincrement,reason varchar(100), amount integer)";
            db.execSQL(q);
        }catch (Exception ee){
            Toast.makeText(this, "Some error while creating expense table", Toast.LENGTH_LONG).show();
        }
        finally {
            if(db!=null && db.isOpen()) {
                db.close();
            }
        }

    }

    @Override    public void onClick(View view) {

        String stramount = etAmount.getText().toString();
        String strreason = etReason.getText().toString();

        SQLiteDatabase db = null;
        try {
            db = openOrCreateDatabase("SampleDB", MODE_PRIVATE,null);
            String q = "insert into Expense(amount, reason) values("+stramount+",'"+strreason+"')";
            db.execSQL(q);
            Toast.makeText(this, "Expense added successfully !!", Toast.LENGTH_LONG).show();
            Intent i = new Intent(this, ExpenseListActivity.class);
            startActivity(i);
        }catch (Exception ee){
            Toast.makeText(this, "Some error while inserting in Expense table", Toast.LENGTH_LONG).show();
        }
        finally {
            if(db!=null && db.isOpen()) {
                db.close();
            }
        }



    }
}

Android Code with below PHP Code for Login, CategoryList, and ProductList Display with Alert Dialog code

LOGIN

package net.samaysoftware.listviewdemo;

import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import utility.HttpManager;
import utility.RequestPackage;

public class LoginActivityDemo extends AppCompatActivity implements View.OnClickListener {
    String un, pw;
    EditText etUser, etPass;
    Button btnLogin;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_demo);
        etUser = (EditText) findViewById(R.id.etUser);
        etPass = (EditText) findViewById(R.id.etPass);
        btnLogin = (Button) findViewById(R.id.btnMyLogin);
        btnLogin.setOnClickListener(this);


        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(LoginActivityDemo.this);
        int oldid = sp.getInt("id", -1000);
        if(oldid!=-1000){
            Intent i = new Intent(LoginActivityDemo.this, CategoryListActivity.class);
            startActivity(i);
            finish();
        }

    }

    @Override    public void onClick(View view) {
        new LoginTask().execute();
    }

    class LoginTask extends AsyncTask<String, String, String>{
        ProgressDialog pd;
        String un, pw;

        @Override        protected void onPreExecute() {
            super.onPreExecute();
            un = etUser.getText().toString();
            pw = etPass.getText().toString();
            pd = new ProgressDialog(LoginActivityDemo.this);
            pd.setTitle("Please Wait");
            pd.setMessage("Loading");
            pd.setIndeterminate(true);
            pd.setCancelable(false);
            pd.show();
        }

        @Override        protected String doInBackground(String... arr) {
            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.10:81/2018testing/mobilesupport.php");
            rp.setParam("type","login");
            rp.setParam("un", un);
            rp.setParam("pw", pw);

            String ans = HttpManager.getData(rp);
            return ans.trim();
        }

        @Override        protected void onPostExecute(String ans) {
            super.onPostExecute(ans);

            if(pd!=null){
                pd.dismiss();
            }
            int id;
            try {
                id = Integer.parseInt(ans);
            }catch (Exception ee){
                Toast.makeText(LoginActivityDemo.this, "Cannot connect to server", Toast.LENGTH_LONG).show();
                return;
            }

            if(id==0){
                Toast.makeText(LoginActivityDemo.this, "Invalid username or password !!", Toast.LENGTH_LONG).show();
                return;
            }

            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(LoginActivityDemo.this);
            sp.edit().putInt("id", id).apply();


            Intent i = new Intent(LoginActivityDemo.this, CategoryListActivity.class);
            startActivity(i);
            finish();

        }


    }
}

CATEGORY LIST

package net.samaysoftware.listviewdemo;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import utility.HttpManager;
import utility.RequestPackage;

public class CategoryListActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    ListView listView;
    String[] arr;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_country_list);
        listView = (ListView) findViewById(R.id.lvDynamicCountries);

        new MyTask().execute();


    }

    @Override    public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
        String catname = arr[pos];
        Intent i = new Intent(this, ProductListActivity.class);
        i.putExtra("catname", catname);
        startActivity(i);

/*        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);        builder1.setMessage("Are you sure you want to delete");        builder1.setCancelable(true);
        builder1.setPositiveButton(                "Yes",                new DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();                    }                });
        builder1.setNegativeButton(                "No",                new DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int id) {                        dialog.cancel();                    }                });
        AlertDialog alert11 = builder1.create();        alert11.show();*/
/*        AlertDialog.Builder builderSingle = new AlertDialog.Builder(this);        builderSingle.setIcon(R.drawable.flagindia);        builderSingle.setTitle("Select One Name:");
        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice);        arrayAdapter.add("Hardik");        arrayAdapter.add("Archit");        arrayAdapter.add("Jignesh");        arrayAdapter.add("Umang");        arrayAdapter.add("Gatti");
        builderSingle.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        });
        builderSingle.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                String strName = arrayAdapter.getItem(which);                AlertDialog.Builder builderInner = new AlertDialog.Builder(CategoryListActivity.this);                builderInner.setMessage(strName);                builderInner.setTitle("Your Selected Item is");                builderInner.setPositiveButton("Ok", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog,int which) {                        dialog.dismiss();                    }                });                builderInner.show();            }        });        builderSingle.show();
*/
    }

    class MyTask extends AsyncTask<String, String, String>{

        ProgressDialog pd = null;
        @Override        protected String doInBackground(String... strings) {
            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.10:81/2018testing/mobilesupport.php");
            rp.setParam("type","getcategorylist");
            String ans = HttpManager.getData(rp);
            return ans.trim();
        }

        @Override        protected void onPreExecute() {
            super.onPreExecute();
            pd = new ProgressDialog(CategoryListActivity.this);
            pd.setIndeterminate(true);
            pd.setMessage("Loading....");
            pd.setCancelable(false);
            pd.setTitle("Please Wait");
            pd.show();
        }

        @Override        protected void onPostExecute(String ans) {
            super.onPostExecute(ans);

            arr = ans.split(",");



            ArrayAdapter<String> aa = new ArrayAdapter<>(CategoryListActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, arr);
            listView.setAdapter(aa);
            listView.setOnItemClickListener(CategoryListActivity.this);
            pd.dismiss();
        }
    }
}


PRODUCT LIST


package net.samaysoftware.listviewdemo;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import utility.HttpManager;
import utility.RequestPackage;

public class ProductListActivity extends AppCompatActivity{
    ListView listView;
    String[] arr;
    String catname;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        catname = getIntent().getStringExtra("catname");

        setContentView(R.layout.activity_country_list);
        listView = (ListView) findViewById(R.id.lvDynamicCountries);

        new MyTask().execute();


    }


    class MyTask extends AsyncTask<String, String, String>{

        ProgressDialog pd = null;
        @Override
        protected String doInBackground(String... strings) {
            RequestPackage rp = new RequestPackage();
            rp.setMethod("GET");
            rp.setUri("http://192.168.31.10:81/2018testing/mobilesupport.php");
            rp.setParam("type","getproductlist");
            rp.setParam("catname",catname);

            String ans = HttpManager.getData(rp);
            return ans.trim();
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pd = new ProgressDialog(ProductListActivity.this);
            pd.setIndeterminate(true);
            pd.setMessage("Loading....");
            pd.setCancelable(false);
            pd.setTitle("Please Wait");
            pd.show();
        }

        @Override
        protected void onPostExecute(String ans) {
            super.onPostExecute(ans);

            arr = ans.split(",");



            ArrayAdapter<String> aa = new ArrayAdapter<String>(ProductListActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, arr);
            listView.setAdapter(aa);



            pd.dismiss();
        }
    }
}

PHP Code for MobileSupport.php

<?php
$type = $_REQUEST["type"];
if($type=="login"){
$username= $_REQUEST["un"];
$pw= $_REQUEST["pw"];

if($username=="v" && $pw=="v"){
echo "4";
}
else{
echo "0";
}
}
else if($type=="getcategorylist"){
echo "Clothes,Electronics,Food";
}
else if($type=="getproductlist"){
$catname = $_REQUEST["catname"];
if($catname == "Clothes"){
echo "Tshirt,Jeans,Shirt";
}
if($catname == "Electronics"){
echo "TV,Mobile,Laptop";
}
if($catname == "Food"){
echo "Burger,Pizza,Noodles";
}

}
else if($type=="getmyprofile"){

}
else if($type=="getproductdetails"){

}
?>