import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
    public Button button;
    //this is the JSON Data URL
    //make sure you are using the correct ip else it will not work
    public static final String URL_COURSE = "http://192.168.43.73/enroll4free/json.php";
    //a list to store all the courses
    List<Course> courseList;
    //the recyclerview
    RecyclerView recyclerView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //getting the recyclerview from xml
        recyclerView = findViewById(R.id.recycler_View);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        //initializing the courselist
        courseList = new ArrayList<>();
        //this method will fetch and parse json
        //to display it in recyclerview
        loadCourses();
    }
    private void loadCourses() {
       /*
       * Creating a String Request
       * The request type is GET defined by first parameter
       * The URL is defined in the second parameter
       * Then we have a Response Listener and a Error Listener
       * In response listener we will get the JSON response as a String
       * */
        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_COURSE,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            //converting the string to json array object
                            JSONArray array = new JSONArray(response);
                            //traversing through all the object
                            for (int i = 0; i < array.length(); i++) {
                                //getting course object from json array
                                JSONObject course = array.getJSONObject(i);
                                //adding the course to course list
                                courseList.add(new Course(
                                        course.getInt("id"),
                                        course.getString("coursename"),
                                        course.getString("coursedescshort"),
                                        course.getString("courseurl"),
                                        course.getString("courserating"),
                                        course.getString("courseimg")
                                ));
                            }
                            //creating adapter object and setting it to recyclerview
                            CourseAdapter adapter = new CourseAdapter(MainActivity.this, courseList);
                            recyclerView.setAdapter(adapter);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                    }
                });
        //adding our stringrequest to queue
        Volley.newRequestQueue(this).add(stringRequest);
    }
}

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import org.w3c.dom.Text;
import java.util.List;
/**
 * Created by ninja on 13/1/18.
 */
public class CourseAdapter extends RecyclerView.Adapter<CourseAdapter.CourseViewHolder> {
    public static final String KEY_COURSE_ID = "courseid";
    public static Button button;
    private Context mCtx;
    private List<Course> courseList;
    private static final String KEY_courseurl = "courseurl";
    public CourseAdapter(Context mCtx, List<Course> courseList) {
        this.mCtx = mCtx;
        this.courseList = courseList;
    }

    @Override
    public CourseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mCtx);
        View view = inflater.inflate(R.layout.list_layout, null);
        return new CourseViewHolder(view);
    }

    @Override
    public void onBindViewHolder(CourseViewHolder holder, int position) {
        final Course course = courseList.get(position);
        holder.textViewCoursename.setText(course.getCoursename());
        holder.textViewcoursedescshort.setText(course.getCoursedescshort());
//holder.textViewcourseurl.setText(course.getCourseurl());
        holder.textViewcourserating.setText(course.getCourserating());
        Glide.with(mCtx)
                .load(course.getCourseimg())
                .into(holder.imageView);

        // Defining Button Action
            holder.button.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {

                Intent intent = new Intent(mCtx, CourseDetailActivity.class);
                intent.putExtra(KEY_COURSE_ID, course.getId());

                mCtx.startActivity(intent);

                //Intent i = new Intent(Intent.ACTION_VIEW);
                //i.setData(Uri.parse(course.getCourseurl()));
                //mCtx.startActivity(i);
            }
        });
    }
    @Override
    public int getItemCount() {
        return courseList.size();
    }
    class CourseViewHolder extends RecyclerView.ViewHolder{
        ImageView imageView;
        TextView textViewCoursename, textViewcoursedescshort, textViewcourseurl, textViewcourserating;
        Button button;
        public CourseViewHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageView);
            textViewCoursename = itemView.findViewById(R.id.textViewcoursename);
            textViewcoursedescshort = itemView.findViewById(R.id.textViewcoursedescshort);
            textViewcourseurl = itemView.findViewById(R.id.textViewcourseurl);
            textViewcourserating = itemView.findViewById(R.id.textViewcourserating);
            button = (Button) itemView.findViewById(R.id.btnreadmore);
        }
    }
}

/**
 * Created by ninja on 13/1/18.
 */
public class Course {
    private int id;
    private String coursename, coursedescshort, courseurl;
    private String courserating;
    private String courseimg;
    public Course(int id, String coursename, String coursedescshort, String courseurl, String courserating, String courseimg) {
        this.id = id;
        this.coursename = coursename;
        this.coursedescshort = coursedescshort;
        this.courseurl = courseurl;
        this.courserating = courserating;
        this.courseimg = courseimg;
    }
    public int getId() {
        return id;
    }
    public String getCoursename() {
        return coursename;
    }
    public String getCoursedescshort() {
        return coursedescshort;
    }
    public String getCourseurl() {
        return courseurl;
    }
    public String getCourserating() {
        return courserating;
    }
    public String getCourseimg() {
        return courseimg;
    }
}

import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;

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

public class CourseDetailActivity extends AppCompatActivity {

    ImageView imageView;
    TextView textViewcoursename, textViewcoursedescshort, textViewcourseurl, textViewcourserating;
    Button button;
    Uri uri;
    String stringUri;


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

        imageView = (ImageView) findViewById(R.id.imageView);
        textViewcoursename = (TextView) findViewById(R.id.textViewcoursename);
        textViewcoursedescshort = (TextView) findViewById(R.id.textViewcoursedescshort);
        textViewcourserating = (TextView) findViewById(R.id.textViewcourserating);


        Intent intent = getIntent();

        if(intent == null)
            return;

        int id = intent.getIntExtra(CourseAdapter.KEY_COURSE_ID, -1);

        loadCourses(id);
    }

    private void loadCourses(int id) {
        StringRequest stringRequest = new StringRequest(Request.Method.GET, MainActivity.URL_COURSE + "/"+id,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        try {
                            JSONObject obj = new JSONObject(response);

                            Glide.with(getApplicationContext()).load(obj.getString("courseimg")).into(imageView);

                            textViewcoursename.setText(obj.getString("coursename"));
                            textViewcoursedescshort.setText(obj.getString("coursedescshort"));
                            textViewcourserating.setText(obj.getString("courserating"));

                           button.setOnClickListener(new Button.OnClickListener() {
                               public void onClick(View v) {
                                   Intent i = new Intent(Intent.ACTION_VIEW);

                                   stringUri = uri.toString();
                                   i.setData(Uri.parse("courseurl"));
                                   startActivity(i);

                                   //Intent i = new Intent(Intent.ACTION_VIEW);
                                   //i.setData(Uri.parse(course.getCourseurl()));
                                   //mCtx.startActivity(i);
                               }
                           });

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                    }
                });
        //adding our stringrequest to queue
        Volley.newRequestQueue(this).add(stringRequest);
    }
}