package com.cityzers.welcometohyderabad;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Created by DELL on 04-03-2018.
 */


public class TouristPlace extends Fragment implements AdapterView.OnItemClickListener {
    public ListView list;
    public ArrayAdapter<String> arrayAdapter;
    public ResultSet result;
    public Statement statement;
    public String Desc;
    public String output;
    public TouristPlace touristPlace;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tourists, container, false);
            list = (ListView)rootView.findViewById(R.id.places);
            touristPlace=new TouristPlace();
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/Welcome_to_hyd", "root", "test");
                statement = con.createStatement();
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
            final String[] placelist = getResources().getStringArray(R.array.menu);
            arrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, placelist);
            list.setAdapter(arrayAdapter);
            list.setOnItemClickListener(this);
            return rootView;
        }

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            switch(position) {
                case 0:
                    output=touristPlace.result("Golconda");
                    Intent i = new Intent(getActivity(), ListNavigation.class);
                    i.putExtra("DatabaseOutput", output);
                    startActivity(i);
            }
        }

        public String result(String city){
            String Fort = "Select Description from testHyd where TouristPlace="+city;
            try {
                result = statement.executeQuery(Fort);
                while (result.next()) {
                     Desc=result.getString(1);
                    System.out.println(Desc);
                }
            }catch (Exception e){
                e.printStackTrace();;
            }
            return Desc;
        }
    }

package com.cityzers.welcometohyderabad;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

/**
 * Created by DELL on 10-03-2018.
 */

public class ListNavigation extends Activity {

    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.placesoutput);
        TextView tv=findViewById(R.id.hydtext1);
        tv.setText(getIntent().getStringExtra("DatabaseOutput"));
    }
}

Process: com.cityzers.welcometohyderabad, PID: 2973
                                             java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cityzers.welcometohyderabad/com.cityzers.welcometohyderabad.ListNavigation}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                                                 at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                 at android.os.Looper.loop(Looper.java:154)
                                                 at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
                                              Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
                                                 at com.cityzers.welcometohyderabad.ListNavigation.onCreate(ListNavigation.java:23)
                                                 at android.app.Activity.performCreate(Activity.java:6679)
                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                                                 at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                 at android.os.Looper.loop(Looper.java:154)
                                                 at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)