import android.app.ProgressDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.HashMap;


public class ChangPass extends Fragment {
 public EditText PrevPass,NewPass;
    public Button Conform;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_chang_pass,container,false);
        PrevPass = (EditText) view.findViewById(R.id.prev_pass);
        NewPass = (EditText) view.findViewById(R.id.new_pass);
        Conform = (Button) view.findViewById(R.id.send);
        Conform.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               ChangePass();
                //getActivity().finish();

            }
        });
        return view;

    }
    private void ChangePass(){
        class Addmessage extends AsyncTask<Void,Void,String> {
            ProgressDialog loading;
            SharedPreferences sharedPreferences = getContext().getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
            String user = sharedPreferences.getString(Config.USERNAME_SHARED_PREF,"Not Available");
            String prevpass = PrevPass.getText().toString().trim();
            String newpass = NewPass.getText().toString().trim();
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                loading = ProgressDialog.show(getActivity(),"Sending Request..","..Please..Wait..",false,false);
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                loading.dismiss();
                Toast.makeText(getActivity(),s,Toast.LENGTH_SHORT).show();
            }

            @Override
            protected String doInBackground(Void... v) {

                HashMap<String,String> params = new HashMap<>();
                params.put(Config.KEY_PASS_USER,user);
                params.put(Config.KEY_PREV_PASS,prevpass);
                params.put(Config.KEY_NEW_PASS,newpass);
                ReuestHandler rh = new ReuestHandler();
                String res = rh.sendPostRequest(Config.URL_CHANG_PASS, params);
                return res;
            }
        }
        Addmessage ae = new Addmessage();
        ae.execute();
    }

}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.synergywebdesigners.veebee.ChangPass">
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
<TextView
    android:id="@+id/lbl_prev"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="@color/defaults"
    android:textStyle="bold"
    android:text="Your Current Password"/>
    <EditText
        android:id="@+id/prev_pass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:layout_below="@+id/lbl_prev"
        android:singleLine="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="New Password"
    android:textColor="@color/defaults"
    android:id="@+id/lbl_new"
    android:textStyle="bold"
    android:layout_below="@+id/prev_pass"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />
    <EditText
        android:id="@+id/new_pass"
        android:inputType="text"
        android:singleLine="true"
        android:layout_below="@+id/lbl_new"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
   <Button
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:id="@+id/send"
       android:padding="10dp"
       android:layout_below="@+id/new_pass"
       android:textColor="@color/defaults"
       android:background="@color/colorPrimary"
       android:text="Confirm Password Change"
       />
</RelativeLayout>