java

package com.example.project.bulog;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.media.Image;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.text.method.PasswordTransformationMethod;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;

import com.example.project.bulog.controller.UserController;
import com.example.project.bulog.model.ErrorBaseModel;
import com.example.project.bulog.model.User;
import com.example.project.bulog.utils.ProgressDialogUtil;
import com.example.project.bulog.utils.SessionManager;

import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;


public class LoginActivity extends Activity {


    EditText password, username;
    Button btnMasuk;
    SessionManager session;
    ImageButton ibtnShow, ibtnHide;
    FrameLayout ibtnClear;
    TextView lupaPassword, daftarBaru;


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


        session = new SessionManager(getApplicationContext());

        if(session.isLoggedIn()){
            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
            startActivity(intent);
            finish();
        }

        password = (EditText)findViewById(R.id.input_password);
        username = (EditText)findViewById(R.id.input_nama);
        ibtnClear = (FrameLayout)findViewById(R.id.clear);
        ibtnHide = (ImageButton)findViewById(R.id.hide);
        ibtnShow = (ImageButton)findViewById(R.id.show);
        lupaPassword = (TextView)findViewById(R.id.lupaPassword);
        daftarBaru = (TextView)findViewById(R.id.daftarBaru);

        //Deteksi Inputan user di field username
        username.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

                // you can call or do what you want with your EditText here
                //kalau nilai dari inputan username tidak ada maka button cleat akan menghilang
                if (username.getText().toString().length() == 0) {
                    ibtnClear.setVisibility(View.INVISIBLE);
                } else {
                    username.setError(null);
                }

            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            public void onTextChanged(CharSequence s, int start, int before, int count) {
                ibtnClear.setVisibility(View.VISIBLE);
            }
        });

        //Deteksi Inputan user di field password
        password.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

                // you can call or do what you want with your EditText here
                if (password.getText().toString().length() == 0) {

                    //membuat button show dan buttin hide tidak terlihat
                    ibtnShow.setVisibility(View.INVISIBLE);
                    ibtnHide.setVisibility(View.INVISIBLE);
                }else if(ibtnHide.getVisibility()==View.VISIBLE){
                    ibtnShow.setVisibility(View.INVISIBLE);
                }else{
                    ibtnShow.setVisibility(View.VISIBLE);
                }

            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }
        });

        //deteksi klik dari button clear
        ibtnClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //clear username
                username.setText("");
            }
        });


        //deteksi button daftar baru
        daftarBaru.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(LoginActivity.this, "Daftar baru!", Toast.LENGTH_SHORT).show();
            }
        });

        //deteksi button lupa password
        lupaPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(LoginActivity.this, "Lupa Password!", Toast.LENGTH_SHORT).show();
            }

            });

        //deteksi klik dari button show
        ibtnShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                //buat field password jadi terlihat
                password.setTransformationMethod(null);

                //menampilkan button hide dan menyembunyikan button show
                ibtnShow.setVisibility(View.INVISIBLE);
                ibtnHide.setVisibility(View.VISIBLE);
            }
        });

        //deteksi button hide
        ibtnHide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(LoginActivity.this, "Clicked 2", Toast.LENGTH_SHORT).show();

                //untuk hide passwordnya
                password.setTransformationMethod(new PasswordTransformationMethod());

                //menampilkan button show dan menyembunyikan button hide
                ibtnShow.setVisibility(View.VISIBLE);
                ibtnHide.setVisibility(View.INVISIBLE);
            }
        });




        Toast.makeText(getApplicationContext(), "User Login Status: " + session.isLoggedIn(), Toast.LENGTH_LONG).show();



        btnMasuk = (Button)findViewById(R.id.btnMasuk);
        btnMasuk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                password = (EditText)findViewById(R.id.input_password);
                username = (EditText)findViewById(R.id.input_nama);
                String passwordValue = password.getText().toString();
                String usernameValue = username.getText().toString();

                //Untuk handler
                if(!passwordValue.equals("") && !usernameValue.equals("")){
                    new DoLogin().execute();
                }else if(passwordValue.equals("") && usernameValue.equals("")){
                    password.setError("Harus diisi!");
                    username.setError("Harus diisi!");
                }else if(passwordValue.equals("")){
                    password.setError("Harus diisi");
                }else if(usernameValue.equals("")){
                    username.setError("Harus diisi");
                }else{
                    Toast.makeText(LoginActivity.this, "Isi data dengan benar!", Toast.LENGTH_SHORT).show();
                }



            }
        });
    }


    //enkripsi data
    public String md5(String s) {
        try {
            // Create MD5 Hash
            MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
            digest.update(s.getBytes());
            byte messageDigest[] = digest.digest();

            // Create Hex String
            StringBuffer hexString = new StringBuffer();
            for (int i=0; i<messageDigest.length; i++)
                hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
            return hexString.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }

    private class DoLogin extends AsyncTask<String, String,User> {
        private User user;
        private ErrorBaseModel errorBaseModel = new ErrorBaseModel();
        private ProgressDialogUtil pDialog;
        @Override
        protected User doInBackground(String... strings) {
            UserController controller = new UserController(LoginActivity.this);
            try{
                String valuePassword = md5(password.getText().toString());
                String valueUsername = username.getText().toString();

                Map<String, Object> param = new HashMap<>();
                param.put("username",valueUsername);
                param.put("password",valuePassword);
                user = controller.doLogin(param);
                return user;
            }catch (UnknownHostException ex){
                errorBaseModel.setStatus("No internet connection!");
                Log.e("err", ex.getMessage());
            }catch (Exception ex){
                errorBaseModel.setStatus(ex.getMessage());
                Log.e("err", ex.getMessage());
            }
            return null;
        }

        @Override
        protected void onPostExecute(User user) {
            super.onPostExecute(user);
            if(user==null){
                Toast.makeText(LoginActivity.this,errorBaseModel.getStatus(),Toast.LENGTH_LONG).show();
            }else if(user.getStatus().equals("failed")){
                Toast.makeText(LoginActivity.this,"Invalid login!",Toast.LENGTH_LONG).show();
            }else{
                session.createLoginSession(user.getUsername(),user.getUsername());
                Toast.makeText(LoginActivity.this,"Welcome, "+user.getUsername(),Toast.LENGTH_LONG).show();
                Intent intent = new Intent (getApplicationContext(), MainActivity.class);
                startActivity(intent);
                finish();
            }
            pDialog.dismiss();
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialogUtil(LoginActivity.this, ProgressDialog.STYLE_SPINNER);
            pDialog.show();
        }

    }
}