code1

public class LoginLogoutActivity extends AppCompatActivity {




    private ProgressBar pb;
    private Button lognbtn;
    private Button btn;
    private EditText username;
    private EditText password;


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

        pb = (ProgressBar) findViewById(R.id.progressbar);

        WebView view = (WebView) findViewById(R.id.myWebView);
        view.loadUrl("file:///android_asset/loading.html");

        username = (EditText) findViewById(R.id.textView);
        password = (EditText) findViewById(R.id.textView1);
        lognbtn= (Button) findViewById(R.id.loginButton);
        btn = (Button) findViewById(R.id.button);


        Button signUpButton  = (Button) findViewById(R.id.button);
        signUpButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(LoginLogoutActivity.this,SignupActivity.class);
                startActivity(intent);
            }
        });
        Button loginButton = (Button) findViewById(R.id.loginButton);
        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                final String usernameTxt = username.getText().toString();
                final String passwordTxt = password.getText().toString();


                //pb.setVisibility(View.VISIBLE);

                if((usernameTxt == null || usernameTxt.isEmpty()) ||(passwordTxt == null || passwordTxt.isEmpty()) ){
                    //display message for user

                    Log.v("#status","Empty");

                    View parentLayout = findViewById(android.R.id.content);
                    Snackbar sb = Snackbar.make(parentLayout, "Missing fields" , Snackbar.LENGTH_LONG)
                            .setActionTextColor(getResources().getColor(android.R.color.white ));
                    View sbView = sb.getView();
                    sbView.setBackgroundColor(ContextCompat.getColor(LoginLogoutActivity.this,R.color.Pink));
                    sb.show();

                }else {
                    //condition that both username and password feild is not empty
                    pb.setVisibility(View.VISIBLE); //show loading progress

                    RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
                    StringRequest request = new StringRequest(Request.Method.POST, "http://loupe.kulchan.com/api/login", new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {
                            Log.v("#status", response);

                            pb.setVisibility(View.GONE); //hide progress

                            Intent intent = new Intent(LoginLogoutActivity.this, HomeActivity.class);
                            startActivity(intent);
                            finish();


                        }
                    }, new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {

                            pb.setVisibility(View.GONE);

                            if (null != error.getMessage()
                                    ) {
                                Log.v("#status", error.getMessage());
                                try {
                                    JSONObject obj = new JSONObject(error.getMessage().toString());

                                    View parentLayout = findViewById(android.R.id.content);
                                    Snackbar sb = Snackbar.make(parentLayout, obj.getString("error"), Snackbar.LENGTH_LONG)

                                            .setActionTextColor(getResources().getColor(android.R.color.white ));
                                    View sbView = sb.getView();
                                    sbView.setBackgroundColor(ContextCompat.getColor(LoginLogoutActivity.this,R.color.Pink));
                                    sb.show();
//                                Toast.makeText(LoginLogoutActivity.this, obj.getString("error"), Toast.LENGTH_LONG).show();

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

                        protected Map<String, String> getParams() {
                            Map<String, String> params = new HashMap<String, String>();
                            params.put("username", usernameTxt);
                            params.put("password", passwordTxt);

                            Log.v("#status", params.toString());
                            return params;


                        }

                        @Override
                        protected VolleyError parseNetworkError(VolleyError volleyError) {
                            String json;
                            if (volleyError.networkResponse != null && volleyError.networkResponse.data != null) {
                                try {
                                    json = new String(volleyError.networkResponse.data,
                                            HttpHeaderParser.parseCharset(volleyError.networkResponse.headers));
                                } catch (UnsupportedEncodingException e) {
                                    return new VolleyError(e.getMessage());
                                }
                                return new VolleyError(json);
                            }
                            return volleyError;
                        }

                    };


                    requestQueue.add(request);
                    requestQueue.start();
                }




            }

            ;


//                pb.setVisibility(View.GONE);

        });



    }}