public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
    public static final String LOGIN_URL = "https://example.com/login";

    public static final String KEY_USERNAME = "email";
    public static final String KEY_PASSWORD = "password";
    private EditText editTextUsername;
    private EditText editTextPassword;
    private Button buttonLogin;

    private String email;
    private String password;

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

        editTextUsername = (EditText) findViewById(R.id.editTextUsername);
        editTextPassword = (EditText) findViewById(R.id.editTextPassword);

        buttonLogin = (Button) findViewById(R.id.buttonLogin);

        buttonLogin.setOnClickListener(this);
    }

    private void userLogin() {
        email = editTextUsername.getText().toString().trim();
        password = editTextPassword.getText().toString().trim();
        StringRequest stringRequest = new StringRequest(Request.Method.POST, LOGIN_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        VolleyLog.v("Response:%n %s", response);
                       /* WebView webview = new WebView(LoginActivity.this);
                        setContentView(webview);
                        webview.loadData(response, "text/html; charset=utf-8", "utf-8");  */
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.e("Error: ", error.getMessage());
                        Toast.makeText(LoginActivity.this, error.toString(), Toast.LENGTH_LONG).show();
                    }
                }) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> map = new HashMap<String, String>();
                map.put(KEY_USERNAME, email);
                map.put(KEY_PASSWORD, password);
                return map;
            }
        };

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }

    private void openProfile() {
        Intent intent = new Intent(this, ActivityUserProfile.class);
        intent.putExtra(KEY_USERNAME, email);
        startActivity(intent);
    }

    @Override
    public void onClick(View v) {
        userLogin();
    }
}

05-12 17:41:00.750 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: hostname=xxxxx; servname=(null); cache_mode=(null), netid=0; mark=0
05-12 17:41:00.750 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=xxxxx; ai_flags=4; ai_family=0
05-12 17:41:00.751 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: hostname=xxxxx; servname=(null); cache_mode=(null), netid=0; mark=0
05-12 17:41:00.751 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=xxxxx; ai_flags=1024; ai_family=0
05-12 17:41:00.819 1081-8058/com.example.falcon.myapcontroller I/System.out: propertyValue:false
05-12 17:41:01.690 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: hostname=xxxxx; servname=(null); cache_mode=(null), netid=0; mark=0
05-12 17:41:01.690 1081-8058/com.example.falcon.myapcontroller D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=xxxxx; ai_flags=4; ai_family=0