如何在android项目中验证登录？

Question

我在 Android 中开发了一种登录表单。我必须在我的登录类中实现验证部分。这是我的登录类。我正在使用 api 连接数据库。请帮我这个。

公共类 LoginActivity 扩展 AppCompatActivity {

private static final int REQUEST_READ_CONTACTS = 0;
SoapPrimitive resultString;
String Response;
String url = "url";

private EditText usernamee;
private EditText passwordd;
private View mLoginFormView;
String username = "";
String password = "";
String response = "";
private String count = "";

JSONArray LocArray = new JSONArray();

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

    final Context context = getApplicationContext();
    // Set up the login form.
    usernamee = (EditText) findViewById(R.id.usernamee);
    passwordd = (EditText) findViewById(R.id.passwordd);

    Button mEmailSignInButton = (Button) findViewById(R.id.btnLogin);

    mEmailSignInButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            username = usernamee.getText().toString();
            password = passwordd.getText().toString();

            RequestQueue queue = Volley.newRequestQueue(context);

            StringRequest postRequest = new StringRequest(Request.Method.POST, url,
                    new Response.Listener<String>()
                    {
                        @Override
                        public void onResponse(String response) {
                            // response
                            Log.d("Response", response);

                            try {
                                JSONObject obj = new JSONObject(response);
                                if(obj.get("Role").equals("Admin"))
                                {
                                    Intent adminIntent = new Intent(LoginActivity.this, Main2Activity.class);
                                    startActivity(adminIntent);
                                }
                                else if (obj.get("Role").equals("User"))
                                {
                                    Intent userIntent = new Intent(LoginActivity.this, Main3Activity.class);
                                    startActivity(userIntent);
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    },
                    new Response.ErrorListener()
                    {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            // error
                            Log.d("Error.Response", response);
                        }
                    }
            ) {
                @Override
                protected Map<String, String> getParams()
                {
                    Map<String, String> params = new HashMap<String, String>();
                    params.put("username", username);
                    params.put("password", password);

                    return params;
                    //return null;
                }
            };
            queue.add(postRequest);

        }
    });


}

// @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)

}

如何在我的登录类中实现验证。

Answer 1

尝试这个

      private EditText input_email,input_password;

    public boolean validate() {
                boolean valid = true;

                String email = input_email.getText().toString();
                String password = input_password.getText().toString();

                if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
                    input_email.setError("enter a valid email address");
                    valid = false;
                } else {
                    input_email.setError(null);
                }

                if (password.isEmpty() || password.length() < 4 || password.length() > 10) {
                    input_password.setError("between 4 and 10 alphanumeric characters");
                    valid = false;
                } else {
                    input_password.setError(null);
                }

                return valid;
            }