value <!DOCTYPE of type java.lang.string can not be converted to jsonobject

Question

I am a designer and have no idea about coding, I am reskining an app and after building apk I am having this error on signup screen when I enter all details and click on signup

value <!DOCTYPE of type java.lang.string can not be converted to jsonobject

Here is the complete code on my signupactivity.java file.

    import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;

import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

import com.amo.FillPocket.app.App;
import com.amo.FillPocket.common.ActivityBase;
import com.amo.FillPocket.util.CustomRequest;
import com.amo.FillPocket.util.Helper;

public class SignupActivity extends ActivityBase {


    EditText signupUsername, signupFullname, signupPassword, signupEmail;
    Button signupJoinBtn;

    private String username, fullname, password, email;

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        signupUsername = (EditText) findViewById(R.id.signupUsername);
        signupFullname = (EditText) findViewById(R.id.signupFullname);
        signupPassword = (EditText) findViewById(R.id.signupPassword);
        signupEmail = (EditText) findViewById(R.id.signupEmail);

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

        signupJoinBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                username = signupUsername.getText().toString();
                fullname = signupFullname.getText().toString();
                password = signupPassword.getText().toString();
                email = signupEmail.getText().toString();

                if (verifyRegForm()) {

                    if (App.getInstance().isConnected()) {

                        showpDialog();

                        CustomRequest jsonReq = new CustomRequest(Request.Method.POST, METHOD_ACCOUNT_SIGNUP, null,
                                new Response.Listener<JSONObject>() {
                                    @Override
                                    public void onResponse(JSONObject response) {

                                        Log.e("Profile", "Malformed JSON: \"" + response.toString() + "\"");

                                        if (App.getInstance().authorize(response)) {

                                            Intent i = new Intent(getApplicationContext(), MainActivity.class);
                                            startActivity(i);

                                            ActivityCompat.finishAffinity(SignupActivity.this);

                                        } else {

                                            switch (App.getInstance().getErrorCode()) {

                                                case 300 : {

                                                    signupUsername.setError(getString(R.string.error_login_taken));
                                                    break;
                                                }

                                                case 301 : {

                                                    signupEmail.setError(getString(R.string.error_email_taken));
                                                    break;
                                                }

                                                default: {

                                                    Log.e("Profile", "Could not parse malformed JSON: \"" + response.toString() + "\"");
                                                    break;
                                                }
                                            }
                                        }

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

                                Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
                                Log.e("Profile", "Malformed JSON: \"" + error.getMessage() + "\"");

                                hidepDialog();
                            }
                        }) {

                            @Override
                            protected Map<String, String> getParams() {
                                Map<String, String> params = new HashMap<String, String>();
                                params.put("username", username);
                                params.put("fullname", fullname);
                                params.put("password", password);
                                params.put("email", email);
                                params.put("clientId", CLIENT_ID);

                                return params;
                            }
                        };

                        App.getInstance().addToRequestQueue(jsonReq);

                    } else {

                        Toast.makeText(getApplicationContext(), R.string.msg_network_error, Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });

    }


    public Boolean verifyRegForm() {

        signupUsername.setError(null);
        signupFullname.setError(null);
        signupPassword.setError(null);
        signupEmail.setError(null);

        Helper helper = new Helper();

        if (username.length() == 0) {

            signupUsername.setError(getString(R.string.error_field_empty));

            return false;
        }

        if (username.length() < 5) {

            signupUsername.setError(getString(R.string.error_small_username));

            return false;
        }

        if (!helper.isValidLogin(username)) {

            signupUsername.setError(getString(R.string.error_wrong_format));

            return false;
        }

        if (fullname.length() == 0) {

            signupFullname.setError(getString(R.string.error_field_empty));

            return false;
        }

        if (password.length() == 0) {

            signupPassword.setError(getString(R.string.error_field_empty));

            return false;
        }

        if (password.length() < 6) {

            signupPassword.setError(getString(R.string.error_small_password));

            return false;
        }

        if (!helper.isValidPassword(password)) {

            signupPassword.setError(getString(R.string.error_wrong_format));

            return false;
        }

        if (email.length() == 0) {

            signupEmail.setError(getString(R.string.error_field_empty));

            return false;
        }

        if (!helper.isValidEmail(email)) {

            signupEmail.setError(getString(R.string.error_wrong_format));

            return false;
        }

        return true;
    }

    @Override
    public void onBackPressed(){

        finish();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        switch (item.getItemId()) {

            case android.R.id.home: {

                finish();
                return true;
            }

            default: {

                return super.onOptionsItemSelected(item);
            }
        }
    }
}

Answer 1

value <!DOCTYPE of type java.lang.string can not be converted to jsonobject

This does not seem to be fully your fault. Apparently API you are using is badly written and spits out pure HTML 404/500 error page in case when unhandled backend issue occur. This is unfortunately pretty common with half-baked or badly designed or untested software so if you do not have access to the source code to fix that but then there's no much you can do with this behavior. What is your fault however is lack of error handling in your code. You should always expect the worst which in this case means API timeout, lack of response, faulty response, incomplete response or malformed response and so on and be prepared. In case of your current code you need to try/catch response parsing code block and when exception occur handle it same way you would deal with other errors there.

Answer 2

简而言之，来自服务器的响应是错误的，服务器可能正在向您发送 HTML，通常在向服务器发送请求时服务器崩溃时发生。