I am developing Login on android via connection with php (web).
Code
package com.example.salmakhalil.myapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class LoginActivity extends AppCompatActivity {
private EditText email,password;
private Button btn_login;
private TextView link_regist;
private ProgressBar loading;
private static String URL_LOGIN="http://192.168.8.101/android_register_login/login.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
loading=findViewById(R.id.loading);
email=findViewById(R.id.email);
password=findViewById(R.id.password);
btn_login=findViewById(R.id.btn_login);
link_regist=findViewById(R.id.link_regist);
btn_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String mEmail=email.getText().toString().trim();
String mPass=password.getText().toString().trim();
if (!mEmail.isEmpty() || !mPass.isEmpty()){
Login(mEmail,mPass);
}
else {
email.setError("Please insert email");
password.setError("Please insert Password");
}
}
});
link_regist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}
});
}
private void Login(String email, String password){
loading.setVisibility(View.VISIBLE);
btn_login.setVisibility(View.GONE);
//I think here facing a problem
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
When I click on the login Button, its showing thee error
org.json.JSONException: No value for success.
I'm all the day trying to fix it. I have read other posts on Stack, no one helped me. I hope you can help me. Thanks.
Apparently the jsonObject
your receive in onResponse()
does not have a value for entry "success"
You should use the method jsonObject.optString("success");
instead of jsonObject.getString("success");
optString("success")
returns the empty string ("") if the key "success" doesn't exist. getString("success")
on the other hand throws a JSONException.
Can you share the response that is supposed to get. I think the response doesn't contain any field name "success". Query on postman to get response otherwise talk to your back end developer.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.