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This below code is of my Signupscreen.java. I am trying to connect my android application to mysql database locally. I am using this http://ift.tt/1L4oBYU turorial. So when i click the register button after entering all the details in registration form the application got crashed and give the following error in logcat:
AndroidRuntime FATAL EXCEPTION: main
Android Runtime Process: com.example.vts, PID: 2312
Android Runtime java.lang.NullPointerException at com.example.vts.Signupscreen.registerUser(Signupscreen.java:195)
public class Signupscreen extends Activity {
private static final String TAG = Signupscreen.class.getSimpleName();
private Button btnRegister;
private Button btnLinkToLogin;
private EditText inputFullName;
private EditText inputEmail;
private EditText inputPassword;
private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signupscreen);
inputFullName = (EditText) findViewById(R.id.name);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
btnRegister = (Button) findViewById(R.id.btnsignup);
btnLinkToLogin = (Button) findViewById(R.id.linktologin);
// Progress dialog
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// Session manager
session = new SessionManager(getApplicationContext());
// SQLite database handler
db = new SQLiteHandler(getApplicationContext());
// Check if user is already logged in or not
if (session.isLoggedIn()) {
// User is already logged in. Take him to main activity
Intent intent = new Intent(Signupscreen.this,
MainActivity.class);
startActivity(intent);
finish();
}
// Register Button Click event
btnRegister.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String name = inputFullName.getText().toString().trim();
String email = inputEmail.getText().toString().trim();
String password = inputPassword.getText().toString().trim();
if (!name.isEmpty() && !email.isEmpty() && !password.isEmpty()) {
registerUser(name, email, password);
} else {
Toast.makeText(getApplicationContext(),
"Please enter your details!", Toast.LENGTH_LONG)
.show();
}
}
});
// Link to Login Screen
btnLinkToLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
LoginActivity.class);
startActivity(i);
finish();
}
});
}
private void registerUser(final String name, final String email,
final String password) {
// Tag used to cancel the request
String tag_string_req = "req_register";
pDialog.setMessage("Registering ...");
showDialog();
StringRequest strReq = new StringRequest(Method.POST,
AppConfig.URL_REGISTER, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Register Response: " + response.toString());
hideDialog();
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
if (!error) {
// User successfully stored in MySQL
// Now store the user in sqlite
String uid = jObj.getString("uid");
JSONObject user = jObj.getJSONObject("user");
String name = user.getString("name");
String email = user.getString("email");
String created_at = user
.getString("created_at");
// Inserting row in users table
db.addUser(name, email, uid, created_at);
Toast.makeText(getApplicationContext(), "User successfully registered. Try login now!", Toast.LENGTH_LONG).show();
// Launch login activity
Intent intent = new Intent(
Signupscreen.this,
LoginActivity.class);
startActivity(intent);
finish();
} else {
// Error occurred in registration. Get the error
// message
String errorMsg = jObj.getString("error_msg");
Toast.makeText(getApplicationContext(),
errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Registration Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_LONG).show();
hideDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting params to register url
Map<String, String> params = new HashMap<String, String>();
params.put("name", name);
params.put("email", email);
params.put("password", password);
return params;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
private void showDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hideDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
I am new to android so this may be a silly error or mistake.
singupscreen.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://ift.tt/nIICcg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/signupscreen"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="120dp"
android:layout_marginTop="30dp"
android:text="SIGN UP"
android:textColor="#FFFFFF"
android:textSize="24sp" />
<EditText
android:id="@+id/name"
android:layout_width="240dp"
android:layout_height="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="30dp"
android:background="#9DBABAB6"
android:ems="10"
android:hint="Name"
android:inputType="textPersonName"
android:paddingLeft="10dp"
android:textColor="#ffff"
android:textColorHint="#ffffff" >
</EditText>
<EditText
android:id="@+id/email"
android:layout_width="240dp"
android:layout_height="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="10dp"
android:background="#9DBABAB6"
android:ems="10"
android:hint="Email"
android:inputType="textPersonName"
android:paddingLeft="10dp"
android:textColor="#ffffff"
android:textColorHint="#ffffff" />
<EditText
android:id="@+id/password"
android:layout_width="240dp"
android:layout_height="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="10dp"
android:background="#9DBABAB6"
android:ems="10"
android:hint="......"
android:inputType="textPassword"
android:paddingLeft="10dp"
android:textColor="#ffffff"
android:textColorHint="#ffffff" >
</EditText>
<Button
android:id="@+id/btnsignup"
android:layout_width="240dp"
android:layout_height="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="20dp"
android:background="#9D481a0c"
android:bottomLeftRadius="10dp"
android:bottomRightRadius="10dp"
android:text="Register"
android:textColor="#ffffff"
android:topLeftRadius="10dp"
android:topRightRadius="10dp" />
<Button
android:id="@+id/linktologin"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_marginLeft="40dp"
android:layout_marginTop="20dp"
android:background="#1ABABAB6"
android:text="Already have account LOGIN"
android:textColor="#FFFFFF"
android:textSize="16sp" />
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