I created a new Activity once a Login is successful. But when I start the app, the app crash within 5 seconds with the message
Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
Error is coming from this
name.setText(" "+bundle.getString("name"));
public class LoginActivity extends Activity {
public ImageView bgLogo;
Button login_button;
EditText Username, Password;
String username, password;
String login_url = "http://192.168.0.19/login.php";
AlertDialog.Builder builder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); // Enlever la barre bleue
setContentView(R.layout.activity_login);
initExit ();
builder = new AlertDialog.Builder(LoginActivity.this);
login_button = (Button) findViewById(R.id.bLogin);
Username = (EditText) findViewById(R.id.etUsername);
Password = (EditText) findViewById(R.id.etPassword);
login_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
username = Username.getText().toString();
password = Password.getText().toString();
if (username.equals("") || password.equals("")) {
builder.setTitle("Mince une erreur...");
displayAlert("Veuillez entrer un username et un mot de passe correct...");
}
else {
StringRequest stringRequest = new StringRequest(Request.Method.POST, login_url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONArray jsonArray = null;
try {
jsonArray = new JSONArray(response);
JSONObject jsonObject = jsonArray.getJSONObject(0);
String code = jsonObject.getString("code");
if (code.equals("login_failed")) {
builder.setTitle("Erreur d'authentification");
displayAlert(jsonObject.getString("message"));
}
else {
Intent intent = new Intent (LoginActivity.this, UserAreaActivity.class);
Bundle bundle = new Bundle();
bundle.putString("name", jsonObject.getString("name"));
intent.putExtras(bundle);
startActivity(intent);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Erreur", Toast.LENGTH_LONG).show();
error.printStackTrace();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map <String, String> params = new HashMap<String, String>();
params.put("user_name", username);
params.put("password", password);
return params;
}
};
MySingleton.getInstance(LoginActivity.this).addToRequestque(stringRequest);
}
}
});
}
private void initExit() {
bgLogo = (ImageView) findViewById(R.id.bgLogo1);
bgLogo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (LoginActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
public void displayAlert (String message) {
builder.setMessage(message);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Username.setText("");
Password.setText("");
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
@Override
public void onBackPressed() {
// do nothing.
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
return;
}
}
public class UserAreaActivity extends Activity {
public ImageView bgNet;
public ImageView bgChat;
public ImageView bgStats;
public ImageView bgGo;
public Button bLogout;
TextView name;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); // Enlever la barre bleue
setContentView(R.layout.activity_user_area);
name = (TextView) findViewById(R.id.name);
Bundle bundle = getIntent().getExtras();
name.setText(" "+bundle.getString("name"));
initGoHome ();
initPlay ();
initGoStats ();
initGoChat ();
buttonLogout ();
}
@Override
public void onBackPressed() {
return;
}
private void initGoHome () {
bgNet = (ImageView) findViewById(R.id.bgNet);
bgNet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (UserAreaActivity.this, HomeActivity.class);
startActivity(intent);
}
});
}
private void initPlay () {
bgGo = (ImageView) findViewById(R.id.bgGo);
bgGo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (UserAreaActivity.this, PlayActivity.class);
startActivity(intent);
}
});
}
private void initGoStats () {
bgStats = (ImageView) findViewById(R.id.bgStats);
bgStats.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (UserAreaActivity.this, StatsActivity.class);
startActivity(intent);
}
});
}
private void initGoChat () {
bgChat = (ImageView) findViewById(R.id.bgChat);
bgChat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (UserAreaActivity.this, ChatActivity.class);
startActivity(intent);
}
});
}
private void buttonLogout () {
bLogout = (Button) findViewById(R.id.bLogout);
bLogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
Intent intent = new Intent (UserAreaActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
}
Replace this code snippet:
Bundle bundle = getIntent().getExtras();
name.setText(" "+bundle.getString("name"));
with
Bundle bundle = getIntent().getExtras();
if (bundle != null)
{
name.setText(" "+bundle.getString("name"));
}
Your problem will be solved.
Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
Well, you need to avoid calling a method on a null object. In your case:
name.setText(" "+bundle.getString("name"));
The bundle is a null object in this case. So it throws an error. The solution to avoid this crash is to add a if/else statement
if (bundle != null)
// set text for name like what you have done
else
// set a default text for name
But, I suggest it's better to check your code and understand why your bundle is getting null.
The code is resolved for me by typing in Activity where you get the value by bundle
Bundle bundle = getIntent().getExtras();
hName = bundle.getString("sharedName");
b1 =new Bundle(); //this b1 should be declared Globally where you are getting value
b1.putString("sharedName",hName);
Replace this code snippet:
"class".with(getActivity())
.using(Album.class)
.bucketId(Application.getBucketId())
.entityId(getArguments().getString(YourActivity.GALLERY_ID))
.retrieve(new XXXX()); Change code : Use Bundle method To replace code below type Bundle bundle = getArguments();
"example".with(getActivity())
.using(Album.class)
.bucketId(Application.getBucketId())
.entityId(bundle.getString(YourActivity.GALLERY_ID))
.retrieve(new XXXX());
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