NullPointerException Passing data from Activity to Intent

Question

I am working on android application but i want to pass some data from an activity to an intent from which is shown in an activity in form of navigation drawer But when i run it i get a null pointer exception. Here is my Activity method

String EXTRA_LOGIN_DATA = "TATA";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent intent = getIntent();
    messageText = intent.getStringExtra(userData);


    Bundle bundle = new Bundle();
    bundle.putString(EXTRA_LOGIN_DATA, messageText);
    // set Fragmentclass Arguments
    HomeFragment fragobj = new HomeFragment();
    fragobj.setArguments(bundle);

And here is my Fragment method:

String EXTRA_USER_DATA;
private int lastX = 0;
TextView textView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View  rootView = inflater.inflate(R.layout.fragment_home, container, false);


    Bundle bundle = getArguments();
    user_data = bundle.getString(new MainActivity().EXTRA_LOGIN_DATA);

But when i run the code i get:

`E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: info.androidhive.slidingmenu, PID: 7508
                                                                        java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.slidingmenu/info.androidhive.slidingmenu.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                            at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                         Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
                                                                            at info.androidhive.slidingmenu.HomeFragment.onCreateView(HomeFragment.java:51)
                                                                            at android.app.Fragment.performCreateView(Fragment.java:2220)
                                                                            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:973)
                                                                            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
                                                                            at android.app.BackStackRecord.run(BackStackRecord.java:793)
                                                                            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
                                                                            at android.app.FragmentController.execPendingActions(FragmentController.java:325)
                                                                            at android.app.Activity.performStart(Activity.java:6252)
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
                                                                            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                            at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                            at android.os.Looper.loop(Looper.java:148) 
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                            at java.lang.reflect.Method.invoke(Native Method) 
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)`

Can anyone please help me where the exception comes and how to solve it

check if your getting the String **"TATA"** from this code `new MainActivity().EXTRA_LOGIN_DATA`. ?? — Janki Gadhiya, May 09 '16 at 06:18
Show more lines of code after `fragobj.setArguments(bundle);` line — ρяσѕρєя K, May 09 '16 at 06:22
My Fragment is displayed as navigation drawer in Mainactivity — Nyerere, May 09 '16 at 06:39

score 0 · Answer 1 · answered May 09 '16 at 06:33

0

you should call setArguments before add Fragment to Activity, So don't write fragment in your layout xml. just use getSupportFragmentManager().beginTransaction().replace(placeHolderId, fragment).commit(); after setArguments

answered May 09 '16 at 06:33

rainash

864
6
15

Sorry but my fragment i put it on activity as navigation drawer @rainash – Nyerere May 09 '16 at 06:38
@Nyerere you can override the `setArguments` in your fragment to get the arguments, the cause of the `NullPointException` is `onCreateView` is called before `setArguments` – rainash May 09 '16 at 06:46

score 0 · Answer 2 · answered May 09 '16 at 06:54

From Activity you send data with intent as:

Bundle bundle = new Bundle();
bundle.putString("EXTRA_LOGIN_DATA", "messageText");
HomeFragment fragobj = new HomeFragment();
fragobj.setArguments(bundle);

and in Fragment onCreateView method:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    String strtext = getArguments().getString("EXTRA_LOGIN_DATA");
    return inflater.inflate(R.layout.fragment_home, container, false);
}

score 0 · Answer 3 · answered May 09 '16 at 06:55

0

Check your "messageText" first. if you get that value null than make it correct.

answered May 09 '16 at 06:55

Ishani shah

1
3

NullPointerException Passing data from Activity to Intent

3 Answers3