java.lang.NullPointerException at Intent

Question

I am quite new to Java and Android programming, and just working on my 3rd App - however I am encountering a Problem which I am not able to solve (I already tried and researched for days).

I have a list of Elements in a LinearLayout inside a Fragment - the Elements have a OnLongClickListener attached, with a popup showing up when the User long-presses the Element. That works fine. However, one of the Buttons in the Popup is "Edit", and when a user presses this Button, I want to start another Activity with Editing Options for this Element.

So there comes my Problem: when I want to start the new Activity with an Intent, I get following Error:

E/AndroidRuntime: FATAL EXCEPTION: main
        java.lang.NullPointerException
        at android.app.Activity.startActivityForResult(Activity.java:3370)
        at android.app.Activity.startActivityForResult(Activity.java:3331)
        at android.app.Activity.startActivity(Activity.java:3566)
        at android.app.Activity.startActivity(Activity.java:3534)
        at at.fekle.zipmanager.start.startzipinfo(start.java:299)
        at at.fekle.zipmanager.start$2.onLongClick(start.java:277)
        at android.view.View.performLongClick(View.java:4247)
        at android.view.View$CheckForLongPress.run(View.java:17341)
        at android.os.Handler.handleCallback(Handler.java:725)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5227)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
        at dalvik.system.NativeStart.main(Native Method)

But, if i start the same Activity with the same Intent from a simple Button defined in the Layout, the Activity Starts fine without any Errors... weird, isn't it?

So, does anyone have an Idea how I can solve this problem?

Here are some extractions from my code:

The Creation of the Elements with the OnLongClickListener:

ScrollView parent = (ScrollView) maininflater.inflate(R.layout.start_ziplist_fragment_superwrapper, null, false);
    inf = maininflater;
    LinearLayout ll = (LinearLayout) maininflater.inflate(R.layout.start_ziplist_fragment_wrapper, parent, false);

    for (Integer i = 0; i < count; i++) {
        ArrayList<String> data = new DB(cont).getAllZips().get(i);
        View custom = maininflater.inflate(R.layout.start_ziplist_fragment_inner, ll, false);
        TextView tv = (TextView) custom.findViewById(R.id.ziplist_name);
        TextView tv2 = (TextView) custom.findViewById(R.id.ziplist_text);
        tv.setText(data.get(2));
        tv2.setText(data.get(1));
        Integer id =  Integer.valueOf(data.get(0));
        custom.setId(id);

        custom.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                Integer id = view.getId();
                startzipinfo(id);
                return true;
            }
        });

        ll.addView(custom);
    }
    parent.addView(ll);

The void which starts the Activity:

public void startzipinfo(Integer id){
    Intent in = new Intent(getApplicationContext(), zipinfo.class);
    startActivity(in);
}

I'm looking forward to your Answers,

Felix

EDIT: This is the Activity which is about to be started:

package at.fekle.zipmanager;
import android.app.Activity;
import android.os.Bundle;

/**
 * Created by felix on 27.06.13.
 */
public class zipinfo extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.zipinfo);
    }
}

are You sure that ArrayList<String> data is not null? Maybe You cannot get the data from database for any reason — Opiatefuchs
– Opiatefuchs, Commented Jun 28, 2013 at 8:14
post your zipinfo.class. because error can occur in this files too. — Nirmal
– Nirmal, Commented Jun 28, 2013 at 8:16
the data is fine, my list gets filled with the data from the database, no problem there ;) — fekle
– fekle, Commented Jun 28, 2013 at 8:16

Dimmerg · Accepted Answer · 2013-06-28 08:09:07Z

1

Try to use YourActivityName.this instead of getApplicationContext() :

public void startzipinfo(Integer id){
    Intent in = new Intent(YourActivityName.this, zipinfo.class);
    startActivity(in);
}

answered Jun 28, 2013 at 8:09

Dimmerg

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Comments

user2523388 · Accepted Answer · 2013-06-28 08:16:27Z

0

Check whether your new intent class is mentioned in android manifest file if it does not exists then type:<activity name=".YourClassName> </activity>

answered Jun 28, 2013 at 8:16

user2523388

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2 Comments

Plato Over a year ago

But he said it starts some times, but not every time

fekle Over a year ago

Yes, it is included :-) Like @Plato said, it starts with a normal button, the problem only exists when starting the activity from the LongClickListener...

fekle · Accepted Answer · 2013-06-28 11:12:52Z

0

I just solved the problem!

I had to start the activity from the parent Fragment (passed to the method by the FragmentManager) - now everything works like a charm :)

custom.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View view) {
                    Integer id = view.getId();
                    id = 2;
                    Intent intent = new Intent(cont, zipinfo.class);
                    fragment.startActivity(intent);
                    return true;
                }
            });

Thanks for all answers!

Cheers,

Felix

answered Jun 28, 2013 at 11:12

fekle

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1 Comment

kumar Over a year ago

I am facing the same issue.. can you please elaborate this. what is the variable fragment? can u show its declaration too, it will be helpfull

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