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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); } }
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  • are You sure that ArrayList<String> data is not null? Maybe You cannot get the data from database for any reason Commented Jun 28, 2013 at 8:14
  • post your zipinfo.class. because error can occur in this files too. Commented Jun 28, 2013 at 8:16
  • the data is fine, my list gets filled with the data from the database, no problem there ;) Commented Jun 28, 2013 at 8:16
  • Is this your complete stacktrace? Commented Jun 28, 2013 at 8:16
  • @Nirmal OK, I'll do that Commented Jun 28, 2013 at 8:17

3 Answers 3

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

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

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

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But he said it starts some times, but not every time
Yes, it is included :-) Like @Plato said, it starts with a normal button, the problem only exists when starting the activity from the LongClickListener...
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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

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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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