Android Widget: java.lang.NullPointerException

Question

I wrote an Android widget with alarmmanager as updating process. Sometimes i've got a nullpointer exception. But all objects are initialized...

public void UpdateWidget(Context con)
{
    //Log.d("berlinClock", "UpdateWidget="+i);
    RemoteViews views=new RemoteViews(con.getPackageName(),R.layout.widgetlayout);
    Calendar c = Calendar.getInstance(); 
    int h = c.get(Calendar.HOUR_OF_DAY);
    int m = c.get(Calendar.MINUTE);

    ComponentName thisWidget = new ComponentName(con,widget.class);

    //update views on remoteView
    // GOT NULLPOINTER EXEPTION IN FOLLOWING LINE
    views.setImageViewResource(R.id.wha1, R.drawable.cgrau);
    views.setImageViewResource(R.id.wha2, R.drawable.cgrau);
    ...
    }

Here is the Stacktrace:

java.lang.RuntimeException: Unable to start receiver ms.jung.android.berlinclock.widget: java.lang.NullPointerException
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2821)
at android.app.ActivityThread.access$3200(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at ms.jung.android.berlinclock.widget.UpdateWidget(widget.java:96)
at ms.jung.android.berlinclock.widget.onReceive(widget.java:34)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2810)

Matthias · Accepted Answer · 2012-02-02 12:26:47Z

1

if(views!=null)
{
    ...
}

With this if condition it will not crash anymore, i saw that solution now in many examples, and i think that is the best way to do that.

answered Feb 2, 2012 at 12:26

Matthias

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Comments

8oh8 · Accepted Answer · 2012-01-13 01:20:15Z

0

I think it might be because your RemoteViews object has not yet been inflated.

You can try putting your view inside of a layout, and inflating that layout.

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
RemoteViews view = inflater.inflate(R.layout.widgetlayout,null);

edited Jan 13, 2012 at 1:20

answered Jan 11, 2012 at 12:27

8oh8

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5 Comments

myzinsky Over a year ago

should i do something like: while(views==null){views=...} ?

myzinsky Over a year ago

this inflate method does not exist :(

8oh8 Over a year ago

Oh, my bad, the second parameter should be a ViewGroup object but is optional, should pass null if you don't want to pass an object. I made the correction.

myzinsky Over a year ago

Thats not possible: "cannot convert view to remoteview"

8oh8 Over a year ago

Have you tried running the UpdateWidget method on the activity's onStart() method? onStart() is called when the activity becomes visible so your views must have been inflated by the time they are called.

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