CODEWITHSUNDEEP
androidandroid-viewpagerviewpagerindicator
plancys
plancys

Reputation: 3923

ViewPager don't refresh View after second call setAdapter()

I have a problem with ViewPager. When Activity starts I run AsyncTask to download data from server and I call pager.setAdapter(currentPager) currentPager is empty Fragment with labels for ViewPageIndicator.TabPageIndicator 

pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(currentPager);

indicator = (TabPageIndicator) findViewById(R.id.indicator);
        indicator.setViewPager(pager);

when AsyncTask finish download data I call pager.setAdapter(currentPager); and first 2 pages is empty, other pages are OK. How to refresh first to pages with appropriate data? I can't call setContentView without pager.setAdapter(currentPager); because i got a NULL pointer

E/AndroidRuntime(23263): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.windmobile.rbt.android/com.windmobile.rbt.android.category.CategoryActivity}: java.lang.IllegalStateException: ViewPage
r does not have adapter instance.
E/AndroidRuntime(23263):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
E/AndroidRuntime(23263):        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
E/AndroidRuntime(23263):        at android.app.ActivityThread.access$2200(ActivityThread.java:119)
E/AndroidRuntime(23263):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
E/AndroidRuntime(23263):        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(23263):        at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(23263):        at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime(23263):        at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(23263):        at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(23263):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime(23263):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime(23263):        at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(23263): Caused by: java.lang.IllegalStateException: ViewPager does not have adapter instance.
E/AndroidRuntime(23263):        at com.viewpagerindicator.TabPageIndicator.setViewPager(TabPageIndicator.java:205)
E/AndroidRuntime(23263):        at com.windmobile.rbt.android.category.CategoryActivity.onCreate(CategoryActivity.java:115)
E/AndroidRuntime(23263):        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime(23263):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
E/AndroidRuntime(23263):        ... 11 more

Upvotes: 2

Views: 4216

Answers (1)

Bartek Filipowicz
Bartek Filipowicz

Reputation: 1235

Dont reset your adapter. Rather then that, update the data source in the adapter when your async task finishes, and call notifyDataSetChanged() on the adapter.

Upvotes: 1

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