Android ViewPager don';在第二次调用setAdapter()后刷新视图
我的ViewPager有问题。当活动启动时,我运行AsyncTask从服务器下载数据,并调用Android ViewPager don';在第二次调用setAdapter()后刷新视图,android,android-viewpager,viewpagerindicator,Android,Android Viewpager,Viewpagerindicator,我的ViewPager有问题。当活动启动时,我运行AsyncTask从服务器下载数据,并调用pager。setAdapter(currentPager)currentPager是带标签的空片段 当AsyncTask完成下载数据时,我调用pager.setAdapter(currentPager)且前两页为空,其他页正常。如何首先刷新到具有适当数据的页面? 如果没有pager.setAdapter(currentPager),我无法调用setContentView
pager。setAdapter(currentPager)
currentPager
是带标签的空片段
当AsyncTask完成下载数据时,我调用pager.setAdapter(currentPager)代码>且前两页为空,其他页正常。如何首先刷新到具有适当数据的页面?
如果没有pager.setAdapter(currentPager),我无法调用setContentView因为我得到了一个空指针
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
不要重置适配器。相反,在异步任务完成时更新适配器中的数据源,并在适配器上调用notifyDataSetChanged()
我添加了currentPager.notifyDataSetChanged();在onSuccess()中的AsyncTask中,我还尝试了pager.getAdapter().notifyDataSetChanged();但它不起作用。我做错了吗?您是如何将数据插入适配器的?我在活动中为适配器创建变量,首先它是空的(不是null,但它有空片段),我调用setContentView,下一个AsyncTask更改此变量,然后在适配器上调用notifyDataSetChanged()。您得到答案了吗?我面临着与你类似的问题。你有答案吗,伙计?
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