我在此活动中收到IllegalStateException但不太确定发生了什么。这是QuickContactActivity中的ViewPagerAdapter类。
private class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
@Override
public Fragment getItem(int position) {
QuickContactListFragment fragment = new QuickContactListFragment();
final String mimeType = mSortedActionMimeTypes.get(position);
final List<Action> actions = mActions.get(mimeType);
fragment.setActions(actions);
return fragment;
}
@Override
public int getCount() {
return mSortedActionMimeTypes.size();
}
}
以下是崩溃日志：
07-15 09:49:21.060: E/com.##.##.##.Application(12378): Thread uncaught exception:
07-15 09:49:21.060: E/com.##.##.##.Application(12378): java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 0, found: 1 Pager id: com.##.##.android:id/item_list_pager Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.##.contacts.quickcontact.QuickContactActivity$ViewPagerAdapter
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.support.v4.view.ViewPager.populate(ViewPager.java:959)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.View.measure(View.java:15518)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.Choreographer.doFrame(Choreographer.java:532)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.os.Handler.handleCallback(Handler.java:725)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.os.Handler.dispatchMessage(Handler.java:92)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.os.Looper.loop(Looper.java:137)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at java.lang.reflect.Method.invokeNative(Native Method)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at java.lang.reflect.Method.invoke(Method.java:511)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-15 09:49:21.060: E/com.##.##.##.Application(12378): at dalvik.system.NativeStart.main(Native Method)
07-15 09:49:21.060: E/ACRA(12378): ACRA caught a IllegalStateException exception for com.##.##.android. Building report.
答案 0 :(得分：14)
问题是，您在PageAdapter中显示的项目/页面列表发生了变化，您不会调用 pageAdapter.notifyDataSetChanged() 。
如果您继续阅读该消息，则表示等待0项并获得1.这样，您可能在设置适配器接收的所有项目/页面之前设置适配器。< / p>
答案 1 :(得分：1)
我有类似的问题，我在Activity A上有viewpager，然后当用户点击viewpager中的项目时，它也会转到具有viewpager的Activity B.用户从活动B返回到活动A后，它将抛出异常，如下所示：
java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 4, found: 0 Pager id: com.gbu.app.templateforbussiness:id/header_view_pager_list Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.gbu.app.templateforbussiness.adapter.DetailProductPagerAdapter
我认为问题是，viewpager的适配器始终为0的数据内容，因为适配器没有从Activity传递的数据。所以我试着像这个例子一样工作：
DetailProductActivity.class
public class DetailProductActivity extends FragmentActivity {
private ViewPager product_detail_viewpager;
private DetailProductPagerAdapter detail_product_adapter;
private Intent product_detail_intent;
public static List<Product> detail_product;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail_product);
product_detail_viewpager = (ViewPager) findViewById(R.id.detail_product_viewpager);
detail_product = HomeActivity.home_product;
}
@Override
protected void onStart() {
super.onStart();
product_detail_intent = getIntent();
startApp(product_detail_intent);
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
private void startApp(Intent data) {
// TODO Auto-generated method stub
// pass the Array, List of data to viewpager adapter like this
detail_product_adapter = new DetailProductPagerAdapter(getSupportFragmentManager(), detail_product);
product_detail_viewpager.setAdapter(detail_product_adapter);
product_detail_viewpager.setCurrentItem(data.getIntExtra("current_item", 0));
}
}
viewpager的适配器： DetailProductPagerAdapter.class
public class DetailProductPagerAdapter extends FragmentPagerAdapter {
private ProductDetailFragment detail_product_fragment;
private Bundle data;
private List<Product> detail_product;
// the data from Activity passed to this adapter
public DetailProductPagerAdapter(FragmentManager fm, List<Product> p) {
super(fm);
// TODO Auto-generated constructor stub
detail_product = p;
}
// then passing the data again to your fragment class, like this example
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
detail_product_fragment = new ProductDetailFragment(detail_product);
data = new Bundle();
data.putInt("current_item", arg0);
detail_product_fragment.setArguments(data);
return detail_product_fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return detail_product.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
片段类： ProductDetailFragment.class
@SuppressLint("ValidFragment")
public class ProductDetailFragment extends Fragment {
private RelativeLayout detail_item_header;
private ImageView detail_item_imv;
private TextView detail_item_tv_title;
private WebView detail_item_web_content;
private DisplayMetrics detail_metrics;
private List<Product> detail_product;
private int index_item;
// the data from adapter pass it to this fragment
public ProductDetailFragment(List<Product> p) {
detail_product = p;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view_detail = inflater.inflate(R.layout.item_product_detail_viewpager, container, false);
detail_metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(detail_metrics);
savedInstanceState = getArguments();
index_item = savedInstanceState.getInt("current_item");
detail_item_header = (RelativeLayout) view_detail.findViewById(R.id.item_header_product_viewpager);
detail_item_imv = (ImageView) detail_item_header.findViewById(R.id.item_imv_product_viewpager);
detail_item_tv_title = (TextView) detail_item_header.findViewById(R.id.item_tv_title_product_viewpager);
detail_item_web_content = (WebView) view_detail.findViewById(R.id.item_web_product_viewpager);
startApp();
return view_detail;
}
private void startApp() {
// TODO Auto-generated method stub
detail_item_header.getLayoutParams().height = (int) (detail_metrics.heightPixels * 0.38);
if (detail_product.get(index_item).getStatus() == 0) {
new loadImageProduct(detail_item_imv).execute(detail_product.get(index_item).getImage());
}else {
detail_item_imv.setImageBitmap(detail_product.get(index_item).getBmp());
}
detail_item_tv_title.setText(detail_product.get(index_item).getTitle());
String web_content_product = "<!DOCTYPE html>"+
"<html>"+
"<body>"+
"<p>Harga : "+detail_product.get(index_item).getPrice()+"</p><br>"+
detail_product.get(index_item).getDetail()+"<br><br>"+
detail_product.get(index_item).getDetail2()+
"</body>"+
"</html>";
detail_item_web_content.loadDataWithBaseURL("https://www.google.com", web_content_product, "text/html", "UTF-8", null);
}
@Override
public void onDestroy() {
super.onDestroy();
}
private class loadImageProduct extends AsyncTask<String, Integer, Bitmap> {
private Bitmap b;
private ImageView vimv;
private GetImage get_image;
public loadImageProduct(ImageView v) {
vimv = v;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
b = null;
get_image = new GetImage();
}
@Override
protected Bitmap doInBackground(String...url) {
try {
b = get_image.loadImageFromServer(url[0]);
if (b != null)
return b;
} catch(OutOfMemoryError e) {
}
return b;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
detail_product.get(index_item).setBmp(result);
detail_product.get(index_item).setStatus(1);
vimv.setImageBitmap(result);
}
}
}
}
现在，它之前的Exception将不再显示，并且viewpager正常工作。这个方法尝试使viewpager像listview一样，因为listview将通过适配器传递数据，因此即使数据已经更改，适配器也不会丢失数据内容。我希望这个例子可以帮助你解决问题。欢呼声。
答案 2 :(得分：-1)
当我尝试覆盖页面适配器的getCount（）时，它发生在我身上
在授权期间，我只显示一页。在授权结束后，我将页面数量更改为3.如果我不调用InvalidatePageAdapter（）一次，它就会落在我身上
@Override
public int getCount() {
if (mAuthorization_Status == AUTH_STATUS.AUTH_SUCCESS) {
if (!isRefreshed) {
isRefreshed = true;
this.notifyDataSetChanged();
}
return NUM_PAGES;
} else {
return 1;
//return NUM_PAGES;
}
} // END: getCount