多谢您的协助。很抱歉，如果这是一个非常愚蠢的问题，但是我在其他地方找不到。基本上，我想要确定在ViewPager中全部设置后的总页数，就像在代码中一样。我已经尝试（在更高版本上）将“大小变量”添加到f作为其参数（请参见FirstFragment）。这不是一个已知的数字，因为用户输入的是我将创建的表单（视图）的数量，并将其作为意图传递给FirstFragment。所以我尝试了：
Fragment f = new UserFragment(); Bundle bundl = new Bundle(); bundl.putInt("pagenumbers", size); f.setArguments(bundl); lf.add(f);
在FirstFragment内部。但是，当UserFragment在“ pagenumbers”下提取其参数时，它返回0。然后，我尝试获取对存在于FragmentAdapter中的getCount（）方法的访问权限，但是，我不确定该如何处理需要时在UserFragment里面。
我想做的可能是澄清一下，因为我的早期帖子和提供帮助的人正在提取“当前页面信息”，现在我可以使用该信息。现在，我想看看是否“当前页面==大小（//这是页面数。viewpager中的总视图）”。因此，在onClick方法中，您可以在UserFragment中看到它是否是最后一页，并且用户单击该按钮可以转到下一页。我希望它跳到另一个活动，在该活动中它处理从所有表单收集的所有SparseArray数据。（虽然我需要有关如何将这个SparseArray数据放入意图的帮助，但我可能会对此提出一个新的问题…，因为它并不是很相关）。因此，如果您可以帮助我获得当前的工作尝试（如何正确地完成工作），或者只是建议一种全新的方法让我感到高兴。
非常感谢您的所有帮助。请帮忙！
我的UserFragment.java ：
package com.example.thinice; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class UserFragment extends Fragment { public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.layout_avgcalcform, container, false); final EditText markc = (EditText)rootView.findViewById(R.id.editTextASSMARK); final EditText marktotc = (EditText)rootView.findViewById(R.id.editTextASSTOT); final EditText assvalc = (EditText)rootView.findViewById(R.id.editTextASSWORTH); int currentviewnum = ((FirstFragment) getActivity()).getPager().getCurrentItem(); String pagenum = Integer.toString(currentviewnum); TextView tv = (TextView) rootView.findViewById(R.id.avg_testtv); tv.setText(pagenum); Button b = (Button) rootView.findViewById(R.id.button1); b.setOnClickListener( new View.OnClickListener(){ public void onClick(View v){ int currentviewnum = ((FirstFragment) getActivity()).getPager().getCurrentItem(); ((FirstFragment) getActivity()).saveData(new Question(markc.getText().toString(),marktotc.getText().toString(),assvalc.getText().toString())); ((FirstFragment) getActivity()).getPager().setCurrentItem(currentviewnum+1); } }); return rootView; } }
如果您需要查看更多我的代码，请告诉我。但这真的让我很烦。因此，如果有人可以帮助我，那就太好了！非常感谢您。
FragmentAdapter.java ：
package com.example.thinice; import java.util.ArrayList; import java.util.List; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.view.ViewGroup; public class FragmentAdapter extends FragmentPagerAdapter{ private List<Fragment> fragments; public FragmentAdapter(FragmentManager fragmentManager, ArrayList<Fragment> fragments) { super(fragmentManager); this.fragments = fragments; } @Override public Fragment getItem(int position) { //Bundle args = new Bundle(); //args.putInt("page_position", position+1); //((Fragment) fragments).setArguments(args); return this.fragments.get(position); } @Override public void destroyItem (ViewGroup container, int position, Object object) { super.destroyItem(container, position, object); } @Override public int getCount() { return this.fragments.size(); } }
FirstFragment.java（这是我的活动） ：
package com.example.thinice; import java.util.ArrayList; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.view.ViewPager; import android.util.SparseArray; import android.widget.Button; public class FirstFragment extends FragmentActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout_viewpager); // Check whether the activity is using the layout version with // the fragment_container FrameLayout. If so, we must add the first fragment int size = getIntent().getExtras().getInt("numass1"); ViewPager vp = (ViewPager) findViewById(R.id.viewPager); if (savedInstanceState != null) { return; } ArrayList<Fragment> lf = new ArrayList<Fragment>(); for(int count=0; count<size; count ++){ Fragment f = new UserFragment(); lf.add(f); } FragmentAdapter hello = new FragmentAdapter(getSupportFragmentManager() , lf); vp.setAdapter(hello); // vp.setOffscreenPageLimit(size); } SparseArray<Question> questions = new SparseArray<Question>(); public void saveData(Question quest){ ViewPager vp = (ViewPager) findViewById(R.id.viewPager); questions.put(vp.getCurrentItem(), quest); } public ViewPager getPager() { ViewPager vp = (ViewPager) findViewById(R.id.viewPager); return vp; } }
编辑：建议的解决方案的LOGCAT文件 ：
07-06 20:51:50.241: D/AndroidRuntime(8151): Shutting down VM 07-06 20:51:50.241: W/dalvikvm(8151): threadid=1: thread exiting with uncaught exception (group=0x415a4ba8) 07-06 20:51:50.251: E/AndroidRuntime(8151): FATAL EXCEPTION: main 07-06 20:51:50.251: E/AndroidRuntime(8151): Process: com.example.thinice, PID: 8151 07-06 20:51:50.251: E/AndroidRuntime(8151): java.lang.NullPointerException 07-06 20:51:50.251: E/AndroidRuntime(8151): at com.example.thinice.UserFragment.onCreateView(UserFragment.java:34) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.View.measure(View.java:16497) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.View.measure(View.java:16497) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 07-06 20:51:50.251: E/AndroidRuntime(8151): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.View.measure(View.java:16497) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-06 20:51:50.251: E/AndroidRuntime(8151): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.View.measure(View.java:16497) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.Choreographer.doCallbacks(Choreographer.java:574) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.Choreographer.doFrame(Choreographer.java:544) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.os.Handler.handleCallback(Handler.java:733) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.os.Handler.dispatchMessage(Handler.java:95) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.os.Looper.loop(Looper.java:136) 07-06 20:51:50.251: E/AndroidRuntime(8151): at android.app.ActivityThread.main(ActivityThread.java:5001) 07-06 20:51:50.251: E/AndroidRuntime(8151): at java.lang.reflect.Method.invokeNative(Native Method) 07-06 20:51:50.251: E/AndroidRuntime(8151): at java.lang.reflect.Method.invoke(Method.java:515) 07-06 20:51:50.251: E/AndroidRuntime(8151): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 07-06 20:51:50.251: E/AndroidRuntime(8151): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 07-06 20:51:50.251: E/AndroidRuntime(8151): at dalvik.system.NativeStart.main(Native Method)
您应该使用ViewPager.getAdapter（）。getCount（）getAdapter（）方法返回为ViewPager提供页面的对象。
