我已经实施了很多方法来解决这个问题，但它却一次又一次地出现。
我有一个Fragment EbookFragment，我在其中添加了ViewPager并在ViewPager我正在调用MUPDFActivity类，我转换为fragment。
我从MUPDFActivity转换为Fragment后检查了Activity并且工作正常。我还使用测试ViewPager检查了Fragment并且它也正常工作但当我尝试在MUPDFACtivity中添加ViewPager时，它现在是fragment它会抛出以上例外。
以下是我的代码，请检查
在ViewPager中设置适配器：
adapter = new EbookPagerAdapter(getActivity().getSupportFragmentManager(), lst);
mPager.setAdapter(adapter);
mPager.setOffscreenPageLimit(3);
MuPDFActivity.java：
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// TODO Auto-generated method stub
// return super.onCreateView(inflater, container, savedInstanceState);
View rootView = inflater.inflate(R.layout.mupdf_fragment, container, false);
timer.schedule(timerTask, 10000);
pdfBean = (PDFBean) getArguments().getSerializable(LoginActivity.Extra_Value);
LocationResult locationResult = new LocationResult() {
@Override
public void gotLocation(Location location) {
// Got the location!
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(getActivity(), locationResult);
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cal = Calendar.getInstance();
System.out.println(dateFormat.format(cal.getTime()));
starttime = dateFormat.format(cal.getTime());
startTimer = System.currentTimeMillis();
mAlertBuilder = new AlertDialog.Builder(getActivity());
if (core == null) {
core = (MuPDFCore) getActivity().getLastNonConfigurationInstance();
if (savedInstanceState != null && savedInstanceState.containsKey("FileName")) {
mFileName = savedInstanceState.getString("FileName");
}
}
if (core == null) {
// Intent intent = getActivity().getIntent();
byte buffer[] = null;
// if (Intent.ACTION_VIEW.equals(intent.getAction())) {
// Uri uri = intent.getData();
Uri uri = Uri.parse(getArguments().getString(DisplayDataActivity.EXTRA_URL));
System.out.println("URI to open is: " + uri);
if (uri.toString().startsWith("content://")) {
String reason = null;
try {
InputStream is = getActivity().getContentResolver().openInputStream(uri);
int len = is.available();
buffer = new byte[len];
is.read(buffer, 0, len);
is.close();
} catch (java.lang.OutOfMemoryError e) {
System.out.println("Out of memory during buffer reading");
reason = e.toString();
} catch (Exception e) {
System.out.println("Exception reading from stream: " + e);
// Handle view requests from the Transformer Prime's
// file manager
// Hopefully other file managers will use this same
// scheme, if not
// using explicit paths.
// I'm hoping that this case below is no longer
// needed...but it's
// hard to test as the file manager seems to have
// changed in 4.x.
try {
Cursor cursor = getActivity().getContentResolver().query(uri, new String[] { "_data" }, null, null, null);
if (cursor.moveToFirst()) {
String str = cursor.getString(0);
if (str == null) {
reason = "Couldn't parse data in intent";
} else {
uri = Uri.parse(str);
}
}
} catch (Exception e2) {
System.out.println("Exception in Transformer Prime file manager code: " + e2);
reason = e2.toString();
}
}
if (reason != null) {
buffer = null;
Resources res = getResources();
// AlertDialog alert = mAlertBuilder.create();
// setTitle(String.format(res.getString(R.string.cannot_open_document_Reason),
// reason));
// alert.setButton(AlertDialog.BUTTON_POSITIVE,
// getString(R.string.dismiss), new
// DialogInterface.OnClickListener() {
// public void onClick(DialogInterface dialog, int which) {
// finish();
// }
// });
// alert.show();
return container;
}
}
if (buffer != null) {
// core = openBuffer(buffer, intent.getType());
} else {
core = openFile(Uri.decode(uri.getEncodedPath()));
}
SearchTaskResult.set(null);
}
if (core != null && core.needsPassword()) {
requestPassword(savedInstanceState);
return container;
}
if (core != null && core.countPages() == 0) {
core = null;
}
// }
if (core == null) {
AlertDialog alert = mAlertBuilder.create();
alert.setTitle(R.string.cannot_open_document);
alert.setButton(AlertDialog.BUTTON_POSITIVE, getString(R.string.dismiss), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// finish();
}
});
alert.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// finish();
}
});
alert.show();
return container;
}
// createUI(savedInstanceState);
if (core == null) {
return rootView;
}
// Now create the UI.
// First create the document view
mDocView = new MuPDFReaderView(getActivity()) {
@Override
protected void onMoveToChild(int i) {
if (core == null)
return;
mPageNumberView.setText(String.format("%d / %d", i + 1, core.countPages()));
mPageSlider.setMax((core.countPages() - 1) * mPageSliderRes);
mPageSlider.setProgress(i * mPageSliderRes);
pageNumber = i + 1;
super.onMoveToChild(i);
}
@Override
protected void onTapMainDocArea() {
if (!mButtonsVisible) {
showButtons();
} else {
if (mTopBarMode == TopBarMode.Main)
hideButtons();
}
}
@Override
protected void onDocMotion() {
hideButtons();
}
@Override
protected void onHit(Hit item) {
switch (mTopBarMode) {
case Annot:
if (item == Hit.Annotation) {
showButtons();
mTopBarMode = TopBarMode.Delete;
mTopBarSwitcher.setDisplayedChild(mTopBarMode.ordinal());
}
break;
case Delete:
mTopBarMode = TopBarMode.Annot;
mTopBarSwitcher.setDisplayedChild(mTopBarMode.ordinal());
// fall through
default:
MuPDFView pageView = (MuPDFView) mDocView.getDisplayedView();
if (pageView != null)
pageView.deselectAnnotation();
break;
}
}
};
mDocView.setAdapter(new MuPDFPageAdapter(getActivity(), this, core));
makeButtonsView();
// Set up the page slider
int smax = Math.max(core.countPages() - 1, 1);
mPageSliderRes = ((10 + smax - 1) / smax) * 2;
// Set the file-name text
mFilenameView.setText(mFileName);
// Activate the seekbar
mPageSlider.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onStopTrackingTouch(SeekBar seekBar) {
mDocView.setDisplayedViewIndex((seekBar.getProgress() + mPageSliderRes / 2) / mPageSliderRes);
}
public void onStartTrackingTouch(SeekBar seekBar) {
}
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
updatePageNumView((progress + mPageSliderRes / 2) / mPageSliderRes);
}
});
mLinkButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setLinkHighlight(!mLinkHighlight);
}
});
if (core.hasOutline()) {
mOutlineButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
OutlineItem outline[] = core.getOutline();
if (outline != null) {
OutlineActivityData.get().items = outline;
Intent intent = new Intent(getActivity(), OutlineActivity.class);
startActivityForResult(intent, OUTLINE_REQUEST);
}
}
});
} else {
mOutlineButton.setVisibility(View.GONE);
}
// Reenstate last state if it was recorded
SharedPreferences prefs = getActivity().getPreferences(Context.MODE_PRIVATE);
mDocView.setDisplayedViewIndex(prefs.getInt("page" + mFileName, 0));
if (savedInstanceState == null || !savedInstanceState.getBoolean("ButtonsHidden", false))
showButtons();
if (savedInstanceState != null && savedInstanceState.getBoolean("SearchMode", false))
searchModeOn();
RelativeLayout rv = (RelativeLayout) rootView.findViewById(R.id.rv);
rv.addView(mDocView);
// rv.addView(mButtonsView);
setLinkHighlight(true);
// LinearLayout.LayoutParams relativeParams =
// (LinearLayout.LayoutParams) layout.getLayoutParams();
// relativeParams.setMargins(0, 96, 0, 0);
// layout.setLayoutParams(relativeParams);
return rootView;
}
EBookPagerAdapter：
public class EbookPagerAdapter extends FragmentStatePagerAdapter implements Serializable {
ArrayList<EbookBean> list;
FragmentManager fm;
public EbookPagerAdapter(FragmentManager fm, ArrayList<EbookBean> pdfList) {
super(fm);
this.fm = fm;
list = pdfList;
}
@Override
public float getPageWidth(int position) {
return 1.0f;
}
@Override
public Fragment getItem(int i) {
EbookBean pdf = list.get(i);
// Fragment fragment = new SampleTest();
Fragment fragment = new MuPDFFragment();
Bundle args = new Bundle();
args.putString(DisplayDataActivity.EXTRA_URL, LoginActivity.path + pdf.getPdf_name());
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object)
{
FragmentTransaction ft= fm.beginTransaction();
ft.remove((Fragment) object);
ft.commit();
}
}
错误：
01-17 09:57:59.077: E/AndroidRuntime(8220): FATAL EXCEPTION: main
01-17 09:57:59.077: E/AndroidRuntime(8220): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.addViewInner(ViewGroup.java:3509)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.addView(ViewGroup.java:3380)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.addView(ViewGroup.java:3325)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.addView(ViewGroup.java:3301)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:946)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:482)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:762)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 09:57:59.077: E/AndroidRuntime(8220): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.View.measure(View.java:15848)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.Choreographer.doFrame(Choreographer.java:532)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.os.Handler.handleCallback(Handler.java:730)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.os.Handler.dispatchMessage(Handler.java:92)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.os.Looper.loop(Looper.java:137)
01-17 09:57:59.077: E/AndroidRuntime(8220): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-17 09:57:59.077: E/AndroidRuntime(8220): at java.lang.reflect.Method.invokeNative(Native Method)
01-17 09:57:59.077: E/AndroidRuntime(8220): at java.lang.reflect.Method.invoke(Method.java:525)
01-17 09:57:59.077: E/AndroidRuntime(8220): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-17 09:57:59.077: E/AndroidRuntime(8220): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-17 09:57:59.077: E/AndroidRuntime(8220): at dalvik.system.NativeStart.main(Native Method)