我收到标题中所述的 IllegalStateException，我知道这是因为我在某个地方添加了一个已经有父级的 View ，但我找不到在哪里？我已经尝试了一些不同的解决方案，为其他遇到此问题的人找到了解决方案，但它没有起作用，因为他们似乎是从比我更好的另一个来源得到这个问题的。非常感谢您的帮助!
错误堆栈:
10-26 17:46:54.783: E/AndroidRuntime(14255): FATAL EXCEPTION: main
10-26 17:46:54.783: E/AndroidRuntime(14255): Process: com.example.digiexammobile, PID: 14255
10-26 17:46:54.783: E/AndroidRuntime(14255): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addViewInner(ViewGroup.java:3562)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3415)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3360)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3336)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2552)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1915)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5603)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer.doFrame(Choreographer.java:544)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Handler.handleCallback(Handler.java:733)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Handler.dispatchMessage(Handler.java:95)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Looper.loop(Looper.java:136)
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.app.ActivityThread.main(ActivityThread.java:5146)
10-26 17:46:54.783: E/AndroidRuntime(14255): at java.lang.reflect.Method.invokeNative(Native Method)
10-26 17:46:54.783: E/AndroidRuntime(14255): at java.lang.reflect.Method.invoke(Method.java:515)
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
10-26 17:46:54.783: E/AndroidRuntime(14255): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
10-26 17:46:54.783: E/AndroidRuntime(14255): at dalvik.system.NativeStart.main(Native Method)
我在此处找不到对我的任何文件的任何引用？
我正在标准选项卡式应用程序之上构建(来自 Eclipse 创建应用程序指南)，但我对支持库替代方案进行了一些更改，以便将其与 SwipeRefreshLayout 一起使用。
我的MainActivity.java:
package com.example.digiexammobile;
import java.util.Locale;
import android.app.ActionBar.Tab;
import android.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v13.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
NWManager nwmanager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
nwmanager = new NWManager();
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(
actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
Fragment[] fragments = new Fragment[this.getCount()];
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
if(fragments[position] == null){
fragments[position] = (Fragment) LibraryListFragment.newInstance(nwmanager);
}
return fragments[position];
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
}
LibraryListFragment.java:
package com.example.digiexammobile;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
public class LibraryListFragment extends Fragment {
BaseAdapter listadapter;
NWManager nwmanager;
public static LibraryListFragment newInstance(NWManager nwmanager){
LibraryListFragment fragment = new LibraryListFragment();
fragment.nwmanager = nwmanager;
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_librarylist, container);
final String[] values = new String[] { "Android", "iPhone", "WindowsMobile",
"Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
"Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
"Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
"Linux", "OS/2" }; // You have the necessary data to bind the list.
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, android.R.id.text1, values); // You have set the previous array to an adapter that can be now setted to a list.
ListView list = (ListView) rootView.findViewById(R.id.librarylist);
list.setAdapter(adapter);
return rootView;
}
public void notifyDataSetChanged(){
listadapter.notifyDataSetChanged();
}
}
最后是我的fragment_librarylist.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/librarylist">
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>
非常感谢!
最佳答案
在 LibraryListFragment 的 onCreateView 中，更改以下内容:
View rootView = inflater.inflate(R.layout.fragment_librarylist, container);
对此:
View rootView = inflater.inflate(R.layout.fragment_librarylist, container, false);
关于java - Android 非法状态异常 : The specified child already has a parent，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26575629/