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我有一个ViewPager和一个PagerTabStrip的MainActivity。我也有一个SettingsFragment和MyFragmentStatePagerAdapter。我在删除碎片时遇到了问题，所以我尝试了几件事来结束我现在的工作。除非我删除一个片段，否则添加片段不是问题。要添加片段，我单击“+”并删除片段，然后单击片段中的按钮。添加到ViewPager的片段为空
例如，假设我添加片段“1”和“2”。然后我删除片段“1”，以便我留下“2”。一切都很好，直到我点击“+”。它添加了一个新的选项卡和页面，但显示了片段应该在的空白页面。如果我再次点击，我得到这个错误。
java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.angelwing.homebase.MyFragmentStatePagerAdapter.getPageTitle(MyFragmentStatePagerAdapter.java:41)
at android.support.v4.view.PagerTitleStrip.updateText(PagerTitleStrip.java:282)
at android.support.v4.view.PagerTitleStrip.updateTextPositions(PagerTitleStrip.java:341)
at android.support.v4.view.PagerTabStrip.updateTextPositions(PagerTabStrip.java:290)
at android.support.v4.view.PagerTitleStrip$PageListener.onPageScrolled(PagerTitleStrip.java:493)
at android.support.v4.view.ViewPager.dispatchOnPageScrolled(ViewPager.java:1955)
at android.support.v4.view.ViewPager.onPageScrolled(ViewPager.java:1924)
at android.support.v4.view.ViewPager.pageScrolled(ViewPager.java:1862)
at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1822)
at android.view.View.updateDisplayListIfDirty(View.java:16451)
at android.view.View.draw(View.java:17238)
at android.view.ViewGroup.drawChild(ViewGroup.java:3923)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3713)
at android.view.View.updateDisplayListIfDirty(View.java:16459)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3907)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3887)
at android.view.View.updateDisplayListIfDirty(View.java:16424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3907)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3887)
at android.view.View.updateDisplayListIfDirty(View.java:16424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3907)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3887)
at android.view.View.updateDisplayListIfDirty(View.java:16424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3907)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3887)
at android.view.View.updateDisplayListIfDirty(View.java:16424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3907)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3887)
at android.view.View.updateDisplayListIfDirty(View.java:16424)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:325)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:331)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:366)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:3134)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2933)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2522)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1437)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7397)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:920)
at android.view.Choreographer.doCallbacks(Choreographer.java:695)
at android.view.Choreographer.doFrame(Choreographer.java:631)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:906)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
我想你所要做的就是在适配器列表中添加和删除项目，所以我不明白为什么我有这样的问题。这是我的MainActivity和MyFragmentStatePagerAdapter的代码。
MyFragmentStatePagerAdapter
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import java.util.ArrayList;
public class MyFragmentStatePagerAdapter extends FragmentStatePagerAdapter
{
private ArrayList<SettingsFragment> fragmentList = new ArrayList<>();
private ArrayList<String> fragmentTitleList = new ArrayList<>();
public MyFragmentStatePagerAdapter(FragmentManager fm)
{
super(fm);
}
public void addFragment(SettingsFragment f, String title)
{
fragmentList.add(f);
fragmentTitleList.add(title);
}
public void deleteFragment (int pos)
{
fragmentList.remove(pos);
fragmentTitleList.remove(pos);
}
@Override
public Fragment getItem(int position)
{
return fragmentList.get(position);
}
@Override
public CharSequence getPageTitle(int position)
{
return fragmentTitleList.get(position);
}
@Override
public int getCount()
{
return fragmentList.size();
}
public void setPageTitle(int pos, String pageTitle)
{
fragmentTitleList.set(pos, pageTitle);
}
@Override
public int getItemPosition(Object object)
{
int position = fragmentList.indexOf(object);
if (position == -1)
return POSITION_NONE;
return position;
// return fragmentList.indexOf(object);
}
}
MainActivity
public class MainActivity extends AppCompatActivity
{
SharedPreferences sp;
private ViewPager viewPager;
private MyFragmentStatePagerAdapter adapter;
Set<String> baseNames;
final int MY_PERMISSIONS_ACCESS_FINE_LOCATION = 1001;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sp = getSharedPreferences("com.angelwing.homebase", Context.MODE_PRIVATE);
////// [Request Permissions] //////
// if permission hasn't been granted yet, request permission
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_ACCESS_FINE_LOCATION);
}
viewPager = (ViewPager) findViewById(R.id.viewPager);
adapter = new MyFragmentStatePagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
// Get number of names
// Add those fragments
adapter.startUpdate(viewPager);
addFragments();
adapter.finishUpdate(viewPager);
AdView bannerAd = (AdView) findViewById(R.id.bannerAd);
bannerAd.loadAd(new AdRequest.Builder().build());
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}
public void addFragments()
{
baseNames = sp.getStringSet("baseNames", new HashSet<String>());
SettingsFragment settingsFragment;
if (baseNames.isEmpty())
{
settingsFragment = new SettingsFragment();
settingsFragment.setIsNew(true);
settingsFragment.setName("");
settingsFragment.setWifi(false);
settingsFragment.setData(false);
settingsFragment.setBluetooth(false);
settingsFragment.setVolume(true);
settingsFragment.setVolumeValue(50);
settingsFragment.setVibrate(false);
adapter.addFragment(settingsFragment, "New Base");
}
else
{
for (String baseName : baseNames)
{
Log.i("Settings", "baseName: " + baseName);
settingsFragment = new SettingsFragment();
settingsFragment.setIsNew(false);
settingsFragment.setName(baseName);
settingsFragment.setWifi(sp.getBoolean(baseName + "wifi", false));
settingsFragment.setData(sp.getBoolean(baseName + "data", false));
settingsFragment.setBluetooth(sp.getBoolean(baseName + "bluetooth", false));
settingsFragment.setVolume(sp.getBoolean(baseName + "volume", false));
settingsFragment.setVolumeValue(sp.getInt(baseName + "volumeValue", 50));
settingsFragment.setVibrate(sp.getBoolean(baseName + "vibrate", false));
adapter.addFragment(settingsFragment, baseName);
}
}
adapter.notifyDataSetChanged();
}
public void deleteFragment(int pos)
{
adapter.startUpdate(viewPager);
adapter.deleteFragment(pos);
adapter.notifyDataSetChanged();
adapter.finishUpdate(viewPager);
}
public MyFragmentStatePagerAdapter getAdapter()
{
return adapter;
}
public ViewPager getViewPager()
{
return viewPager;
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.mymenu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected (MenuItem item)
{
Set<String> bN = sp.getStringSet("baseNames", new HashSet<String>());
baseNames = new HashSet<>(bN);
if (item.getItemId() == R.id.addButton)
{
SettingsFragment settingsFragment = new SettingsFragment();
settingsFragment.setIsNew(true);
settingsFragment.setName("");
settingsFragment.setWifi(false);
settingsFragment.setData(false);
settingsFragment.setBluetooth(false);
settingsFragment.setVolume(true);
settingsFragment.setVolumeValue(50);
settingsFragment.setVibrate(false);
adapter.startUpdate(viewPager);
adapter.addFragment(settingsFragment, "New Base");
adapter.notifyDataSetChanged();
adapter.finishUpdate(viewPager);
viewPager.setCurrentItem(adapter.getCount() - 1);
return true;
}
return super.onOptionsItemSelected(item);
}
}
同样的问题，恐怕。 – Katie