我有这个代码与ActionBarSHerlock 3完美配合。现在它在启动时给了我IllegalStateException。
我认为这与Fragment替换相关，但我不能说问题是什么。
编辑：我剪切了代码中不流畅且未使用的TabsAdapter部分。
import java.util.ArrayList;
import com.viewpagerindicator.TabPageIndicator;
import com.viewpagerindicator.TitlePageIndicator;
import com.viewpagerindicator.TitleProvider;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentManager;
//import android.support.v4.app.SupportActivity;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.actionbarsherlock.app.SherlockFragmentActivity;
/**
* Demonstrates combining the action bar with a ViewPager to implement a tab UI
* that switches between tabs and also allows the user to perform horizontal
* flicks to move between the tabs.
*/
public class ActionBarTabsPager extends SherlockFragmentActivity implements SecondFragment.OnButtonClickedXListener{
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i("ONCREATE START","ONCREATE START");
setContentView(R.layout.actionbar_tabs_pager);
if (savedInstanceState == null) {
Fragment newFragment = new FirstFragment();
Fragment newFragment2 = new SecondFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.pager, newFragment, "FirstFragment");
Log.i("FirstFragment Added","FirstFragment Added");
ft.add(R.id.pager, newFragment2, "SecondFragment");
Log.i("SecondFragment Added","SecondFragment Added");
ft.commit();
}
//getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//ActionBar.Tab tab1 = getSupportActionBar().newTab().setText("Fragment 1");
//ActionBar.Tab tab2 = getSupportActionBar().newTab().setText("Fragment 2");
mViewPager = (ViewPager)findViewById(R.id.pager);
//mViewPager.setAdapter(new TabsAdapter(this, getSupportActionBar(), mViewPager));
mViewPager.setAdapter(new VPIFragmentAdapter(getSupportFragmentManager()));
//Bind the title indicator to the adapter
TitlePageIndicator titleIndicator = (TitlePageIndicator)findViewById(R.id.titles);
titleIndicator.setViewPager(mViewPager);
//mTabsAdapter = new TabsAdapter(this, getSupportActionBar(), mViewPager);
//mTabsAdapter.addTab(tab1, FirstFragment.class);
//mTabsAdapter.addTab(tab2, SecondFragment.class);//LoaderCursorSupport.CursorLoaderListFragment.class);
if (savedInstanceState != null) {
//getSupportActionBar().setSelectedNavigationItem(savedInstanceState.getInt("index"));
}
Log.i("ONCREATE END","ONCREATE END");
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
//Ripristiniamo lo stato del contento dei fragment nel caso di cambio di activity o di orientamento
FirstFragment ff = (FirstFragment) getSupportFragmentManager().findFragmentByTag("FirstFragment");
View root = ff.getView();
TextView tv = (TextView) root.findViewById(R.id.textView1);
tv.setText(savedInstanceState.getString("textView1content"));
}
@Override
protected void onSaveInstanceState(Bundle outState) {
Log.i("onSaveInstanceState START","onSaveInstanceState START");
super.onSaveInstanceState(outState);
outState.putInt("index", getActionBar().getSelectedNavigationIndex());
//Salvo il contenuto della stringa nel FirstFragment
FirstFragment ff = (FirstFragment) getSupportFragmentManager().findFragmentByTag("FirstFragment");
View root = ff.getView();
TextView tv = (TextView) root.findViewById(R.id.textView1);
outState.putString("textView1content", (String)tv.getText());
Log.i("onSaveInstanceState END","onSaveInstanceState END");
}
public class VPIFragmentAdapter extends FragmentPagerAdapter implements TitleProvider {
public VPIFragmentAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
private FragmentTransaction mCurTransaction = null;
/*public VPIFragmentAdapter(android.support.v4.app.FragmentManager fm) {
super(fm);
}*/
@Override
public Object instantiateItem(View container, int position) {
if (mCurTransaction == null) {
mCurTransaction = getSupportFragmentManager().beginTransaction();
}
// TODO Auto-generated method stub
Fragment fragment = getItem(position);
if (fragment!=null){
Log.i("Fragment Found!","Fragment Found! "+fragment.getTag());
mCurTransaction.attach(fragment);
mCurTransaction.commit();
}
return fragment;//super.instantiateItem(container, position);
}
@Override
public Fragment getItem(int position) {
Log.i("VPI getItem","getItem");
Fragment f;
if (position==0)
{Log.i("VPI position=0","position=0");
f=getSupportFragmentManager().findFragmentByTag("FirstFragment");
Log.i("FOUND FRAGMENT!",""+f.getTag());
return f;}
else if (position==1)
{Log.i("VPI position=1","position=1");
f=getSupportFragmentManager().findFragmentByTag("SecondFragment");
Log.i("FOUND FRAGMENT!",""+f.getTag());
return f;}
else return null;//Fragment.instantiate(mContext, mTabs.get(position), null);
}
@Override
public int getCount() {
return 2;
}
@Override
public String getTitle(int position) {
if (position==0) return "First";
else if (position==1) return "Second";
// TODO Auto-generated method stub
else return null;
}
}
@Override
public void OnButtonClickedX(View v) {
if (v==findViewById(R.id.button1)){
Log.i("TRIGGERED","TRIGGERED");
FirstFragment ff = (FirstFragment) getSupportFragmentManager().findFragmentByTag("FirstFragment");
View root = ff.getView();
TextView tv = (TextView) root.findViewById(R.id.textView1);
Log.i("testo prima della modifica",""+tv.getText());
tv.setText("MODIFICATO");
Log.i("testo dopo la modifica",""+tv.getText());
}
// TODO Auto-generated method stub
}
}
这就是日志
FATAL EXCEPTION: main
java.lang.IllegalStateException: Can't change tag of fragment FirstFragment{40545228 #0 id=0x7f040028 FirstFragment}: was FirstFragment now android:switcher:2130968616:0
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:351)
at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:342)
at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:97)
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649)
at android.support.v4.view.ViewPager.populate(ViewPager.java:783)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
at android.view.View.measure(View.java:8366)
at android.view.ViewRoot.performTraversals(ViewRoot.java:847)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1868)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3691)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
at dalvik.system.NativeStart.main(Native Method)