java.lang.IllegalStateException：操作栏选项卡必须具有回调

我正在尝试向我的应用程序添加一个带有4个选项卡的ActionBarSherlock 。 我试图从SherlockActivity扩展到SherlockFragmentActivity`，但我仍然得到这个例外：

java.lang.IllegalStateException：操作栏选项卡必须具有回调。 

  import java.io.IOException; import java.net.URL; import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.ResponseHandler; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.BasicResponseHandler; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.json.JSONArray; import org.json.JSONObject; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.app.ActionBar.Tab; import com.actionbarsherlock.app.ActionBar.TabListener; import com.actionbarsherlock.app.SherlockActivity; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import twitter4j.Status; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.TwitterFactory; import twitter4j.auth.AccessToken; import twitter4j.auth.RequestToken; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.AsyncTask; import android.os.Bundle; import android.os.StrictMode; import android.preference.PreferenceManager; import android.support.v4.app.FragmentTransaction; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class HomeActivity extends SherlockFragmentActivity implements OnClickListener, OnItemClickListener, TabListener { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.homelayout); try{ ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); Tab homeTab = actionBar.newTab(); homeTab.setIcon(R.drawable.tab_home); Tab exploreTab = actionBar.newTab(); exploreTab.setIcon(R.drawable.tab_explore); Tab leaderBoardTab = actionBar.newTab(); leaderBoardTab.setIcon(R.drawable.tab_leaderboard); Tab profileTab = actionBar.newTab(); profileTab.setIcon(R.drawable.tab_profile); actionBar.addTab(homeTab); actionBar.addTab(exploreTab); actionBar.addTab(leaderBoardTab); actionBar.addTab(profileTab); }catch(Exception ex){ Log.e("error from onCreate" , ex.toString()); Log.e("error from onCreate" , ex.getStackTrace().toString()); } } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } @Override public void onTabUnselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } }

在将选项卡添加到actionBar之前，必须在选项卡上注册ActionBar.TabListener。

在你的情况下： 

 Tab homeTab = actionBar.newTab(); homeTab.setTabListener(this) //'this' because your activity implements a TabListener ... actionBar.addTab(homeTab);

否则我会建议你在他们自己的类中实现你的监听器，这样你的Activity就不会失去它的目的，也很容易被忽视和读取。

您可以像这样重复选项卡监听器 

  ActionBar.Tab tab1 = actionBar.newTab(); tab1.setText("Tab 1"); tab1.setTabListener(this); ActionBar.Tab tab2 = actionBar.newTab(); tab2.setText("Tab 2"); tab2.setTabListener(this); ActionBar.Tab tab3 = actionBar.newTab(); tab3.setText("Tab 3"); tab2.setTabListener(this); **// this is must be tab3 not tab2**
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