java.lang.IllegalStateException：操作栏选项卡必须有回调
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原文地址: http://stackoverflow.com/questions/11847403/
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java.lang.IllegalStateException: Action Bar Tab must have a Callback
提问by Osama Abulkhair
I am trying to add an ActionBarSherlockwith 4 tabs to my application.
I tried to extend from SherlockActivitythenSherlockFragmentActivity`, but I still get this Exception:
我正在尝试ActionBarSherlock向我的应用程序添加一个带有 4 个选项卡的选项卡。我试图从 SherlockActivity thenSherlockFragmentActivity`扩展，但我仍然得到这个异常：
java.lang.IllegalStateException: Action Bar Tab must have a Callback.
java.lang.IllegalStateException：操作栏选项卡必须有回调。
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
}
}
回答by GMan
You must register an ActionBar.TabListener on a Tab before adding it to the actionBar.
在将它添加到 actionBar 之前，您必须在 Tab 上注册一个 ActionBar.TabListener。
In your case:
在你的情况下：
Tab homeTab = actionBar.newTab();
homeTab.setTabListener(this) //'this' because your activity implements a TabListener
...
actionBar.addTab(homeTab);
Otherwise I would recommend you to implement your listeners in their own classes so that your Activity doesn't loose its purpose and is also easily understendable and readable.
否则，我会建议您在自己的类中实现您的侦听器，以便您的 Activity 不会失去其目的，并且也很容易理解和阅读。
回答by Mina Samir
You may repeat the tab listener as this
您可以像这样重复选项卡侦听器
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**
