非常基本actionbarsherlock选项卡与片段：FragmentTransaction在null onTabSelected（）方法

• Z时代
• 2024-01-10
• 分类：问答

我正在实施一些代码（http://arvid-g.de/12/android-4-actionbar-with-tabs例如）并试图将其转换为与ActionBarSherlock一起使用。非常基本actionbarsherlock选项卡与片段：FragmentTransaction在null onTabSelected（）方法

这里是TabActivity.java：

package com.pnet; 
import com.actionbarsherlock.app.ActionBar; 
import com.actionbarsherlock.app.ActionBar.Tab; 
import com.actionbarsherlock.app.SherlockActivity; 
import android.content.Context; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentTransaction; 
import android.util.Log; 
import android.widget.Toast; 
public class TabActivity extends SherlockActivity { 
    private static String TAG = "TabActivity"; 
    public static Context appContext; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.tab_activity); 
     //ActionBar gets initiated 
     ActionBar actionbar = getSupportActionBar(); 
     //Tell the ActionBar we want to use Tabs. 
     actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 
     //initiating both tabs and set text to it. 
     ActionBar.Tab PlayerTab = actionbar.newTab().setText("Fragment A"); 
     ActionBar.Tab StationsTab = actionbar.newTab().setText("Fragment B"); 
    //create the two fragments we want to use for display content 
     Fragment PlayerFragment = new AFragment(); 
     Fragment StationsFragment = new BFragment(); 
    //set the Tab listener. Now we can listen for clicks. 
     PlayerTab.setTabListener(new MyTabsListener(PlayerFragment)); 
     StationsTab.setTabListener(new MyTabsListener(StationsFragment)); 
    //add the two tabs to the actionbar 
     actionbar.addTab(PlayerTab); 
     actionbar.addTab(StationsTab); 
    } 
    class MyTabsListener implements ActionBar.TabListener { 
     public Fragment fragment; 
     public MyTabsListener(Fragment fragment) { 
     this.fragment = fragment; 
     } 
     @Override 
     public void onTabSelected(Tab tab, FragmentTransaction ft) { 
      // TODO Auto-generated method stub 
      if (fragment == null) { 
       Log.v(TAG, "fragment is null"); 
      } 
      if (ft == null) { 
       Log.v(TAG, "fragment TRANSACTION is null"); 
      } 
      ft.replace(R.id.fragment_container, fragment);   
     } 
     @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 
      Toast.makeText(TabActivity.appContext, "Reselected!", Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

这里是AFragment.java

package com.pnet; 
import com.actionbarsherlock.app.SherlockFragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
public class AFragment extends SherlockFragment { 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     return inflater.inflate(R.layout.afragment, container, false); 
    } 
} 

下面是BFragment.java

package com.pnet; 
import com.actionbarsherlock.app.SherlockFragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
public class BFragment extends SherlockFragment { 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     return inflater.inflate(R.layout.bfragment, container, false); 
    } 
} 

这里是tab_activity.xml：

<LinearLayout android:layout_gravity="center" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"> 
<LinearLayout android:id="@+id/fragment_container" android:layout_height="match_parent" android:layout_width="match_parent"> 
</LinearLayout> 
</LinearLayout> 

这里是afragment.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text" 
    android:layout_width="match_parent" android:layout_height="match_parent" 
    android:gravity="center_vertical|center_horizontal" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:text="@string/hello_world"/> 
</LinearLayout> 

这里是bfragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text" 
    android:layout_width="match_parent" android:layout_height="match_parent" 
    android:gravity="center_vertical|center_horizontal" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:text="@string/tab_navigation_content"/> 
</LinearLayout> 

当活动加载它触发onTabSelected()方法。如果语句检查写入日志的null对象，并且它显示FragmentTransaction对象为null，那么我就放了一对。任何人都可以看到我要去哪里？谢谢。

回答：

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