我正在从示例 (http://arvid-g.de/12/android-4-actionbar-with-tabs-example) 中实现一些代码,并尝试将其转换为与 ActionBarSherlock 一起使用。
这是 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);
}
}
这是 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>
这是 fragment .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 Activity 加载时,它会触发
onTabSelected()
方法。我放了几个 if 语句检查对象是否为空,这些语句写入日志并显示 FragmentTransaction 对象为空。有人看到我哪里出错了吗?谢谢。 最佳答案
你应该让你的 Activity 从 SherlockFragmentActivity 而不是 SherlockActivity 扩展,就像你使用 FragmentActivity 而不是 Activity with support-v4 包一样
请在这里查看Fragment示例:https://github.com/JakeWharton/ActionBarSherlock/tree/master/actionbarsherlock-samples/fragments
关于android - 带有 fragment 的非常基本的 actionbarsherlock 标签 : FragmentTransaction is null in the onTabSelected() method,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/13073850/