我在这里阅读了几篇关于分离和附加的帖子。但这应该没问题,因为我正在运行 API 15。
我从一开始就得到了一个双重列表,就像你在这张照片上看到的那样:
我有以下代码:(MainActivity)
package dk.metnik.fragmentandactionbar;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import dk.metnik.fragmentandactionbar.fragments.DCIMFragment;
import dk.metnik.fragmentandactionbar.fragments.ESSFragment;
import dk.metnik.fragmentandactionbar.fragments.TeamshareFragment;
public class FragAndBarActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setupTabs();
}
private void setupTabs() {
// setup action bar for tabs
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
Tab tab = actionBar
.newTab()
.setText("DCIM")
.setTabListener(
new MyTabListener<DCIMFragment>(this, "DCIM",
DCIMFragment.class));
actionBar.addTab(tab);
tab = actionBar
.newTab()
.setText("ESS")
.setTabListener(
new MyTabListener<ESSFragment>(this, "ESS",
ESSFragment.class));
actionBar.addTab(tab);
tab = actionBar
.newTab()
.setText("TeamShare")
.setTabListener(
new MyTabListener<TeamshareFragment>(this, "TeamShare",
TeamshareFragment.class));
actionBar.addTab(tab);
}
public static class MyTabListener<T extends Fragment> implements
TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
/**
* Constructor used each time a new tab is created.
*
* @param activity
* The host Activity, used to instantiate the fragment
* @param tag
* The identifier tag for the fragment
* @param clz
* The fragment's Class, used to instantiate the fragment
*/
public MyTabListener(Activity activity, String tag, Class<T> clz) {
mActivity = activity;
mTag = tag;
mClass = clz;
mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment != null) { // && !mFragment.isDetached()) {
FragmentTransaction ft = mActivity.getFragmentManager()
.beginTransaction();
// ft.detach(mFragment);
ft.remove(mFragment);
ft.commit();
}
}
/* The following are each of the ActionBar.TabListener callbacks */
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Check if the fragment is already initialized
if (mFragment == null) {
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.add(R.id.listFragment, mFragment, mTag);
} else {
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
}
还有我的 main.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" >
<fragment
android:id="@+id/listFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?android:attr/actionBarSize"/>
</LinearLayout>