Ich habe hier mehrere Beiträge über das Abnehmen und Anbringen gelesen. Aber es sollte in Ordnung sein, da ich API 15 verwende.
Ich erhalte von Anfang an eine doppelte Liste, wie Sie auf diesem Bild sehen können:
Ich habe den folgenden Code: (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) {
}
}
}
Und meine 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>