我将 Fragments 用于我的 Sherlock 实现。
public class ActionBarTabs extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
bar.addTab(bar.newTab()
.setText("Home")
.setTabListener(new TabListener<DashBoardFragment>(
this, "home", DashBoardFragment.class, null)));
bar.addTab(bar.newTab()
.setText("Inventory")
.setTabListener(new TabListener<InventoryFragment>(
this, "inventory", InventoryFragment.class, null)));
if (savedInstanceState != null) {
bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; go Location selection
Intent intent = new Intent(ActionBarTabs.this, LocationSelectorActivity.class);
ActionBarTabs.this.startActivityForResult(intent,0);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getSupportActionBar().getSelectedNavigationIndex());
}
public class TabListener<T extends Fragment> implements ActionBar.TabListener {
private final FragmentActivity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private Fragment mFragment;
public TabListener(FragmentActivity activity, String tag, Class<T> clz, Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
mFragment = mActivity.getSupportFragmentManager().findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
ft.detach(mFragment);
}
}
@Override
public void onTabSelected(Tab tab) {
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName(), mArgs);
ft.add(android.R.id.content, mFragment, mTag);
ft.commit();
} else {
ft.attach(mFragment);
ft.commit();
}
}
@Override
public void onTabUnselected(Tab tab) {
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment != null) {
ft.detach(mFragment);
ft.commitAllowingStateLoss();
}
}
@Override
public void onTabReselected(Tab tab) {
}
}
}
将不同片段加载到选项卡中的关键更改是在这些行中将“YOUR_FRAGMENT_NAME”简单地更改为片段类的名称:
bar.addTab(bar.newTab()
.setText("Home")
.setTabListener(new TabListener<YOUR_FRAGMENT_NAME>(
this, "home", YOUR_FRAGMENT_NAME.class, null)));
希望这可以帮助!