Android ActionBar详解(三)：ActionBar实现切换Tabs标签

实现切换Tabs标签;

  

 Activity代码：  

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.action_bar_tabs);
}

public void onAddTab(View v) {
final ActionBar bar = getActionBar();
final int tabCount = bar.getTabCount();
final String text = "Tab " + tabCount;

bar.addTab(bar.newTab().setText(text)
.setTabListener(new TabListener(new TabContentFragment(text))));
}

public void onRemoveTab(View v) {
final ActionBar bar = getActionBar();
bar.removeTabAt(bar.getTabCount() - 1);
}

public void onToggleTabs(View v) {
final ActionBar bar = getActionBar();

if (bar.getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) {
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);

bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE, ActionBar.DISPLAY_SHOW_TITLE);
} else {
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
}
}

public void onRemoveAllTabs(View v) {
getActionBar().removeAllTabs();
}

private class TabListener implements ActionBar.TabListener {
private TabContentFragment mFragment;
public TabListener(TabContentFragment fragment) {

mFragment = fragment;
}

public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.add(R.id.fragment_content, mFragment, mFragment.getText());
}


public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(mFragment);
}

public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(ActionBarTabs.this, "Reselected!", Toast.LENGTH_SHORT).show();
}

}

private class TabContentFragment extends Fragment {
private String mText;
public TabContentFragment(String text) {
mText = text;
}

public String getText() {
return mText;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragView = inflater.inflate(R.layout.action_bar_tab_content, container, false);
TextView text = (TextView) fragView.findViewById(R.id.text);
text.setText(mText);
return fragView;
}
}
}

涉及的布局文件action_bar_tabs.xml代码为:

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

< FrameLayout android:id="@+id/fragment_content"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" />

< LinearLayout android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:orientation="vertical">

< Button android:id="@+id/btn_add_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_add_tab"
android:onClick="onAddTab" />

< Button android:id="@+id/btn_remove_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_remove_tab"
android:onClick="onRemoveTab" />

< Button android:id="@+id/btn_toggle_tabs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_toggle_tabs"
android:onClick="onToggleTabs" />

< Button android:id="@+id/btn_remove_all_tabs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_remove_all_tabs"
android:onClick="onRemoveAllTabs" />
< /LinearLayout>

< /LinearLayout>

布局文件action_bar_tab_content.xml;

< ?xml version="1.0" encoding="utf-8"?>  

< TextView xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />