ActionBar相关的示例代码第二部分分为两种,作为Android 3.0的重要特性我们直接看代码:
一、使用菜单资源构造
public class ActionBarMechanics extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add("Normal item");
MenuItem actionItem = menu.add("Action Button");
actionItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
actionItem.setIcon(android.R.drawable.ic_menu_share);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Toast.makeText(this, "Selected Item: " + item.getTitle(), Toast.LENGTH_SHORT).show();
return true;
}
}
二、作为Tab切换Fragment
public class ActionBarTabs extends Activity {
@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
<?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">
<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>
涉及布局文件action_bar_tab_content.xml的代码为
<?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" />
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