6. ActionBar详解

ActionBar简介

 隐藏和显示ActionBar

隐藏ActionBar      getActionBar().hide();

显示ActionBar      getActionBar().show();

 添加和响应Action按钮

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >
     <Button
         android:id="@+id/button_hide_show_actionbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:onClick="onClick_HideShowActionBar"
         android:text="隐藏ActionBar" />
 </LinearLayout>

 package cn.eoe.first.actionbar;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.Window;
 import android.widget.Button;
 import android.widget.Toast;

 public class FirstActionBarActivity extends Activity {
     private Button hideShowActionBar;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
         setContentView(R.layout.activity_first_action_bar);
         hideShowActionBar = (Button) findViewById(R.id.button_hide_show_actionbar);
     }

     public void onClick_HideShowActionBar(View view) {
         if (getActionBar() == null)
             return;
         if (getActionBar().isShowing()) {
             getActionBar().hide();
             hideShowActionBar.setText("显示ActionBar");
         } else {
             getActionBar().show();
             hideShowActionBar.setText("隐藏ActionBar");
         }
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         MenuInflater inflater = getMenuInflater();
         inflater.inflate(R.menu.activity_first_action_bar, menu);
         // menu.getItem(2).setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
         return true;
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         Toast.makeText(this, item.getTitle(), Toast.LENGTH_LONG).show();
         return super.onOptionsItemSelected(item);
     }

 }

 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android" >

     <item
         android:id="@+id/menu_save"
         android:icon="@drawable/save"
         android:showAsAction="ifRoom|withText"
         android:title="保存"/>
     <item
         android:id="@+id/menu_open"
         android:icon="@drawable/open"
         android:showAsAction="ifRoom"
         android:title="打开"/>
     <item
         android:id="@+id/menu_search"
         android:icon="@drawable/search"
         android:showAsAction="always"
         android:title="保存"/>
     <item
         android:id="@+id/menu1"
         android:icon="@drawable/ic_launcher"
         android:showAsAction="ifRoom"
         android:title="菜单项1"/>
     <item
         android:id="@+id/menu2"
         android:icon="@drawable/ic_launcher"
         android:showAsAction="ifRoom"
         android:title="菜单项2"/>

 </menu>

 可上下两分的Action

 package cn.eoe.split.actionbar;

 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.view.MenuInflater;

 public class SplitActionBar extends Activity {

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

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         MenuInflater inflater = getMenuInflater();
         inflater.inflate(R.menu.activity_split_action_bar, menu);
         return true;
     }
 }

 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android" >

     <item
         android:id="@+id/menu_save"
         android:icon="@drawable/open"
         android:showAsAction="always|withText"/>
     <item
         android:id="@+id/menu_open"
         android:icon="@drawable/open"
         android:showAsAction="always"
         android:title="打开"/>
     <item
         android:id="@+id/menu_search"
         android:icon="@drawable/search"
         android:showAsAction="always"
         android:title="保存"/>
     <item
         android:id="@+id/menu1"
         android:icon="@drawable/ic_launcher"
         android:showAsAction="always"
         android:title="菜单项1"/>
     <item
         android:id="@+id/menu2"
         android:icon="@drawable/ic_launcher"
         android:showAsAction="always"
         android:title="菜单项2"/>

 </menu>

 收缩和展开Action View 

 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.MenuItem.OnActionExpandListener;
 import android.widget.Toast;

 @SuppressLint("NewApi")
 public class ActionViewActivity extends Activity implements
         OnActionExpandListener {
     // private Menu menu;

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

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.activity_action_view, menu);
         // this.menu = menu;
         for (int i = 0; i < menu.size(); i++) {
             menu.getItem(i).setOnActionExpandListener(this);
         }
         return true;
     }

     @Override
     public boolean onMenuItemActionExpand(MenuItem item) {
         Toast.makeText(this, "<" + item.getTitle() + ">已经展开", Toast.LENGTH_LONG)
                 .show();

         return true;
     }

     @Override
     public boolean onMenuItemActionCollapse(MenuItem item) {
         Toast.makeText(this, "<" + item.getTitle() + ">已经收缩", Toast.LENGTH_LONG)
                 .show();
         return true;
     }

 }

res/menu/activity_action_view.xml

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

     <item
         android:id="@+id/menu_item_edit"
         android:actionViewClass="android.widget.EditText"
         android:showAsAction="always"
         android:title="编辑"/>
     <item
         android:id="@+id/menu_item_clock"
         android:actionLayout="@layout/action_view_clock"
         android:icon="@drawable/time"

         android:showAsAction="always|collapseActionView"
         android:title="时间"/>
     <item
         android:id="@+id/menu_item_search"
         android:actionViewClass="android.widget.SearchView"
         android:icon="@drawable/search"
         android:showAsAction="always|collapseActionView"
         android:title="搜素"/>

 </menu>