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>