Android ActionBar制作时钟实例解析

package com.example.days19actionbar07custom; import com.example.days19actionbar07custom.R; import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.MenuItem.OnActionExpandListener;import android.view.View;import android.widget.AnalogClock;import android.widget.SearchView;import android.widget.SearchView.OnQueryTextListener;import android.widget.TextView; public class MainActivity extends Activity {   private TextView txtResult = null;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);     txtResult = (TextView) findViewById(R.id.txtResult);  }   @Override  public boolean onCreateOptionsMenu(Menu menu) {    getMenuInflater().inflate(R.menu.main, menu);          /**************searchView*****************/    // 通过id找到相对应的MenuItem（SearchView）    MenuItem searchItem = menu.findItem(R.id.action_search);     SearchView view = (SearchView) searchItem.getActionView();     // 给SearchView设置文字改变的监听    view.setOnQueryTextListener(new OnQueryTextListener() {       @Override      public boolean onQueryTextSubmit(String query) {        return false;      }       @Override      public boolean onQueryTextChange(String newText) {        txtResult.setText("您正在搜索" + newText);        return false;      }    });         /**************自定义条目*****************/         // 通过id找到自定义布局MenuItem    MenuItem customItem = menu.findItem(R.id.action_custom_layout);         // 通过menuItem的getActionView（）方法得到一个View对象    View v = customItem.getActionView();         // 可以通过v的findViewById()方法找到自定义布局中的相对应的控件    AnalogClock acClock = (AnalogClock) v.findViewById(R.id.acClock);         // 给customItem菜单条目设置展开折叠监听    customItem.setOnActionExpandListener(new OnActionExpandListener() {             /**       * 菜单条目被展开       * 返回为true代表该条目菜单可以被展开       * @Override       */      public boolean onMenuItemActionExpand(MenuItem item) {        txtResult.setText("时钟被展开");        return true;      }             /**       * 菜单条目被折叠       * 返回为true代表该条目菜单可以被折叠       * @Override       */      public boolean onMenuItemActionCollapse(MenuItem item) {        txtResult.setText("时钟被折叠");        return true;      }    });    return true;  } }

<menu xmlns:android="http://schemas.android.com/apk/res/android" >   <item    android:id="@+id/action_search"    android:orderInCategory="100"    android:actionViewClass="android.widget.SearchView"    android:showAsAction="always"    android:title="@string/it_search"/>   <item    android:id="@+id/action_custom_layout"    android:actionLayout="@layout/my_layout"    android:orderInCategory="100"    android:icon="@drawable/ic_launcher"    android:showAsAction="always|collapseActionView"    android:title="layout"/> </menu>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context=".MainActivity" >   <TextView    android:id="@+id/txtResult"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/hello_world" /> </RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context=".MainActivity" >   <AnalogClock    android:id="@+id/acClock"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/hello_world" /> </RelativeLayout>