ActionBar 的简单使用

最新推荐文章于 2025-09-12 17:34:15 发布

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最新推荐文章于 2025-09-12 17:34:15 发布

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文章标签：移动开发

原文链接：http://www.cnblogs.com/whyalwaysme/p/4596862.html

本文详细介绍了如何在Android应用中实施并利用ActionBar这一关键UI元素，包括其核心功能、创建方法以及与不同兼容版本的适配策略。通过配置ActionBar，开发者能够为应用赋予统一的身份标识，提供搜索功能，并实现导航与视图切换，从而提升用户体验的一致性和应用的整体功能性。

About ActionBar

The action bar is one of the most important design elements you can implement for your app's activities. It provides several user interface features that make your app immediately familiar to users by offering consistency between other Android apps. Key functions include:

A dedicated space for giving your app an identity and indicating the user's location in the app.

Access to important actions in a predictable way (such as Search).

Support for navigation and view switching (with tabs or drop-down lists).

ActionBar 的创建

如果最低兼容版本小于3.0 --> Support Android 2.1 and Above

Setting Up the Action Bar

1.引用V7-appcompat
> To get started, read the Support Library Setup document and set up the v7 appcompat library
2.Activity继承ActionBarActivity
> Update your activity so that it extends ActionBarActivity
3.在配置清单文件中，android:theme="@style/Theme.AppCompat.Light"
> In your manifest file, update either the <application> element or individual <activity> elements to use one of the Theme.AppCompat themes.

Adding Action Buttons

Add an <item> element for each item you want to include in the action bar. For example:

res/menu/main_activity_actions.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
    <!-- Search, should appear as action button -->
    <item android:id="@+id/action_search"
          android:icon="@drawable/ic_action_search"
          android:title="@string/action_search"
          yourapp:showAsAction="ifRoom"  />
    ...
</menu>

如果最低兼容版本大于3.0 --> Support Android 3.0 and Above Only

Setting Up the Action Bar

在配置清单文件中，android:theme="@android:style/Theme.Holo..."

Adding Action Buttons

Add an <item> element for each item you want to include in the action bar. For example:

res/menu/main_activity_actions.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- Search, should appear as action button -->
    <item android:id="@+id/action_search"
          android:icon="@drawable/ic_action_search"
          android:title="@string/action_search"
          android:showAsAction="ifRoom" />
    <!-- Settings, should always be in the overflow -->
    <item android:id="@+id/action_settings"
          android:title="@string/action_settings"
          android:showAsAction="never" />
</menu>

ActionBar的搜索功能

在Activity中，增加以下代码:

	public boolean onCreateOptionsMenu(Menu menu) {
	    MenuInflater inflater = getMenuInflater();
	    inflater.inflate(R.menu.activity_main, menu);
	    
	    // 不兼容低版本
	    SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
           searchView.setOnQueryTextListener(this);		// 搜索的监听
	    
	    return super.onCreateOptionsMenu(menu);
	}

	public boolean onOptionsItemSelected(MenuItem item) {
	    // Handle presses on the action bar items
	    switch (item.getItemId()) {
	        case R.id.action_search:
	            openSearch();
	            return true;
	        default:
	            return super.onOptionsItemSelected(item);
	    }
	}

转载于:https://www.cnblogs.com/whyalwaysme/p/4596862.html