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上官网学android之四(Supporting Different Devices)

 
阅读更多

官网地址

http://developer.android.com/training/basics/supporting-devices/index.html

 

一、支持不同的语言

和其它程序一样,通常为了支持多种语言,需要额外写一份资源文件。

新建一个和values目录同级的values-zh的文件夹,将里面strings的值都写成中文

比如,原来是这样

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">MyFirstApp</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="edit_message">Entry a message</string>
    <string name="button_send">Send</string>
    <string name="title_activity_display_message">DisplayMessageActivity</string>
    <string name="action_search">Search</string>

</resources>

 修改后成这样

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">我的应用</string>
    <string name="action_settings">设置</string>
    <string name="hello_world">你好,世界</string>
    <string name="edit_message">输入一个消息</string>
    <string name="button_send">发送</string>
    <string name="title_activity_display_message">显示消息</string>
    <string name="action_search">查询</string>

</resources>

 图片国际化,类似。

 

二、支持不同的屏幕分辨率

为了支持不同屏幕的分辨率,首先要创建不同的layout ,和资源文件差不多,也是在相同目录下新建不同的文件夹,如layout ,layout-large,layout-land ....

然后创建不同的位图资源,其实在创建项目的时候Eclipse已经为我们创建了,如

drawable-hdpi,drawable-ldpi,drawable-mdpi ....

 

三、支持不同平台

1. SDK

在创建项目的时候就有最小支持SDK版本,和目标SDK版本,项目创建好后在清单文件AndroidManifest.xml中<uses-sdk>里有相应的设置

2.在运行时检查系统版本

 

private void setUpActionBar() {
    // Make sure we're running on Honeycomb or higher to use ActionBar APIs
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        ActionBar actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
    }
}

 3. 使用样式和主题

//To make your activity look like a dialog box:

<activity android:theme="@android:style/Theme.Dialog">

//To make your activity have a transparent background:

<activity android:theme="@android:style/Theme.Translucent">

//To apply your own custom theme defined in /res/values/styles.xml:

<activity android:theme="@style/CustomTheme">

//To apply a theme to your entire app (all activities), add the android:theme //attribute to the <application> element:

<application android:theme="@style/CustomTheme">

 很简单吧

 

 

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