Android Training: 支持不同的设备

支持不同的语言

Good practice: Extract UI strings from app code and keep them in an external file
res/values/strings.xml
a hyphen and the ISO language code
Providing Alternative Resources

MyProject/
    res/
       values/
           strings.xml
       values-es/
           strings.xml
       values-fr/
           strings.xml

支持不同的屏幕

Two properties: size density
Four generalized sizes: small normal large xlarge
Four generalized densities: low(ldpi) medium(mdpi) high(hdpi) extra high(xhdpi)
Providing Resources
Designing for Multiple Screens

MyProject/
    res/
        layout/
            main.xml
        layout-large/
            main.xml

MyProject/
    res/
        layout/              # default (portrait)
            main.xml
        layout-land/         # landscape
            main.xml
        layout-large/        # large (portrait)
            main.xml
        layout-large-land/   # large landscape
            main.xml

创建不同的Bitmaps

xhdpi:2.0 hdpi:1.5 mdpi:1.0 ldpi:0.75

Iconography design guide

MyProject/
    res/
        drawable-xhdpi/
            awesomeimage.png
        drawable-hdpi/
            awesomeimage.png
        drawable-mdpi/
            awesomeimage.png
        drawable-ldpi/
            awesomeimage.png

支持不同的平台版本

Good practice: support about 90% of the active devices
Use Android Support Library

<manifest xmlns:android="http://schemas.android.com/apk/res/android" ... >
    <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="15" />
    ...
</manifest>

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);
    }
}

使用平台Styles和Themes

Styles and Themes