【攻克Android (7)】String格式化输出

[size=large]一、String格式化输出[/size]

[size=medium]1. 字符串资源[/size]

[size=medium]（1）String （字符串）[/size]

[size=medium]在 strings.xml 中定义：[/size]

<?xml version="1.0" encoding="utf-8"?>  
 <resources>  
     <string name="hello">Hello!</string>  
 </resources>

[size=medium]在布局文件中引用：[/size]

<TextView  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="@string/hello" />

[size=medium]在活动（Java类）中引用：[/size]

String string = getString(R.string.hello);

[size=medium]（2）String Array （字符串数组） [/size]

[size=medium]在 strings.xml 中定义：[/size]

<?xml version="1.0" encoding="utf-8"?>  
 <resources>  
     <string-array name="planets_array">  
         <item>Mercury</item>  
         <item>Venus</item>  
         <item>Earth</item>  
         <item>Mars</item>  
     </string-array>  
 </resources>

[size=medium]在活动（Java类）中引用：[/size]

Resources res = getResources();  
 String[] planets = res.getStringArray(R.array.planets_array);

[size=medium]（3）Quantity String(Plurals) （数量字符串/复数） [/size]

[size=medium]在 res/values/strings.xml 中定义：[/size]

<?xml version="1.0" encoding="utf-8"?>  
 <resources>  
     <plurals name="numberOfSongsAvailable">  
         <item quantity="one">One song found.</item>  
         <item quantity="other">%d songs found.</item>  
     </plurals>  
 </resources>

[size=medium]在 res/values-pl/strings.xml 中定义：[/size]

<?xml version="1.0" encoding="utf-8"?>  
 <resources>  
     <plurals name="numberOfSongsAvailable">  
         <item quantity="one">Znaleziono jedną piosenkę.</item>  
         <item quantity="few">Znaleziono %d piosenki.</item>  
         <item quantity="other">Znaleziono %d piosenek.</item>  
     </plurals>  
 </resources>

[size=medium]在活动（Java类）中引用：[/size]

int count = getNumberOfsongsAvailable();  
 Resources res = getResources();  
 String songsFound = res.getQuantityString(R.plurals.numberOfSongsAvailable, count, count);

[size=medium]2. String格式化输出[/size]

[size=medium]String.format("-----%s----%d", getString(R.string.hello_world), 200) [/size]

[size=medium]String.format("%f----%.2f", Math.PI, Math.PI) [/size]