好用的工具-MimeTypeMap

好用的工具--MimeTypeMap

Returns the file extension or an empty string iff there is no extension.                                                                               
String
getMimeTypeFromExtension(String extension)
Return the MIME type for the given extension.                                                                               
static MimeTypeMap
getSingleton()
Get the singleton instance of MimeTypeMap.                                                                               
boolean         hasExtension(String extension)
Return true if the given extension has a registered MIME type.                                                                               
boolean         hasMimeType(String mimeType)
Return true if the given MIME type has an entry in the map.                                                                               

MimeTypeMap类是单例模式的，既没有公有的构造方法。使用getSinglton()方法获得MimeTypeMap对象：
       MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();


示例：

public class MainActivity extends Activity {
        private String tag = "MainActivity";
       
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        System.out.println(111);
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
       
        //MimeTypeMap中是否有txt的MimeType
        System.out.println(mimeTypeMap.hasExtension("txt"));
       
        System.out.println(mimeTypeMap.hasMimeType("text/html"));
        //获得txt文件类型的MimeType
        String extension = mimeTypeMap.getMimeTypeFromExtension("txt");
        System.out.println(extension);
    }
}