用enum(枚举类型)取代整数集（Replacing integer sets with enum (enumeration type)）.doc

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用enum(枚举类型)取代整数集（Replacing integer sets with enum (enumeration type)）.doc

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用enum(枚举类型)取代整数集（Replacing integer sets with enum (enumeration type)） In the Android of API, you can find many places that use integer sets as parameters, so lets take a look at the examples. LinearLayout is known as a basic element of UI, which has the attributes of a direction, which can be set by the following methods: View plaincopy to clipboardprint? 01.LinearLayout.setOrientation (int); LinearLayout.setOrientation (int); its usually used when its used: View plaincopy to clipboardprint? 01.LinearLayout.setOrientation (LinearLayout.HORIZONTAL); 02.LinearLayout.setOrientation (LinearLayout.VERTICAL); LinearLayout.setOrientation (LinearLayout.HORIZONTAL); LinearLayout.setOrientation (LinearLayout.VERTICAL); but it can also be used like this: View plaincopy to clipboardprint? 01.LinearLayout.setOrientation (0); / / LinearLayout.HORIZONTAL = 0 02.LinearLayout.setOrientation (1); / / LinearLayout.VERTICAL = 0x01 LinearLayout.setOrientation (0); / / LinearLayout.HORIZONTAL = 0 LinearLayout.setOrientation (1); / / LinearLayout.VERTICAL = 0x01 or so: View plaincopy to clipboardprint? 01.LinearLayout.setOrientation (Integer.MAX_VALUE); 02.LinearLayout.setOrientation (Integer.MIN_VALUE); 03.LinearLayout.setOrientation (2012); LinearLayout.setOrientation (Integer.MAX_VALUE); LinearLayout.setOrientation (Integer.MIN_VALUE); LinearLayout.setOrientation (2012); since the parameter setOrientation receives is an integer, you can pass any legitimate integer - at least there is no problem in compiling. It will only at runtime may cause problems, but as you know, developers only pay attention to the procedure can be compiled successfully, as for the operation, it is the users concern, because developers do not necessarily use their developed program. In addition to this example, this API can be seen everywhere in Androids API, such as setting View visibility, setting Wifi status, and so on. They all define integers, and then use integers as arguments, and hope developers can pass