| 摘要 |
Electronic devices such as mobile telephones have the ability for a wide range of commands to be implemented via a number of keys. Because the number of keys is limited it is usually necessary to map more than one possible command to a particular key. For example, each command may be an instruction to a texting software application running on the mobile to insert a particular character into the text. Each key may be used to enter four characters. However, it is desirable to provide a capability to handle even greater number of characters per key in a convenient manner and this is achieved by providing different map levels where each level provides a set of characters to be “mapped” to the key. A command is provided at each level for the selection of another map level. Thus, by using this command, the key may be mapped to more characters in a very convenient manner.
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