Mobile Phone development actual combat 48--Mobile Input Method Introduction 1

Input Method

Introduction

There are generally two types of information input methods used in mobile phone platforms: handwriting input and keyboard input. Handwriting technology is the traditional way of information input, the current handwriting input method recognition rate is not high. Mobile phone keyboard can be divided into general keyboard and QWERTY full-size keyboard. The biggest difference between a QWERTY full-size keyboard and a keyboard is that each letter occupies a key. Theoretically, it is faster to enter information than the normal keyboard.

At present, the general keyboard phone is in the mainstream, so the main introduction of this type of mobile phone input. All kinds of input methods are basic to comply with the "European Telecommunication Standards Committee ETSI" definition of the Keypad letter mapping Specification ETSI 202 130.

Enter the character, the first to call the input method engine to get the candidate characters or candidates required by the user. Candidate characters refers to the majority of Asian language, such as the number of Chinese, Japanese, Korean, etc., the candidate is often not through the input method engine directly, but through the corresponding characters, for example, for Chinese simplified, to obtain the pinyin or strokes, and then through them to obtain candidate Chinese characters, here the pinyin or stroke is a character. For the European language, its word selection process is much simpler, directly through the Input method key value can be.

The state of the key press and release two states, the key mode usually has normal, repeat and long three ways, such as Enter the letter B, it is necessary to press two times "2" key, that is, repeat way, you can also define a long way to repeat, such as long Time Press "2" key, The display a-b-c-2 will be switched continuously. Within the program, it is possible to determine the user's key mode by different timers, judging the time interval between press and release.

For touch-operated phones, consider the design of a virtual keyboard.

Platform manufacturers and mobile phone manufacturers do not develop input methods, mainly integrated input method providers to provide input methods.

Previously widely used on the phone input method is Zi and T9, now Zi Company was acquired, only T9. There are many input method suppliers in China, but many foreign customers specify the use of T9 input method, when doing overseas projects, to take this into account.

There are several ways to determine the performance of an input method:

1 Search and display the speed and number of candidate words from the font

2 intelligent Lenovo function, such as input "steam", will automatically display in the candidate word "car"

3 Number of keystrokes to select candidate characters

4 number of keystrokes for input characters

4 Candidate Word Intelligent adjustment function, that is, by the use of the word frequency, put characters commonly used in the forefront of candidates

5 Input phrase function