黑莓手機中的字符串模式匹配

Question

黑莓OS 6.0中我如何做一個簡單的模式匹配。其目的是檢查進入到用戶名編輯字段的用戶名是否包含特殊字符.... plz幫助我
感謝jibysthomas

Answer 1

一個更好的解決辦法是通過添加適當的TextFilter來控制用戶輸入您的編輯字段。這還具有修改屏幕鍵盤的額外好處，以便與裝備如此的設備上的過濾器相匹配。

這裏是結合兩個內置的文本過濾器，使一個只允許上字母和數字的操作爲例：

import net.rim.device.api.ui.text.TextFilter; 
import net.rim.device.api.system.Characters; 

/** 
* A TextFilter class to filter for station identifiers 
*/ 
private static class StationFilter extends TextFilter { 

// Order of the supporting filters is important, NUMERIC will convert 
// letters to numbers if it gets them first. 
private static TextFilter[]  _tf = { 
    TextFilter.get(TextFilter.NUMERIC), 
    TextFilter.get(TextFilter.UPPERCASE) 
}; 

// Convert using the first supporting filter that has a conversion 
public char convert(char character, int status) { 
    char c = 0; 

    for (int i = _tf.length - 1; i >= 0; i--) { 
    c = _tf[i].convert(character, status); 
    if (c != 0) { 
    return c; 
    } 
    } 

    return 0; 
} 

// Validate a space for separator, then by supporting filter 
public boolean validate(char character) { 
    if (character == Characters.SPACE) { 
    return true; 
    } 

    for (int i = _tf.length - 1; i >= 0; i--) { 
    boolean b = _tf[i].validate(character); 
    if (b) { 
    return true; 
    } 
    } 

    return false; 
} 
}