Android实现读取扫码枪内容(条形码) Android实现读取扫码枪内容(条形

近期有个需求，安卓设备外接扫码枪，系统读取扫码枪扫描的内容。
网上查了一些例子，拿过来用的时候都不太好使，最后没办法，自己实现了一个（目前只支持英文字母和英文符号）。
代码如下：
1. 重写Activity的onKeyDown方法，收集扫码枪返回的keycode。

ArrayList scannedCodes = new ArrayList(); @Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode!= KeyEvent.KEYCODE_ENTER){ //扫码枪以回车为结束scannedCodes.add(keyCode); }else{ //结束handleKeyCodes(); } return super.onKeyDown(keyCode, event); }

2. 处理接收倒的keycode，handleKeyCodes()方法。

private void handleKeyCodes(){ FnString fnString = new FnString(); String result = ""; boolean hasShift = false; for(int keyCode : scannedCodes){result += fnString.keyCodeToChar(keyCode, hasShift); hasShift = (keyCode == KeyEvent.KEYCODE_SHIFT_LEFT); } Toast.makeText(context, result, Toast.LENGTH_LONG).show(); scannedCodes.clear(); }

3. keycode转换为字符的方法

/** keyCode转换为字符 */public String keyCodeToChar(int code, boolean isShift){ switch(code){case KeyEvent.KEYCODE_SHIFT_LEFT: return ""; //数字键10个 + 符号10个case KeyEvent.KEYCODE_0: return isShift ? ")" : "0"; case KeyEvent.KEYCODE_1: return isShift ? "!" : "1"; case KeyEvent.KEYCODE_2: return isShift ? "@" : "2"; case KeyEvent.KEYCODE_3: return isShift ? "#" : "3"; case KeyEvent.KEYCODE_4: return isShift ? "$" : "4"; case KeyEvent.KEYCODE_5: return isShift ? "%" : "5"; case KeyEvent.KEYCODE_6: return isShift ? "^" : "6"; case KeyEvent.KEYCODE_7: return isShift ? "&" : "7"; case KeyEvent.KEYCODE_8: return isShift ? "*" : "8"; case KeyEvent.KEYCODE_9: return isShift ? "(" : "9"; //字母键26个小写 + 26个大写case KeyEvent.KEYCODE_A: return isShift ? "A" : "a"; case KeyEvent.KEYCODE_B: return isShift ? "B" : "b"; case KeyEvent.KEYCODE_C: return isShift ? "C" : "c"; case KeyEvent.KEYCODE_D: return isShift ? "D" : "d"; case KeyEvent.KEYCODE_E: return isShift ? "E" : "e"; case KeyEvent.KEYCODE_F: return isShift ? "F" : "f"; case KeyEvent.KEYCODE_G: return isShift ? "G" : "g"; case KeyEvent.KEYCODE_H: return isShift ? "H" : "h"; case KeyEvent.KEYCODE_I: return isShift ? "I" : "i"; case KeyEvent.KEYCODE_J: return isShift ? "J" : "j"; case KeyEvent.KEYCODE_K: return isShift ? "K" : "k"; case KeyEvent.KEYCODE_L: return isShift ? "L" : "l"; case KeyEvent.KEYCODE_M: return isShift ? "M" : "m"; case KeyEvent.KEYCODE_N: return isShift ? "N" : "n"; case KeyEvent.KEYCODE_O: return isShift ? "O" : "o"; case KeyEvent.KEYCODE_P: return isShift ? "P" : "p"; case KeyEvent.KEYCODE_Q: return isShift ? "Q" : "q"; case KeyEvent.KEYCODE_R: return isShift ? "R" : "r"; case KeyEvent.KEYCODE_S: return isShift ? "S" : "s"; case KeyEvent.KEYCODE_T: return isShift ? "T" : "t"; case KeyEvent.KEYCODE_U: return isShift ? "U" : "u"; case KeyEvent.KEYCODE_V: return isShift ? "V" : "v"; case KeyEvent.KEYCODE_W: return isShift ? "W" : "w"; case KeyEvent.KEYCODE_X: return isShift ? "X" : "x"; case KeyEvent.KEYCODE_Y: return isShift ? "Y" : "y"; case KeyEvent.KEYCODE_Z: return isShift ? "Z" : "z"; //符号键11个 + 11个case KeyEvent.KEYCODE_COMMA: return isShift ? "<" : ","; case KeyEvent.KEYCODE_PERIOD: return isShift ? ">" : "."; case KeyEvent.KEYCODE_SLASH: return isShift ? "?" : "/"; case KeyEvent.KEYCODE_BACKSLASH: return isShift ? "|" : "\\"; case KeyEvent.KEYCODE_APOSTROPHE: return isShift ? "\"" : "'"; case KeyEvent.KEYCODE_SEMICOLON: return isShift ? ":" : "; "; case KeyEvent.KEYCODE_LEFT_BRACKET: return isShift ? "{" : "["; case KeyEvent.KEYCODE_RIGHT_BRACKET: return isShift ? "}" : "]"; case KeyEvent.KEYCODE_GRAVE: return isShift ? "~" : "`"; case KeyEvent.KEYCODE_EQUALS: return isShift ? "+" : "="; case KeyEvent.KEYCODE_MINUS: return isShift ? "_" : "-"; default: return "?"; }}

效果1：