Android實(shí)現(xiàn)讀取掃碼槍內(nèi)容(條形碼)

更新時(shí)間：2021年09月28日 14:38:58 作者：小鷹信息技術(shù)服務(wù)部

這篇文章主要為大家詳細(xì)介紹了Android實(shí)現(xiàn)讀取掃碼槍內(nèi)容、條形碼，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

近期有個(gè)需求，安卓設(shè)備外接掃碼槍，系統(tǒng)讀取掃碼槍掃描的內(nèi)容。

網(wǎng)上查了一些例子，拿過來用的時(shí)候都不太好使，最后沒辦法，自己實(shí)現(xiàn)了一個(gè)（目前只支持英文字母和英文符號）。

代碼如下：

1. 重寫Activity的onKeyDown方法，收集掃碼槍返回的keycode。

ArrayList<Integer> scannedCodes = new ArrayList<Integer>();
 
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
 
 if(keyCode!= KeyEvent.KEYCODE_ENTER){ //掃碼槍以回車為結(jié)束
  scannedCodes.add(keyCode);
 }else{ //結(jié)束
  handleKeyCodes();
 }
  
 return super.onKeyDown(keyCode, event);
}

2. 處理接收倒的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轉(zhuǎn)換為字符的方法

/** keyCode轉(zhuǎn)換為字符 */
public String keyCodeToChar(int code, boolean isShift){
 switch(code){
  
  case KeyEvent.KEYCODE_SHIFT_LEFT: return "";
  
  //數(shù)字鍵10個(gè) + 符號10個(gè)
  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";
  
  //字母鍵26個(gè)小寫 + 26個(gè)大寫
  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";
  
  //符號鍵11個(gè) + 11個(gè)
  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：