输出一个字符每两个键在Android键盘

Question

我正在为Android中的阿姆哈拉语设计一个自定义键盘，但以下内容适用于许多其他非英语语言。

两个或多个键的组合可转换为一个字符。所以，如果用户输入'S'，键盘将输出' '…如果后面跟字母"A"，那么"就会被"代替。

我设法得到了一个解决方案，如下所示，通过在光标之前查看字符并根据Map检查它来工作。然而，我想知道是否有一个更简单、更干净的解决方案。

public void onKey(int primaryCode, int[] keyCodes) {
    InputConnection ic = getCurrentInputConnection();
    HashMap<String, Integer> en_to_am = new HashMap<String, Integer>();
    CharSequence pChar = ic.getTextBeforeCursor(1, 0);
    int outKey = 0;
    //build a hashmap of 'existing character' + 'new key code' = 'output key code'
    en_to_am.put("83", 4656);
    en_to_am.put("ሰ65", 4659);
    try {
        //see if config exists in hashmap for 'existing character' + 'new key code'
        if (en_to_am.get(pChar.toString() + primaryCode) != null) {
            outKey = en_to_am.get(pChar.toString() + primaryCode);
            ic.deleteSurroundingText(1, 0);
        } else {
            //else just translate latin to amharic (ASCII 83 = ሰ)
            if (en_to_am.get("" + primaryCode) != null) {
                outKey = en_to_am.get("" + primaryCode);
            } else {
                //if no translation exists, just output the latin code
                outKey = primaryCode;
            }
        }
    } catch (Exception e) {
        outKey = primaryCode;
    }
    char code = (char) outKey;
    ic.commitText(String.valueOf(code), 1);
}

Answer 1

我建议你做一些改变，让它更有效率

1. 使用您自己的变量来跟踪编辑状态。在下面的代码中，我使用了mcompositing，在starttinput时清除它，并在新输入时更新它。
2. 减少使用字符串。我已经使用自定义类替换了字符串，并重新构建了转换映射。
3. 使用组合文本给用户更好的提示你正在做什么。

下面是修改后的代码

private StringBuilder mComposing = new StringBuilder();
private static HashMap<Integer, CodeInfo> mCodeMap = new HashMap<Integer, CodeInfo>();
private static class CodeInfo {
   final Character mCode;
   final Map<Character, Character> mCombinedCharMap;
   CodeInfo(Character code, Map<Character, Character> combinedCharMap) {
       mCode = code;
       mCombinedCharMap = combinedCharMap;
   }
}
static {
    //reminder, do not input combinedCharMap as null
    mCodeMap.put(83, new CodeInfo(Character.valueOf((char)4656), new HashMap<Character, Character>());
    HashMap<Character, Character> combinedCharMap = new HashMap<Character, Character>();
    combinedCharMap.put(Character.valueOf('ሰ'), Character.valueOf((char)4659))
    mCodeMap.put(65, new CodeInfo(null, combinedCharMap);
}
@Override 
public void onStartInput(EditorInfo attribute, boolean restarting) {
    super.onStartInput(attribute, restarting);
    mComposing.setLength(0);

    //other codes you already have
}       
public void onKey(int primaryCode, int[] keyCodes) {
    InputConnection ic = getCurrentInputConnection();
    CodeInfo codeInfo = mCodeMap.get(primaryCode);
    Character output = null;
    if (codeInfo != null) {
        if (mComposing.length() > 0) {
            Character combinedOutput = codeInfo.mCombinedCharMap.get(mComposing.charAt(0));
            if (combinedOutput != null) {
                //the length is mComposing is expected to be 1 here
                mComposing.setCharAt(0, combinedOutput);
                ic.finishComposingText();
                ic.setComposingText(mComposing, 1);
                return;
            }
        }
        output = codeInfo.mCode;        
    }
    if (mComposing.length() > 0) {
       mComposing.setLength(0);
       ic.finishComposingText();
    }
    mComposing.append(output==null?(char)primaryCode:(char)output);
    ic.setComposingText(mComposing, 1);
}

Answer 2

在静态代码中初始化en_to_am

static private Map<String, Integer> en_to_am = new HashMap<String,Integer>;
static {
    //build a hashmap of 'existing character' + 'new key code' = 'output key code'
    en_to_am.put("83", 4656);
    en_to_am.put("ሰ65", 4659);
}

跳过try。

public void onKey(int primaryCode) {
    InputConnection ic = getCurrentInputConnection();
    CharSequence pChar = ic.getTextBeforeCursor(1, 0);
    Integer pairInt = en_to_am.get(pChar.toString() + primaryCode);
    Integer singleInt = en_to_am.get(primaryCode.toString());
    int outKey = primaryCode;
    if (pairInt != null) {
        try {
            ic.deleteSurroundingText(1, 0);
            outkey = pairInt;
        }
    }
    else if (singleInt != null) {
        outkey = singleInt;
    }
    ic.commitText((char) outkey).toString()), 1);
}