Android添加一个新的按键Key

1、首先先在对应的kl文件中添加新按键的键值以及它对应的Keycode

android/frameworks/base/core/res/res/values/Vendor_0f30_Product_0008.kl

注意：0f30是该Input设备的VID，0008是设备的PID

key 88    BUTTON_A
key 87    MENU              WAKE_DROPPED
key 68 	  SEARCH
key 67    EXPLORER
# EHK help key
key 66 	  DATASHEET
# EHK abc key
key 65 	  DICTIONARY

我们添加了两个按键key 65 和key 66，66和65这两个值是通过getevent命令打印转成十进制后的值

DATASHEET和DICTIONARY是我们自己定义的androidKeycode

2、在android Keycodes数组中加入我们新增加的keycode

a. android/frameworks/native/include/android/keycodes.h

    AKEYCODE_MEDIA_AUDIO_TRACK = 222,
	AKEYCODE_CAPTURE = 223,
    AKEYCODE_DATASHEET = 224,	// EHK HELP KEY
    AKEYCODE_DICTIONARY = 225,

b.android/frameworks/native/include/input/KeycodeLabels.h

	{ "CAPTURE", 222 },
    { "DATASHEET", 224 },	// EHK HELP KEY
    { "DICTIONARY", 225 },

c. android/frameworks/base/core/java/android/view/KeyEvent.java

        names.append(KEYCODE_CAPTURE, "KEYCODE_CAPTURE");
        names.append(KEYCODE_DATASHEET, "KEYCODE_DATASHEET");	// EHK help key
        names.append(KEYCODE_DICTIONARY, "KEYCODE_DICTIONARY");

d. android/frameworks/base/core/res/res/values/attrs.xml

3、android/frameworks/base/core/java/android/view/inputmethod/InputMethodManager.java

      这里添加按键响应的具体动作：

 public int dispatchInputEvent(InputEvent event, Object token,
            FinishedInputEventCallback callback, Handler handler) {
        synchronized (mH) {
            if (mCurMethod != null) {
                if (event instanceof KeyEvent) {
                    KeyEvent keyEvent = (KeyEvent)event;
                    if (keyEvent.getAction() == KeyEvent.ACTION_DOWN
                            && keyEvent.getKeyCode() == KeyEvent.KEYCODE_SYM
                            && keyEvent.getRepeatCount() == 0) {
                        //showInputMethodPickerLocked();
                        return DISPATCH_HANDLED;

                 } else if (keyEvent.getAction() == KeyEvent.ACTION_DOWN
                            && keyEvent.getKeyCode() == KeyEvent.KEYCODE_DATASHEET
                            && keyEvent.getRepeatCount() == 0) {
                                 Log.d(TAG,"zhanbing kbd button pressed");
                                 toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
                        return DISPATCH_HANDLED;
                        }

                }

                if (DEBUG) Log.v(TAG, "DISPATCH INPUT EVENT: " + mCurMethod);

                PendingEvent p = obtainPendingEventLocked(
                        event, token, mCurId, callback, handler);
                if (mMainLooper.isCurrentThread()) {
                    // Already running on the IMM thread so we can send the event immediately.
                    return sendInputEventOnMainLooperLocked(p);
                }

                // Post the event to the IMM thread.
                Message msg = mH.obtainMessage(MSG_SEND_INPUT_EVENT, p);
                msg.setAsynchronous(true);
                mH.sendMessage(msg);
                return DISPATCH_IN_PROGRESS;
            }else{
                                Log.d(TAG, "inputMethod be killed???  mCurId=" + mCurId+ "mWaitForBinding= " + mWaitForBinding);
                                Log.d(TAG, "mCurMethod= " +mCurMethod);
                                if((event instanceof KeyEvent) &&mWaitForBinding && mCurId!=null){

                                        return DISPATCH_FORWARD;
                                }else if((mBindSequence==-1)&&(event instanceof KeyEvent) &&mCurId==null){
                                        //connection cleared
                                        return DISPATCH_FORWARD;
                                }
                }
        }