Android4.0以后添加虚拟按键方法

public void sendKeySync(KeyEvent event) {

        long downTime = event.getDownTime();
        long eventTime = event.getEventTime();
        int action = event.getAction();
        int code = event.getKeyCode();
        int repeatCount = event.getRepeatCount();
        int metaState = event.getMetaState();
        int deviceId = event.getDeviceId();
        int scancode = event.getScanCode();
        int source = event.getSource();
        int flags = event.getFlags();
        if (source == InputDevice.SOURCE_UNKNOWN) {
            source = InputDevice.SOURCE_KEYBOARD;
        }
        if (eventTime == 0) {
            eventTime = SystemClock.uptimeMillis();
        }
        if (downTime == 0) {
            downTime = eventTime;
        }
        KeyEvent newEvent = new KeyEvent(downTime, eventTime, action, code, repeatCount, metaState,
                deviceId, scancode, flags | KeyEvent.FLAG_FROM_SYSTEM, source);
        InputManager.getInstance().injectInputEvent(newEvent,
                InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH);
    }
    
    /**
     * Sends an up and down key event sync to the currently focused window.
     * 
     * @param key The integer keycode for the event.
     */
    public void sendKeyDownUpSync(int key) {        
        sendKeySync(new KeyEvent(KeyEvent.ACTION_DOWN, key));
        sendKeySync(new KeyEvent(KeyEvent.ACTION_UP, key));
    }

需要系统权限才能使用