安卓Monkey测试屏蔽特殊按键

有时候我们需要屏蔽掉Monkey脚本的部分按键，先看看Monkey的key事件生成代码：

外部获取MonkeyEvent是通过development/cmds/monkey/src/com/android/commands/monkey/MonkeySourceRandom.java

里的getNextEvent()来获取的。

    /**
     * if the queue is empty, we generate events first
     * @return the first event in the queue
     */
    public MonkeyEvent getNextEvent() {
        if (mQ.isEmpty()) {
            generateEvents();
        }
        mEventCount++;
        MonkeyEvent e = mQ.getFirst();
        mQ.removeFirst();
        return e;
    }

 这里先判断队列MQ是否为空，如果为空，生成一个事件。获取队列头部的事件，然后返回。

     * generate a random event based on mFactor
     */
    private void generateEvents() {
        float cls = mRandom.nextFloat();
        int lastKey = 0;

        if (cls < mFactors[FACTOR_TOUCH]) {
            generatePointerEvent(mRandom, GESTURE_TAP);
            return;
        } else if (cls < mFactors[FACTOR_MOTION]) {
            generatePointerEvent(mRandom, GESTURE_DRAG);
            return;
        } else if (cls < mFactors[FACTOR_PINCHZOOM]) {
            generatePointerEvent(mRandom, GESTURE_PINCH_OR_ZOOM);
            return;
        } else if (cls < mFactors[FACTOR_TRACKBALL]) {
            generateTrackballEvent(mRandom);
            return;
        } else if (cls < mFactors[FACTOR_ROTATION]) {
            generateRotationEvent(mRandom);
            return;
        } else if (cls < mFactors[FACTOR_PERMISSION]) {
            mQ.add(mPermissionUtil.generateRandomPermissionEvent(mRandom));
            return;
        }

        // The remaining event categories are injected as key events
        for (;;) {
            if (cls < mFactors[FACTOR_NAV]) {
                lastKey = NAV_KEYS[mRandom.nextInt(NAV_KEYS.length)];
            } else if (cls < mFactors[FACTOR_MAJORNAV]) {
                lastKey = MAJOR_NAV_KEYS[mRandom.nextInt(MAJOR_NAV_KEYS.length)];
            } else if (cls < mFactors[FACTOR_SYSOPS]) {
                lastKey = SYS_KEYS[mRandom.nextInt(SYS_KEYS.length)];
            } else if (cls < mFactors[FACTOR_APPSWITCH]) {
                MonkeyActivityEvent e = new MonkeyActivityEvent(mMainApps.get(
                        mRandom.nextInt(mMainApps.size())));
                mQ.addLast(e);
                return;
            } else if (cls < mFactors[FACTOR_FLIP]) {
                MonkeyFlipEvent e = new MonkeyFlipEvent(mKeyboardOpen);
                mKeyboardOpen = !mKeyboardOpen;
                mQ.addLast(e);
                return;
            } else {
                lastKey = 1 + mRandom.nextInt(KeyEvent.getMaxKeyCode() - 1);
            }

            if (lastKey != KeyEvent.KEYCODE_POWER
                    && lastKey != KeyEvent.KEYCODE_ENDCALL
                    && lastKey != KeyEvent.KEYCODE_SLEEP
                    && lastKey != KeyEvent.KEYCODE_SOFT_SLEEP
                    && PHYSICAL_KEY_EXISTS[lastKey]) {
                break;
            }
        }

        MonkeyKeyEvent e = new MonkeyKeyEvent(KeyEvent.ACTION_DOWN, lastKey);
        mQ.addLast(e);

        e = new MonkeyKeyEvent(KeyEvent.ACTION_UP, lastKey);
        mQ.addLast(e);
    }

这个generateEvents()是用来生成随机事件的，通过float类型的随机数cls，根据区间去生成触摸/拖动/缩放等动作事件。如果cls>=mFactors[FACTOR_PERMISSION])，则生成key事件。key事件也分好几个种类，如果生成的lastKey满足下面条件或者cls满足某些可以return的分支则中止，否则继续循环，直到生成合适的key事件。

            if (lastKey != KeyEvent.KEYCODE_POWER
                    && lastKey != KeyEvent.KEYCODE_ENDCALL
                    && lastKey != KeyEvent.KEYCODE_SLEEP
                    && lastKey != KeyEvent.KEYCODE_SOFT_SLEEP
                    && PHYSICAL_KEY_EXISTS[lastKey]) {
                break;
            }

如果我们要屏蔽某些特殊按键，就直接在上面的if()条件中加入lastKey!= xxx就可以屏蔽掉想要屏蔽的按键了。