禁用鼠标光标不活动隐藏

想通了。

要查找的文件是:

frameworks/base/services/input/PointerController.cpp

The file on AndroidXRef

第39行定义了非活动超时(Android 4.2.2):

static const nsecs_t INACTIVITY_TIMEOUT_DELAY_TIME_NORMAL = 15 * 1000 * 1000000LL; // 15 seconds

用于淡化光标的方法:

void PointerController::fade(Transition transition) {
    AutoMutex _l(mLock);

    // Remove the inactivity timeout, since we are fading now.
    removeInactivityTimeoutLocked();

    // Start fading.
    if (transition == TRANSITION_IMMEDIATE) {
        mLocked.pointerFadeDirection = 0;
        mLocked.pointerAlpha = 0.0f;
        updatePointerLocked();
    } else {
        mLocked.pointerFadeDirection = -1;
        startAnimationLocked();
    }
}

注释了方法中的所有内容,但以下内容除外:

removeInactivityTimeoutLocked();

因为当不使用非活动超时时,在后台运行它是没有意义的。