由IntentACTION_DOCK_EVENT(亮度传感器)引发的血案

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1、由Intent.ACTION_DOCK_EVENT（亮度传感器）引发的血案 在调试光感传感器（android2.2）发现，传递过来的lightvalue值是驱动值，但是实现的亮度变到最亮后却没有改变，查看代码发现如下问题 1：mIsDocked何时改变powerManagerService.java（framwork/base/services/java/com/android/server/）    lightSensorChangedLocked(){                        .........      

2、          intlcdValue=getAutoBrightnessValue(                        //(mIsDocked?value:mHighestLightSensorValue), //因为这里mIsDocked的缘故                        value,                        mLcdBacklightValues);                        }  privatevoiddockStateChanged(intsta

3、te){         synchronized(mLocks){                        //在这里改变的            mIsDocked=(state!=Intent.EXTRA_DOCK_STATE_UNDOCKED);            if(mIsDocked){                mHighestLightSensorValue=-1;            }            if((mPowerState&SCREEN_ON_BIT)!=0){         

4、       //forcelightsrecalculation                intvalue=(int)mLightSensorValue;                mLightSensorValue=-1;                lightSensorChangedLocked(value);            }        }  //在这里定义了一个receiver接受消息，接受EXTRA_DOCK_STATEprivatefinalclassDockReceiverextendsBr

5、oadcastReceiver{        @Override        publicvoidonReceive(Contextcontext,Intentintent){                         //获取EXTRA_DOCK_STATE的状态，并初始化为EXTRA_DOCK_STATE_UNDOCKED状态            intstate=intent.getIntExtra(Intent.EXTRA_DOCK_STATE,                    Intent.EXTRA_D

6、OCK_STATE_UNDOCKED);            dockStateChanged(state);        }    } voidinitInThread(){ .................  filter=newIntentFilter(); //定义一个filter        filter.addAction(Intent.ACTION_DOCK_EVENT);//向filter中添加Intent.ACTION_DOCK_EVENT消息        mContext.registerReceive

7、r(newDockReceiver(),filter);//将filter注册斤receiver中，这样DockReceiver就能接受含有ACTION_DOCK_EVENT的消息了 ......... } 2:Intent.ACTION_DOCK_EVENT何时发送      在DockObserver.java(frameworks/base/services/java/com/android/server/)中发送       //记住这个函数下面会用到   privatefinalvoidupdate(){        m

8、Handler.sendEmptyMessage(MSG_DOCK_STATE);    }    privatefinalHandlermHandler=newHandler(){        @Override        p