BT手柄按键失灵的问题（1）
最近遇到一个问题，某些2.4G Input设备（应该是扫描按键设备，还包括BT手柄），进入到某些Activity之后，返回/确定按键失效 。
蓝牙手柄上的X和B键是复用的，在输入的时候X按下发挥确认键的功能，B则被解析为返回键。
进入某些Activity之后，X键和B键失去了复用功能，不能被解析为确认和返回，此时蓝牙手柄除了上下左右，其他的键功能基本丧失。
1，从Kernel的打印来看，正常和异常的时候，上传的数据完全一样。
从getevent来跟踪，按下手柄的确定键，也就是说按次键会有两个键值上报。
/dev/input/event6: 0004 0004 000900b9
/dev/input/event6: 0004 0004 000900b8
/dev/input/event6: 0004 0004 00090004 //这3个是一个MSC事件，是scan（#define MSC_SCAN 0x04 ），这三个扫描键对应的键值是DPAD_CENTER
/dev/input/event6: 0001 0133 00000001 //这一个KEY类型的事件（#define EV_KEY 0x01 ），键值为BUTTON_X（#define BTN_X 0x133 ），Value为按下
/dev/input/event6: 0000 0000 00000000 //SYNC信号
/dev/input/event6: 0004 0004 000900b9
/dev/input/event6: 0004 0004 000900b8
/dev/input/event6: 0004 0004 00090004
/dev/input/event6: 0001 0133 00000000
/dev/input/event6: 0000 0000 00000000 //对应的是抬起
2，InputReader和InputDispatcher的打印对比：
只有的对应的eventTime 不一样，其它的参数一致。
正常的时候：
D/InputReader( 5681): BatchSize: 5 Count: 5
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b9 when=164199285971000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b8 when=164199285971000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x00090004 when=164199285971000
D/InputReader( 5681): Input event: device=7 type=0x0001 code=0x0133 value=0x00000001 when=164199285971000
E/InputReader( 5681): >>>koffu,key dwon,keyDownIndex = -1 , policyFlags = 0
E/InputReader( 5681): ,metaStateChanged = 0
D/InputReader( 5681): Input event: device=7 type=0x0000 code=0x0000 value=0x00000000 when=164199285971000
D/InputDispatcher( 5681): notifyKey - eventTime=164199285971000, deviceId=7, source=0x501, policyFlags=0x0, action=0x0, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, downTime=164199285971000
D/InputDispatcher( 5681): dispatchKey - eventTime=164199285971000, deviceId=7, source=0x501, policyFlags=0x42000000, action=0x0, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, repeatCount=0, downTime=164199285971000
D/InputReader( 5681): BatchSize: 5 Count: 5
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b9 when=164199465804000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b8 when=164199465804000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x00090004 when=164199465804000
D/InputReader( 5681): Input event: device=7 type=0x0001 code=0x0133 value=0x00000000 when=164199465804000
E/InputReader( 5681): >>>koffu,key up,keyDownIndex = 0
E/InputReader( 5681): ,metaStateChanged = 0
D/InputReader( 5681): Input event: device=7 type=0x0000 code=0x0000 value=0x00000000 when=164199465804000
D/InputDispatcher( 5681): notifyKey - eventTime=164199465804000, deviceId=7, source=0x501, policyFlags=0x0, action=0x1, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, downTime=164199285971000
D/InputDispatcher( 5681): dispatchKey - eventTime=164199465804000, deviceId=7, source=0x501, policyFlags=0x42000000, action=0x1, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, repeatCount=0, downTime=16419928597100
不正常的时候:
D/InputReader( 5681): BatchSize: 5 Count: 5
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b9 when=164463524127000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b8 when=164463524127000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x00090004 when=164463524127000
D/InputReader( 5681): Input event: device=7 type=0x0001 code=0x0133 value=0x00000001 when=164463524127000
E/InputReader( 5681): >>>koffu,key dwon,keyDownIndex = -1 , policyFlags = 0
E/InputReader( 5681): ,metaStateChanged = 0
D/InputReader( 5681): Input event: device=7 type=0x0000 code=0x0000 value=0x00000000 when=164463524127000
D/InputDispatcher( 5681): notifyKey - eventTime=164463524127000, deviceId=7, source=0x501, policyFlags=0x0, action=0x0, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, downTime=164463524127000
D/InputDispatcher( 5681): dispatchKey - eventTime=164463524127000, deviceId=7, source=0x501, policyFlags=0x42000000, action=0x0, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, repeatCount=0, downTime=164463524127000
D/InputReader( 5681): BatchSize: 5 Count: 5
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b9 when=164463749112000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x000900b8 when=164463749112000
D/InputReader( 5681): Input event: device=7 type=0x0004 code=0x0004 value=0x00090004 when=164463749112000
D/InputReader( 5681): Input event: device=7 type=0x0001 code=0x0133 value=0x00000000 when=164463749112000
E/InputReader( 5681): >>>koffu,key up,keyDownIndex = 0
E/InputReader( 5681): ,metaStateChanged = 0
D/InputReader( 5681): Input event: device=7 type=0x0000 code=0x0000 value=0x00000000 when=164463749112000
D/InputDispatcher( 5681): notifyKey - eventTime=164463749112000, deviceId=7, source=0x501, policyFlags=0x0, action=0x1, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, downTime=164463524127000
D/InputDispatcher( 5681): dispatchKey - eventTime=164463749112000, deviceId=7, source=0x501, policyFlags=0x42000000, action=0x1, flags=0x8, keyCode=0x63, scanCode=0x133, metaState=0x0, repeatCount=0, downTime=16446352412700
3，在ViewRootImpl的打印：
这是出错时候的确定键（只报一个值，而且是BUTTON_X，所以确定键没有作用）
I/System.out( 7044): >>>koffu processImmediately = true
V/ViewRootImpl( 7044): Sending input event to IME: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_BUTTON_X, scanCode=307, metaState=0, flags=0x8, repeatCount=0, eventTime=165753574, downTime=165753574, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 99, realAction: false
I/System.out( 7044): >>>koffu processImmediately = true
V/ViewRootImpl( 7044): Sending input event to IME: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_BUTTON_X, scanCode=307, metaState=0, flags=0x8, repeatCount=0, eventTime=165753754, downTime=165753574, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 99, realAction: true
这是正常时候的按确定键（报两个值（BUTTON_X和DPAD_CENTER) 正常）
I/System.out( 7791): >>>koffu processImmediately = true
V/ViewRootImpl( 7791): Sending input event to IME: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_BUTTON_X, scanCode=307, metaState=0, flags=0x8, repeatCount=0, eventTime=168524925, downTime=168524925, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 99, realAction: false
I/System.out( 7791): >>>koffu processImmediately = false
V/ViewRootImpl( 7791): Sending input event to IME: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_DPAD_CENTER, scanCode=307, metaState=0, flags=0x408, repeatCount=0, eventTime=168524925, downTime=168524925, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 23, realAction: false
I/System.out( 7791): >>>koffu processImmediately = true
V/ViewRootImpl( 7791): Sending input event to IME: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_BUTTON_X, scanCode=307, metaState=0, flags=0x8, repeatCount=0, eventTime=168525183, downTime=168524925, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 99, realAction: true
I/System.out( 7791): >>>koffu processImmediately = false
V/ViewRootImpl( 7791): Sending input event to IME: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_DPAD_CENTER, scanCode=307, metaState=0, flags=0x408, repeatCount=0, eventTime=168525183, downTime=168524925, deviceId=7, source=0x501 }
D/RemoteIME( 6847): keycode: 23, realAction: true
思路：
1，这种蓝牙输入设备在其它Activity里面切换都能正常。但唯独进入某些Activity界面才触发确定键无效。是不是和某些Activity的一些Layout属性有关？
2，但使用IR遥控器又不会出问题。IR遥控器（EV_KEY）和蓝牙手柄输入设备（EV_MSC和EV_KEY）的类型不一样。
solution:
通过修改对应的kl文件，把两个键值全部解析为需要的功能键。
比如，当按下确定按键之后，把BUTTON_X的值也指向DPAD_CENTER.