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1 Input子系统作用
Android很多外设都是用到输入输出设备，比如touchscreen，键盘，音量键等，输入设备对应Android 框架是Android input子系统，像我们定制类比较多的，很多 需要用到输入子系统，比如一键打开相机，一键唤醒，实体按键等。
2 Android input子系统框架
Android Input框架讲解最好的一篇文章
https://blog.csdn.net/mmmccc000/article/details/49756059
Android input框架主要分为三个部分，一个是kernel，一个是kl文件，kl也可
以划分为框架层，Framework层主要做监听、过滤、分发的工作，Android App部
分主要是接收Input子系统发上来的键值做对应的操作。
3 kernel input框架
Kernel主要是涉及Input设备节点的生成，proc文件系统的生成
有一个文章写Kernel框架非常好的，我就不再讲了，给几个链接
https://blog.csdn.net/u013604527/article/details/53432623/
https://blog.csdn.net/jscese/article/details/42123673
https://blog.csdn.net/xubin341719/article/details/7881735
4 如何在kernel添加一个新的键值
4.1 先在头文件里面添加
找个共用的头文件添加要的key值，正常是在include下面的，我的代码是在这个位
置
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index 87cf351..45a33ab 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -335,7 +335,7 @@
#define KEY_RFKILL 247 /* Key that controls all radios */
#define KEY_MICMUTE 248 /* Mute / unmute the microphone */
-
+#define KEY_WEIQIFA_TEST 249
/* Code 255 is reserved for special needs of AT keyboard driver */
4.2 在kernel对应的位置注册和发送键值
注册的位置
/*包含头文件*/
#include <linux/input.h>
/*声明input设备*/
struct input_dev *button_dev;
/*注册input 子设备*/
printk(KERN_ERR " xxxx_wake_init\n");
if (!(button_dev= input_allocate_device()))
{
printk(KERN_ERR "input_dev: not enough memory\n");
return -ENOMEM;
}
button_dev->name = "xxxx";
button_dev->phys = "xxxx/event0";
button_dev->id.bustype = BUS_HOST;
button_dev->id.vendor = 0x0001;
button_dev->id.product = 0x0002;
button_dev->id.version = 0x0100;
button_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_SYN);
set_bit(KEY_WEIQIFA_TEST,button_dev->keybit);
err = input_register_device(button_dev);
if (err) {
printk(KERN_ERR " fail to input_register_device\n");
input_free_device(button_dev);
return err;
}
printk(KERN_ERR "xxxx_wake_init success!!!\n");
return 0;发送键值的位置
input_report_key(button_dev, KEY_WEIQIFA_TEST, 1);
input_sync(button_dev);
input_report_key(button_dev, KEY_WEIQIFA_TEST, 0);
input_sync(button_dev);4.3 写一个对应这个kl文件
kl文件简单介绍
Kl文件主要是起到了承上启下的作用，kernel发过来的键值主要通过kl文件来映
射，我们来看看kl文件里面的内容把。左边的是对应kernel上报上来的键值，后
面是对应Android Framework上的键值。
22 key 399 GRAVE
23 key 2 1
...
49 key 103 DPAD_UP
50 key 102 HOME
51 key 105 DPAD_LEFT
52 key 106 DPAD_RIGHT
53 key 115 VOLUME_UPkl文件哪里来的呢
我们看项目配置下面，有很多kl文件，那么是每个input子系统对应一个kl文件，
还是所有的项目共用一个kl文件？
kl源码位置在
./frameworks/base/data/keyboards/AVRCP.kl
./frameworks/base/data/keyboards/G
./frameworks/base/data/keyboards/Vendor_0079_Product_0011.kl
./frameworks/base/data/keyboards/Vendor_045e_Product_028e.kl
...在运行的设备里，它的位置如下
rk3399_mid:/ # busybox find / -iname *.kl
/system/usr/keylayout/Generic.kl
/system/usr/keylayout/Vendor_0079_Product_0011.kl
/system/usr/keylayout/qwerty.kl
/system/usr/keylayout/rk29-keypad.kl
/system/usr/keylayout/rtkbt_virtual_hid.kl
...
rk3399_mid:/ #kl是跟input设备如何对应起来的呢
我们可以用这个命令来看看 cat /proc/bus/input/devices
kl文件里面的vendor和product分别对应下面的vendor和product
rk3399_mid:/ # cat /proc/bus/input/devices
I: Bus=0019 Vendor=0001 Product=0002 Version=0100
N: Name="xxxx"
P: Phys=iflytek/event0
S: Sysfs=/devices/virtual/input/input0
U: Uniq=
H: Handlers=event0 cpufreq
B: PROP=0
B: EV=b
B: KEY=100000 0 0 0
B: ABS=0添加我们对应的kl文件
文件命名跟你申请的vendor和product对应 上面的input设备对应的kl文件应该是：Vendor_0001_Product_0002.kl
里面的内容如下，当然如果你没有配置kl文件，默认会去Generic.kl找键值映
射，如果里面也没有，就会去其他kl文件继续找。
# OnLive, Inc. OnLive Wireless Controller
key 249 BUTTON_A4.4 mtk平台的一个input 子系统驱动例子
上面写的是在rockchip平台做的例子，下面给出一个mtk平台的例子
[mkt平台的input子系统例子]
(https://blog.csdn.net/weiqifa0/article/details/50387504)
5 Framework input系统介绍
Framework 主要做的事情是监听底层的input，然后分发给上层
下面的这个说的框架非常好，可以看看，我介绍完主要说明如何添加一个新的key
到系统里面
https://blog.csdn.net/wangkaiblog/article/details/12085183
https://blog.csdn.net/mmmccc000/article/details/49756059
6 添加一个新的键值
主要涉及到几个文件位置
下面列出需要修改的文件还有修改的差异点
base/api/current.txt
base/api/system-current.txt
base/core/java/android/view/KeyEvent.java
base/core/res/res/values/attrs.xml
/Generic.kl这里也可以根据驱动添加/
base/data/keyboards/Generic.kl
base/policy/src/com/android/internal/policy/impl/PhoneFallbackEventHandler.java
native/include/android/keycodes.h
native/include/input/InputEventLabels.h
diff --git a/api/current.txt b/api/current.txt
index 63fa997..a7a4a2b 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -41599,6 +41599,7 @@ package android.view {
field public static final int KEYCODE_ASSIST = 219; // 0xdb
field public static final int KEYCODE_AT = 77; // 0x4d
field public static final int KEYCODE_AUDIO = 314; // 0x13a
+ field public static final int KEYCODE_WEIQIFA = 315; // 0x13B
field public static final int KEYCODE_AVR_INPUT = 182; // 0xb6
field public static final int KEYCODE_AVR_POWER = 181; // 0xb5
field public static final int KEYCODE_B = 30; // 0x1e
diff --git a/api/system-current.txt b/api/system-current.txt
index 19135aa..956ea3e 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -44781,6 +44781,7 @@ package android.view {
field public static final int KEYCODE_ASSIST = 219; // 0xdb
field public static final int KEYCODE_AT = 77; // 0x4d
field public static final int KEYCODE_AUDIO = 314; // 0x13a
+ field public static final int KEYCODE_WEIQIFA = 315; // 0x13b
field public static final int KEYCODE_AVR_INPUT = 182; // 0xb6
field public static final int KEYCODE_AVR_POWER = 181; // 0xb5
field public static final int KEYCODE_B = 30; // 0x1e
diff --git a/core/java/android/view/KeyEvent.java b/core/java/android/view/KeyEvent.java
index 056f2c9..f2d5235 100755
--- a/core/java/android/view/KeyEvent.java
+++ b/core/java/android/view/KeyEvent.java
@@ -832,6 +832,7 @@ public class KeyEvent extends InputEvent implements Parcelable {
public static final int KEYCODE_TV_MEDIA_PAUSE = 304;
public static final int KEYCODE_WLAN = 313;
public static final int KEYCODE_AUDIO = 314;
+ public static final int KEYCODE_WEIQIFA = 315;
//$_rbox_$_modify_$ end
private static final int LAST_KEYCODE = KEYCODE_TV_MEDIA_PAUSE;
diff --git a/core/java/com/android/internal/policy/PhoneFallbackEventHandler.java b/core/java/com/android/internal/policy/PhoneFallbackEventHandler.java
index e6635a1..366790c 100755
--- a/core/java/com/android/internal/policy/PhoneFallbackEventHandler.java
+++ b/core/java/com/android/internal/policy/PhoneFallbackEventHandler.java
@@ -141,7 +141,12 @@ public class PhoneFallbackEventHandler implements FallbackEventHandler {
}
case KeyEvent.KEYCODE_AUDIO: {
Log.i(TAG, "---KEYCODE_AUDIO DOWN---");
+
}
+ case KeyEvent.KEYCODE_WEIQIFA: {
+ Log.i(TAG,"KEYCODE_WEIQIFA");
+ }
+
case KeyEvent.KEYCODE_CAMERA: {
if (getKeyguardManager().inKeyguardRestrictedInputMode() || dispatcher == null) {
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 93743df..094e6c2 100755
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -1861,6 +1861,7 @@ i
<enum name="KEYCODE_MICMUTE" value="312" />
<enum name="KEYCODE_WLAN" value="313" />
<enum name="KEYCODE_AUDIO" value="314" />
+ <enum name="KEYCODE_WEIQIFA" value="315" />
</attr>
<!-- ***************************************************************** -->
diff --git a/include/android/keycodes.h b/include/android/keycodes.h
index e3586b2..b657424 100755
--- a/include/android/keycodes.h
+++ b/include/android/keycodes.h
@@ -777,6 +777,7 @@ enum {
AKEYCODE_MICMUTE = 312,
AKEYCODE_WLAN = 313,
AKEYCODE_AUDIO = 314
+ AKEYCODE_WEIQIFA = 315
// NOTE: If you add a new keycode here you must also add it to several other files.
// Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index fabf912..1cd69a2 100755
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -68,6 +68,7 @@ static const InputEventLabel KEYCODES[] = {
DEFINE_KEYCODE(POWER),
DEFINE_KEYCODE(WLAN),
DEFINE_KEYCODE(AUDIO),
+ DEFINE_KEYCODE(WEIQIFA),
DEFINE_KEYCODE(CAMERA),
DEFINE_KEYCODE(CLEAR),
DEFINE_KEYCODE(A),
如果出现以下编译错误
out/target/common/obj/PACKAGING/test-api.txt:41961: error 5: Added public field android.view.KeyEvent.KEYCODE_WEIQIFA
******************************
You have tried to change the API from what has been previously approved.
To make these errors go away, you have two choices:
1) You can add "@hide" javadoc comments to the methods, etc. listed in the
errors above.
2) You can update current.txt by executing the following command:
make update-api
To submit the revised current.txt to the main Android repository,
you will need approval.
******************************提示你运行make update-api，但是要先回退current.txt 和system-current.txt，因为这两个文件就是make update-api生成出来的
git checkout api/current.txt
git checkout api/system-current.txt
make update-api关于make update-api详细看这个https://blog.csdn.net/u010229714/article/details/73840014
如果需要调试，可以打开下面的调试文件
--- a/services/core/java/com/android/server/input/InputManagerService.java
+++ b/services/core/java/com/android/server/input/InputManagerService.java
@@ -125,7 +125,7 @@ import libcore.util.Objects;
public class InputManagerService extends IInputManager.Stub
implements Watchdog.Monitor {
static final String TAG = "InputManager";
- static final boolean DEBUG = false;
+ static final boolean DEBUG = true;
private static final String EXCLUDED_DEVICES_PATH = "etc/excluded-input-devices.xml";
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -172,7 +172,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
static final String TAG = "WindowManager";
static final boolean DEBUG = false;
static final boolean localLOGV = false;
- static final boolean DEBUG_INPUT = false;
+ static final boolean DEBUG_INPUT = true;
static final boolean DEBUG_KEYGUARD = false;
static final boolean DEBUG_LAYOUT = false;
static final boolean DEBUG_STARTING_WINDOW = false;
--- a/services/inputflinger/InputDispatcher.cpp
+++ b/services/inputflinger/InputDispatcher.cpp
@@ -17,31 +17,31 @@
#define LOG_TAG "InputDispatcher"
#define ATRACE_TAG ATRACE_TAG_INPUT
-//#define LOG_NDEBUG 0
+#define LOG_NDEBUG 1
// Log detailed debug messages about each inbound event notification to the dispatcher.
-#define DEBUG_INBOUND_EVENT_DETAILS 0
+#define DEBUG_INBOUND_EVENT_DETAILS 1
// Log detailed debug messages about each outbound event processed by the dispatcher.
-#define DEBUG_OUTBOUND_EVENT_DETAILS 0
+#define DEBUG_OUTBOUND_EVENT_DETAILS 1
// Log debug messages about the dispatch cycle.
-#define DEBUG_DISPATCH_CYCLE 0
+#define DEBUG_DISPATCH_CYCLE 1
// Log debug messages about registrations.
-#define DEBUG_REGISTRATION 0
+#define DEBUG_REGISTRATION 1
// Log debug messages about input event injection.
-#define DEBUG_INJECTION 0
+#define DEBUG_INJECTION 1
// Log debug messages about input focus tracking.
-#define DEBUG_FOCUS 0
+#define DEBUG_FOCUS 1
// Log debug messages about the app switch latency optimization.
-#define DEBUG_APP_SWITCH 0
+#define DEBUG_APP_SWITCH 1
// Log debug messages about hover events.
-#define DEBUG_HOVER 0
+#define DEBUG_HOVER 1
#include "InputDispatcher.h"
diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index c8dc454..3a622fc 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -16,10 +16,10 @@
#define LOG_TAG "InputReader"
-//#define LOG_NDEBUG 0
+#define LOG_NDEBUG 1
// Log debug messages for each raw event received from the EventHub.
-#define DEBUG_RAW_EVENTS 0
+#define DEBUG_RAW_EVENTS 1
// Log debug messages about touch screen filtering hacks.
#define DEBUG_HACKS 0
diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
index 2dff4e0..977aa22 100644
--- a/libs/input/InputTransport.cpp
+++ b/libs/input/InputTransport.cpp
@@ -5,19 +5,19 @@
//
#define LOG_TAG "InputTransport"
-//#define LOG_NDEBUG 0
+#define LOG_NDEBUG 1
// Log debug messages about channel messages (send message, receive message)
-#define DEBUG_CHANNEL_MESSAGES 0
+#define DEBUG_CHANNEL_MESSAGES 1
// Log debug messages whenever InputChannel objects are created/destroyed
-#define DEBUG_CHANNEL_LIFECYCLE 0
+#define DEBUG_CHANNEL_LIFECYCLE 1
// Log debug messages about transport actions
-#define DEBUG_TRANSPORT_ACTIONS 0
+#define DEBUG_TRANSPORT_ACTIONS 1
// Log debug messages about touch event resampling
-#define DEBUG_RESAMPLING 0
+#define DEBUG_RESAMPLING 1
7 App接收键值
主要参照这个链接来写
https://www.cnblogs.com/zhujiabin/p/5915802.html
例程Android studio源码
链接：https://pan.baidu.com/s/1hzhQ-dLSRnAbg2Q8w5qKPw 密码：944g
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if(event.getKeyCode() == KeyEvent.KEYCODE_ENTER){
/*隐藏软键盘*/
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if(inputMethodManager.isActive()){
inputMethodManager.hideSoftInputFromWindow(MainActivity.this.getCurrentFocus().getWindowToken(), 0);
}
edittext.setText("success");
webview.loadUrl(URL);
return true;
}
return super.dispatchKeyEvent(event);
}8 命令调试
8.1 测试上报时间
触发Input上报的时间点
rk3399_mid:/ $ logcat -s "CAE_LOG"|grep -E CAEIvwCb
09-06 14:10:13.502 327 436 D CAE_LOG : CAEIvwCb angle = 23 ,beam = 0 CMScore = 1643APK接收到键值的时间点
09-06 14:10:13.518 5693-5693/com.hu.audiotest D/audiotest_MainActivity: KeyEvent.KEYCODE_ENTER KeyCode0
09-06 14:10:13.522 5693-5693/com.hu.audiotest D/audiotest_MainActivity: KeyEvent.KEYCODE_ENTER KeyCode0消耗的时间大概需要16MS，但是触发是通过HAL层触发的，如果从Kerne触发事间会更短一些
8.2 设备文件调试
我们kernel下面正常用 getevent 来调试
getevent -l
cat /proc/bus/input/devices
rk3399_mid:/ # getevent -l
add device 1: /dev/input/event2
name: "rk29-keypad"
add device 2: /dev/input/event1
name: "as9102 Touchscreen"
add device 3: /dev/input/event0
name: "iflytek"
/dev/input/event0: EV_KEY 00f9 DOWN
/dev/input/event0: EV_SYN SYN_REPORT 00000000
/dev/input/event0: EV_KEY 00f9 UP
/dev/input/event0: EV_SYN SYN_REPORT 000000008.3 adb 上报键值调试
我们正常用adb shell input keyevent xx xx代表键值
可以用input来触发touchscreen也是可以的
有个比较好的文章
https://blog.csdn.net/jlminghui/article/details/39268419
大部分支持的键值如下
0 --> "KEYCODE_UNKNOWN"
1 --> "KEYCODE_MENU"
2 --> "KEYCODE_SOFT_RIGHT"
3 --> "KEYCODE_HOME"
4 --> "KEYCODE_BACK"
5 --> "KEYCODE_CALL"
6 --> "KEYCODE_ENDCALL"
7 --> "KEYCODE_0"
8 --> "KEYCODE_1"
9 --> "KEYCODE_2"
10 --> "KEYCODE_3"
11 --> "KEYCODE_4"
12 --> "KEYCODE_5"
13 --> "KEYCODE_6"
14 --> "KEYCODE_7"
15 --> "KEYCODE_8"
16 --> "KEYCODE_9"
17 --> "KEYCODE_STAR"
18 --> "KEYCODE_POUND"
19 --> "KEYCODE_DPAD_UP"
20 --> "KEYCODE_DPAD_DOWN"
21 --> "KEYCODE_DPAD_LEFT"
22 --> "KEYCODE_DPAD_RIGHT"
23 --> "KEYCODE_DPAD_CENTER"
24 --> "KEYCODE_VOLUME_UP"
25 --> "KEYCODE_VOLUME_DOWN"
26 --> "KEYCODE_POWER"
27 --> "KEYCODE_CAMERA"
28 --> "KEYCODE_CLEAR"
29 --> "KEYCODE_A"
30 --> "KEYCODE_B"
31 --> "KEYCODE_C"
32 --> "KEYCODE_D"
33 --> "KEYCODE_E"
34 --> "KEYCODE_F"
35 --> "KEYCODE_G"
36 --> "KEYCODE_H"
37 --> "KEYCODE_I"
38 --> "KEYCODE_J"
39 --> "KEYCODE_K"
40 --> "KEYCODE_L"
41 --> "KEYCODE_M"
42 --> "KEYCODE_N"
43 --> "KEYCODE_O"
44 --> "KEYCODE_P"
45 --> "KEYCODE_Q"
46 --> "KEYCODE_R"
47 --> "KEYCODE_S"
48 --> "KEYCODE_T"
49 --> "KEYCODE_U"
50 --> "KEYCODE_V"
51 --> "KEYCODE_W"
52 --> "KEYCODE_X"
53 --> "KEYCODE_Y"
54 --> "KEYCODE_Z"
55 --> "KEYCODE_COMMA"
56 --> "KEYCODE_PERIOD"
57 --> "KEYCODE_ALT_LEFT"
58 --> "KEYCODE_ALT_RIGHT"
59 --> "KEYCODE_SHIFT_LEFT"
60 --> "KEYCODE_SHIFT_RIGHT"
61 --> "KEYCODE_TAB"
62 --> "KEYCODE_SPACE"
63 --> "KEYCODE_SYM"
64 --> "KEYCODE_EXPLORER"
65 --> "KEYCODE_ENVELOPE"
66 --> "KEYCODE_ENTER"
67 --> "KEYCODE_DEL"
68 --> "KEYCODE_GRAVE"
69 --> "KEYCODE_MINUS"
70 --> "KEYCODE_EQUALS"
71 --> "KEYCODE_LEFT_BRACKET"
72 --> "KEYCODE_RIGHT_BRACKET"
73 --> "KEYCODE_BACKSLASH"
74 --> "KEYCODE_SEMICOLON"
75 --> "KEYCODE_APOSTROPHE"
76 --> "KEYCODE_SLASH"
77 --> "KEYCODE_AT"
78 --> "KEYCODE_NUM"
79 --> "KEYCODE_HEADSETHOOK"
80 --> "KEYCODE_FOCUS"
81 --> "KEYCODE_PLUS"
82 --> "KEYCODE_MENU"
83 --> "KEYCODE_NOTIFICATION"
84 --> "KEYCODE_SEARCH"
85 --> "TAG_LAST_KEYCODE"