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Android Input子系统-含实例源码

發布時間：2023/12/20 Android 45 豆豆

生活随笔收集整理的這篇文章主要介紹了 Android Input子系统-含实例源码小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Android Input子系統-含實例源碼

1 Input子系統作用

Android很多外設都是用到輸入輸出設備，比如touchscreen，鍵盤，音量鍵等，輸入

設備對應Android 框架是Android?input子系統，像我們定制類比較多的，很多?
需要用到輸入子系統，比如一鍵打開相機，一鍵喚醒，實體按鍵等。

2 Android input子系統框架

Android Input框架講解最好的一篇文章?
https://blog.csdn.net/mmmccc000/article/details/49756059?
Android input框架主要分為三個部分，一個是kernel，一個是kl文件，kl也可?
以劃分為框架層，Framework層主要做監聽、過濾、分發的工作，Android App部?
分主要是接收Input子系統發上來的鍵值做對應的操作。

3 kernel input框架

Kernel主要是涉及Input設備節點的生成，proc文件系統的生成

有一個文章寫Kernel框架非常好的，我就不再講了，給幾個鏈接?
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添加一個新的鍵值

4.1 先在頭文件里面添加

找個共用的頭文件添加要的key值，正常是在include下面的，我的代碼是在這個位?
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對應的位置注冊和發送鍵值

注冊的位置

/*包含頭文件*/#include <linux/input.h>/*聲明input設備*/struct input_dev *button_dev;/*注冊input 子設備*/ 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;

發送鍵值的位置

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 寫一個對應這個kl文件

kl文件簡單介紹

Kl文件主要是起到了承上啟下的作用，kernel發過來的鍵值主要通過kl文件來映?
射，我們來看看kl文件里面的內容把。左邊的是對應kernel上報上來的鍵值，后?
面是對應Android Framework上的鍵值。

22 key 399 GRAVE23 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_UP

kl文件哪里來的呢

我們看項目配置下面，有很多kl文件，那么是每個input子系統對應一個kl文件，?
還是所有的項目共用一個kl文件？?
kl源碼位置在

./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 ...

在運行的設備里，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設備如何對應起來的呢

我們可以用這個命令來看看?cat /proc/bus/input/devices?
kl文件里面的vendor和product分別對應下面的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

添加我們對應的kl文件?
文件命名跟你申請的vendor和product對應上面的input設備對應的kl文件應該是：Vendor_0001_Product_0002.kl?
里面的內容如下，當然如果你沒有配置kl文件，默認會去Generic.kl找鍵值映?
射，如果里面也沒有，就會去其他kl文件繼續找。

# OnLive, Inc. OnLive Wireless Controller key 249 BUTTON_A

4.4 mtk平臺的一個input 子系統驅動例子

上面寫的是在rockchip平臺做的例子，下面給出一個mtk平臺的例子?
[mkt平臺的input子系統例子]?
(https://blog.csdn.net/weiqifa0/article/details/50387504)

5 Framework input系統介紹

Framework 主要做的事情是監聽底層的input，然后分發給上層?
下面的這個說的框架非常好，可以看看，我介紹完主要說明如何添加一個新的key?
到系統里面?
https://blog.csdn.net/wangkaiblog/article/details/12085183?
https://blog.csdn.net/mmmccc000/article/details/49756059

?

?

6 添加一個新的鍵值

主要涉及到幾個文件位置?
下面列出需要修改的文件還有修改的差異點?
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這里也可以根據驅動添加/?
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),

如果出現以下編譯錯誤

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. ******************************

提示你運行make update-api，但是要先回退current.txt 和system-current.txt，因為這兩個文件就是make update-api生成出來的

git checkout api/current.txt git checkout api/system-current.txt make update-api

關于make update-api詳細看這個https://blog.csdn.net/u010229714/article/details/73840014

如果需要調試，可以打開下面的調試文件

--- 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接收鍵值

主要參照這個鏈接來寫?
https://www.cnblogs.com/zhujiabin/p/5915802.html?
例程Android studio源碼?
鏈接：https://pan.baidu.com/s/1hzhQ-dLSRnAbg2Q8w5qKPw 密碼：944g

@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {if(event.getKeyCode() == KeyEvent.KEYCODE_ENTER){ /*隱藏軟鍵盤*/ 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 命令調試

8.1 測試上報時間

觸發Input上報的時間點

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 = 1643

APK接收到鍵值的時間點

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

消耗的時間大概需要16MS，但是觸發是通過HAL層觸發的，如果從Kerne觸發事間會更短一些

8.2 設備文件調試

我們kernel下面正常用 getevent 來調試?
getevent -l?
cat /proc/bus/input/devices

rk3399_mid:/ # getevent -l add device 1: /dev/input/event2name: "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 00000000

8.3 adb 上報鍵值調試

我們正常用adb shell input keyevent xx xx代表鍵值?
可以用input來觸發touchscreen也是可以的?
有個比較好的文章?
https://blog.csdn.net/jlminghui/article/details/39268419?
大部分支持的鍵值如下

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"

總結

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