【Android】Android Input

末蓝、 2022-02-03 04:06 257阅读 0赞

### 文章目录 ###

*  1、简介
 *  2、input命令
 *  3、hardware相关的java代码
 *  4、jni
 *  5、service相关的java代码
 *  6、libinputservice
 *  7、libandroid
 *  8、libinput
 *  9、InputFlinger
 *  10、evdev
 *  11、te

# 1、简介 #

本文简要介绍Android Input系统的目录结构，详细说明可参考：[https://blog.csdn.net/iEearth/article/details/86756978。][https_blog.csdn.net_iEearth_article_details_86756978]

# 2、input命令 #

input命令是adb shell中的一个命令行调试input的工具，详细说明可参考：[https://blog.csdn.net/iEearth/article/details/73555140。][https_blog.csdn.net_iEearth_article_details_73555140]

# 3、hardware相关的java代码 #

在目录frameworks/base/core/java/android/hardware/input中有一些hardware相关的java代码，如下所示。各文件的用途可以从文件名看出来，重要的是InputManger，上面提到的input命令就是通过InputManager的injectInputEvent注入input事件的。

frameworks/base/core/java/android/hardware/input
    ├── IInputDevicesChangedListener.aidl
    ├── IInputManager.aidl
    ├── InputDeviceIdentifier.aidl
    ├── InputDeviceIdentifier.java
    ├── InputManagerInternal.java
    ├── InputManager.java
    ├── ITabletModeChangedListener.aidl
    ├── KeyboardLayout.aidl
    ├── KeyboardLayout.java
    ├── TouchCalibration.aidl
    └── TouchCalibration.java

# 4、jni #

下面是input相关的jni文件，重点是com\_android\_server\_input\_InputManagerService.cpp中的NativeInputManager，是Java层InputManagerService与Native层InputManager沟通的桥梁。

frameworks/base/services/core/jni/com_android_server_input_InputWindowHandle.cpp
    frameworks/base/services/core/jni/com_android_server_input_InputApplicationHandle.h
    frameworks/base/services/core/jni/com_android_server_input_InputWindowHandle.h
    frameworks/base/services/core/jni/com_android_server_input_InputManagerService.cpp
    frameworks/base/services/core/jni/com_android_server_input_InputApplicationHandle.cpp

# 5、service相关的java代码 #

在目录frameworks/base/services/core/java/com/android/server/input中有一些service相关的java代码，如下所示。

frameworks/base/services/core/java/com/android/server/input
    ├── InputApplicationHandle.java
    ├── InputForwarder.java
    ├── InputManagerService.java
    ├── InputWindowHandle.java
    ├── OWNERS
    └── PersistentDataStore.java

# 6、libinputservice #

libinputservice用于光标控制，即Pointer、Sprinte，包括如下几个文件。

frameworks/base/libs/input
    ├── Android.bp
    ├── PointerController.cpp
    ├── PointerController.h
    ├── SpriteController.cpp
    └── SpriteController.h

# 7、libandroid #

libandroid中包括一个input相关的文件，把AInputEvent中的函数作了个简单的封装，如下所示。

frameworks/base/native/android/input.cpp
    int32_t AInputEvent_getType(const AInputEvent* event) {
        return static_cast<const InputEvent*>(event)->getType();
    }

# 8、libinput #

libinput包括如下几个文件，其中有一个很重要的InputTransport，定义了Input事件的传输机制，包括InputChannel、InputMessage、InputPublisher和InputConsumer四部分。InputMessage是Input事件传输的基本单元；InputChannel用于跨进程传输InputMessage；InputPublisher用于事件派发；InputConsumer用于事件接收。

frameworks/native/include/android/input.h
    frameworks/native/include/input
    ├── DisplayViewport.h
    ├── IInputFlinger.h
    ├── InputDevice.h
    ├── InputEventLabels.h
    ├── Input.h
    ├── InputTransport.h
    ├── Keyboard.h
    ├── KeyCharacterMap.h
    ├── KeyLayoutMap.h
    ├── VelocityControl.h
    ├── VelocityTracker.h
    └── VirtualKeyMap.h
    frameworks/native/libs/input
    ├── Android.bp
    ├── IInputFlinger.cpp
    ├── Input.cpp
    ├── InputDevice.cpp
    ├── InputTransport.cpp
    ├── Keyboard.cpp
    ├── KeyCharacterMap.cpp
    ├── KeyLayoutMap.cpp
    ├── VelocityControl.cpp
    ├── VelocityTracker.cpp
    └── VirtualKeyMap.cpp

# 9、InputFlinger #

InputFlinger是Android Native层Input相关的核心模块，简单来说就是InputReader从EventHub中读取Input事件，然后交由InputDispatcher进行事件派发。文件目录如下。

frameworks/native/services/inputflinger
    ├── Android.bp
    ├── EventHub.cpp
    ├── EventHub.h
    ├── host
    │   ├── Android.bp
    │   ├── InputDriver.cpp
    │   ├── InputDriver.h
    │   ├── InputFlinger.cpp
    │   ├── InputFlinger.h
    │   ├── inputflinger.rc
    │   ├── InputHost.cpp
    │   ├── InputHost.h
    │   └── main.cpp
    ├── InputApplication.cpp
    ├── InputApplication.h
    ├── InputDispatcher.cpp
    ├── InputDispatcher.h
    ├── InputListener.cpp
    ├── InputListener.h
    ├── InputManager.cpp
    ├── InputManager.h
    ├── InputReader.cpp
    ├── InputReader.h
    ├── InputWindow.cpp
    ├── InputWindow.h
    ├── PointerControllerInterface.h

# 10、evdev #

evdev、hal相关，目录结构如下。

hardware/libhardware/include/hardware/input.h
    hardware/libhardware/modules/input
    └── evdev
        ├── Android.bp
        ├── BitUtils.cpp
        ├── BitUtils.h
        ├── EvdevModule.cpp
        ├── InputDevice.cpp
        ├── InputDevice.h
        ├── InputDeviceManager.cpp
        ├── InputDeviceManager.h
        ├── InputHost.cpp
        ├── InputHost.h
        ├── InputHub.cpp
        ├── InputHub.h
        ├── InputMapper.cpp
        ├── InputMapper.h
        ├── MouseInputMapper.cpp
        ├── MouseInputMapper.h
        ├── SwitchInputMapper.cpp
        └── SwitchInputMapper.h

# 11、te #

安全相关，包括如下两个文件。

system/sepolicy/private/inputflinger.te
    system/sepolicy/public/inputflinger.te

[https_blog.csdn.net_iEearth_article_details_86756978]: https://blog.csdn.net/iEearth/article/details/86756978%E3%80%82
[https_blog.csdn.net_iEearth_article_details_73555140]: https://blog.csdn.net/iEearth/article/details/73555140%E3%80%82