理解Camera简单架构001

Android Camera框架

               从Android框架看，分为四层：应用层、应用框架层、库层、内核层。

          应用层主要工作在AndroidSDK之上，利用Android提供的API进行开发，生成APK包。

              Android的Camera包含取景器（viewfinder）和拍摄照片（takepicture）的功能。目前Android原生的Camera程序虽然功能比较简单，但是其程序的架构分成客户端和服务器两个部分，它们建立在Android的进程间通讯Binder的结构上。Android中的Camera模块同样遵循Android的框架。

Android Camera架构分层及代码结构

应用层

            Camera 的JAVA应用程序的路径：packages/apps/Camera/src/com/android/camera/

com.android.camera

                                      app

                                      crop

                                      data

                                      drawable

                                      exif

                                      gifencoder

                                      ui

                                      util

                                     

                                      CameraActivity.java

                                      AnimationManager.java

                                      CameraModule.java

                                      CameraMoreSetting.java

                                       CameraPreference.java

                                       CameraSetting.java

                                       PanoProgressBar.java

                                       PhotoMenu.java

                                       PhotoModule.java

                                       PhotoUI.java

                                       VideoMenu.java

                                       VideoModule.java

                                       VideoUI.java

                                       WideAnglePanoramaController.java

                                       WideAnglePanoramaModule.java

                                       WideAnglePanoramaUI.java

JNI层（Camera 的 JAVA 本地调用部分）：

           frameworks/base/core/java/android/hardware/Camera.java

JNI中定义的类是同一个，有些native方法通过JNI的方式调用Native代码实现具体的功能，比如startPreview、autoFocus、takePicture等。

Cameraclient层：

CameraService层

HAL层

三 Camera的架构和代码分析

头文件ICameraClient.h

头文件Camera.h