对于dumpsys media.camera 这个命令，我们估计会比较熟悉也用的比较多。今天来看下同样是和media.camera相关的，adb shell cmd media.camera。
这个命令的实现是在framework层CameraService.cpp里面实现的。利用这个命令，比较实用的一点就是，可以在framework层dump到拍照生成的jpeg文件。当然，还有其它一些功能。
一、使用：adb shell cmd media.camera
//查看命令帮助adb shell cmd media.camera help//dump 拍照jpeg,同时需要setenforce 0,jpeg文件保存在/data/misc/cameraserver 下。adb shell cmd media.camera set-image-dump-mask 1
二、对应的代码逻辑
----- CameraService.cppstatus_t CameraService::printHelp(int out) {return dprintf(out, "Camera service commands:\n"" get-uid-state <PACKAGE> [--user USER_ID] gets the uid state\n"" set-uid-state <PACKAGE> <active|idle> [--user USER_ID] overrides the uid state\n"" reset-uid-state <PACKAGE> [--user USER_ID] clears the uid state override\n"" set-rotate-and-crop <ROTATION> overrides the rotate-and-crop value for AUTO backcompat\n"" Valid values 0=0 deg, 1=90 deg, 2=180 deg, 3=270 deg, 4=No override\n"" get-rotate-and-crop returns the current override rotate-and-crop value\n"" set-image-dump-mask <MASK> specifies the formats to be saved to disk\n"" Valid values 0=OFF, 1=ON for JPEG\n"" get-image-dump-mask returns the current image-dump-mask value\n"" set-camera-mute <0/1> enable or disable camera muting\n"" help print this message\n");}
status_t CameraService::shellCommand(int in, int out, int err, const Vector<String16>& args) {if (!checkCallingPermission(sManageCameraPermission, nullptr, nullptr)) {return PERMISSION_DENIED;}if (in == BAD_TYPE || out == BAD_TYPE || err == BAD_TYPE) {return BAD_VALUE;}if (args.size() >= 3 && args[0] == String16("set-uid-state")) {return handleSetUidState(args, err);} else if (args.size() >= 2 && args[0] == String16("reset-uid-state")) {return handleResetUidState(args, err);} else if (args.size() >= 2 && args[0] == String16("get-uid-state")) {return handleGetUidState(args, out, err);} else if (args.size() >= 2 && args[0] == String16("set-rotate-and-crop")) {return handleSetRotateAndCrop(args);} else if (args.size() >= 1 && args[0] == String16("get-rotate-and-crop")) {return handleGetRotateAndCrop(out);} else if (args.size() >= 2 && args[0] == String16("set-image-dump-mask")) {return handleSetImageDumpMask(args);} else if (args.size() >= 1 && args[0] == String16("get-image-dump-mask")) {return handleGetImageDumpMask(out);} else if (args.size() >= 2 && args[0] == String16("set-camera-mute")) {return handleSetCameraMute(args);} else if (args.size() == 1 && args[0] == String16("help")) {printHelp(out);return NO_ERROR;}
《Android Camera开发入门》、《Camx初认识》已经上架，可以点击了解 -> 小驰成长圈 ｜期待见证彼此的成长
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