commit message

.gitignore

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+*.exe
+*.pyc
+__pycache__
+.vscode

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.19041.0",
+            "compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.28.29910/bin/Hostx64/x64/cl.exe",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-msvc-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

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+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+
+        {
+            "name": "g++.exe - 生成和调试活动文件",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${fileDirname}\\${fileBasenameNoExtension}.exe",
+            "args": [],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "miDebuggerPath": "D:\\mingw\\mingw64\\bin\\gdb.exe",
+            "setupCommands": [
+                {
+                    "description": "为 gdb 启用整齐打印",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "preLaunchTask": "C/C++: g++.exe 生成活动文件"
+        }
+    ]
+}

.vscode/settings.json

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+{
+    "python.linting.pylintEnabled": true,
+    "python.linting.enabled": true,
+    "python.pythonPath": "C:\\Python\\python.exe",
+    "files.associations": {
+        "xstring": "cpp",
+        "deque": "cpp",
+        "initializer_list": "cpp",
+        "list": "cpp",
+        "vector": "cpp",
+        "xutility": "cpp",
+        "regex": "cpp",
+        "chrono": "cpp",
+        "iostream": "cpp",
+        "ostream": "cpp",
+        "iomanip": "cpp",
+        "algorithm": "cpp",
+        "atomic": "cpp",
+        "cctype": "cpp",
+        "cmath": "cpp",
+        "compare": "cpp",
+        "concepts": "cpp",
+        "condition_variable": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "exception": "cpp",
+        "resumable": "cpp",
+        "fstream": "cpp",
+        "functional": "cpp",
+        "future": "cpp",
+        "ios": "cpp",
+        "iosfwd": "cpp",
+        "istream": "cpp",
+        "iterator": "cpp",
+        "limits": "cpp",
+        "locale": "cpp",
+        "map": "cpp",
+        "memory": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "numeric": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "set": "cpp",
+        "sstream": "cpp",
+        "stack": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string": "cpp",
+        "system_error": "cpp",
+        "thread": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp",
+        "unordered_map": "cpp",
+        "unordered_set": "cpp",
+        "utility": "cpp",
+        "xfacet": "cpp",
+        "xhash": "cpp",
+        "xiosbase": "cpp",
+        "xlocale": "cpp",
+        "xlocbuf": "cpp",
+        "xlocinfo": "cpp",
+        "xlocmes": "cpp",
+        "xlocmon": "cpp",
+        "xlocnum": "cpp",
+        "xloctime": "cpp",
+        "xmemory": "cpp",
+        "xstddef": "cpp",
+        "xtr1common": "cpp",
+        "xtree": "cpp"
+    },
+    "git.ignoreLimitWarning": true
+}

.vscode/tasks.json

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+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++.exe 生成活动文件",
+            "command": "D:\\mingw\\mingw64\\bin\\g++.exe",
+            "args": [
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": "build",
+            "detail": "调试器生成的任务。"
+        },
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++.exe 生成活动文件 ver(1)",
+            "command": "D:\\mingw\\mingw64\\bin\\g++.exe",
+            "args": [
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "调试器生成的任务。"
+        }
+    ],
+    "version": "2.0.0"
+}

Android/Activity.md

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+**Activity** 是用户可以执行的单一任务。Activity
+负责创建新的窗口供应用绘制和从系统中接收事件。Activity 是用 Java 编写的，扩展自
+[Activity](https://classroom.udacity.com/courses/ud851/lessons/93affc67-3f0b-4f9b-b3a4-a7a26f241a86/concepts/developer.android.com/reference/android/app/Activity.html)
+类
+
+Activity 会创建**视图**来向用户显示信息，并使用户与 Activity 互动。视图是
+Android UI 框架中的类。它们占据了屏幕上的方形区域，负责绘制并处理事件。Activity
+通过读取 XML 布局文件确定要创建哪些视图（并放在何处）。正如 Dan 提到的，这些 XML
+文件存储在标记为 **layouts** 的 **res 文件夹**内。
+
+Activity
+提供视图上的操作，UI类提供视图的展示格式，包括什么样的按钮，什么样的容器，什么样的文本框。
+
+视图类型UI组件（具有互动性）、容器视图）容纳其他的UI组件或者视图。
+
+视图的XML属性：
+
+id,layout\_width,layout_height,layout_gravity,layout_margin,padding,
+
+R 类
+
+当你的应用被编译时，系统会生成
+[R](http://developer.android.youdaxue.com/reference/android/R.html)
+类。它会创建常量，使你能够动态地确定 res
+文件夹的各种内容，包括布局。要了解详情，请参阅关于[资源](http://developer.android.youdaxue.com/guide/topics/resources/accessing-resources.html)的文档。
+
+本质上是 Android 会读取你的 XML 文件并为你的布局文件中的每个标记生成 Java
+对象。然后，你可以在 Java 代码中通过对 Java 对象调用方法修改这些对象。