第四讲 动态权限申请

README.md

@@ -11,6 +11,6 @@ Flutter 脚手架 快速开发模版
 ## Getting Started
 
 *  2020 -12-05  第一天 [Flutter应用开发从0到1基础架构搭建效果预览](https://www.bilibili.com/video/BV1rZ4y1G7cK/)
-*  2020 -12-06  第二天[Flutter项目创建、Android Studio的基本断点调试 应用图标更换、应用名称修改](https://www.bilibili.com/video/BV1pt4y1Y7F8/)
-*  2020 -12-07  第三天[Flutter从0到1构建应用启动页面、闪屏页面 600行字幕 带大家轻松玩转-正在发布]()
+*  2020 -12-06  第二天 [Flutter项目创建、Android Studio的基本断点调试 应用图标更换、应用名称修改](https://www.bilibili.com/video/BV1pt4y1Y7F8/)
+*  2020 -12-07  第三天 [Flutter从0到1构建应用启动页面、闪屏页面 600行字幕 带大家轻松玩转-正在发布](https://www.bilibili.com/video/BV1VA41147WG/)
 

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.studyyoun.flutter_ho">
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <application
         android:label="flutter Ho"
         android:icon="@mipmap/app_icon">

ios/Flutter/Debug.xcconfig

@@ -1 +1,2 @@
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"

ios/Flutter/Release.xcconfig

@@ -1 +1,2 @@
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"

ios/Runner.xcodeproj/project.pbxproj

@@ -14,6 +14,7 @@
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+		D782D52B85D2EE8FD8B57779 /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 2628FE28A1CFF29338E92A1E /* libPods-Runner.a */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -32,7 +33,9 @@
 /* Begin PBXFileReference section */
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		2628FE28A1CFF29338E92A1E /* libPods-Runner.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libPods-Runner.a"; sourceTree = BUILT_PRODUCTS_DIR; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		454518B0410689CAE89D4EE7 /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
 		7AFFD8EE1D35381100E5BB4D /* AppDelegate.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
@@ -44,19 +47,41 @@
 		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		A3FB15E79C3F6EDC42B44C04 /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
+		B7EB0D19D84D8B9BEF688A5F /* Pods-Runner.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.profile.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
 		97C146EB1CF9000F007C117D /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				D782D52B85D2EE8FD8B57779 /* libPods-Runner.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		6E29A3D1E4EEA938EB5F7DA2 /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+				A3FB15E79C3F6EDC42B44C04 /* Pods-Runner.debug.xcconfig */,
+				454518B0410689CAE89D4EE7 /* Pods-Runner.release.xcconfig */,
+				B7EB0D19D84D8B9BEF688A5F /* Pods-Runner.profile.xcconfig */,
+			);
+			name = Pods;
+			path = Pods;
+			sourceTree = "<group>";
+		};
+		8B5F970AAD82DE761B462407 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				2628FE28A1CFF29338E92A1E /* libPods-Runner.a */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
@@ -74,6 +99,8 @@
 				9740EEB11CF90186004384FC /* Flutter */,
 				97C146F01CF9000F007C117D /* Runner */,
 				97C146EF1CF9000F007C117D /* Products */,
+				6E29A3D1E4EEA938EB5F7DA2 /* Pods */,
+				8B5F970AAD82DE761B462407 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -116,12 +143,14 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
+				588F13F58ADFE109D5350F29 /* [CP] Check Pods Manifest.lock */,
 				9740EEB61CF901F6004384FC /* Run Script */,
 				97C146EA1CF9000F007C117D /* Sources */,
 				97C146EB1CF9000F007C117D /* Frameworks */,
 				97C146EC1CF9000F007C117D /* Resources */,
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+				950CCAC0D8C70D8D43960F4B /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
@@ -193,6 +222,45 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
 		};
+		588F13F58ADFE109D5350F29 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Runner-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		950CCAC0D8C70D8D43960F4B /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;

lib/src/index_page.dart

@@ -1,13 +1,15 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 /// 创建人： Created by zhaolong
 /// 创建时间：Created by  on 2020/12/7.
 ///
 /// 可关注公众号：我的大前端生涯   获取最新技术分享
 /// 可关注网易云课堂：https://study.163.com/instructor/1021406098.htm
 /// 可关注博客：https://blog.csdn.net/zl18603543572
-///
+/// 启动默认显示的页面
 /// 代码清单
 
 class IndexPage extends StatefulWidget {
@@ -17,7 +19,34 @@ class IndexPage extends StatefulWidget {
   }
 }
 
-class _IndexPageState extends State {
+class _IndexPageState extends State with WidgetsBindingObserver {
+  //页面的初始化函数
+  @override
+  void initState() {
+    super.initState();
+
+    checkPermisson();
+
+    //注册观察者
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    super.didChangeAppLifecycleState(state);
+    if (state == AppLifecycleState.resumed && _isGoSetting) {
+      checkPermisson();
+    }
+  }
+
+  @override
+  void dispose() {
+    //注销观察者
+    WidgetsBinding.instance.removeObserver(this);
+
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -30,4 +59,91 @@ class _IndexPageState extends State {
       ),
     );
   }
+
+  void checkPermisson({PermissionStatus status}) async {
+    //权限
+    Permission permission = Permission.storage;
+
+    if (status == null) {
+      //权限状态
+      status = await permission.status;
+    }
+
+    if (status.isUndetermined) {
+      //第一次申请
+      showPermissonAlert(_list[0], "同意", permission);
+    } else if (status.isDenied) {
+      //用户第一次申请拒绝
+      showPermissonAlert(_list[1], "重试", permission);
+    } else if (status.isPermanentlyDenied) {
+      //第二次申请 用户拒绝
+      showPermissonAlert(_list[2], "去设置中心", permission, isSetting: true);
+    } else {
+      //通过
+    }
+  }
+
+  List<String> _list = [
+    "为您更好的体验应用，所以需要获取您的手机文件存储权限，以保存您的一些偏好设置",
+    "您已拒绝权限，所以无法保存您的一些偏好设置，将无法使用APP",
+    "您已拒绝权限，请在设置中心中同意APP的权限请求",
+    "其他错误"
+  ];
+
+  //是否去设置中心
+  bool _isGoSetting = false;
+
+  void showPermissonAlert(
+      String message, String rightString, Permission permission,
+      {bool isSetting = false}) {
+    showCupertinoDialog(
+        builder: (BuildContext context) {
+          return CupertinoAlertDialog(
+            title: Text("温馨提示"),
+            content: Container(
+              padding: EdgeInsets.all(12),
+              child: Text(message),
+            ),
+            actions: [
+              //左边的按钮
+              CupertinoDialogAction(
+                child: Text("退出应用"),
+                onPressed: () {
+                  closeApp();
+                },
+              ),
+              //右边的按钮
+              CupertinoDialogAction(
+                child: Text("$rightString"),
+                onPressed: () {
+                  //关闭弹框
+                  Navigator.of(context).pop();
+                  if (isSetting) {
+                    _isGoSetting = true;
+                    //去设置中心
+                    openAppSettings();
+                  } else {
+                    //申请权限
+                    requestPermiss(permission);
+                  }
+                },
+              )
+            ],
+          );
+        },
+        context: context);
+  }
+
+  void requestPermiss(Permission permission) async {
+    //发起权限申请
+    PermissionStatus status = await permission.request();
+
+    //校验
+    checkPermisson();
+  }
+
+  void closeApp() {
+    //关闭应用的方法
+    SystemChannels.platform.invokeMethod("SystemNavigator.pop");
+  }
 }

pubspec.lock

@@ -88,6 +88,27 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.8.0-nullsafety.1"
+  permission_handler:
+    dependency: "direct main"
+    description:
+      name: permission_handler
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "5.0.1+1"
+  permission_handler_platform_interface:
+    dependency: transitive
+    description:
+      name: permission_handler_platform_interface
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -151,3 +172,4 @@ packages:
     version: "2.1.0-nullsafety.3"
 sdks:
   dart: ">=2.10.0-110 <=2.11.0-213.0.dev"
+  flutter: ">=1.12.8 <2.0.0"

pubspec.yaml

@@ -16,10 +16,14 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.0
 
+  # 权限请求
+  permission_handler: ^5.0.1+1
+
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
+
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec