Flutter开发之动态权限的使用

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.kill_attendance">
        <!-- 申请Android权限-->
    <!--网络访问-->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

    <!-- Permissions options for the `contacts` group -->
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />

    <!-- Permissions options for the `storage` group -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Permissions options for the `camera` group -->
    <uses-permission android:name="android.permission.CAMERA" />

    <!-- Permissions options for the `location` group -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

    <!-- Permissions options for the `microphone` or `speech` group -->
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
         <!-- app名称,图标 -->
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="应用名称"
        android:icon="@mipmap/icon">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
</manifest>

await Map<PermissionGroup, PermissionStatus> map= PermissionHandler().requestPermissions([ 权限列表])

PermissionStatus contactsPermStatus = await PermissionHandler().checkPermissionStatus(PermissionGroup.contacts);

  ///请求权限
  void _requestPermission() async {
    debugPrint("进入闪屏页面");
    // 申请权限
    // PermissionStatus storageStatus ;
    PermissionStatus cameraStatus;

     await PermissionHandler().requestPermissions(
          [ PermissionGroup.camera]).then((value) {
             debugPrint("返回:$value");
            // storageStatus=value[PermissionGroup.storage];
            cameraStatus=value[PermissionGroup.camera];
          });
    debugPrint("请求权限,并获取权限:$cameraStatus");

    //校验权限
    if (cameraStatus == PermissionStatus.granted) {
      debugPrint("校验权限:用户都同意了");
      //用户都同意了(用&&)
      ///权限都申请成功初始化闪屏
      _initSplash();
    } else if ( cameraStatus == PermissionStatus.denied) {
      debugPrint("校验权限:有任何一组权限被用户拒绝");
      //用户拒绝了(用||)
      ///有任何一组权限被用户拒绝
      //拼接提示权限文本
      StringBuffer sb = new StringBuffer();
      sb.write(cameraStatus == PermissionStatus.denied ? "相机," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您拒绝了应用的必要权限:\n[$tip],是否重新申请?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => SystemNavigator.pop(),
          ));
    } else if (  cameraStatus == PermissionStatus.neverAskAgain) {
      debugPrint("校验权限:有权限永久拒绝");
      //有权限永久拒绝(用||)
      ///有任何一组权限选了不再提示
      //拼接提示权限文本
      StringBuffer sb = new StringBuffer();
      sb.write(cameraStatus == PermissionStatus.neverAskAgain ? "相机," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您禁用了应用的必要权限:\n[$tip],请到设置里允许?",
            canBackDismiss: false,
            confirmText: "去设置",
            confirmCallback: () async {
              await PermissionHandler().openAppSettings(); //打开设置页面
              SystemNavigator.pop();
            },
            cancelCallback: () => SystemNavigator.pop(),
          ));
    }

  }

await [权限列表].request();   //可以使用then,用权限获取状态

  ///请求权限
  void _requestPermission() async {
    debugPrint("进入闪屏页面");
    // 申请权限
    // PermissionStatus cameraStatus;

    await [Permission.camera].request();
    // .then((value){
      //设置申请后的结果
        // cameraStatus=value[Permission.camera];
      // });
    //或者直接调用:
    debugPrint("请求权限,并获取权限");
    if(await Permission.camera.isDenied){

    }
    
    //校验权限
    if (await Permission.camera.isGranted) {
      debugPrint("校验权限:用户都同意了");
      //用户都同意了(用&&)
      ///权限都申请成功初始化闪屏
      _initSplash();
    } else if ( await Permission.camera.isDenied) {
      debugPrint("校验权限:有任何一组权限被用户拒绝");
      //用户拒绝了(用||)
      ///有任何一组权限被用户拒绝
      //拼接提示权限文本
      StringBuffer sb = new StringBuffer();
      sb.write(await Permission.camera.isDenied? "相机," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您拒绝了应用的必要权限:\n[$tip],是否重新申请?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => SystemNavigator.pop(),
          ));
    } else if ( await Permission.camera.isPermanentlyDenied) {
      debugPrint("校验权限:有权限永久拒绝");
      //有权限永久拒绝(用||)
      ///有任何一组权限选了不再提示
      //拼接提示权限文本
      StringBuffer sb = new StringBuffer();
      sb.write( await Permission.camera.isPermanentlyDenied ? "相机," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您禁用了应用的必要权限:\n[$tip],请到设置里允许?",
            canBackDismiss: false,
            confirmText: "去设置",
            confirmCallback: () async {
              await openAppSettings(); //打开设置页面
              SystemNavigator.pop();
            },
            cancelCallback: () => SystemNavigator.pop(),
          ));
    }

  }