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Flutter開(kāi)發(fā)之動(dòng)態(tài)權(quán)限的使用

 更新時(shí)間:2021年09月27日 11:31:27   作者:xiangzhihong8  
眾所周知,Android在6.0版本后將權(quán)限修改成了動(dòng)態(tài)權(quán)限,而iOS則一直使用的是動(dòng)態(tài)權(quán)限,所以在Flutter應(yīng)用開(kāi)發(fā)中如果涉及到一些危險(xiǎn)權(quán)限,就需要進(jìn)行動(dòng)態(tài)申請(qǐng),本文就詳細(xì)的介紹一下,感興趣的可以了解一下

眾所周知,Android在6.0版本后將權(quán)限修改成了動(dòng)態(tài)權(quán)限,而iOS則一直使用的是動(dòng)態(tài)權(quán)限,所以在Flutter應(yīng)用開(kāi)發(fā)中如果涉及到一些危險(xiǎn)權(quán)限,就需要進(jìn)行動(dòng)態(tài)申請(qǐng),動(dòng)態(tài)申請(qǐng)權(quán)限可以使用Flutter的permission_handler。

基本使用

1,配置權(quán)限

首先,打開(kāi)Android工程下的AndroidManifest.xml文件,具體路徑如下:在android\app\src\main\AndroidManifest.xml中配置,然后添加如下所示的權(quán)限。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.kill_attendance">
        <!-- 申請(qǐng)Android權(quán)限-->
    <!--網(wǎng)絡(luò)訪問(wèn)-->
    <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名稱,圖標(biāo) -->
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="應(yīng)用名稱"
        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>

動(dòng)態(tài)權(quán)限申請(qǐng)

目前,這個(gè)插件已經(jīng)升級(jí)了好幾版,而不同版本處理方法也不一樣,特別是最新的5.0.0版本和之前的版本,用法差別比較大。

4.3.0

例如,下面是4.3.0版本的用法:

  • 權(quán)限列表:PermissionGroup中的字段
  • 權(quán)限狀態(tài)列表:PermissionStatus中字段
  • 打開(kāi)權(quán)限設(shè)置頁(yè)面:await PermissionHandler().openAppSettings();
  • 申請(qǐng)權(quán)限

示例如下:

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

然后,是獲取申請(qǐng)權(quán)限的狀態(tài),如下:

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

下面是一個(gè)完整的示例:

  ///請(qǐng)求權(quán)限
  void _requestPermission() async {
    debugPrint("進(jìn)入閃屏頁(yè)面");
    // 申請(qǐng)權(quán)限
    // PermissionStatus storageStatus ;
    PermissionStatus cameraStatus;

     await PermissionHandler().requestPermissions(
          [ PermissionGroup.camera]).then((value) {
             debugPrint("返回:$value");
            // storageStatus=value[PermissionGroup.storage];
            cameraStatus=value[PermissionGroup.camera];
          });
    debugPrint("請(qǐng)求權(quán)限,并獲取權(quán)限:$cameraStatus");

    //校驗(yàn)權(quán)限
    if (cameraStatus == PermissionStatus.granted) {
      debugPrint("校驗(yàn)權(quán)限:用戶都同意了");
      //用戶都同意了(用&&)
      ///權(quán)限都申請(qǐng)成功初始化閃屏
      _initSplash();
    } else if ( cameraStatus == PermissionStatus.denied) {
      debugPrint("校驗(yàn)權(quán)限:有任何一組權(quán)限被用戶拒絕");
      //用戶拒絕了(用||)
      ///有任何一組權(quán)限被用戶拒絕
      //拼接提示權(quán)限文本
      StringBuffer sb = new StringBuffer();
      sb.write(cameraStatus == PermissionStatus.denied ? "相機(jī)," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您拒絕了應(yīng)用的必要權(quán)限:\n[$tip],是否重新申請(qǐng)?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => SystemNavigator.pop(),
          ));
    } else if (  cameraStatus == PermissionStatus.neverAskAgain) {
      debugPrint("校驗(yàn)權(quán)限:有權(quán)限永久拒絕");
      //有權(quán)限永久拒絕(用||)
      ///有任何一組權(quán)限選了不再提示
      //拼接提示權(quán)限文本
      StringBuffer sb = new StringBuffer();
      sb.write(cameraStatus == PermissionStatus.neverAskAgain ? "相機(jī)," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您禁用了應(yīng)用的必要權(quán)限:\n[$tip],請(qǐng)到設(shè)置里允許?",
            canBackDismiss: false,
            confirmText: "去設(shè)置",
            confirmCallback: () async {
              await PermissionHandler().openAppSettings(); //打開(kāi)設(shè)置頁(yè)面
              SystemNavigator.pop();
            },
            cancelCallback: () => SystemNavigator.pop(),
          ));
    }

  }

5.0.0

5.0.0版本和之前的寫法大體類似,只是方法和參數(shù)字段發(fā)生了改變,如下所示。

  • 權(quán)限列表:Permission中的字段
  • 權(quán)限狀態(tài)列表:PermissionStatus中字段
  • 打開(kāi)權(quán)限設(shè)置頁(yè)面:openAppSettings();
  • 申請(qǐng)權(quán)限
await [權(quán)限列表].request();   //可以使用then,用權(quán)限獲取狀態(tài)

獲取權(quán)限狀態(tài)await Permission.camera.status

判斷權(quán)限狀態(tài):await Permission.camera.isDenied|isGranted等

下面是詳細(xì)的使用示例:

  ///請(qǐng)求權(quán)限
  void _requestPermission() async {
    debugPrint("進(jìn)入閃屏頁(yè)面");
    // 申請(qǐng)權(quán)限
    // PermissionStatus cameraStatus;

    await [Permission.camera].request();
    // .then((value){
      //設(shè)置申請(qǐng)后的結(jié)果
        // cameraStatus=value[Permission.camera];
      // });
    //或者直接調(diào)用:
    debugPrint("請(qǐng)求權(quán)限,并獲取權(quán)限");
    if(await Permission.camera.isDenied){

    }
    
    //校驗(yàn)權(quán)限
    if (await Permission.camera.isGranted) {
      debugPrint("校驗(yàn)權(quán)限:用戶都同意了");
      //用戶都同意了(用&&)
      ///權(quán)限都申請(qǐng)成功初始化閃屏
      _initSplash();
    } else if ( await Permission.camera.isDenied) {
      debugPrint("校驗(yàn)權(quán)限:有任何一組權(quán)限被用戶拒絕");
      //用戶拒絕了(用||)
      ///有任何一組權(quán)限被用戶拒絕
      //拼接提示權(quán)限文本
      StringBuffer sb = new StringBuffer();
      sb.write(await Permission.camera.isDenied? "相機(jī)," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您拒絕了應(yīng)用的必要權(quán)限:\n[$tip],是否重新申請(qǐng)?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => SystemNavigator.pop(),
          ));
    } else if ( await Permission.camera.isPermanentlyDenied) {
      debugPrint("校驗(yàn)權(quán)限:有權(quán)限永久拒絕");
      //有權(quán)限永久拒絕(用||)
      ///有任何一組權(quán)限選了不再提示
      //拼接提示權(quán)限文本
      StringBuffer sb = new StringBuffer();
      sb.write( await Permission.camera.isPermanentlyDenied ? "相機(jī)," : "");
      String tip = Utils.removePostfix(sb.toString(), ",");

      Utils.showCustomDialog(
          context,
          ConfirmDialog(
            "您禁用了應(yīng)用的必要權(quán)限:\n[$tip],請(qǐng)到設(shè)置里允許?",
            canBackDismiss: false,
            confirmText: "去設(shè)置",
            confirmCallback: () async {
              await openAppSettings(); //打開(kāi)設(shè)置頁(yè)面
              SystemNavigator.pop();
            },
            cancelCallback: () => SystemNavigator.pop(),
          ));
    }

  }

參考: permission_handler

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