[Xamarin][原创]Android SD卡读写 动态权限添加

先 要在AndroidManifest.xml文件中添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> 然后Activity中设置两个私有静态变量

private static final int REQUEST_EXTERNAL_STORAGE = 1; private static String[] PERMISSIONS_STORAGE = {         "android.permission.READ_EXTERNAL_STORAGE",         "android.permission.WRITE_EXTERNAL_STORAGE" }; 然后在Activity中的onCreate引用方法  protected override void OnCreate(Bundle savedInstanceState)         {             base.OnCreate(savedInstanceState);             Xamarin.Essentials.Platform.Init(this, savedInstanceState);             // Set our view from the "main" layout resource             SetContentView(Resource.Layout.activity_main);             verifyStoragePermissions(this);         }

 public void verifyStoragePermissions(Activity activity)         {             try             {                 //检测是否有写的权限                 var permission = ActivityCompat.CheckSelfPermission(activity,"android.permission.WRITE_EXTERNAL_STORAGE");                 if (permission != Android.Content.PM.Permission.Granted)                 {                     // 没有写的权限，去申请写的权限，会弹出对话框                     ActivityCompat.RequestPermissions(activity, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);                 }             }             catch (Exception ex)             {                 Toast.MakeText(activity, ex.Message, ToastLength.Short).Show();             }         }