如何使用Camera xamarin Forms android捕获多张照片

我正在开发Xamrin表单应用程序。 在其中，我试图使用具有相同意图的相机拍摄多张照片。 没有使用任何nuget包？

为此，我关注此链接相机

 MainActivity.cs static readonly File file = new File(Environment.GetExternalStoragePublicDirectory( Environment.DirectoryPictures), "tmp.jpg"); 

在OnCreate结束时

 (Xamarin.Forms.Application.Current as App).ShouldTakePicture += () => { var intent = new Intent(MediaStore.ActionImageCapture); intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(file)); StartActivityForResult(intent, 0); }; 

在这里我只点击了相机按钮上的1张照片，但我想拍摄更多照片，我想要它的文件路径

在OnActivityResult中

 (Xamarin.Forms.Application.Current as App).ShowImage(file.Path); 

但也许它几乎没有限制，例如我们无法一次拍摄多张照片？ 有人知道如何捕获多张照片并将其绑定到listview吗？

Answer 1

是的，经过这么多的努力，我能够做到这一点。 对于以xamarinforms从事此类工作的人可能会有所帮助。

这是我的代码

  public partial class App : Application { // public static App Instance; public App () { MainPage = new CameraGallery.MainPage(); InitializeComponent(); } } 

MainPage.xaml中

//请安装FlowListView和ffimageloading nuget pckg

MainPage.xaml.cs中

  public partial class MainPage : ContentPage { ObservableCollection camImageCollection; public static MainPage Instance; public MainPage() { InitializeComponent(); Instance = this; var btn = new Button { Text = "Snap!", Command = new Command(o => ShouldTakePicture()), }; CameraLayout.Children.Add(btn); camImageCollection = new ObservableCollection(); } public event Action ShouldTakePicture = () => { }; public void ShowImage(string[] filepath) { foreach(var item in filepath) camImageCollection.Add(item); listItemsCam.FlowItemsSource = camImageCollection; } } 

现在转到你的MainActivity.cs里面的android项目

 [Activity(Label = "CameraGallery", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity { public static int OPENCAMERACODE = 102; //inside OnCreate after LoadApplication(new App()); add these lines protected override void OnCreate(Bundle bundle) { TabLayoutResource = Resource.Layout.Tabbar; ToolbarResource = Resource.Layout.Toolbar; UserDialogs.Init(this); base.OnCreate(bundle); global::Xamarin.Forms.Forms.Init(this, bundle); FlowListView.Init(); CachedImageRenderer.Init(false); LoadApplication(new App()); MainPage.Instance.ShouldTakePicture += () => { ICursor cursor = loadCursor(); image_count_before = cursor.Count; cursor.Close(); Intent intent = new Intent(MediaStore.IntentActionStillImageCamera); IList activities = PackageManager.QueryIntentActivities(intent, 0); if(activities.Count >0) StartActivityForResult(Intent.CreateChooser(intent, "Camera Capture"), OPENCAMERACODE); }; } public ICursor loadCursor() { string[] columns = new string[] { MediaStore.Images.ImageColumns.Data, MediaStore.Images.ImageColumns.Id }; string orderBy = MediaStore.Images.ImageColumns.DateAdded; return ContentResolver.Query(MediaStore.Images.Media.ExternalContentUri, columns, null, null, orderBy); } private void exitingCamera() { ICursor cursor = loadCursor(); string[] paths = getImagePaths(cursor, image_count_before); MainPage.Instance.ShowImage(paths);// this parameter pass to MainPage.xaml.cs cursor.Close(); } public string[] getImagePaths(ICursor cursor, int startPosition) { int size = cursor.Count - startPosition; if (size <= 0) return null; string[] paths = new string[size]; int dataColumnIndex = cursor.GetColumnIndex(MediaStore.Images.ImageColumns.Data); for (int i = startPosition; i < cursor.Count; i++) { cursor.MoveToPosition(i); paths[i - startPosition] = cursor.GetString(dataColumnIndex); } return paths; } //inside OnActivityResult method do this protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) { base.OnActivityResult(requestCode, resultCode, data); switch (requestCode) { case 102: exitingCamera(); break; } } } 

我希望这有助于某人。 享受编码......