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 xamarin c# manual image app walkthrough

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Moti Barski


Posts : 79
Join date : 2011-08-02

PostSubject: xamarin c# manual image app walkthrough   Sat Aug 12, 2017 2:08 pm

take a picture
new project, c#, android, single view app
Open Solution Explorer-> Project Name->Resources->Layout->Main.axml. Click Open Design View
solution explorer, resources, main.axml code :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
        android:layout_height="fill_parent" />
        android:text="Open Camera" />
Go to Solution Explorer-> Project Name. Right click to Add->Class, followed by opening new Dialog box. This dialog box is required to select the class and give name for BitmapHelpers.cs.
Open Solution Explorer-> Project Name->Resources-> BitmapHelpers.cs. This class is reducing the image size and recycling the memory. It will be used to calculate an image ratio.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Graphics;
using Android.Graphics.Drawables;
namespace Camera
    public static class BitmapHelpers
        /// This method will recyle the memory help by a bitmap in an ImageView  
        public static void RecycleBitmap(this ImageView imageView)
            if (imageView == null)
            Drawable toRecycle = imageView.Drawable;
            if (toRecycle != null)
        /// Load the image from the device, and resize it to the specified dimensions.  
        public static Bitmap LoadAndResizeBitmap(this string fileName, int width, int height)
            // First we get the the dimensions of the file on disk  
            BitmapFactory.Options options = new BitmapFactory.Options
                InPurgeable = true,
                InJustDecodeBounds = true
            BitmapFactory.DecodeFile(fileName, options);
            // Next we calculate the ratio that we need to resize the image by  
            // in order to fit the requested dimensions.  
            int outHeight = options.OutHeight;
            int outWidth = options.OutWidth;
            int inSampleSize = 1;
            if (outHeight > height || outWidth > width)
                inSampleSize = outWidth > outHeight ? outHeight / height : outWidth / width;
            // Now we will load the image and have BitmapFactory resize it for us.  
            options.InSampleSize = inSampleSize;
            options.InJustDecodeBounds = false;
            Bitmap resizedBitmap = BitmapFactory.DecodeFile(fileName, options);
            return resizedBitmap;

Open Solution Explorer-> Project Name->Resources-> MainActicity.cs. Add code, given below-

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Telephony;
using Android.Provider;
using Java.IO;
using Android.Graphics;
using Android.Content.PM;
using Uri = Android.Net.Uri;
using System.Collections.Generic;
using Camera;

namespace TheInternship
    [Activity(Label = "TheInternship", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
        Button BtnTakeImg;
        ImageView ImgView;
        public static File _file;
        public static File _dir;
        protected override void OnCreate(Bundle bundle)
            // Set our view from the "main" layout resource  
            if (IsThereAnAppToTakePictures())
                BtnTakeImg = FindViewById<Button>(Resource.Id.btnCamera);
                ImgView = FindViewById<ImageView>(Resource.Id.imageView);
                BtnTakeImg.Click += TakeAPicture;
        private void CreateDirectoryForPictures()
            _dir = new File(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures), "C#Corner");
            if (!_dir.Exists())
        private bool IsThereAnAppToTakePictures()
            Intent intent = new Intent(MediaStore.ActionImageCapture);
            IList<ResolveInfo> availableActivities = PackageManager.QueryIntentActivities(intent, PackageInfoFlags.MatchDefaultOnly);
            return availableActivities != null && availableActivities.Count > 0;
        private void TakeAPicture(object sender, EventArgs eventArgs)

            Intent intent = new Intent(MediaStore.ActionImageCapture);
            _file = new File(_dir, string.Format("Image_{0}.jpg", Guid.NewGuid()));
            intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(_file));
            StartActivityForResult(intent, 102);
        protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
            if (requestCode == 102 && resultCode == Result.Ok)
                // make it available in the gallery  
                Intent mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
                Uri contentUri = Uri.FromFile(_file);
                //Converstion Image Size  
                int height = ImgView.Height;
                int width = Resources.DisplayMetrics.WidthPixels;
                using (Bitmap bitmap = _file.Path.LoadAndResizeBitmap(width, height))
                    //View ImageView  
                    //Upload Image in Database  

run app
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