navigating a image from page to other in mono android - xamarin.android

Question

I have an ImageView and Button in an Activity, lets call it A. When clicking on the Button, I start the image gallery, where I select an image and load that into the ImageView.
On the ImageView I subscribe to the Touch events, where I want to launch another Activity, B.
My question is, how can I in Activity B get the image, which was selected in Activity A? How is data passed fomr Activity to another Activity?
Here is my code in Activity A:
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
_imageView = FindViewById<ImageView>(Resource.Id.imageView1);
_imageView.Touch += TouchMeImageViewOnTouch;
Button button = FindViewById<Button>(Resource.Id.button1);
button.Click += ButtonOnClick;
}
private void ButtonOnClick(object sender, EventArgs eventArgs)
{
Intent = new Intent();
Intent.SetType("image/*");
Intent.SetAction(Intent.ActionGetContent);
StartActivityForResult(Intent.CreateChooser(Intent, "Select Picture"), PickImageId);
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if ((requestCode == PickImageId) && (resultCode == Result.Ok) && (data != null))
{
Uri uri = data.Data;
_imageView.SetImageURI(uri);
string path = GetPathToImage(uri);
Toast.MakeText(this, path, ToastLength.Long);
}
}
private string GetPathToImage(Uri uri)
{
string path = null;
string[] projection = new[] { Android.Provider.MediaStore.Images.Media.InterfaceConsts.Data };
using (var cursor = ManagedQuery(uri, projection, null, null, null))
{
if (cursor != null)
{
int columnIndex = cursor.GetColumnIndexOrThrow(
Android.Provider.MediaStore.Images.Media.InterfaceConsts.Data);
cursor.MoveToFirst();
path = cursor.GetString(columnIndex);
}
}
return path;
}
private void TouchMeImageViewOnTouch(object sender, View.TouchEventArgs touchEventArgs)
{
}

Answer 1

In your TouchMeImageViewOnTouch method, you will need to start Activity B. This is done by creating an Intent. This Intent can hold extra stuff the Activity you launch (B), will be able to get hold of.
So I see that you already found out how to get the path to the image, which you simply can pass along to Activity B in the Intent which is done like this:
private void TouchMeImageViewOnTouch(object sender, View.TouchEventArgs touchEventArgs)
{
var intent = new Intent(this, typeof (MainActivity));
intent.PutExtra("imagePath", path);
StartActivity(intent);
}
Then in Activity B you can get the path with:
Intent.GetStringExtra("imagePath");
Then do whatever you want with it.