使用glide显示多张图片

Question

For a scanning ticket app, I want to display full screen image. The app does sequential operation. You scan your QrCode (first image), the device reach server (second image indicating to wait), then I display a third image if the ticket is validate, else I display the last one. I'm using glide and the image path is indicated in a second activity, I transmit URI to main activity with a sharedPreferences file.

Here is the issue:

val settings = getSharedPreferences("PrefFile", 0)
    if (S_mod){//priority on S_mod
        uri_State_init = Uri.parse(settings.getString("mainUri", "none"))
        uri_State_waiting = Uri.parse(settings.getString("waitUri", "none"))
        uri_State_validated = Uri.parse(settings.getString("okUri", "none"))
        uri_State_refused = Uri.parse(settings.getString("errorUri", "none"))
        displayUri( uri_State_init, background)
        image.setImageResource(R.drawable.empty)
    }

where displayUri is

fun displayUri( uri: Uri?, dir:ImageView){//use to display image known by uri, only for full screen
    Glide.with(this)
        .load(uri)
        .error(R.drawable.imagenotfound)  // image in case of error
        .override(1280, 800) // resizing if user doesn't respect the indicated dim
        .centerCrop()//type of resizing
        .into(dir)
}

The issue is that only the first image called by displayUri is displayed, the other call show the error image (imagenotfound)

It seem that I've not totally understood the glide extension.

If someone know about this particular issue thanks a lot!!

Answer 1

Here

val settings = getSharedPreferences("PrefFile", 0)
if (S_mod){//priority on S_mod
    uri_State_init = Uri.parse(settings.getString("mainUri", "none"))
    uri_State_waiting = Uri.parse(settings.getString("waitUri", "none"))
    uri_State_validated = Uri.parse(settings.getString("okUri", "none"))
    uri_State_refused = Uri.parse(settings.getString("errorUri", "none"))
    displayUri( uri_State_init, background)
    image.setImageResource(R.drawable.empty)
}

displayUri( uri_State_init, background)

You are just calling the display Image function with the same uri which means if you didn't passed the uri, then uri will be null and you will definitely get errors. What you can do is to send uri like this,

val settings = getSharedPreferences("PrefFile", 0)

if (S_mod){//priority on S_mod

    uri = Uri.parse(settings.getString("main_uri", "none"))

    displayUri( uri_State_init, background)

    image.setImageResource(R.drawable.empty)

}

Just change the value of main_uri in Shared Preferences whenever you want to change the state. You can also use onSharedPreferencesChanged Listener.