CODEWITHSUNDEEP
androidxamarinxamarin.android
Benedetto Del Greco
Benedetto Del Greco

Reputation: 162

How to intercept Hardware Keyboard Buttons in Xamarin.Android?

I am writing an Android App using Xamarin.Android. I have to detect the hardware keyboard buttons (since my target device is a flip-phone), but I don't know how to do it in Xamarin.

In java it was something like this:

    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
 switch(keyCode)
{
 case KeyEvent.KEYCODE_VOLUME_UP: 
     Toast.makeText(this, "Volume Up pressed", Toast.LENGTH_SHORT).show();
    return true; 
   case KeyEvent.KEYCODE_VOLUME_DOWN:
     Toast.makeText(this, "Volume Down pressed", Toast.LENGTH_SHORT).show();
     return true;
 }
 return super.onKeyDown(keyCode, event);
}

Is there any way to detect/intercept keyboard buttons? some code example please?

Thank you all!

EDIT

I am looking for something that will allow me to have access to every single hardware button of the keyboard (1,2,3,4,5,6,7,8,9,0,#,*, call btn, endCall btn, etc.)

SECOND EDIT

Found what might be the problem...the code works perfectly, but since my app is a Launcher when I press number keys the dialer starts, any idea on how redirect the dialing to an activity I create?

Upvotes: 3

Views: 4677

Answers (2)

Benedetto Del Greco
Benedetto Del Greco

Reputation: 162

This is my final solution to intercept numpad keys on android devices. I hope this will help somebody else in the future.

 [Activity(Label = "PhoneTask", LaunchMode = Android.Content.PM.LaunchMode.SingleTop)]
    [IntentFilter(new[] { Intent.ActionDial, Intent.ActionCallButton, Intent.ActionView },
         Categories = new[] { Intent.CategoryDefault },
         DataScheme = "tel")]

Just added this piece of code above my activity class and now, when I press these buttons on a laucher app, I am redirected to my activity.

Upvotes: 0

Shalva Avanashvili
Shalva Avanashvili

Reputation: 899

Put this method in your activity:

public override bool OnKeyDown (Keycode keyCode, KeyEvent e)
    {
        switch (keyCode) {
        case Keycode.VolumeUp:
            Toast.MakeText (this, "Volume Up pressed", ToastLength.Long).Show ();
            return true;
            break;
        case Keycode.VolumeDown:
            Toast.MakeText (this, "Volume Down pressed", ToastLength.Long).Show ();
            return true;
            break;
        }
        return base.OnKeyDown (keyCode, e);
    }

Upvotes: 1

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