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Disable one key on custom keyboard in Android

Posted by: admin May 14, 2020 Leave a comment

Questions:

I have custom keyboard in my app for Android. It’s layout described in xml like this

<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"">
 <Row>
     <Key android:keyLabel="F1" android:keyOutputText="F1"/>
     <Key android:keyLabel="F2" android:keyOutputText="F2"/>
     <Key android:keyLabel="F3" android:keyOutputText="F3"/>
...

So, i’m insteresting how i can disable, for example ‘f1’ key ~ make it grey and untouchable.
There are some similar questions here, but all about default soft-KB.

I know I can iterate through keys like this

for (Keyboard.Key key : myKeyboard.getKeys())

but it’s look like objects of Keyboard.Key class are useless for any changes in key’s look.

UPD: I did not found solution. I implemented keyboard manually – big relative layout, common buttons and custom buttons and everything fine. By the way – custom keyboard at least more beautiful. Just copy resources from droid 4+ – and you’ll get nice modern transparent buttons and transparent layout on every platform.

How to&Answers:

I am currently using android:horizontalGap to place a black gap (with the width of a key) in the place where the disabled key should be placed (in this way, I can hide keys not allowed in each screen, because my keyboard has always the same distribution). It’s a poor workaround, though.

The main problem is for the rightmost keys, since android:horizontalGap can only be set for the left side of a key. But using an android:keyWidth="0" attribute in a rightmost fake key and then setting there the proper android:horizontalGap, does the trick. An even poorer workaround…

Any better solution?

Answer:

Usually the keyboard is only visible if you are editing something, so you can trap the edits via the object. If its an editText box then you can add a listener and then you could disable any response to the edit text. I’m not sure if this is useful to you but at least you can trap any unwanted input.

    // add a keylistener to keep track user input
    editText.setOnKeyListener(new View.OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            // if keydown and "enter" is pressed
            if ((event.getAction() == KeyEvent.ACTION_DOWN)
                    && (keyCode == KeyEvent.KEYCODE_ENTER)) {

                // do some thing or nothing

                return true;

            }

            return false;
        }
    });

Answer:

If Key is a Button, then it’s simple:

key.setEnabled(false);

Otherwise, just make it not clickable:

key.setClickable(false);

…and change its’ appearance (background color, text color, etc.). The simplest way to do this is:

key.setBackgroundColor("0xFFAAAAAA");