Own keyboard for Text Fields, how to do it?

Question

Android

You need to call your keyboard for all text fields, in which there are only numbers and symbols.
How to implement this in your project.
P.S. The keyboard is needed in the interior of the project, and not written separately.

Answer 1

So what's the problem?
If you don't want to do full-fledged clave
code.tutsplus.com/tutorials/create-a-custom-keyboa... ,
Create a layout based on TableLayout or GridLayout and load via ViewStub.
Or quite simply, limit the input characters to the text field
developer.android.com/reference/android/widget/Tex...
stackoverflow.com/questions/3349121/how-do-i-use-i...
developer.android. com/reference/android/text/TextW...

Answer 2

Create a layout with the necessary buttons, in the code for each button you hang a handler

new OnClickListener() {
@Override
      public void onClick(View v) {
        new Thread(new Runnable() {
          @Override
          public void run() {
            Instrumentation instr = new Instrumentation();
            instr.sendKeyDownUpSync(KeyEvent.KEYCODE_0);
          }
        }).start();
      }
    }

KeyEvent.KEYCODE_0 respectively replace with the desired constant