Calling the keyboard delete/backspace action on a button?

Question

Is there a way to put the keyboard backspace action on the button or will I have to do it custom?

Answer 1

We can use Instrumentation class to simulate a Keyevent with code.

in kotlin

val instrumentation = Instrumentation()
instrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_DEL)

I just test it and worked on my emulator (API 29)

Notice: Instrumentation can not be called in main-thread

---

so you may do this below

in Kotlin

thread
{
    Instrumentation()
    instrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_DEL)
{

in Java

new Thread()
{
    ..
    new Instrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_DEL);
    ..
}.start();

---

KeyEvent.KEYCODE_DEL = BackSpace

KeyEvent.KEYCODE_FORWARD_DEL = Delete

---

Update example

let me show you a snippet

btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            new Thread(){
                @Override
                public void run() {

                    Instrumentation instrumentation = new Instrumentation();
                    instrumentation.sendKeyDownUpSync(KeyEvent.KEYCODE_DEL);
                }
            }.start();
        }
    });

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