How to write style to error text of EditText in android?

Question

I\'m trying to write new custom style for my android application. I need to give style to errorText which appears after setting setError in EditText

Answer 1

I have not found any solution to edit error style, but I have created custom EditText with error popup. Hopefully, it will help:

import android.content.Context
import android.util.AttributeSet
import android.view.Gravity
import android.view.LayoutInflater
import android.widget.EditText
import android.widget.LinearLayout
import android.widget.PopupWindow
import android.widget.TextView
import androidx.annotation.StringRes

class ErrorEditText : EditText {

    constructor(context: Context) : super(context)

    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)

    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    private var errorPopup: PopupWindow? = null

    fun showError(message: String) {
        showErrorPopup(message)
    }

    fun showError(@StringRes messageResId: Int) {
        showErrorPopup(context.getString(messageResId))
    }

    fun dismissError() {
        post {errorPopup?.dismiss() }
    }

      private fun showErrorPopup(message: String) {
        post {
            dismissError()
            val inflater = (context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater)
            val view = inflater.inflate(R.layout.edit_text_error, null, false)
            errorPopup =
                PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)
            errorPopup?.contentView?.findViewById(R.id.message)?.text = message
            errorPopup?.showAsDropDown(this, 0, 10, Gravity.START)
        }
    }
}

You can use methods: showError(message: String) or showError(@StringRes messageResId: String) to show the error and method dismissError() to hide it.

Keep in mind that pop-ups are bound with activity lifecycle if you are using multiple fragments to navigate through the app, remember about closing them when navigating.

Here is my edit_text_error layout used for popup:

If you'd like to move popup to the end of EditText, please change last line in showErrorPopup() method to: errorPopup?.showAsDropDown(this, 0, 10, Gravity.END)

You can manipulate the position of the popup by modifying gravity or x and y parameters of the showAsDropDown(view: View, x: Int, y: Int, gravity: Gravity) method