Delay setting the error message on an EditText. Avoid leaking that View, despite delay.

InputErrorHandler.java

import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.widget.EditText;

import java.lang.ref.WeakReference;

/**
 * Delay setting the error message on an EditText. Avoid leaking that View, despite delay.
 * <p>
 * Created by cmabee on 12/14/16.
 */

public class InputErrorHandler extends Handler {

    public static final int SHOW_ERROR = 0;
    public static final int SHOW_ERROR_DELAY = 1000;

    private WeakReference <EditText> mEditText;
    private WeakReference <String> mErrorText;

    /**
     * Create a Handler to delay setting the error message on an EditText.
     *
     * @param editText the EditText to display an error message
     * @param errorText the text to be displayed as the error message
     */
    public InputErrorHandler(@NonNull EditText editText, String errorText) {
        mEditText = new WeakReference<>(editText);
        mErrorText = new WeakReference<>(errorText);
    }

    @Override
    public void handleMessage(Message msg) {
        if (mEditText.get() == null) {
            return;
        }

        if (msg.what == SHOW_ERROR) {
            mEditText.get().setError(mErrorText.get());
        } else {
            mEditText.get().setError(null);
        }
    }
}