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I am not able to erase emoji with single hit of backspace button,i had hit it many times,i have hash map of Unicode ,from which i am appending a Unicode to edit text
public class EmojiUtils
{

public static HashMap<Integer, String> unicode = new HashMap<Integer, String>();
static
{

    unicode.put(1, "\uD83D\uDE04");//Smiling Face with Open Mouth and Smiling Eyes
    unicode.put(2, "\uD83D\uDE03");//Smiling Face With Open Mouth
    unicode.put(3, "\uD83D\uDE00");//Grinning Face
    unicode.put(4, "\uD83D\uDE0A");//Grinning Face with Smiling Eyes
    unicode.put(5, "\u263A\uFE0F");//Smiling Face

}

and this how i am appending an Unicode to edit text
Integer key = index;
Log.d("emoji", "index of clicked emoji is" + index);
Log.d("emoji", "Unicode of clicked emoji is" + EmojiUtils.unicode.get(key));
SpannableString spannable =new SpannableString(EmojiUtils.unicode.get(key));
//String cs = EmojiUtils.unicode.get(key);
int cursorPosition = edtMessage.getSelectionStart();
edtMessage.getText().insert(cursorPosition, spannable);