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Now I solve the issue. here is the code I add.



public void btndoublezero(View view) {
updateText("00");
EditText editText = (EditText)findViewById(R.id.input);
...

package com.example.englishcalculator;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import org.mariuszgromada.math.mxparser.*;
import...

hi members I am beginner in android development Here some issue in calculator with my Double zero button for example when i press btn 1 for one and btn 00 for double zero and again press btn 1 for...