[Solved] Define a value to EditText

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Use this.

If (edittext.getText().toString()==myPreProgrammedString){
   start next activity
}
else{
   show warning wrong password
}

Usually you would put something like this in a onClick method of a login button. But I use something similar in textwatchers afterTextChanged method to check if the entered text is in a list and then enable the OK button.

BTW: hardcoding passwords in an app is never good practice.

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solved Define a value to EditText