scene

When the user logs in for the first time , According to his choice, whether to save the password locally , And automatically fill in... The next time you open the application

resolvent

Use SharedPreferences Local storage

// Determine whether it is the first login 
val prefs = getSharedPreferences("data",Context.MODE_PRIVATE)
val prefsEdit = getSharedPreferences("data",Context.MODE_PRIVATE).edit()
val isRemember = prefs.getBoolean("remember_password",false)

// Read previous password 
if (isRemember){
    
    Log.d("Login.out","isRemember = $isRemember")
    val username = prefs.getString("account","")
    val password = prefs.getString("password","")
    loginBinding.usernameEdit.setText(username)
    loginBinding.passwordEdit.setText(password)
    loginBinding.rememberPass.isChecked = true
}

Use checkbox

To set up checkbox Click to listen for events ！！
Then judge whether he was elected

loginBinding.rememberPass.setOnClickListener {
    
    // The user chooses to remember the password   Save the user name and password locally 
    if (loginBinding.rememberPass.isChecked){
    
        Log.d("Login.out","isRememberPass = $isRemember")
        prefsEdit.putBoolean("remember_password",true)
        prefsEdit.putString("account",loginBinding.usernameEdit.text.toString())
        prefsEdit.putString("password",loginBinding.passwordEdit.text.toString())
        prefsEdit.apply() // Don't forget this sentence 
    }
}