firebase 实时数据库无法在移动设备上运行，但在模拟器上运行

Question

binding.btSave.setOnClickListener {
        val firstName = binding.etFirstName.text.toString()
        val lastName = binding.etLastName.text.toString()
        val age = binding.etAge.text.toString()
        val userName = binding.etUserName.text.toString()

        if (firstName.isNotEmpty() && age.isNotEmpty() && lastName.isNotEmpty() && userName.isNotEmpty()) {

            try {

                database =
                    FirebaseDatabase.getInstance("My Url")
                        .getReference("Users")

                val users = User(firstName, lastName, age, userName)

                database.child(userName).setValue(users).addOnSuccessListener {

                    binding.etAge.text.clear()
                    binding.etFirstName.text.clear()
                    binding.etLastName.text.clear()
                    binding.etUserName.text.clear()

                    Toast.makeText(this, "Successfully added", Toast.LENGTH_SHORT).show()

                }.addOnFailureListener {

                    Toast.makeText(this, it.message, Toast.LENGTH_SHORT).show()

                }

            } catch (e: Exception) {

                Toast.makeText(this, e.message, Toast.LENGTH_LONG).show()

            } finally {
                Toast.makeText(this, "finished", Toast.LENGTH_SHORT).show()

            }
        }
    }

when I click the button it goes directly to "finally" of try catch in mobile but in emulator is ok and I give permission of internet and access network state to the app also the app is working for Authentication well

what should I do??

Answer 1

Did you add permissions to access the internet in Manifest file? Debugger is working without this permissions, but when you want to build "production" application, it requires this permissions to work.

You need to add those 2 lines:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

reference: https://developer.android.com/training/basics/network-ops/connecting