Need to programmatically open bluetooth and discover devices in Android

I need to open up bluetooth through my code without asking the user to enable it and then discover all the devices in range and return those devices and th开发者_开发知识库en close bluetooth connection.

How to do it?

I suppose here is exactly what you need.

https://developer.android.com/guide/topics/connectivity/bluetooth.html#FindingDevices

https://developer.android.com/guide/topics/connectivity/bluetooth.html#DiscoveringDevices

About enabling the Bluetooth without asking the user, here is what the doc says:

Bluetooth should never be enabled without direct user consent. If you want to turn on Bluetooth in order to create a wireless connection, you should use the ACTION_REQUEST_ENABLE Intent, which will raise a dialog that requests user permission to turn on Bluetooth. The enable() method is provided only for applications that include a user interface for changing system settings, such as a "power manager" app.

But if you really want to Enable device bluetooth without asking the user. after add this:

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

permission to your Manifest use this code in your App

BluetoothAdapter.enable()