app/src/main/java/com/javispedro/autobluetether/BtConnectReceiver.java


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package com.javispedro.autobluetether;

import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.Log;

import java.util.Set;

public class BtConnectReceiver extends BroadcastReceiver {
    private static final String TAG = "BtConnectReceiver";

    private boolean isDeviceEnabled(Context context, BluetoothDevice device) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        Set<String> enabledAddresses = prefs.getStringSet(context.getString(R.string.prefs_key_device_list), null);
        if (enabledAddresses == null) return false;
        Log.d(TAG, "enabled devices in prefs: " + enabledAddresses);
        return enabledAddresses.contains(device.getAddress());
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (action == null) return;

        if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (device == null) return;

            Log.d(TAG, "ACL connected: " + device.getName());

            if (isDeviceEnabled(context, device)) {
                Log.d(TAG, "trying to enable tethering");
                try {
                    new BtTetherEnabler(context).startTethering();
                } catch (BtTetherEnabler.EnableException e) {
                    e.printStackTrace();
                    Log.e(TAG, "Can't enable tethering: " + e.getMessage());
                }
            }
        }
    }
}