BluetoothDevice

今天照著Android Developer的網址測試老半天，終於試出搜尋藍芽設備的功能了，一切感謝於StackOverflow的存在。
結果因為手機Android版本是6.0
所以要多加兩個步驟.

步驟一

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


  to your manifest.xml

步驟二

int MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION = 1; 
ActivityCompat.requestPermissions(this,
        new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
        MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION);

引用來源:

https://stackoverflow.com/questions/34966133/android-bluetooth-discovery-doesnt-find-any-device/36177638#36177638?newreg=854649a9202343e998e23d78f0d2028e