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copied!<p>What problem are you having? My guess is that you need to add both the BLUETOOTH and BLUETOOTH_ADMIN permissions to your app.</p> <p>Note that the preferred solution is to use an intent to prompt is the user wants to enable bluetooth:</p> <pre><code> Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivity(enableIntent); </code></pre> <p>Also note that the call to <code>enable</code> is asynchronous, it will return immediately and enable Bluetooth in the background. Hence Bluetooth may not actually be enabled yet, it may still be getting ready. See also <a href="http://developer.android.com/guide/topics/connectivity/bluetooth.html" rel="nofollow">the Android guidelines on Bluetooth</a></p> <p><strong>EDIT</strong> added disable/wait/enable/wait sample code</p> <p>This is sample code for requesting Bluetooth to turn off, then waiting for it to turn on. It <strong>must</strong> be run in a separate thread and <strong>not</strong> in the UI thread. It would be possible to encapsulate this in a <code>Runnable</code> Class which sets a (preferably <code>volatile</code>) flag to to true if it completes successfully.</p> <p><strong>Note:</strong> this sample code is known to have issues on some older devices that do not allow diable/enable to be called from user applications. </p> <pre><code> BluetoothAdapter.getDefaultAdapter().disable(); while (BluetoothAdapter.getDefaultAdapter().isEnabled()) { try { Thread.sleep(100L); } catch (InterruptedException ie) { // unexpected interruption while disabling Bluetooth Thread.currentThread().interrupt(); // restore interrupted flag return; } } // disabled, re-enabling Bluetooth BluetoothAdapter.getDefaultAdapter().enable(); while (!BluetoothAdapter.getDefaultAdapter().isEnabled()) { try { Thread.sleep(100L); } catch (InterruptedException ie) { // unexpected interruption while enabling bluetooth Thread.currentThread().interrupt(); // restore interrupted flag return; } } </code></pre>

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