I have an Android device on Jelly Bean, and i want it to wake up when an already paired device is detected within the bluetooth range.
I guess it's a service broadcast receiver but i don't know how it should work.
Register a BroadcastReceiver to listen for BluetoothDevice.ACTION_BOND_STATE_CHANGED.
Inside a BroadcastReciever:
public void onReceive(Context context, Intent intent)
{
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(intent.getAction()))
{
int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
if (bondState == BluetoothDevice.BOND_BONDED)
{
// wake up
}
}
}
Related
Phone A has mobile data ON and is sharing internet via Wi-Fi hotspot to Phone B. If Mobile Data is TURNED OFF in phone A, no connectivity change is received #PhoneB. How can I get this change in Phone B when mobile data is turned ON/OFF in Phone A?
Phone B is Android phone.
Yes there is. Simply register BroadcastReceiver for connectivity changes:
#Override
public void register(Context context) {
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (isOnline()) {
if (listener != null) {
listener.onConnected();
}
hideNoConnectionError();
} else {
showNoConnectionError();
}
}
};
final IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
context.registerReceiver(receiver, intentFilter);
}
and on change event check whatever connectivity change there was
I'm writing an Android application in which I'd like to programmatically bond to a custom BLE device. I have the manual bonding working in which the user enters the PIN using the standard Android Bluetooth pairing dialog, but I have not been able to find any information on how to automatically bond a BLE device programatically, without user intervention. Is that possible? If so, what's the process?
I was able to make this work MOST OF THE TIME by registering a BroadcastReceiver to receive the BluetoothDevice.ACTION_BOND_STATE_CHANGED intent and then calling BluetoothDevice.setPin after receiving the BluetoothDevice.BOND_BONDING message. As is the case with most BLE things in Android, this seems to act slightly differently depending on the device and Android version. Unfortunately, I can't seem to stop Android from also receiving the bluetooth intent, so the PIN entry screen still pops up for a second before the bonding is completed.
private final BroadcastReceiver mReceiver = new BroadcastReceiver()
{
#Override
public void onReceive(Context context, Intent intent)
{
final String action = intent.getAction();
Logger("Broadcast Receiver:" + action);
if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED))
{
final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);
if(state == BluetoothDevice.BOND_BONDING)
{
Logger("Bonding...");
if (mDevice != null) {
mDevice.setPin(BONDING_CODE.getBytes());
Logger("Setting bonding code = " + BONDING_CODE);
}
}
else if(state == BluetoothDevice.BOND_BONDED)
{
Logger("Bonded!!!");
mOwner.unregisterReceiver(mReceiver);
}
else if(state == BluetoothDevice.BOND_NONE)
{
Logger("Not Bonded");
}
}
}
};
I managed to do this - see my answer here.
The TL;DR is: forget about ACTION_BOND_STATE_CHANGED; you don't need it. Instead listen to ACTION_PAIRING_REQUEST, and set the priority high. In the broadcast receiver when you get ACTION_PAIRING_REQUEST, call setPin() with your PIN and then abortBroadcast() to prevent the system showing the notification.
All you can do to avoid user interaction is to force Just Works pairing. To do that, program the peripheral to accept pairing with NoInputNoOutput IO Capability.
I have registered a BroadcastReceiver to receive ACTION_HEADSET_PLUG which works fine for most devices, ie it is called whenever the headset is plugged or unplugged. But on others eg the ZTE T815, the Intent is never sent/received when the headset is plugged/unplugged.
For reference here is the code for the receiver registration:
private final BroadcastReceiver headsetPlugReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
Log.d(TAG, "Received intent=" + intent);
if (intent.getAction().equalsIgnoreCase(Intent.ACTION_HEADSET_PLUG)) {
// do stuff
}
}
};
public void onCreate(Bundle savedState) {
super.onCeate(savedState);
// ...
registerReceiver(headsetPlugReceiver, new IntentFilter(Intent.ACTION_HEADSET_PLUG));
}
Further info:
The Intent is dispatched but only after the HEADSET_HOOK command is fired on the headset.
And when the Intent is dispatched
final int microphone = intent.getIntExtra("microphone", 0);
always returns 0 (ie no microphone).
So
Is there some config/code that can force the delivery of this
Intent?
How do I get the Intent to correctly report whether a
microphone exists or not?
It turns out the ZTE T815 has an OMTP TRRS config for its audio socket instead of CTIA/AHJ like every other modern Android device.
See http://en.wikipedia.org/wiki/Phone_connector_%28audio%29
A sad state of affairs, especially when trying to use audio feed inpout across products.
Im currently working on a android application.
I have to notify the user whenever the bluetooth of the device is turned off while the application is currently running.
How to notify the remote device that BT is turned off?
Register BroadcastReceiver with intent action BluetoothAdapter.ACTION_STATE_CHANGED and move your notifiyng code into onReceive method. Don't forget to check if new state is OFF
if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
if(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1)
== BluetoothAdapter.STATE_OFF)
// Bluetooth was disconnected
}
If you want to detect when the user is DISCONNECTING his Bluetooth, and later, detect when the user has his Bluetooth DISCONNECTED, you should do the following steps:
1) Get the user BluetoothAdapter:
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
2) Create and configure your Receiver, with a code as this:
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// It means the user has changed his bluetooth state.
if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) {
// The user bluetooth is turning off yet, but it is not disabled yet.
return;
}
if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) {
// The user bluetooth is already disabled.
return;
}
}
}
};
3) Register your BroadcastReceiver into your Activity:
this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
In android how can my Activity will get to know if a Bluetooth A2DP device is connected to my device.
Is there any broadcast receiver for that?
How to write this broadcast receiver?
Starting from API 11 (Android 3.0) you can use BluetoothAdapter to discover devices connected to a specific bluetooth profile. I used the code below to discover a device by its name:
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener() {
public void onServiceConnected(int profile, BluetoothProfile proxy) {
if (profile == BluetoothProfile.A2DP) {
boolean deviceConnected = false;
BluetoothA2dp btA2dp = (BluetoothA2dp) proxy;
List<BluetoothDevice> a2dpConnectedDevices = btA2dp.getConnectedDevices();
if (a2dpConnectedDevices.size() != 0) {
for (BluetoothDevice device : a2dpConnectedDevices) {
if (device.getName().contains("DEVICE_NAME")) {
deviceConnected = true;
}
}
}
if (!deviceConnected) {
Toast.makeText(getActivity(), "DEVICE NOT CONNECTED", Toast.LENGTH_SHORT).show();
}
mBluetoothAdapter.closeProfileProxy(BluetoothProfile.A2DP, btA2dp);
}
}
public void onServiceDisconnected(int profile) {
// TODO
}
};
mBluetoothAdapter.getProfileProxy(context, mProfileListener, BluetoothProfile.A2DP);
You can do that for every bluetooth profile. Take a look at Working with profiles in Android's guide.
However, as written in other answers, you can register a BroadcastReceiver to listen to connection events (like when you're working on android < 3.0).
You cannot get the list of connected devices by calling any API.
You need instead to listen to the intents ACTION_ACL_CONNECTED, ACTION_ACL_DISCONNECTED that notifies about devices being connected or disconnected.
No way to get the initial list of connected devices.
I had this problem in my app and the way I handle it (didn't find better...) is to bounce off/on the Bluetooth at application start to be sure to start with an empty list of connected devices, and then listen to the above intents.
muslidrikk's answer is broadly correct; however you can alternatively use fetchUUIDsWithSDP() and see what you get back... it's a bit of a hack though -- you'd have to know what UUIDs (capabilities) you could expect from the device, if it were turned on. And that might be difficult to guarantee.
For BluetoothHeadset specifically, you can call getConnectedDevices() to get connected devices for this specific profile.
Reference: http://developer.android.com/reference/android/bluetooth/BluetoothHeadset.html
Other cases you need to register a receiver for that.
In your activity, define broadcast receiver...
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
}
};
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy