I just cannot get Android to scan for Bluetooth devices. I've tried several different approaches, but none of them work. Here is my latest code.
// Create a BroadcastReceiver for ACTION_FOUND.
devicesFoundReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Discovery has found a device. Get the BluetoothDevice
// object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
devicesListArray.add(deviceName + "\n" + deviceHardwareAddress);
arrayAdapter.notifyDataSetChanged();
}
}
};
I register the receiver like this:
_thisContext.registerReceiver(devicesFoundReceiver, filter);
My manifest has these permissions:
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
I call
bluetoothAdapter.startDiscovery();
OnReceive on the broadcastreceiver NEVER fires.
I'm tired of looking at bajillion different websites, some with the same approach, other's don't. But NONE of them work. What am I doing wrong?
Here is the SDK version for reference:
minSdkVersion 26
targetSdkVersion 30
The Bluetooth related actions of mobile phones have nothing to do with net. Your problems are generally caused by the lack of authorized location permissions. When targetsdkversion 23 or above, you need to dynamically request mobile location permission“ android.permission.ACCESS_ FINE_ Location "can search for Bluetooth devices nearby. Of course, you can reduce the targetsdkversion version of the project to below 23. In this way, you do not need to apply for permission dynamically.
Here are some good dynamic permission application open source library, I hope to help you：
https://github.com/googlesamples/easypermissions
https://github.com/permissions-dispatcher/PermissionsDispatcher
Related
Good afternoon. For a very long time I have been trying to get a list of wi-fi networks using WifiManager. When I try to get through a virtual device, I get only one fictional network with an SSID: Android Wifi. However, I do not receive networks from my real environment. When using a real device, it is not possible to get any network.
What is the mistake?
Rights in AndroidManifest:
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
The code I use to work with Wifi:
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifiManager.startScan();
List<ScanResult> availNetworks = wifiManager.getScanResults();
Log.d("STRING",Integer.toString(availNetworks.size()));
if (availNetworks.size() > 0) {
for (int i=0; i< availNetworks.size();i++) {
String buf = availNetworks.get(i).toString();
String[] buflist = buf.split(",");
Log.d("STRING","In");
String elementWssid = buflist[0];
String elementWsec = buflist[2];
String elementWlevel = buflist[3];
String SSID = elementWssid.split(": ")[1];
String Sec = elementWsec.split(": ")[1];
String level = elementWlevel.split(": ")[1];
Log.d("STRING",SSID);
Log.d("STRING",Sec);
Log.d("STRING",level);
}
}
Permits have already been issued.
Solved a problem. In the application settings there is such a section as "other permissions". It contains permissions to work with wi-fi, which by default are in the "ask" status, after changing the status to "allow" the problem was solved. For some reason, android doesn't feel the need to ask for permissions like location.
P.s.
Xiaomi has a separate slider to access the location of ALL apps, it needs to be turned on to give permissions.
AndroidWifi on a virtual device is a test network for checking the performance of applications, since it does not know how to work with real networks.
I would like to enable bluetooth with my app without user interaction, the prompt does not appear on my devices - Android 7, 8 & 9, and my friend's Android 10. But it appears in my work colleague's devices (Android 10).
I used the following permissions
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
And used the following Bluetooth Adaptor methods.
bluetoothAdapter.enable();
bluetoothAdapter.disable();
I have no intent ACTION_REQUEST_ENABLE or ACTION_REQUEST_DISABLE in my source code.
Am I missing some permissions or methods?
Or is this an environment problem?
Any advise on how should I handle this would be much appreciated.
Thank you.
bluetoothAdapter.enable() will directly run com.android.settings/.bluetooth.RequestPermissionHelperActivity, and you should listen for ACTION_STATE_CHANGED yourself.
I think use the BluetoothAdapter.ACTION_REQUEST_ENABLE is a better way, which will first run com.android.settings.bluetooth.RequestPermissionActivity and then RequestPermissionHelperActivity. RequestPermissionActivity will listen for ACTION_STATE_CHANGED, while your app only need the result code of Activity.RESULT_OK.
private boolean ensureBluetoothEnabled() {
if(((BluetoothManager) Objects.requireNonNull(getSystemService(Context.BLUETOOTH_SERVICE)))
.getAdapter().isEnabled()) {
return true;
} else {
Intent btIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
btIntent.putExtra(Intent.EXTRA_PACKAGE_NAME, Constants.PACKAGE);
startActivityForResult(btIntent, REQUEST_CODE_BL_OPEN);
return false;
}
}
I am making a android game in which user can play game using hotspot connectivity like the share it app connect the two user using hotspot.I searched on google but they only show list of wifi network but i only want to show the available hotspot in near by.Please help me guys.I am stuck in this from three days.
You need to create a BroadcastReceiver to listen for Wifi scan results:
private final BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context c, Intent intent) {
if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
List<ScanResult> mScanResults = mWifiManager.getScanResults();
// add your logic here
}
}
}
In onCreate() you would assign mWifiManager and initiate a scan:
mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
registerReceiver(mWifiScanReceiver,
new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mWifiManager.startScan();
getScanResults() will return data only if you have appropriate permissions. For this, add one of the following two lines to your AndroidManifest.xml:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
Also note that in API 23+, permissions must be requested at runtime. (For a lab environment, you can also grant permissions manually in Settings instead—less coding required, but not recommended for an end-user app.)
Note that the code which handles your scan results would run every time a new scan result is available, updating the result.
I am using this code to get MAC ADDRESS and display it in my app. The code works fine for all devices except most latest devices and ANDROID BOX.
it shows null for ANDROID BOX and other latest device.
Here is code:
public static String getWifiMacAddress() {
try {
String interfaceName = "wlan0";
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
if (!intf.getName().equalsIgnoreCase(interfaceName)){
continue;
}
byte[] mac = intf.getHardwareAddress();
if (mac==null){
return "";
}
StringBuilder buf = new StringBuilder();
for (byte aMac : mac) {
buf.append(String.format("%02X:", aMac));
}
if (buf.length()>0) {
buf.deleteCharAt(buf.length() - 1);
}
return buf.toString();
}
} catch (Exception ex) { } // for now eat exceptions
return "";
}
I have written these permissions in manifest file
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
Firstly u will check the permission is granted or not?
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wInfo = wifiManager.getConnectionInfo();
String macAddress = wInfo.getMacAddress();
Also, add below permission in your manifest file
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
Please refer this link for 6.0 marshmalow
First you will need to add Internet user permission in AndroidManifest.xml.
<uses-permission android:name="android.permission.INTERNET" />
and then Refer this to get mac address: http://robinhenniges.com/en/android6-get-mac-address-programmatically
And if it doesn't works then refer this Android 6.0 changes
from this i have concluded that,
To provide users with greater data protection, starting in this
release, Android removes programmatic access to the device’s local
hardware identifier for apps using the Wi-Fi and Bluetooth APIs. The
WifiInfo.getMacAddress() and the BluetoothAdapter.getAddress() methods
now return a constant value of 02:00:00:00:00:00.
To access the hardware identifiers of nearby external devices via
Bluetooth and Wi-Fi scans, your app must now have the
ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permissions.
Note That : you can't get your own MACs even having those permissions. Read carefully, It is said that you can get other devices MACs having those permissions, but not your own.
As in 6.0 and above adding permission in Manifest alone wont work. You should have runtime permission and grant it if not granted.
Check this link:
https://stackoverflow.com/a/30549756/3910281
I'm currently working on a little app to get started with the services that the Bluetooth Android API can provide.
Edit -> Answer:
It seems that the issue was due to the specific Nexus 5 devices. Seems like their bluetooth receiver doesn't work well. Solution below should work for other devices
Remark:
I’ve read the documentation here: http://developer.android.com/guide/topics/connectivity/bluetooth.html
as well as the following source code of this tutorial http://www.londatiga.net/it/programming/android/how-to-programmatically-scan-or-discover-android-bluetooth-device/ located on github under /lorensiuswlt/AndroBluetooth
I’ve finished almost all the features that interested me (such as check for adapter existence, enable/disable the blueooth, querying paired divices, set the adapter discoverable).
Issue:
Actually no device is found when i launch the .onDiscovery() method, even though devices are found from Settings/Bluetooth on my Nexus 5.
Here is how I handle it:
public class MainActivity extends AppCompatActivity {
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
...
protected void onCreate(Bundle savedInstanceState) {
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
}
The filter is working well as far as i could try, i.e ACTION_STATE_CHANGED (on bluetooth enabling) and the two ACTION_DISCOVERY_***.
The following method is then successfuly called:
public void onDiscovery(View view)
{
mBluetoothAdapter.startDiscovery();
}
And then i have my bluetooth receiver:
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
if (state == BluetoothAdapter.STATE_ON) {
showToast("ACTION_STATE_CHANGED: STATE_ON");
}
}
else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
mDeviceList = new ArrayList<>();
showToast("ACTION_DISCOVERY_STARTED");
mProgressDlg.show();
}
else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action) && !bluetoothSwitchedOFF) {
mProgressDlg.dismiss();
showToast("ACTION_DISCOVERY_FINISHED");
Intent newIntent = new Intent(MainActivity.this, DeviceListActivity.class);
newIntent.putParcelableArrayListExtra("device.list", mDeviceList);
startActivity(newIntent);
}
else if (BluetoothDevice.ACTION_FOUND.equals(action)) {// When discovery finds a device
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mDeviceList.add(device);
showToast("Device found = " + device.getName());
}
}
};
I don't have any issue coming out the logcat and didn't notice any trouble during the test I did. The only problem is that no device is discovered at the end of the scan, when many discoverable ones are available arround.
I tried to not put too much code in order to not flood the topic. Ask me if you need more.
Thanks for reading me, and thanks in advance for you answers.
What version of Android are you running this on? If it is Android 6.x, I believe you need to add the ACCESS_FINE_LOCATION permission to your manifest. For example:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
I had a similar issue and this fixed it for me.
UPDATE: Adding documentation direct from Google on this:
To access the hardware identifiers of nearby external devices via Bluetooth and Wi-Fi scans, your app must now have the ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permissions
UPDATE 2020: We recently updated our application to target SDK Version 29. In doing this, our application stopped being able to discover Bluetooth devices again. We have been using ACCESS_COARSE_LOCATION since this answer was originally written. Changing to ACCESS_FINE_LOCATION appears to fix the issue. I now recommend developers try ACCESS_FINE_LOCATION if targeting 29+. Answer updated to reflect this.
Bit late to the party but this may come in handy for other people.
You need to do two things
Add <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
or <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
to your AndroidManifest.xml
Make sure you're requesting the permission on runtime as well for Android 6.0 Devices by using something like this
int MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION = 1;
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION);
just before mBluetoothAdapter.startDiscovery();
If you don't do step 2 you won't be able to get any Hardware Identifier info on device with Android >= 6.0
UPDATE/EDIT:
Example with Android Version check and alert dialog as warning
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { // Only ask for these permissions on runtime when running Android 6.0 or higher
switch (ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.ACCESS_COARSE_LOCATION)) {
case PackageManager.PERMISSION_DENIED:
((TextView) new AlertDialog.Builder(this)
.setTitle("Runtime Permissions up ahead")
.setMessage(Html.fromHtml("<p>To find nearby bluetooth devices please click \"Allow\" on the runtime permissions popup.</p>" +
"<p>For more info see here.</p>"))
.setNeutralButton("Okay", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if (ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(DeviceListActivity.this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
REQUEST_ACCESS_COARSE_LOCATION);
}
}
})
.show()
.findViewById(android.R.id.message))
.setMovementMethod(LinkMovementMethod.getInstance()); // Make the link clickable. Needs to be called after show(), in order to generate hyperlinks
break;
case PackageManager.PERMISSION_GRANTED:
break;
}
}
As with new android version things are changed a bit
Older android version like android 10 needs FINE_LOCATION where as newer android version like android 12 works with COARSE_LOCATION also. hence my advice is to ask for FINE_LOCATION permission which will work in both. don't ask COAR_LOCATION and FINE_LOCATION simultaneously otherwise it will not work with android 12 and greater if user select coarse location at app start up.