Develop Reference

Getting 'Provider is not enabled | ProviderError{provider='network'}' on calling 'tracker.startListening();' even when WiFi is enabled

I'm using this library and trying to retrieve current location coordinates like this:
settings =
new TrackerSettings()
.setUseGPS(false)
.setUseNetwork(true)
.setUsePassive(true)
.setTimeBetweenUpdates(30 * 60 * 1000);
tracker = new LocationTracker(getBaseContext(), settings) {
#Override
public void onLocationFound(Location location) {
// Do some stuff
currentLatDouble = location.getLatitude();
currentLngDouble = location.getLongitude();
}
#Override
public void onTimeout() {
}
};
tracker.startListening();
but, I'm getting this error:
W/LocationTracker: Provider (network)
fr.quentinklein.slt.ProviderError: Provider is not enabled | ProviderError{provider='network'}
Isn't WiFi a network provider or do I need to write some code related to LocationManager too?
Please let me know what is wrong here.

Added the following permission in manifest file
<uses-permission android:name="android.permission.INTERNET" />
Allows applications to open network sockets.
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
Allows an app to access approximate location.
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Allows an app to access precise location.
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
Allows applications to access information about networks.
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
Allows applications to access information about Wi-Fi networks.
Additionally
<uses-feature
android:name="android.hardware.location.network"
android:required="false" />
<uses-feature
android:name="android.hardware.location.gps"
android:required="false" />

WebRTC error inside Chromium WebView: "CheckMediaAccessPermission: Not supported"

I'm trying to show WebRTC chat in WebView.
According to this documentation, WebView v36 supports WebRTC. For my test I'm using a device with Chrome/39.0.0.0 and I have added permissions to the AndroidManifest.xml file:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<user-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
but when I enter into the chat, I see a Chromium error log (device doesn't show \ translate anything, only 'loading' progress bar):
W/AudioManagerAndroid: Requires MODIFY_AUDIO_SETTINGS and RECORD_AUDIO
W/AudioManagerAndroid: No audio device will be available for recording
E/chromium: [ERROR:web_contents_delegate.cc(178)] WebContentsDelegate::CheckMediaAccessPermission: Not supported.
E/chromium: [ERROR:web_contents_delegate.cc(178)] WebContentsDelegate::CheckMediaAccessPermission: Not supported.
W/AudioManagerAndroid: Requires MODIFY_AUDIO_SETTINGS and RECORD_AUDIO
W/AudioManagerAndroid: No audio device will be available for recording
D/ChromiumCameraInfo: Camera enumerated: front
Tested on a real device, Android 5.1.1.

additional request for permissions is needed
webView.setWebChromeClient(new WebChromeClient(){
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
#Override
public void onPermissionRequest(final PermissionRequest request) {
request.grant(request.getResources());
}
});
update but it not working for audio capture
UPDATE found working google-sample code here

You need these permissions to access Camera and Microphone
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="true"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
// don't miss this one
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
Next you need to grant permissions to your webview, check this link for more details:
webView.setWebChromeClient(new WebChromeClient(){
#Override
public void onPermissionRequest(PermissionRequest request) {
runOnUiThread(() -> {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
String[] PERMISSIONS = {
PermissionRequest.RESOURCE_AUDIO_CAPTURE,
PermissionRequest.RESOURCE_VIDEO_CAPTURE
};
request.grant(PERMISSIONS);
}
});
}
});
If audio playback is not working, use this:
webView.getSettings().setMediaPlaybackRequiresUserGesture(false);

My experience with this in 2022:
CAMERA and RECORD_AUDIO permissions need to be declared in Manifest
setWebChromeClient.onPermissionRequest should check if those permissions have already been granted. If not, use registerForActivityResult(new RequestMultiplePermissions()) to ask the user to grant them.

its mostly error in webview reload becuase when we will request for audio , camera permission on webview , after accept permission , we need to refresh the webpage.
if (permission.equals("android.webkit.resource.AUDIO_CAPTURE")) {
demandForPermission(request.getOrigin().toString(), Manifest.permission.RECORD_AUDIO, MY_PERMISSIONS_REQUEST_RECORD_AUDIO);
} else {
myRequest.grant(request.getResources());
}
I also stuck this problem for many days but after in below link code , 100% working code Android Webview

How to implement scanning of barcode from gallery in android

Here is what i have tried.
I have implemented Zbar Scanner in android application in which I can scan barocde and get result.
I have implemented this in my android project. now I want to implement scanner which scans images(of course Bar code images) from gallery. I know this can be possible anyhow. check this link. It has barcode image scanning.
I have tried to search it out but failed. Please Help me out.

This is possible now with the new Barcode Scanning Apis available from Google Play Services 7.8 version. It has method to detect barcode passed as a bitmap.
Get path of image from gallery and convert it to bitmap and pass it like below:
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context)
.build();
if(barcode.isOperational()){
SparseArray<Barcode> sparseArray = barcodeDetector.detect(frame);
if(sparseArray != null && sparseArray.size() > 0){
for (int i = 0; i < sparseArray.size(); i++){
Log.d(LOG_TAG, "Value: " + sparseArray.valueAt(i).rawValue + "----" + sparseArray.valueAt(i).displayValue);
Toast.makeText(LOG_TAG, sparseArray.valueAt(i).rawValue, Toast.LENGTH_SHORT).show();
}
}else {
Log.e(LOG_TAG,"SparseArray null or empty");
}
}else{
Log.e(LOG_TAG, "Detector dependencies are not yet downloaded");
}
In your build.gradle file, include the following under dependencies section:
compile 'com.google.android.gms:play-services:7.8.+'
Following Manifest permissions are must:
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Meta data for google play services:
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
Meta data for first time install/run time dependencies to be downloaded for getting barcode detector operational.
<meta-data
android:name="com.google.android.gms.vision.DEPENDENCIES"
android:value="barcode" />
For detailed usage of this api, Refer Github Sample, follow Code Lab, Documentation.

How implement the VOIP application using android.net.rtp package

I am trying to implemented the VoIP application using the AudioGroup and AudioStream classes of the android.net.rtp package. But my application not function properly. After "Join" the "AudioGroup" class object with the "AudioStream" object, its send udp packets successfully. I checked that using the packet analyzer. But voice is not hear from the phone. I run my application in 2 phones and try communicate voice between them.
In below I mention my source code.
public class MainActivity extends Activity {
private AudioStream audioStream;
private AudioGroup audioGroup;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
audioGroup = new AudioGroup();
audioGroup.setMode(AudioGroup.MODE_NORMAL);
audioStream = new AudioStream(InetAddress.getByAddress(new byte[] {(byte)192, (byte)168, (byte)1, (byte)4 }));
audioStream.setCodec(AudioCodec.PCMU);
audioStream.setMode(RtpStream.MODE_NORMAL);
audioStream.associate(InetAddress.getByAddress(new byte[] {(byte)192, (byte)168, (byte)1, (byte)2 }), 5004);
audioStream.join(audioGroup);
AudioManager Audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
Audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
}
catch (SocketException e) { e.printStackTrace();}
catch (UnknownHostException e) { e.printStackTrace();}
catch (Exception ex) { ex.printStackTrace();}
}
I set this permissions in the Manifestfile.
<uses-permission android:name="android.permission.USE_SIP" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-feature android:name="android.hardware.sip.voip" android:required="true" />
<uses-feature android:name="android.hardware.wifi" android:required="true" />
<uses-feature android:name="android.hardware.microphone" android:required="true" />
I am using the Samsung GALAXY S3 phone with Android 4.0 OS

The trick is to get the port mapping correct. You need to use the port number from audioStream.getLocalPort() and send this port number to the peer in the SDP packet as SIP signalling.
Check out this example application which implements sip functionality
https://github.com/Mobicents/restcomm-android-sdk/tree/master/Examples/JAIN%20SIP

I used the same code you submitted, and got it working with minor changes. Basically i found the problem was getting the port number correct.
When creating the audioStream the port number seems to be random. At Android developer I found: Note that the local port is assigned automatically to conform with RFC 3550.
What I did was I started the application on one phone first and used audioStream.getLocalPort() to find the port number. Then I connected to this port using the other one. This resulted in two-way communication, even if i only had the correct port number on one phone.
Hope this helps.

I think you should set the speaker on!
Maybe you can use the following method:
audioManager.setSpeakerphoneOn(true);

Android Add <uses-feature> in Manifest

I am pretty confused where to add the
uses-feature
tag in the manifest.
I am using the camera in my app. I added permission but I'm confused where to add features in order to use front facing camera. Can you help?

Add this under <manifest> tag, like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lalllala">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-feature android:name="android.hardware.camera" />
<application android:icon="#drawable/icon" android:label="lalla" android:debuggable="true">
</application>
</manifest>

<uses-feature> - Declares a single hardware or software feature that is used by the application.
The purpose of a declaration is to inform any external entity of the set of hardware and software features on which your application depends. The element offers a required attribute that lets you specify whether your application requires and cannot function without the declared feature, or whether it prefers to have the feature but can function without it. Because feature support can vary across Android devices, the element serves an important role in letting an application describe the device-variable features that it uses.
read for more
Below is sample code to access Device Front Camera
public Camera openFrontFacingCamera() {
int cameraCount = 0;
Camera ffCam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
// Find the total number of cameras available
cameraCount = Camera.getNumberOfCameras();
// Find the ID of the CAMERA_FACING_FRONT & open it
for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
ffCam = Camera.open(camIdx);
} catch (RuntimeException e) {
Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return ffCam;
}
Need following permissions
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-feature android:name="android.hardware.camera.front" android:required="false" />
For more please read Google android developer API doc Camera, Camera.CameraInfo

Add this under manifest tag:
<!-- Request the camera permission -->
<uses-permission
android:name="android.permission.CAMERA" />
<uses-feature
android:name="android.hardware.camera"
android:required="true" />

write tags order like this
<manifest>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<application>
</application>
</manifest>