Develop Reference

No permissions found in Manifest [Android]

I have been trying various ways to call on my location data ranging from IP location API's to Flutter plugin's but have not been able to get accurate location data for any of them. Through all I have settled onto Geolocator. But I kept getting
I/flutter ( 5206): null
I/flutter ( 5206): GeolocationStatus.unknown
When calling it in my Init state as follows:
void initState() {
super.initState();
fetchData();
}
fetchData() async {
setState(() {
isLoading = true; //Data is loading
});
GeolocationStatus geolocationStatus =
await Geolocator().checkGeolocationPermissionStatus();
position = await Geolocator()
.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
if (position != null) {
lastPosition = await Geolocator()
.getLastKnownPosition(desiredAccuracy: LocationAccuracy.high);
}
...
if (position != null)
print(position);
else
print(lastPosition);
print(geolocationStatus);
setState(() {
isLoading = false; //Data has loaded
});
}
After some research I decided to settle on permission_handler to try to check permissions. I declared PermissionStatus _status added the following lines to my fetchData() function:
PermissionHandler()
.checkPermissionStatus(PermissionGroup.location);
To which I get No permissions found in manifest for: 3
My manifest has the permissions to the best of my understanding. Manifest file: https://gist.github.com/Purukitto/640d1637c05bdb1b69cc4309947c45d5
From what I understand adding the permissions to the Manifest should add the permission option at least to the app, but after building and installing the app there are "No permissions" for my app(Screenshot attached).
What could be the problem. I have tried to mention all relevant things. Any insight will be really helpful.

This question is linked in the Flutter package permission_handler's ReadMe as an example of setting up the AndroidManifest.xml for asking permissions.
If you're having issues with the device asking the user for permissions, this may be your culprit.
To elaborate on rollcake's answer:
1. If you don't know what permissions you need yet, go to the Android Developer page to see the list and the syntax(es).
2. In your project, open: android/app/src/main/AndroidManifest.xml
3. Insert your permissions as shown in this example here:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.your.package">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name="io.flutter.app.FlutterApplication"
...<and so on>...
Just a side note: There are different AndroidManifest.xml files in your project (...src/debug, ...src/profile, and ...src/main). Adding the permissions to the main version described above should work but if you're noticing inconsistent behavior make sure you're putting all of your permissions in the same AndroidManifest file.

Check for targetSdkVersion is 23 if so then check for runtime permission you can use checkSelfPermission() and requestPermissions() for android 6 and above

open android project in flutterProject
click manifests file
insert permission
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

1. Add them in AndroidMenifest.xml
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="30"></uses-permission>
<uses-permission android:name="com.google.android.gms.permission.AD_ID"></uses-permission>
<uses-permission android:name="android.permission.READ_MEDIA_IMAGES"></uses-permission>
<uses-permission android:name="android.permission.READ_MEDIA_VIDEO"></uses-permission>
<uses-permission android:name="android.permission.READ_MEDIA_AUDIO"></uses-permission>
2. Update permissions handler package :
Package link : https://pub.dev/packages/permission_handler

How can I get GPS Location of my device in Xamarin Forms?

I want to get the Longitude and Latitude of my device when the entry box named entLocation is focused. I am using Xamarin.Essential Geolocation to get the GPS location of my device I followed the documentation and tutorials and still I am unable to get the GPS Location. I have added permission below to my android manifest still nothing. I am getting an display alert on "Error3", Error3 is the exception when Unable to get location.
The error is "Java.Lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Activity.requestPermissions(java.lang.String[],int)' on a null object reference"
My questions:
1. What is my error in my code?
2. Can I get my gps location offline? If yes, how can I achieve that?
uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
uses-feature android:name="android.hardware.location" android:required="false"
uses-feature android:name="android.hardware.location.gps" android:required="false"
uses-feature android:name="android.hardware.location.network" android:required="false"
private async void entLocation_FocusedAsync(object sender, FocusEventArgs e)
{
try
{
var request = new GeolocationRequest(GeolocationAccuracy.Medium);
var location = await Geolocation.GetLocationAsync(request);
if (location != null)
{
entLocation.Text = location.Longitude.ToString() + "," + location.Latitude.ToString();
}
}
catch (FeatureNotSupportedException fnsEx)
{
await DisplayAlert("Error1", fnsEx.ToString(), "ok");
}
catch (PermissionException pEx)
{
await DisplayAlert("Error2", pEx.ToString(), "ok");
}
catch (Exception ex)
{
await DisplayAlert("Error3", ex.ToString(), "ok");
}
}

I am also working on my first Xamarin project that requires location permissions. A couple of things you should try that may help you get GPS location.
My suggestions
1) You need to grant additional permissions in AndroidManifest file. These are
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
2) Since Android 6.0 or above, you need to have runtime permissions. To acchieve that, you need to override OnStart() method in your MainActivity.cs. I referenced to Location permission for Android above 6.0 with Xamarin.Forms.Maps. Here is what I did
protected override void OnStart()
{
base.OnStart();
if(CheckSelfPermission(Manifest.Permission.AccessCoarseLocation) != (int)Permission.Granted)
{
RequestPermissions(new string[] { Manifest.Permission.AccessCoarseLocation, Manifest.Permission.AccessFineLocation }, 0);
}
}
Important: My solution here is just temporarily handle granting permissions. Visual Studio would show an exception when you build and run the project first time. After you choose "allow" from "Allow access location?" prompt on the device, you would not get the exception when run the project again. I have not handled this issue yet.
My limits
As I said, the problem isn't completely solved. My answer is to help you temporarily solve location permissions issue and move on. And I don't know how to get location offline.

Changing Android hotspot settings

With the release of API level 26, my app's core functionality broke, this being, changing the users' hotspot setting within the application.
To get and set this configuration I am using the following functions from the WifiManager hidden api: getWifiApConfiguration and setWifiApConfiguration.
Method getWifiApConfiguration = wifiManager.getClass().getMethod("getWifiApConfiguration");
getWifiApConfiguration.invoke(wifiManager);
This is working with devices prior to Android O, but in this version I get the following error:
App not allowed to read or update stored WiFi Ap config (uid = 10168)
The permissions I have declared in the manifest are:
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.NETWORK_STACK"/>
<uses-permission android:name="android.permission.TETHER_PRIVILEGED" />
How can I do this with the latest APIs?

As of Android Oreo (26), a new permission check was added to the service implementation of the getWifiApConfiguration() method:
Snippet from WifiServiceImpl.java
/**
* see {#link WifiManager#getWifiApConfiguration()}
* #return soft access point configuration
* #throws SecurityException if the caller does not have permission to retrieve the softap
* config
*/
#Override
public WifiConfiguration getWifiApConfiguration() {
enforceAccessPermission();
int uid = Binder.getCallingUid();
// only allow Settings UI to get the saved SoftApConfig
if (!mWifiPermissionsUtil.checkConfigOverridePermission(uid)) {
// random apps should not be allowed to read the user specified config
throw new SecurityException("App not allowed to read or update stored WiFi Ap config "
+ "(uid = " + uid + ")");
}
mLog.trace("getWifiApConfiguration uid=%").c(uid).flush();
return mWifiStateMachine.syncGetWifiApConfiguration();
}
Digging into the code you will quickly find out that to successfully invoke this method your application must hold the android.permission.OVERRIDE_WIFI_CONFIG permission that is a system level protected permission:
Snippet from framework AndroidManifest.xml
<!-- #SystemApi #hide Allows an application to modify any wifi configuration, even if created
by another application. Once reconfigured the original creator cannot make any further
modifications.
<p>Not for use by third-party applications. -->
<permission android:name="android.permission.OVERRIDE_WIFI_CONFIG"
android:protectionLevel="signature|privileged" />
This means that your application needs to be signed by the platform key or be privileged to use this API.

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.