
Could you please try below.
I did not try myself but sounds similar problem if I understand correctly:

https://stackoverflow.com/questions/4472613/android-bluetooth-earpiece-volume

&quot;*Android is using int 6 for bluetooth volume and not documented.
Just use 6 instead of AudioManager.STREAM_VOICE_CALL and try, It should work*&quot;

I assume for you will be to replace AudioManager.STREAM_BLUETOOTH_SCO with 6.

Good luck, I hope it will work.


[This earlier question](https://stackoverflow.com/questions/19949526/examples-of-different-results-produced-by-the-standard-myers-minimal-patienc) asked for the differences between 4 different Git diff strategies, but the only difference that was explained was the difference between `myers` and `patience`, which is pretty well explained [elsewhere](http://alfedenzo.livejournal.com/170301.html).

How does the `histogram` strategy work? What differentiates it from `patience`? The [git-diff man page](https://www.kernel.org/pub/software/scm/git/docs/git-diff.html) only says that it &quot;extends the patience algorithm to &quot;support low-occurrence common elements&quot;.&quot; Other pages mention that it&#39;s faster, and that it comes from JGit, but they don&#39;t explain *where or how its algorithm or results will differ from `patience`*.

**Where can I find a description of the `histogram` algorithm relative to the `patience` algorithm**, with the same level of detail as [Bram Cohen&#39;s original description of the `patience` algorithm](http://bramcohen.livejournal.com/73318.html)?

(If it&#39;s just a matter of implementation performance with no case that will produce different results, why wasn&#39;t it just implemented as a new backend for `patience`?)

What&#39;s the difference between `git diff --patience` and `git diff --histogram`?

I want to check if a string contains special characters like !@#$%^&amp;*.,&lt;&gt;/\&#39;&quot;;:? and return true if the string contains atleast one of those chars.

I tried with the following regex,script:

    var format = /^[!@#$%^&amp;*()_+\-=\[\]{};&#39;:&quot;\\|,.&lt;&gt;\/?]*$/;
    
    if( string.match(format) ){
      return true;
    }else{
      return false;
    }

If the string contains only the special characters then it returns true , but if the string contains something else like alphanumeric chars ( !example1 , .example2 ) it returns false.


Check for special characters in string

I have an android device acting as a hands free client device using hfp.

[Using the following code:][1] 

I am able to receive a call and the speakers and mic are working as expected.

My problem is that I can&#39;t seem to control the volume.


I tried using the following lines of code to find the correct stream, but none of them seem to work.

I tracked the volume command being sent from the phone to the client in the class `HeadsetClientStateMachine` , line #1822 in the following link: [HeadsetClientStateMachine from lolipop][2]

    case EVENT_TYPE_VOLUME_CHANGED:
        if (event.valueInt == HeadsetClientHalConstants.VOLUME_TYPE_SPK) {
            mAudioManager.setStreamVolume(AudioManager.STREAM_BLUETOOTH_SCO, event.valueInt2, AudioManager.FLAG_SHOW_UI);
            mVgsFromStack = true;
           Log.d(TAG, &quot;EventVolumeChange STREAM_BLUETOOTH_SCO value: &quot; + event.valueInt2);
        }

When I change the volume on the phone, I do see the log showing the updated value of the sound, which means that the `setStreamVolume()` method is being called, but the volume doesn&#39;t change.

Does anyone know what could be causing this issue?


**EDIT:**

I am still looking for an answer and am now looking toward the audio HAL implementation. I suspect that the link between the HAL and the audio driver is somehow incorrect... I don&#39;t know much about low level implementation and am not sure what I should be looking for.


  [1]: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/5.0.0_r1/com/android/bluetooth/hfpclient/
  [2]: http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android-apps/5.0.0_r1/com/android/bluetooth/hfpclient/HeadsetClientStateMachine.java/?v=source

Bluetooth hands free client volume control

I have an android device acting as a hands free client device using hfp.
<a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/5.0.0_r1/com/android/bluetooth/hfpclient/" target="_blank" rel="noopener noreferrer">Using the following code:</a>
I am able to receive a call and the speakers and mic are working as expected.
My problem is that I can't seem to control the volume.
I tried using the following lines of code to find the correct stream, but none of them seem to work.
I tracked the volume command being sent from the phone to the client in the class <code>HeadsetClientStateMachine</code> , line #1822 in the following link: <a href="http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android-apps/5.0.0_r1/com/android/bluetooth/hfpclient/HeadsetClientStateMachine.java/?v=source" target="_blank" rel="noopener noreferrer">HeadsetClientStateMachine from lolipop</a>
<pre><code class="hljs language-ini">case EVENT_TYPE_VOLUME_CHANGED:
 if (event.valueInt == HeadsetClientHalConstants.VOLUME_TYPE_SPK) {
 mAudioManager.setStreamVolume(AudioManager.STREAM_BLUETOOTH_SCO, event.valueInt2, AudioManager.FLAG_SHOW_UI);
 mVgsFromStack = true;
 Log.d(TAG, "EventVolumeChange STREAM_BLUETOOTH_SCO value: " + event.valueInt2);
 }
</code></pre>
When I change the volume on the phone, I do see the log showing the updated value of the sound, which means that the <code>setStreamVolume()</code> method is being called, but the volume doesn't change.
Does anyone know what could be causing this issue?
EDIT:
I am still looking for an answer and am now looking toward the audio HAL implementation. I suspect that the link between the HAL and the audio driver is somehow incorrect... I don't know much about low level implementation and am not sure what I should be looking for.

So Retrofit 2.0.0 was recently released and theres not really any updated examples on how to use it, but im trying to implement it for a basic API call. Im getting a 

    java.lang.IllegalArgumentException: Unable to create converter for class` 

caused by 

    Caused by: java.lang.IllegalArgumentException: Could not locate converter for class orbyt.app.dataclass. Tried:
    * retrofit.OkHttpBodyConverterFactory

When trying to make the api call.

(Retrofit) Could not locate converter for class crashing app

Whenever my device (Nexus 5, Android M Preview 3) connects via USB, the USB config always defaults to &quot;charging only&quot;. 

This is quite problematic because the USB port on my device is faulty and sometimes disconnects and reconnects when bumped and so I have to manually change the mode to MTP (media transfer protocol) from the notification drawer each time.

- Debugging mode is enabled
- Develop settings -&gt; USB Configuration is set to MTP.

How to set Android M default USB config to MTP rather than &quot;charging only&quot;?

I am working on Notifications and I have to use `setLatestEventInfo`. However, Android Studio shows the following error message: 

&gt; cannot resolve method setLatestEventinfo

Here is my code snippet:

    private void createNotification(Context context, String registrationID) {
        NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(R.drawable.icon,&quot;Registration Successfull&quot;,System.currentTimeMillis());
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        Intent intent = new Intent(context,RegistrationResultActivity.class);
        intent.putExtra(&quot;registration_ID&quot;,registrationID);
        PendingIntent pendingIntent = PendingIntent.getActivity(context,0,intent,0);
        notification.setLatestEventInfo(context,&quot;Registration&quot;,&quot;Successfully Registered&quot;,pendingIntent);
    }

Or if their is another way to do so, kindly suggest me that.

Cannot Resolve Method setLatestEventInfo

I was going through the official doc about the new Permissions model in Android M. It talks about the `shouldShowRequestPermissionRationale()` function which returns `true` if the app has requested this permission previously and the user denied the request. If the user turned down the permission request in the past and chose the Don&#39;t ask again option, this method returns `false`. 

 
But how can we differentiate between the following two cases?

&lt;b&gt;Case 1&lt;/b&gt;: The app doesn&#39;t have a permission and the user has not been asked for the permission before. In this case, shouldShowRequestPermissionRationale() will return false because this is the first time we&#39;re asking the user.

&lt;b&gt;Case 2&lt;/b&gt;: The user has denied the permission and selected &quot;Don&#39;t ask again&quot;, in this case too shouldShowRequestPermissionRationale() will return false. 

I would want to send the user to the App&#39;s settings page in Case 2. How do i go about differentiating these two cases?﻿

Android M Permissions : Confused on the usage of shouldShowRequestPermissionRationale() function

I&#39;m using Retrofit to access a RESTful api. The base url is:

&gt; http://api.example.com/service

This is the code for the interface:

    public interface ExampleService {
        @Headers(&quot;Accept: Application/JSON&quot;)
        @POST(&quot;/album/featured-albums&quot;)
        Call&lt;List&lt;Album&gt;&gt; listFeaturedAlbums();
    }

and this is how I send request and receive the responce:

    new AsyncTask&lt;Void, Void, Response&lt;List&lt;Album&gt;&gt;&gt;() {

            @Override
            protected Response&lt;List&lt;Album&gt;&gt; doInBackground(Void... params) {
                Retrofit retrofit = new Retrofit.Builder()
                        .baseUrl(&quot;http://api.example.com/service&quot;)
                        .addConverterFactory(GsonConverterFactory.create())
                        .build();

                ExampleService service = retrofit.create(ExampleService.class);

                try {
                    return service.listFeaturedAlbums().execute();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(Response&lt;List&lt;Album&gt;&gt; listCall) {
                Log.v(&quot;Example&quot;, listCall.raw().toString());
            }
        }.execute();

the log that I get is the weird thing:

&gt; V/Example﹕ Response{protocol=http/1.1, code=404, message=Not Found, url=http://api.example.com/album/featured-albums}

What&#39;s going on here?

Retrofit 2 removes characters after hostname from base url

After upgrading to Android version 6.0 Bluetooth Low Energy (BLE) scanning will only work if Location services are enabled on the device. See here for reference: https://stackoverflow.com/questions/33043582/bluetooth-low-energy-startscan-on-android-6-0-does-not-find-devices/33045489#33045489

Basically, you need to have the permission enabled for the app as well as on for the phone.  Is this a bug? Is it possible to scan without location services actually enabled? I don&#39;t want to have to have location for all my apps. 

**EDIT** 
I failed to mention that I am using the `startScan()` method in `BluetoothLeScanner` provided in API 21. I am okay with the course and fine location permissions in the manifest that this method require. I just don&#39;t want the users of my app to have to enable location services on their device (GPS, etc.) to use my app. 

Previously, the `startScan()` method would run and return results with the Location services disabled on the phone. On Marshmallow, however, the same application would &quot;scan&quot; but silently failed and returned no results when location services were not enabled on the phone and course/fine location permissions were still in the manifest.

Location needs to be enabled for Bluetooth Low Energy Scanning on Android 6.0

I want to use the Bluetooth LE functions in .NET Core (specifically, BluetoothLEAdvertisementWatcher) to write a scanner which logs information to a file. This is to run as a desktop application and preferably as a command line app.

Constructors like System.IO.StreamWriter(string) are not available, apparently. How do I create a file and write to it?

I would be just as happy to be able to do a System.Console.WriteLine(string) but that doesn&#39;t seem to be available under .NET Core either.

Update: To clarify, if I could have a program that looks like this run without error, I&#39;ll be off to the races.

    using System;
    using Windows.Devices.Bluetooth.Advertisement;

    namespace ConsoleApplication
    {
        public class Program
        {
            public static void Main(string[] args)
            {
                BluetoothLEAdvertisementWatcher watcher = new BluetoothLEAdvertisementWatcher();
                Console.WriteLine(&quot;Hello, world!&quot;);
            }
        }
    }

Update 2: Here&#39;s the project.json file:

    {
      &quot;dependencies&quot;: {
        &quot;Microsoft.NETCore.UniversalWindowsPlatform&quot;: &quot;5.0.0&quot;
      },
      &quot;frameworks&quot;: {
        &quot;uap10.0&quot;: {}
      },
      &quot;runtimes&quot;: {
        &quot;win10-arm&quot;: {},
        &quot;win10-arm-aot&quot;: {},
        &quot;win10-x86&quot;: {},
        &quot;win10-x86-aot&quot;: {},
        &quot;win10-x64&quot;: {},
        &quot;win10-x64-aot&quot;: {}
      }
    }

The output of the command `dotnet -v run` contains this error message:

    W:\src\dotnet_helloworld&gt;dotnet -v run
    ...
    W:\src\dotnet_helloworld\Program.cs(2,15): error CS0234: The type or namespace name &#39;Devices&#39; does not exist in the namespace &#39;Windows&#39; (are you missing an assembly reference?)
    ...


How to write to a file in .NET Core?

The situation goes a little something like this:

1. I am programming Xcode whilst concurrently listening to music on my Bluetooth headphones... you know to block out the world.

2. Then, I go to launch my app in the iOS simulator and BOOM all of a sudden my crystal clear music becomes garbled and super low quality like it is playing in a bathtub 2 blocks away... in the 1940s. 

3. Note: the quality deterioration does NOT occur if I am playing music on my laptop or cinema display and I launch the sim. It seems to be exclusively a Sim -&gt; Bluetooth issue. 

The problem is more than just annoying. Because often after stopping the simulator the crappy bathtub quality music continues. To fix it I have to open sound preferences in OSX and briefly toggle back to my laptop sound and then back to my Bluetooth headphones. 

This is a big deal because I launch the simulator 50x a day and have to do this toggle thing every time as well as suffer listening to 40s era mono ham radio quality music. 

For your information, the headphones I am using are Plantronics BackBeat Pro and I am up to date on firmware. I am on OSX 10.11.4 and Xcode 7.3... but this problem has persisted through all versions for 2+ years now. Can you save me from the 1940s?


Bluetooth headphone music quality deteriorates when launching iOS simulator

How can I check the battery level of a connected bluetooth device? The device shows the battery level on Android so I&#39;m assuming the device supports the [GATT-based Battery Service][1]. However, by entering &quot;menu gatt&quot; in bluetoothctl and then listing the GATT attributes of the device with &quot;list-attributes [dev]&quot;, nothing shows up.

A [similar question was posted to SO][2] but the OP seems to have found a solution that doesn&#39;t work for me. When I run &quot;info [dev]&quot; in bluetoothctl I don&#39;t see the UUID for Battery Service.

I would prefer a solution that runs on the command line and is distro-agnostic.

Please let me know if this question should be posted on SuperUser instead.


  [1]: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.battery_service.xml
  [2]: https://stackoverflow.com/questions/48058357/how-to-check-battery-level-of-a-bluetooth-paired-remote &quot;How to check battery level of a bluetooth paired remote&quot;

Check battery level of connected bluetooth device on linux

Background
--
Android got a new API on Kitkat and Lollipop, to video capture the screen. You can do it either via the ADB tool or via code (starting from Lollipop).

Ever since the new API was out, many apps came to that use this feature, allowing to record the screen, and Microsoft even made its own Google-Now-On-tap competitor app.

Using ADB, you can use:

    adb shell screenrecord /sdcard/video.mp4 

You can even do it from within Android Studio itself.

The problem
--
I can&#39;t find any tutorial or explanation about how to do it using the API, meaning in code.

What I&#39;ve found
--
The only place I&#39;ve found is the documentations ([**here**][1], under &quot;Screen capturing and sharing&quot;), telling me this:

&gt; Android 5.0 lets you add screen capturing and screen sharing
&gt; capabilities to your app with the new android.media.projection APIs.
&gt; This functionality is useful, for example, if you want to enable
&gt; screen sharing in a video conferencing app.
&gt; 
&gt; The new `createVirtualDisplay()` method allows your app to capture the
&gt; contents of the main screen (the default display) into a Surface
&gt; object, which your app can then send across the network. The API only
&gt; allows capturing non-secure screen content, and not system audio. To
&gt; begin screen capturing, your app must first request the user’s
&gt; permission by launching a screen capture dialog using an Intent
&gt; obtained through the `createScreenCaptureIntent()` method.
&gt; 
&gt; For an example of how to use the new APIs, see the MediaProjectionDemo
&gt; class in the sample project.

Thing is, I can&#39;t find any &quot;MediaProjectionDemo&quot; sample. Instead, I&#39;ve found &quot;Screen Capture&quot; sample, but I don&#39;t understand how it works, as when I&#39;ve run it, all I&#39;ve seen is a blinking screen and I don&#39;t think it saves the video to a file. The sample seems very buggy.

The questions
--
How do I perform those actions using the new API:

1. start recording, optionally including audio (mic/speaker/both).
2. stop recording
3. take a screenshot instead of video.

Also, how do I customize it (resolution, requested fps, colors, time...)?

  [1]: https://developer.android.com/about/versions/android-5.0.html#UI

Content Type	Original Author	Original Content on Stackoverflow
Question	Distwo	View Question on Stackoverflow
Solution 1 - Android	Adi	View Answer on Stackoverflow

Bluetooth hands free client volume control

Android Problem Overview

Android Solutions

Solution 1 - Android

Check for special characters in string

What's the difference between `git diff --patience` and `git diff --histogram`?

Attributions