WIFI add network will be you can take hints from this code..

how do we get the access point name from an Android Phone.

    WifiManager mWiFiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    WifiInfo w = mWiFiManager.getConnectionInfo();
    Toast.makeText(this, &quot;APN Name = &quot;+w.getSSID(), Toast.LENGTH_SHORT).show();

The above code snippet is for current active APN name.



I am using PIL to resize the images there by converting larger images to smaller ones. Are there any standard ways to reduce the file size of the image without losing the quality too much, lets say the original size of the image is 100KB, i want to get it down to like 5 or 10 KB especially for png and jpeg formats.

How to reduce the image file size using PIL

I am developing an application that when the button is pressed, it opens a dialog with OK and Cancel buttons.

It works fine.

When the user presses the back button, I am handling this as follows

    public boolean onKeyDown(int keyCode, KeyEvent event) 
    {
        if ((keyCode == KeyEvent.KEYCODE_BACK)) 
    	{
    	
    	}
     return super.onKeyDown(keyCode, event);
    }

But the above method is not called. How can I handle this?

How to handle Back button with in the dialog?

I&#39;d like to add new bearer(s) to Android (rooted/custom build), to be a peer with Wifi and GPRS.

I have done some Android development and I am aware that (in Android 2.2)  there are constants for WIFI and GPRS.  Does this mean that I will need to be adding constants in all over the place, as well as providing the network stack?

The first bearer I want to add is USBNet (for Androids with USB host).

Another will be a 3G USB dongle as a second GPRS bearer.

I have started by downloading the source.

Adding a new network bearer to Android

I'd like to add new bearer(s) to Android (rooted/custom build), to be a peer with Wifi and GPRS.
I have done some Android development and I am aware that (in Android 2.2) there are constants for WIFI and GPRS. Does this mean that I will need to be adding constants in all over the place, as well as providing the network stack?
The first bearer I want to add is USBNet (for Androids with USB host).
Another will be a 3G USB dongle as a second GPRS bearer.
I have started by downloading the source.

I want to use select query for retrieving data from table. I have found, `rawQuery(query, selectionArgs)` method of `SQLiteDatabase` class to retrieve data. But I don&#39;t know how the `query` and `selectionArgs` should be passed to `rawQuery` method?

rawQuery(query, selectionArgs)

I am using the query method of SQLiteDatabase. How do I use the query method? 

I tried this:

    Cursor cursor = sqLiteDatabase.query(
        tableName, tableColumns, whereClause, whereArgs, groupBy, having, orderBy);

**tableColumns** - columns parameter is constructed as follows. 
  
    String[] columns = new String[]{KEY_ID, KEY_CONTENT};

If we need to get all the fields, how should the column parameter to be constructed. Do we need to include all the Field Names in String array?

How do I properly use the query method?

SQLiteDatabase.query method

Is it possible to draw unfilled figures on Android? By default circles and rectangles are filled.

How to draw unfilled figures on Android?

I am aware that using `Context` and a method `getClass().getName()` I can get a string which represent full class name, like `com.package1.package2.MainActivity`. 

How can I get only the last part, class name only? In this case it would be `MainActivity` string. 

I can do it with a simple `split()` method, but maybe there is a better way, more reliable. 

How to get class name only, not full path?

I have a custom global class which looks like this

    import android.app.Application;
    
    public class MyApp extends Application {
    
        public String MainAct;
    
        public String getMainAct() {
            return MainAct;
        }
    
        public void setMainAct(String mainAct) {
            MainAct = mainAct;
        }
    }

I want to preserve a string in this class via another `Activity` in its `onCreate` method. 

        String local = &quot;myLocalVariable&quot;;
        ((MyApp) getApplication()).setMainAct(local); //breaks here!!!
        String name = ((MyApp) getApplication()).getMainAct();

It breaks on the marked line with error: `Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to com.xxx.yyy.global.MyApp`

I&#39;ve checked the code for five times and I cannot find error anywhere. Can anyone tell me where the error is?!

Thanks

Custom global Application class breaks with &quot;android.app.Application cannot be cast to&quot;

I would like to calculate the exact location of a mobile device inside a building ( so no GPS access)

I want to do this using the signal strength(in dBm) of at least 3 fixed wifi signals(3 fixed routers of which I know the position)

Google already does that and I would like to know how they figure out the exact location based on the this data

Check this article for more details : [http://www.codeproject.com/Articles/63747/Exploring-GoogleGears-Wi-Fi-Geo-Locator-Secrets][1]


  [1]: http://www.codeproject.com/Articles/63747/Exploring-GoogleGears-Wi-Fi-Geo-Locator-Secrets

How to calculate distance from Wifi router using Signal Strength?

How do I allow any device, e.g., iPhone, to connect over a WLAN to my Mac&#39;s localhost server?

On my Mac, I&#39;m running a &quot;Hello World&quot; HTTP [Node.js][1] server that serves a page, which Safari opens successfully, at `http://localhost:1337`. And, running `ipconfig getifaddr en1` in Terminal outputs `192.168.1.9`.

But, Safari, on both iPhone &amp; Mac, displays &quot;Safari can&#39;t connect to the server&quot; when it tries to open `http://192.168.1.9:1337`.

I don&#39;t think this should involve [port forwarding][2] because I only want the HTTP server to be available privately, not publicly.

Related:

* https://stackoverflow.com/questions/5666018/accessing-localhost-from-iphone-in-same-network
* https://superuser.com/questions/308451/connect-to-localhost-from-another-computer
* https://superuser.com/questions/400752/can-we-run-local-server-over-local-network-without-internet-access
* https://serverfault.com/questions/254947/accessing-localhost-xampp-from-another-computer-over-lan-network-how-to

  [1]: http://nodejs.org
  [2]: http://en.wikipedia.org/wiki/Port_forwarding

Connect Device to Mac localhost Server?

I&#39;m trying to get the SSID of the WIFI network when my android device is connected to WIFI.

I&#39;ve registered a BroadcastReceiver listening for `android.net.wifi.supplicant.CONNECTION_CHANGE` . I get the notification when WIFI is disconnected or reconnected. Unfortunately, I can&#39;t get the network&#39;s SSID.

I&#39;m using the following code to find the SSID:

    WifiManager wifiManager = (WifiManager) context.getSystemService(context.WIFI_SERVICE);
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    String ssid = wifiInfo.getSSID();

Instead of the SSID, I get the string &lt;a href=&quot;http://code.google.com/p/android/issues/detail?id=43336&quot;&gt;`&lt;unknown ssid&gt;`&lt;/a&gt; back.

These are the permissions in the manifest (I&#39;ve added ACCESS_NETWORK_STATE just to check, I don&#39;t actually need it)

    &lt;uses-permission android:name=&quot;android.permission.INTERNET&quot;/&gt;
    &lt;uses-permission android:name=&quot;android.permission.ACCESS_WIFI_STATE&quot;/&gt;
    &lt;uses-permission android:name=&quot;android.permission.ACCESS_NETWORK_STATE&quot;/&gt;
    &lt;uses-permission android:name=&quot;android.permission.ACCESS_FINE_LOCATION&quot;/&gt;


Why does this happen? How can I get the actual SSID? Is the broadcast fired to early, before the connection is established? Is there another broadcast I should listen to? I&#39;m only interested in WIFI connections, not 3G connections.

Update: I just checked, `wifiInfo.getBSSID()` returns null.

Get SSID when WIFI is connected

We have iPad and iPhone devices, but short of wires. Is there any way that we can install/debug the builds over Wi-Fi in iOS? 

I know the way in Android, but not of iOS.

iOS – Run/Debug/Install builds over Wi-Fi

I am trying to replicate an existing Android Application that I made to iOS. In my application, I should be able to connect to a WiFi network given the SSID and the Password. The SSID and the Password can be hardcoded or can be inputted by the user. I was going through the internet to research how this can be done on iOS, however, it seems that this behavior is highly discouraged and that there&#39;s no way on doing this using public/documented libraries that won&#39;t get your application rejected by the App Store.

The thing is I&#39;ll be using this application personally and I don&#39;t plan on submitting it to the App Store so it&#39;s okay if I use external libraries. If my friends would want to use it, I could export an enterprise ipa and give them instructions on how to install it.

Upon searching, it seemed that [MobileWifi.framework][1] was a good candidate. However, it does not seem that there&#39;s a straightforward way of using this library to connect to a WiFi network given the SSID and the Password.

Is there anyone who has successfully tried to connect to a Wifi Network given the SSID and Password?

  [1]: http://iphonedevwiki.net/index.php/MobileWiFi.framework

How to programmatically connect to a WiFi network given the SSID and password

I cannot connect to my local SQL Server Express (2012, but the version shouldn&#39;t matter) from my server (Windows 2008 R2) to use a tool on it (APEX SQL Data Diff if you are wondering). I can browse the network servers fine, and select my local instance from the dropdown of available servers, but when I go to search tables on the server, it times out with this error message (same is true of SSMS).

&gt; *A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or
&gt; was not accessible. Verify that the instance name is correct and that
&gt; SQL Server is configured to allow remote connections. (provider: SQL
&gt; Network Interfaces, error: 28 - Server doesn&#39;t support strong text
&gt; requested protocol) (Microsoft SQL Server, Error: -1)*

I have enabled the firewall - that&#39;s not it.

I have allowed remote connections - that&#39;s not it.

SQL Server Browser service is on and passed through the firewall - that&#39;s not it.

I can connect fine with the same tools ***TO*** the server, but ***FROM*** the server it fails.

Any ideas?

SQL Server Express cannot connect error: 28 - Server doesn&#39;t support requested protocol

As written in the heading, my question is, why does **TCP/IP** use big endian encoding when transmitting data and not the alternative little-endian scheme?

Why is network-byte-order defined to be big-endian?

The throughput of a channel is a measure of amount of data actually moves through the channel. Why is it substantially less than the bandwidth of the channel?

Throughput and bandwidth difference?

I started to explore the option of connecting with other using a p2p connection, so I coded a simple socket program in JAVA for android devices in which the users can share simple messages p2p (I didn&#39;t have any idea about NAT then). I got to know about NAT, so I now need to establish a TCP connection with another user which uses a server for discovery but payload is transferred p2p. I have also looked at XMPP(a very good and detailed explanation of how protocol works is [here][1]) and UPnP but I dont know how to implement them.

Another interesting question that arises is of BitTorrent because they can work on any device and even behind a NAT. I am not able to get any explanation of how BitTorrent works.

I have researched a lot but I am stuck.

My questions are:

1. A detailed explanation of BitTorrent(like [here][1], not how torrents work) and how is it able to work around NAT ?
2. Is there a way to make a NAT entry programmatically ?
3. Is socket programming sufficient for p2p ?
3. How difficult is it to create your own protocol and how can I build one ?
4. If two devices D1 and D2 want to communicate p2p and they know each other&#39;s IP. D1 sends a request to D2 and that can&#39;t get through the D2&#39;s NAT, but there should be an entry created in D1&#39;s NAT. So when D2 tries to send something D1&#39;s NAT should discover an entry with D2&#39;s IP. Then why is the packet not allowed by it ?


  [1]: http://ceit.uq.edu.au/content/how-xmpp-works-step-step

Connecting P2P over NAT?

For the [`Activity` source code][1], line 3898 (close to the bottom):

    /**
     * @hide
     */
    public final boolean isResumed() {
        return mResumed;
    }

What does `@hide` mean?

I found my `public class ChildActivity extends Activity { ... }` cannot use/see `Activity.isResumed()`. Is this normal? How can I access it?


  [1]: https://android.googlesource.com/platform/frameworks/base/+/android-2.3.5_r1/core/java/android/app/Activity.java

What does @hide mean in the Android source code?

we have android + linux m/c, we log in into linux shell and boot the machine in android GUI.
now we have the some script that is running on the same machine through linux shell. In that case when the script hangs we need to restart android machine. but it result into restarting the linux machine too. as they are on same machine. so i need the way to restart the android so it comes out of hang state and control remains on the script that is running through the linux shell.

so is there any adb or linux command that work for me?

Restart android machine

So in 4.3 there was a concept of System applications. APKs that were placed in `/system/app` were given system privileges. As of 4.4, there is a new concept of &quot;privileged app&quot;. Privileged apps are stored in `/system/priv-app` directory and seem to be treated differently. If you look in the AOSP Source code, under `PackageManagerService`, you will see new methods such as

    static boolean locationIsPrivileged(File path) {
        try {
            final String privilegedAppDir = new File(Environment.getRootDirectory(), &quot;priv-app&quot;)
                    .getCanonicalPath();
            return path.getCanonicalPath().startsWith(privilegedAppDir);
        } catch (IOException e) {
            Slog.e(TAG, &quot;Unable to access code path &quot; + path);
        }
        return false;
    }


So here is an example of a situation where these differ. 

    public final void addActivity(PackageParser.Activity a, String type) {
    ...
    if (!systemApp &amp;&amp; intent.getPriority() &gt; 0 &amp;&amp; &quot;activity&quot;.equals(type)) {
                    intent.setPriority(0);
                    Log.w(TAG, &quot;Package &quot; + a.info.applicationInfo.packageName + &quot; has activity &quot;
                            + a.className + &quot; with priority &gt; 0, forcing to 0&quot;);
                }
    ...

This affects the priority of any activities that are not defined as system applications. This seems to imply you can not add an activity to the package manager whose priority is higher than 0, unless you are a system app. This does **not** preclude privileged apps as far as I can tell (there is a lot of logic here, I may be wrong.). 

My question is what exactly does this imply? If my app is privileged, but not system, what difference will that make? In `PackageManagerService` you can find various things that differ between system and privileged apps, they are not exactly the same. There should be some kind of ideology behind privileged apps, otherwise they would have just said:

    if locationIsPrivileged: app.flags |= FLAG_SYSTEM

and been done with it. This is a new concept, and I think it would be important to know the difference between these kinds of apps for anyone who is doing AOSP development as of 4.4.

What is the difference between system apps and privileged apps on Android?

I would like to modify Android OS (official image from AOSP) to add preprocessing to a normal phone call playback sound.

I&#39;ve already achieved this filtering for app audio playback (by modifying *HAL* and *audioflinger*).

I&#39;m OK with targeting only a specific device (Nexus 5X). Also, I only need to filter playback - I don&#39;t care about recording (uplink).

*UPDATE #1:* 

To make it clear - I&#39;m OK with modifying Qualcomm-specific drivers, or whatever part that it is that runs on Nexus 5X and can help me modify in-call playback.


*UPDATE #2:* 

I&#39;m attempting to create a Java layer app that routes the phone playback to the music stream in real time.

I&#39;ve already succeeded in installing it as a system app, getting permissions for initializing `AudioRecord` with `AudioSource.VOICE_DOWNLINK`. However, the recording gives blank samples; it doesn&#39;t record the voice call.

This is the code inside my worker thread:

    // Start recording
    int recBufferSize = AudioRecord.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT);
    mRecord = new AudioRecord(MediaRecorder.AudioSource.VOICE_DOWNLINK, 44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, recBufferSize);

    // Start playback
    int playBufferSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT);
    mTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT, playBufferSize, AudioTrack.MODE_STREAM);

    mRecord.startRecording();;
    mTrack.play();

    int bufSize = 1024;
    short[] buffer = new short[bufSize];
    int res;
    while (!interrupted())
    {
        // Pull recording buffers and play back
        res = mRecord.read(buffer, 0, bufSize, AudioRecord.READ_NON_BLOCKING);
        mTrack.write(buffer, 0, res, AudioTrack.WRITE_BLOCKING);
    }

    // Stop recording
    mRecord.stop();
    mRecord.release();
    mRecord = null;

    // Stop playback
    mTrack.stop();
    mTrack.release();;
    mTrack = null;


I&#39;m running on a Nexus 5X, my own AOSP custom ROM, Android 7.1.1. I need to find the place which will allow call recording to work - probably somewhere in `hardware/qcom/audio/hal` in platform code.

Also I&#39;ve been looking at the function `voice_check_and_set_incall_rec_usecase` at `hardware/qcom/audio/hal/voice.c` However, I wasn&#39;t able to make sense of it (how to make it work the way I want it to).

*UPDATE #3:*

  I&#39;ve opened [a more-specific question](https://stackoverflow.com/questions/43818736/call-recording-make-audiosource-voice-downlink-work-on-nexus-5x-rooting-or-cu) about using `AudioSource.VOICE_DOWNLINK`, which might draw the right attention and will eventually help me solve this question&#39;s problem as well.


Modifying in-call voice playback in Android custom ROM

I am getting following error log if I connect my android phone with Android Oreo OS to Linux PC

    $ adb devices
    List of devices attached
    xxxxxxxx	no permissions (user in plugdev group; are your udev rules wrong?);
    see [http://developer.android.com/tools/device.html]

I tried with the link provided by  the error message but still getting same error.

Content Type	Original Author	Original Content on Stackoverflow
Question	fadedbee	View Question on Stackoverflow
Solution 1 - Android	Varun kumar	View Answer on Stackoverflow

Adding a new network bearer to Android

Android Problem Overview

Android Solutions

Solution 1 - Android

How to handle Back button with in the dialog?

How to reduce the image file size using PIL

Attributions