Andorid marshmallow custom permission code

As we all know android has put some restrictions for permission check for security reasons from android M (6.0) Marshmallow.

Here we gonna share a simple code snippets to customize permission check and put it where you find suitable in your code.

 

Android developer training guide link:  Marshmallow permission

1) Declare permission 

 

public static final String PHONE_PERMISSION = "android.permission.READ_PHONE_STATE";

public static final String CAMERA_PERMISSION = "android.permission.CAMERA";

 

2) xml layout for custom alert dialog (custom_permission_alert.xml)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainmenu"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@null"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/background_color"
        android:clickable="true"
        android:orientation="vertical">

        <TextView
            android:id="@+id/title_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center|left"
            android:text="@string/message"
            android:padding="10dp"
            android:textColor="@color/white_color"
            android:textSize="@dimen/header_text_size" />


        <TextView
            android:id="@+id/message_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:gravity="center|left"
            android:textColor="@color/white_color"
            android:textSize="@dimen/content_text_size" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/action_no_tv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_toLeftOf="@+id/action_yes_tv"
                android:layout_centerVertical="true"
                android:layout_marginRight="10dp"
                android:text="@string/no"
                android:padding="10dp"
                android:visibility="gone"
                android:textColor="@color/white_color"
                android:textSize="@dimen/content_text_size" />

            <TextView
                android:id="@+id/action_yes_tv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:layout_marginRight="5dp"
                android:text="@string/ok"
                android:padding="10dp"
                android:textColor="@color/white_color"
                android:textSize="@dimen/content_text_size" />


        </RelativeLayout>
    </LinearLayout>

</LinearLayout>

 

3) Now create an alert dialog using above xml layout

 

/**
     * This method shows alert dialog to prompt user to enable phone permissions.
     *
     * @param title   the title
     * @param message the message
     */
    public static void showPermissionAlertDialog(final String title, String message,
                                                 final Activity context) {
        try {
            final Dialog dialog = new Dialog(context);
            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

            dialog.setContentView(R.layout.app_custom_dialog);
   
            dialog.setCancelable(false);

            dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
            // set the custom dialog components - text, image and button

            TextView titleTv = (TextView) dialog.findViewById(R.id.title_tv);
            titleTv.setText(title);

            TextView actionYesTv = (TextView) dialog.findViewById(R.id.action_yes_tv);
            actionYesTv.setText(context.getResources().getString(R.string.allow));

            TextView actionNoTv = (TextView) dialog.findViewById(R.id.action_no_tv);
            actionNoTv.setText(context.getResources().getString(R.string.deny));
            actionNoTv.setVisibility(View.VISIBLE);

            TextView messageTv = (TextView) dialog.findViewById(R.id.message_tv);
            messageTv.setText(message);

            actionYesTv.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    // Open app settings screen to allow required permissions.
                    Intent intent = new Intent();
                    intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                    Uri uri = Uri.fromParts("package", context.getPackageName(), null);
                    intent.setData(uri);
                    context.startActivity(intent);
                    dialog.dismiss();
                }
            });

            actionNoTv.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });

            if (dialog != null && !dialog.isShowing()) {
                dialog.show();
            }
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

4) Steps to call the above functions in real scenario 

 

/** 

* Check if device sdk version is greater than or equal to android M

*/

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    if (!Util.checkDevicePermissionRuntime(this, 

Util.CAMERA_PERMISSION)) {
                        Util.showPermissionAlertDialog(getResources().getString(R.string.alert),
                                getResources().getString(R.string.allow_app_to_access_device_feature), this);

       }                   

}

 

Here we done with custom permission check implementation for Marshmallow and above versions.

 

Thanks!

Network provider checksum for android (phone/tablet)

It is important to check network availability before starting search for network services like jmdns search, network check before doing any kind of network operations. 

 

1) Util class for network check

 

/**
 * This class checks network state in mobile device
 */
public class NetworkUtil {

    /**
     * The refrence.
     */
    public static NetworkUtil refrence = null;

    /**
     * Method returns class object.
     *
     * @return single instance of NetworkUtil
     */
    public static NetworkUtil getInstance() {
        if (null == refrence)
            refrence = new NetworkUtil();
        return refrence;
    }

    /**
     * Check network state.
     *
     * @param context the context
     * @return true, if successful
     */
    public static boolean checkNetworkStatus(Context context) {
        boolean hasConnectedWifi = false;
        boolean hasConnectedMobile = false;

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] netInfo = cm.getAllNetworkInfo();

        //For loop to get all data provide in mobile device
        for (NetworkInfo ni : netInfo) {
            //If wifi detected then check for connection state
            if (ni.getTypeName().equalsIgnoreCase("WIFI"))
                if (ni.isConnected()){
                    hasConnectedWifi = true;
                }


            //If mobile data detected then check for connection state
            if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
                if (ni.isConnected())
                    hasConnectedMobile = true;
        }
        return hasConnectedWifi || hasConnectedMobile;
    }
}

 

Here is the code to access NetworkUtil class where you have to pass context of activity and will return true/false to show network availability.

 

boolean isNetworkAvailable=

    NetwrokUtil.checkNetworkStatus(context);

 

Here we done with Network check in android device (phone/tablet).

 

Thanks...!!!

 

Android JMDNS Search Tutorial.

A simple example to getting start with Zero configuration service integration with your android app. Lets start with some simple steps below:

1) First of all create a simple JmdnsUtil class:

public class JmdnsUtil {

    public static final String SERVICE_TYPE="_http._tcp.local.";
    public static final String SERVICE_NAME="AppName";
    public static final int PORT=1234;

}

2) In step second create a helper class that will contain all method stuffs:

public class JmdnsHelper {

    private String[] serviceNames = null;

    /**
     * This method registers jmdns service
     */
    public void registerJmdnsService() {
        try {
            // Create a JmDNS instance
            JmDNS jmdns = JmDNS.create(InetAddress.getLocalHost());

            // Register a service
            ServiceInfo serviceInfo = ServiceInfo.create(JmdnsUtil.SERVICE_TYPE,
                    JmdnsUtil.SERVICE_NAME,
                    JmdnsUtil.PORT, "path=index.html");
            jmdns.registerService(serviceInfo);

            // Wait a bit
            Thread.sleep(100);//25000

            //Call discover services method
            discoverJmdnsService();

        } catch (IOException e) {
            System.out.println(e.getMessage());
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    /**
     * This method discovers jmdns services or
     * connected devices in local network
     */
    public String[] discoverJmdnsService() {
        JmDNS jmdns = null;
        try {
            jmdns = JmDNS.create();

            //while (true) {

            ServiceInfo[] infos = jmdns.list(JmdnsUtil.SERVICE_TYPE);
            serviceNames = new String[infos.length];
        
            for (int i = 0; i < infos.length; i++) {
                serviceNames[i] = infos[i].getName();
                // Here we can fetch all required details of device.
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (jmdns != null) try {
                jmdns.close();
            } catch (IOException exception) {
                exception.printStackTrace();
            }
        }

        if (serviceNames != null && serviceNames.length > 0) {
            return serviceNames;
        } else {
            return null;
        }
    }
}

3) Now create a service which runs in background to search for connected devices or registered services in local network.

public class JmdnsService extends Service {

    /**
     * Jmdns Constructor
     */
    public JmdnsService() {
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        startSearchTcpIpLocalServices();
        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * This method starts searching of devices in local network
     */
    private void startSearchTcpIpLocalServices() {
        if (NetworkAvailablity.checkNetworkStatus(this)) {
            try {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        //Do network search operation
                        JmdnsHelper jmdnsHelper = new JmdnsHelper();
                        final String serviceName[] = jmdnsHelper.discoverJmdnsService();

                        if (serviceName != null && serviceName.length > 0) {
                            JmdnsService.this.stopSelf();
                        } else {

                        }
                    }
                }).start();
            } catch (NullPointerException n) {
                n.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else{
            JmdnsService.this.stopSelf();
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

Here we done with simple JMDNS search integration. You can find jmdns jar at the path below.

Download JMDNS JAR

 

Thanks...!!!