All mandatory requests are done. Just optional feature need more time…

… to make it's look and feel better

.gitignore

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+# Created by .gitignore support plugin (hsz.mobi)
+
+### Android template
+# Built application files
+*.apk
+*.ap_
+
+# Files for the Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Eclipse project files
+.classpath
+.project
+
+# Intellij project files
+*.iml
+*.ipr
+*.iws
+.idea/
+out/

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 20
+    buildToolsVersion "20.0.0"
+
+    packagingOptions {
+        exclude 'META-INF/LICENSE.txt'
+    }
+
+    defaultConfig {
+        applicationId "ntpclock.kamalan.com.app"
+        minSdkVersion 15
+        targetSdkVersion 20
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            runProguard false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile 'com.squareup.retrofit:retrofit:1.6.1'
+    compile 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
+    compile 'com.squareup.okhttp:okhttp:2.0.0'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in F:\Android SDK\sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

app/src/androidTest/java/ntpclock/kamalan/com/app/ApplicationTest.java

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+package ntpclock.kamalan.com.app;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="ntpclock.kamalan.com.app" >
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/ntpclock/kamalan/com/app/MainActivity.java

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+package ntpclock.kamalan.com.app;
+
+import android.app.Activity;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.Handler;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.RelativeLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.apache.commons.net.ntp.NTPUDPClient;
+import org.apache.commons.net.ntp.TimeInfo;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import ntpclock.kamalan.com.utility.InternetConnection;
+import ntpclock.kamalan.com.utility.NTPClient;
+import ntpclock.kamalan.com.widget.MyAnalogClock;
+
+public class MainActivity extends Activity {
+
+    private static final String TAG = "MainActivity";
+    private static final String SERVER_ADDR = "0.asia.pool.ntp.org";
+    private static final long UPDATE_INTERVALS = 10 * 60 * 1000;
+
+    private Handler mHandler = new Handler();
+    private Runnable mRunnable = new Runnable() {
+        @Override
+        public void run() {
+            displayCurrentTime();
+            displayRemainingTime();
+            displayAnalogClock();
+            mHandler.postDelayed(mRunnable, 1000);
+        }
+    };
+
+    private Date currentTime;
+    private Date nextUpdateTime;
+
+    private TextView mTimeDisplay;
+    private TextView mTimeRemaining;
+    private RelativeLayout mRelativeLayout;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        mTimeDisplay = (TextView) findViewById(R.id.tvTimeDisplay);
+        mTimeRemaining = (TextView) findViewById(R.id.tvRemainingTime);
+        mRelativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
+
+        getTimeFromNTPServer();
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+
+        checkInternetStatus();
+    }
+
+    protected void onStop() {
+        super.onStop();
+
+        mHandler.removeCallbacks(mRunnable);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+        if (id == R.id.action_sync) {
+            getTimeFromNTPServer();
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+    private void getTimeFromNTPServer() {
+        if(InternetConnection.isAvailable(MainActivity.this))
+            new getNTPTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null);
+    }
+
+    private void checkInternetStatus() {
+        if(!InternetConnection.isAvailable(MainActivity.this))
+            Toast.makeText(MainActivity.this, "Internet connection not found!", Toast.LENGTH_LONG).show();
+    }
+
+    private void displayCurrentTime() {
+        if (currentTime.getTime() >= nextUpdateTime.getTime()) {
+            getTimeFromNTPServer();
+            return;
+        }
+
+        long newTime = currentTime.getTime();
+        newTime += 1000; // reduce one seconds
+        currentTime = new Date(newTime);
+        String newDate = new SimpleDateFormat("EEE dd MMM yyyy hh:mm:ss").format(currentTime);
+        mTimeDisplay.setText("Current network time:\n" + newDate);
+    }
+
+    private void displayRemainingTime() {
+        long remainingTime = nextUpdateTime.getTime() - currentTime.getTime();
+        Date time = new Date(remainingTime);
+        String newDate = new SimpleDateFormat("mm:ss").format(time);
+        mTimeRemaining.setText("To next update:\n" + newDate);
+    }
+
+    private void displayAnalogClock() {
+        mRelativeLayout.removeAllViews();
+        mRelativeLayout.addView(new MyAnalogClock(MainActivity.this,
+                mRelativeLayout.getMeasuredWidth()/2,
+                mRelativeLayout.getMeasuredHeight()/2,
+                currentTime));
+    }
+
+    /************************
+     *   Async Task Class   *
+     ************************/
+    private class getNTPTask extends AsyncTask<Void, Void, Date> {
+
+        @Override
+        protected void onPreExecute() {
+            Log.d(TAG, "getNTPTask is about to start...");
+            mHandler.removeCallbacks(mRunnable);
+        }
+
+        @Override
+        protected Date doInBackground(Void... params) {
+            Date date = null;
+
+            NTPUDPClient client = new NTPUDPClient();
+            // We want to timeout if a response takes longer than 10 seconds
+            client.setDefaultTimeout(15000);
+            try {
+                client.open();
+                try {
+                    InetAddress hostAddr = InetAddress.getByName(SERVER_ADDR);
+                    System.out.println("> " + hostAddr.getHostName() + "/" + hostAddr.getHostAddress());
+                    TimeInfo info = client.getTime(hostAddr);
+                    date = NTPClient.processResponse(info);
+                } catch (IOException ioe) {
+                    ioe.printStackTrace();
+                }
+            } catch (SocketException e) {
+                e.printStackTrace();
+            } finally {
+                client.close();
+            }
+
+            return date;
+        }
+
+        @Override
+        protected void onPostExecute(Date date) {
+            Log.d(TAG, "getNTPTask finished its task.");
+
+            if(date != null) {
+                currentTime = date;
+                long time = date.getTime();
+                time += UPDATE_INTERVALS;
+                nextUpdateTime = new Date(time);
+                mHandler.post(mRunnable);
+            } else
+                Toast.makeText(MainActivity.this, "Error! Couldn't get the time", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+}

app/src/main/java/ntpclock/kamalan/com/utility/InternetConnection.java

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+package ntpclock.kamalan.com.utility;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.util.Log;
+
+/**
+ * Created by Hesam on 16/07/14
+ */
+public class InternetConnection {
+    private static String TAG = "InternetConnection";
+
+    private static int internetStatus = -1;
+    private static String internetType = null;
+
+
+    public static boolean isAvailable(Context context) {
+        boolean found = false;
+
+        try {
+            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+            NetworkInfo netInfo = cm.getActiveNetworkInfo();
+            if (netInfo != null && netInfo.isConnected()) {
+                found = true;
+                internetStatus = 0;
+            }
+
+            NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
+            NetworkInfo _3g  = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
+
+            if (wifi.isConnected())
+                internetType = "WIFI";
+
+            if (_3g.isConnected())
+                internetType = "3G";
+
+        } catch (Exception e) {
+            Log.e("CheckConnectivity Exception", e.getMessage(), e);
+        }
+
+        if(!found)
+            Log.e(TAG, "Internet Connection not found.");
+
+        return found;
+    }
+
+    public static int getInternetStatus() {
+        return internetStatus;
+    }
+
+    public static String getInternetType() {
+        return internetType;
+    }
+}