Feature/check network state

README.md

@@ -3,14 +3,19 @@
 [![platform](https://img.shields.io/badge/platform-Android-green.svg)](https://www.android.com)
 [![Build Status](https://travis-ci.org/digital-voting-pass/digital-voting-pass-app.svg?branch=develop)](https://travis-ci.org/digital-voting-pass/digital-voting-pass-app)
 
+<img align="right" src="https://user-images.githubusercontent.com/2787511/27002571-8d902bb8-4de5-11e7-94d5-da48a4209fdc.gif" width="350" />
 
 Part of a [Delft Unversity of Technology](https://www.tudelft.nl) bachelor's thesis about the digitalization of the voting pass for Dutch elections using **blockchain** and **machine readable travel documents**.
 
 The scope of this project is limited to the [voting pass](https://nl.wikipedia.org/wiki/Stempas) only and forms one step towards the digitalization of the entire voting process. 
 
 This app is intended for use at the polling station. An official scans a voter's travel document to verify and redeem the suffrage, which process is stored on the blockchain and can be verifed by anyone. After the suffrage is verified, a ballot is handed out and the voting process continues in a traditional way (by pencil and paper). 
 
-[<img src="https://user-images.githubusercontent.com/2787511/27002571-8d902bb8-4de5-11e7-94d5-da48a4209fdc.gif" width="350" />]()
+
+
+<a href="https://play.google.com/store/apps/details?id=com.digitalvotingpass.digitalvotingpass">
+  <img  alt="Android app on Google Play" src="https://developer.android.com/images/brand/en_app_rgb_wo_45.png" />
+</a>
 
 ## Getting Started
 
@@ -45,4 +50,4 @@ This project is licensed under the LGPL License - see the [LICENSE.md](LICENSE.m
 We would like to give special thanks to:
 * Johan Pouwelse ([synctext](https://github.com/synctext)) for his guidance and blockchain expertise
 * Milvum ([milvum.com](https://www.milvum.com)) for the resources they provided
-* Anyone who's code was used for those great building blocks
+* Anyone who's code was used for those great building blocks

app/src/main/AndroidManifest.xml

@@ -6,8 +6,8 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.NFC" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <uses-feature android:name="android.hardware.camera" />
     <uses-feature android:name="android.hardware.camera.autofocus" />

app/src/main/java/com/digitalvotingpass/blockchain/ProgressTracker.java

@@ -1,5 +1,8 @@
 package com.digitalvotingpass.blockchain;
 
+import android.util.Log;
+
+import org.bitcoinj.core.Peer;
 import org.bitcoinj.core.listeners.DownloadProgressTracker;
 
 import java.util.ArrayList;

app/src/main/java/com/digitalvotingpass/digitalvotingpass/SplashActivity.java

@@ -8,16 +8,23 @@
 import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.HandlerThread;
+import android.provider.Settings;
 import android.support.annotation.NonNull;
+import android.support.design.widget.Snackbar;
 import android.support.v13.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
+import android.util.Log;
+import android.view.View;
 import android.widget.ProgressBar;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.digitalvotingpass.blockchain.BlockChain;
 import com.digitalvotingpass.blockchain.BlockchainCallBackListener;
 import com.digitalvotingpass.electionchoice.Election;
 import com.digitalvotingpass.electionchoice.ElectionChoiceActivity;
+import com.digitalvotingpass.utilities.Util;
 import com.digitalvotingpass.utilities.ErrorDialog;
 import com.google.gson.Gson;
 
@@ -89,10 +96,37 @@ public void onCreate(Bundle savedInstanceState) {
         }
     }
 
+    /**
+     * When the view is focused, check network state and display an error when network is unavailable.
+     * @param hasFocus
+     */
+    @Override
+    public void onWindowFocusChanged(boolean hasFocus) {
+        super.onWindowFocusChanged(hasFocus);
+        if (!Util.isOnline(getApplicationContext()) && hasFocus) {
+            initTextHandler.removeCallbacks(initTextUpdater);
+            currentTask.setText(getString(R.string.no_connection));
+
+            if (!Util.isNetEnabled(getApplicationContext())) {
+                View.OnClickListener inputSnackbarListener = new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
+                    }
+                };
+
+                Snackbar snackbar = Snackbar.make(findViewById(R.id.splash_screen_layout), getString(R.string.please_enable_connect_message), Snackbar.LENGTH_INDEFINITE);
+                snackbar.getView().setBackgroundColor(ContextCompat.getColor(this, R.color.redFailed));
+                snackbar.setAction(R.string.go_network_settings, inputSnackbarListener);
+                snackbar.show();
+            }
+        }
+    }
+
     @Override
     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                            @NonNull int[] grantResults) {
-       if (requestCode == REQUEST_CODE_STORAGE) {
+        if (requestCode == REQUEST_CODE_STORAGE) {
             if (grantResults.length != 1 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
             } else {
                 handler.post(startBlockChain);
@@ -136,7 +170,7 @@ public void onDownloadComplete() {
         Intent intent;
 
         // Check if the election exists in sharedpreferences and in the blockchain
-        if(json.equals("not found")){
+        if(json.equals("not found")) {
             intent = new Intent(SplashActivity.this, ElectionChoiceActivity.class);
         } else {
             Gson gson = new Gson();

app/src/main/java/com/digitalvotingpass/utilities/Util.java

@@ -4,6 +4,8 @@
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Color;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
 
@@ -26,6 +28,7 @@ public class Util {
 
     /**
      * Returns the height of the status bar in pixels
+     *
      * @param resources Resources object required to get the height attribute.
      * @return int
      */
@@ -42,7 +45,8 @@ public static int getStatusBarHeight(Resources resources) {
      * Sets up a top-padding for the given app bar equal to the height of the status bar.
      * This increases the length of the app bar so it fits nicely below the status bar.
      * This method also sets the status bar transparency.
-     * @param appBar Toolbar to set padding to
+     *
+     * @param appBar   Toolbar to set padding to
      * @param activity Activity - current activity
      */
     public static void setupAppBar(Toolbar appBar, Activity activity) {
@@ -58,8 +62,9 @@ public static void setupAppBar(Toolbar appBar, Activity activity) {
      * Copies an InputStream into a File.
      * This is used to copy an InputStream from the assets folder to a file in the FileSystem.
      * Creates nay non-existant parent folders to f.
+     *
      * @param is InputStream to be copied.
-     * @param f File to copy data to.
+     * @param f  File to copy data to.
      */
     public static void copyAssetsFile(InputStream is, File f) throws IOException {
         if (!f.exists()) {
@@ -72,8 +77,7 @@ public static void copyAssetsFile(InputStream is, File f) throws IOException {
         final int buffer_size = 1024 * 1024;
         try {
             byte[] bytes = new byte[buffer_size];
-            for (;;)
-            {
+            for (; ; ) {
                 int count = is.read(bytes, 0, buffer_size);
                 if (count == -1)
                     break;
@@ -91,7 +95,7 @@ public static void copyAssetsFile(InputStream is, File f) throws IOException {
      * This method is used for signing transaction hashes (which are in hex).
      */
     public static byte[] hexStringToByteArray(String hStr) {
-        if(hStr != null) {
+        if (hStr != null) {
             int len = hStr.length();
             byte[] data = new byte[len / 2];
             for (int i = 0; i < len; i += 2) {
@@ -131,4 +135,18 @@ public static Map<String, String> getKeyValueFromStringArray(Context ctx) {
         }
         return result;
     }
+
+    public static boolean isOnline(Context ctx) {
+        ConnectivityManager cm =
+                (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo netInfo = cm.getActiveNetworkInfo();
+        return netInfo != null && netInfo.isConnectedOrConnecting();
+    }
+
+    public static boolean isNetEnabled(Context ctx) {
+        ConnectivityManager cm =
+                (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo netInfo = cm.getActiveNetworkInfo();
+        return netInfo != null;
+    }
 }

app/src/main/res/layout/activity_splash_screen.xml

@@ -1,52 +1,58 @@
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/splash_screen_layout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:gravity="center"
     android:background="@color/govDarkBlue">
 
-    <TextView
-        android:id="@+id/text_splash_screen"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
+    <LinearLayout
+        android:orientation="vertical"
         android:gravity="center"
-        android:text="@string/app_name"
-        android:textColor="@color/govLightGray"
-        android:paddingBottom="10dp"
-        android:textSize="20sp"
-        />
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
 
-    <ImageView
-        android:id="@+id/splash_screen"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:src="@drawable/voting_pass_icon"
-        android:contentDescription="@string/app_name"
-        android:gravity="center"
-        />
+        <TextView
+            android:id="@+id/text_splash_screen"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:text="@string/app_name"
+            android:textColor="@color/govLightGray"
+            android:paddingBottom="10dp"
+            android:textSize="20sp"
+            />
 
-    <TextView
-        android:id="@+id/progress_current_task"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:gravity="center"
-        android:textColor="@color/govLightGray"
-        android:textSize="20sp"
-        android:text="@string/initializing_text" />
+        <ImageView
+            android:id="@+id/splash_screen"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/app_name"
+            android:gravity="center"
+            android:src="@drawable/voting_pass_icon" />
 
-    <ProgressBar
-        android:id="@+id/download_progress_bar"
-        style="?android:attr/progressBarStyleHorizontal"
-        android:minHeight="30dp"
-        android:layout_width="match_parent"
-        android:gravity="center"
-        android:layout_height="wrap_content" />
+        <TextView
+            android:id="@+id/progress_current_task"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:textColor="@color/govLightGray"
+            android:textSize="20sp"
+            android:text="@string/initializing_text" />
 
-    <TextView
-        android:id="@+id/download_progress_text"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:gravity="center"
-        android:textColor="@color/govLightGray"
-        android:textSize="20sp" />
-</LinearLayout>
+        <ProgressBar
+            android:id="@+id/download_progress_bar"
+            style="?android:attr/progressBarStyleHorizontal"
+            android:minHeight="30dp"
+            android:layout_width="match_parent"
+            android:gravity="center"
+            android:layout_height="wrap_content" />
+
+        <TextView
+            android:id="@+id/download_progress_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:textColor="@color/govLightGray"
+            android:textSize="20sp" />
+    </LinearLayout>
+</android.support.design.widget.CoordinatorLayout>

app/src/main/res/values-nl/strings.xml

@@ -107,6 +107,9 @@
     <!--Splash Activity-->
     <string name="downloading_text">Downloaden...</string>
     <string name="initializing_text">Initialiseren...</string>
+    <string name="please_enable_connect_message">Activeer de internet verbinding</string>
+    <string name="no_connection">Geen Internet</string>
+    <string name="go_network_settings">WIFI Instellingen</string>
     <string-array name="init_array">
         <item>Initialiseren</item>
         <item>\u00A0Initialiseren.</item>

app/src/main/res/values/strings.xml

@@ -107,6 +107,9 @@
     <!--Splash Activity-->
     <string name="downloading_text">Downloading...</string>
     <string name="initializing_text">Initializing...</string>
+    <string name="please_enable_connect_message">Please enable network connection</string>
+    <string name="no_connection">No Network</string>
+    <string name="go_network_settings">WIFI Settings</string>
     <string-array name="init_array">
         <item>Initializing</item>
         <item>\u00A0Initializing.</item>
@@ -119,7 +122,6 @@
     <string name="transaction_received_item_format_detail">From %s</string>
     <string name="transaction_sent_item_format_title">Sent %1$d vote \n%2$s %3$s</string>
     <string name="transaction_sent_item_format_detail">To %s</string>
-
     <string-array name="address_array">
         <item>1GoqgbPZUV2yuPZXohtAvB2NZbjcew8Rk93mMn|Government</item>
     </string-array>