minor updates on UI layout and colors

Author: johnnzhou

app/src/main/java/com/lcl/lclmeasurementtool/MainActivity.java

@@ -44,7 +44,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
 
 
-        NetworkManager mNetworkManager = new NetworkManager(this);
+        mNetworkManager = new NetworkManager(this);
         mCellularManager = CellularManager.getManager(this);
 
         if (!mNetworkManager.isCellularConnected()) {

app/src/main/java/com/lcl/lclmeasurementtool/Managers/NetworkManager.java

@@ -135,14 +135,23 @@ public void removeAllNetworkChangeListeners() {
      * @return true if the current device is connected to the internet via cellular; false otherwise.
      */
     public boolean isCellularConnected() {
-        return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR);
+        return capabilities != null &&
+                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR);
     }
 
     public int getLinkDownstreamBandwidthKbps() {
-        return this.capabilities.getLinkDownstreamBandwidthKbps();
+        if (capabilities != null) {
+            return capabilities.getLinkDownstreamBandwidthKbps();
+        }
+
+        return 0;
     }
 
     public int getLinkUpstreamBandwidthKbps() {
-        return this.capabilities.getLinkUpstreamBandwidthKbps();
+        if (capabilities != null) {
+            return this.capabilities.getLinkUpstreamBandwidthKbps();
+        }
+
+        return 0;
     }
 }

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

@@ -74,7 +74,7 @@
                 android:text="Signal Strength"
                 android:textAlignment="center"
                 android:textColor="@color/white"
-                android:textSize="16sp"
+                android:textSize="14sp"
                 android:typeface="monospace"
                 app:layout_constraintBottom_toBottomOf="parent"
                 app:layout_constraintStart_toEndOf="@+id/imageView"
@@ -84,7 +84,7 @@
                 android:id="@+id/SignalStrengthValue"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_marginStart="36dp"
+                android:layout_marginStart="24dp"
                 android:fontFamily="monospace"
                 android:textColor="@color/white"
                 android:textSize="16sp"
@@ -125,7 +125,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="2dp"
-                android:layout_marginEnd="12dp"
+                android:layout_marginEnd="8dp"
                 app:layout_constraintBottom_toBottomOf="parent"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toEndOf="@id/SignalStrengthStatus"

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

@@ -11,7 +11,8 @@
         <item name="colorSecondaryVariant">@color/teal_700</item>
         <item name="colorOnSecondary">@color/black</item>
         <!-- Status bar color. -->
-        <item name="android:statusBarColor" tools:targetApi="l">?attr/statusBarBackground</item>
+        <item name="android:statusBarColor" tools:targetApi="22">?attr/statusBarBackground</item>
+        <item name="android:navigationBarColor" tools:targetApi="22">@color/dark_black</item>
         <!-- Customize your theme here. -->
     </style>