Issue17 fixed bug with NullPointer exception

Created signed release app

Author: codimoc

app/app-release.apk

@@ -1,15 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
+    compileSdkVersion 26
     buildToolsVersion '25.0.0'
-
     defaultConfig {
         applicationId "com.prismaqf.callblocker"
         minSdkVersion 16
-        targetSdkVersion 23
-        versionCode 2
-        versionName "1.2"
+        targetSdkVersion 26
+        versionCode 3
+        versionName "1.2.1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -21,10 +20,12 @@ android {
             debuggable true
         }
     }
+    productFlavors {
+    }
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile fileTree(include: ['*.jar'], dir: 'libs')
     testCompile 'junit:junit:4.12'
     testCompile 'org.mockito:mockito-core:1.10.19'
     androidTestCompile 'com.android.support.test:runner:0.5'

app/build.gradle

@@ -62,7 +62,7 @@ int getNumTriggered() {
     private int numReceived;
     private int numTriggered;
     private long myRunId;
-    private List<Filter> myFilters;
+    private List<Filter> myFilters = new ArrayList<>();
 
     /**
      * Method to return the only intance of CallHelper (singleton)

app/src/main/java/com/prismaqf/callblocker/CallHelper.java

@@ -6,7 +6,7 @@ buildscript {
     }
     dependencies {
         //classpath 'com.android.tools.build:gradle:2.3.0-beta2'
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files