Add sign config

app/build.gradle

@@ -14,8 +14,34 @@ android {
         versionName "2.2.0"
     }
 
+    Properties localProperties = new Properties()
+    if (project.rootProject.file('local.properties').exists()) {
+        localProperties.load(project.rootProject.file('local.properties').newDataInputStream())
+    }
+
+    signingConfigs {
+        if (localProperties.getProperty("storeFile") != null) {
+            config {
+                storeFile file(localProperties.getProperty("storeFile"))
+                storePassword localProperties.getProperty("storePassword")
+                keyAlias localProperties.getProperty("keyAlias")
+                keyPassword localProperties.getProperty("keyPassword")
+            }
+        }
+    }
+
     buildTypes {
+        debug {
+            if (localProperties.getProperty("storeFile") != null) {
+                signingConfig signingConfigs.config
+            }
+        }
         release {
+            if (localProperties.getProperty("storeFile") != null) {
+                signingConfig signingConfigs.config
+            } else {
+                signingConfig signingConfigs.debug
+            }
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }