diff --git a/enabling_splash_screen/android/app/build.gradle b/enabling_splash_screen/android/app/build.gradle
index 66353f4..f065427 100644
--- a/enabling_splash_screen/android/app/build.gradle
+++ b/enabling_splash_screen/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/handling_routes/android/app/build.gradle b/handling_routes/android/app/build.gradle
index 0325c78..d6d6a5d 100644
--- a/handling_routes/android/app/build.gradle
+++ b/handling_routes/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/load_local_image/android/app/build.gradle b/load_local_image/android/app/build.gradle
index 3698ac8..b0ca1e6 100644
--- a/load_local_image/android/app/build.gradle
+++ b/load_local_image/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/load_local_json/android/app/build.gradle b/load_local_json/android/app/build.gradle
index d7f109e..cb0d900 100644
--- a/load_local_json/android/app/build.gradle
+++ b/load_local_json/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/navigation_drawer/android/app/build.gradle b/navigation_drawer/android/app/build.gradle
index ed8c060..71b004e 100644
--- a/navigation_drawer/android/app/build.gradle
+++ b/navigation_drawer/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/simple_material_app/android/app/build.gradle b/simple_material_app/android/app/build.gradle
index 2427dde..451b407 100644
--- a/simple_material_app/android/app/build.gradle
+++ b/simple_material_app/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/stateful_widget/android/app/build.gradle b/stateful_widget/android/app/build.gradle
index 6b88e63..184b4e7 100644
--- a/stateful_widget/android/app/build.gradle
+++ b/stateful_widget/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/stateless_widgets/android/app/build.gradle b/stateless_widgets/android/app/build.gradle
index 7503e80..a3d0406 100644
--- a/stateless_widgets/android/app/build.gradle
+++ b/stateless_widgets/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/tip_calculator/android/app/build.gradle b/tip_calculator/android/app/build.gradle
index 1902e0d..fa6061d 100644
--- a/tip_calculator/android/app/build.gradle
+++ b/tip_calculator/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_alert_dialog/android/app/build.gradle b/using_alert_dialog/android/app/build.gradle
index 3ec56e2..f5f0cc5 100644
--- a/using_alert_dialog/android/app/build.gradle
+++ b/using_alert_dialog/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
@@ -47,6 +47,6 @@ flutter {
 
 dependencies {
     androidTestCompile 'com.android.support:support-annotations:28.0.0'
-    androidTestCompile 'com.android.support.test:runner:0.5'
-    androidTestCompile 'com.android.support.test:rules:0.5'
+    androidTestCompile 'com.android.support.test:runner:1.0.2'
+    androidTestCompile 'com.android.support.test:rules:1.0.2'
 }
diff --git a/using_bottom_nav_bar/android/app/build.gradle b/using_bottom_nav_bar/android/app/build.gradle
index 2838f21..13c95a4 100644
--- a/using_bottom_nav_bar/android/app/build.gradle
+++ b/using_bottom_nav_bar/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_custom_fonts/android/app/build.gradle b/using_custom_fonts/android/app/build.gradle
index 8065f03..8da4531 100644
--- a/using_custom_fonts/android/app/build.gradle
+++ b/using_custom_fonts/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_edittext/android/app/build.gradle b/using_edittext/android/app/build.gradle
index 7f50837..9c63ff0 100644
--- a/using_edittext/android/app/build.gradle
+++ b/using_edittext/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_gradient/android/app/build.gradle b/using_gradient/android/app/build.gradle
index 5eb9ae0..acba664 100644
--- a/using_gradient/android/app/build.gradle
+++ b/using_gradient/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_http_get/android/app/build.gradle b/using_http_get/android/app/build.gradle
index d02375d..50bbc59 100644
--- a/using_http_get/android/app/build.gradle
+++ b/using_http_get/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_listview/android/app/build.gradle b/using_listview/android/app/build.gradle
index 003e15d..4d31af6 100644
--- a/using_listview/android/app/build.gradle
+++ b/using_listview/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_snackbar/android/app/build.gradle b/using_snackbar/android/app/build.gradle
index 904021c..b743546 100644
--- a/using_snackbar/android/app/build.gradle
+++ b/using_snackbar/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_stepper/android/app/build.gradle b/using_stepper/android/app/build.gradle
index 9de335c..2d77be2 100644
--- a/using_stepper/android/app/build.gradle
+++ b/using_stepper/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_tabs/android/app/build.gradle b/using_tabs/android/app/build.gradle
index e2a570d..7587453 100644
--- a/using_tabs/android/app/build.gradle
+++ b/using_tabs/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'
diff --git a/using_theme/android/app/build.gradle b/using_theme/android/app/build.gradle
index 29113cb..152302e 100644
--- a/using_theme/android/app/build.gradle
+++ b/using_theme/android/app/build.gradle
@@ -16,7 +16,7 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '25.0.3'
+    
 
     lintOptions {
         disable 'InvalidPackage'