Fixed: Android layerType should not be changed if there is no need

Resolves #1899

tests/app/App_Resources/Android/AndroidManifest.xml

@@ -24,6 +24,7 @@
 		android:allowBackup="true"
 		android:icon="@drawable/icon"
 		android:label="@string/app_name"
+		android:largeHeap="true"
 		android:theme="@style/AppTheme" >
 		<activity
 			android:name="com.tns.NativeScriptActivity"

tests/app/ui/view/view-tests.android.ts

@@ -296,4 +296,49 @@ export function checkNativeBackgroundImage(v: view.View): boolean {
     var bkg = <background.ad.BorderDrawable>(<android.view.View>v.android).getBackground();
 
     return bkg && bkg.background && !types.isNullOrUndefined(bkg.background.image);
-}
+}
+
+let SDK: number;
+function getSDK() {
+   if (!SDK) {
+       SDK = android.os.Build.VERSION.SDK_INT;
+   }
+
+   return SDK;
+}
+
+export function test_AndroidLayerType_BorderWidth() {
+   helper.buildUIAndRunTest(new labelModule.Label(), (views: Array<view.View>) => {
+       let lbl = <labelModule.Label>(views[0]);
+       let androidView = <android.view.View>lbl.android;
+       let originalLayerType = androidView.getLayerType();
+       lbl.borderWidth = 5;
+       TKUnit.assertEqual(androidView.getLayerType(), getSDK() < 18 ? android.view.View.LAYER_TYPE_SOFTWARE : originalLayerType);
+       lbl.borderWidth = 0;
+       TKUnit.assertEqual(androidView.getLayerType(), originalLayerType);
+   });
+};
+
+export function test_AndroidLayerType_BorderRadius() {
+   helper.buildUIAndRunTest(new labelModule.Label(), (views: Array<view.View>) => {
+       let lbl = <labelModule.Label>(views[0]);  
+       let androidView = <android.view.View>lbl.android;
+       let originalLayerType = androidView.getLayerType();
+       lbl.borderRadius = 5;
+       TKUnit.assertEqual(androidView.getLayerType(), getSDK() < 18 ? android.view.View.LAYER_TYPE_SOFTWARE : originalLayerType);
+       lbl.borderRadius = 0;
+       TKUnit.assertEqual(androidView.getLayerType(), originalLayerType);
+   });
+};
+
+export function test_AndroidLayerType_ClipPath() {
+   helper.buildUIAndRunTest(new labelModule.Label(), (views: Array<view.View>) => {
+       let lbl = <labelModule.Label>(views[0]);  
+       let androidView = <android.view.View>lbl.android;
+       let originalLayerType = androidView.getLayerType();
+       lbl.style.clipPath = "rect(0, 0, 100%, 100%)";
+       TKUnit.assertEqual(androidView.getLayerType(), getSDK() < 18 ? android.view.View.LAYER_TYPE_SOFTWARE : originalLayerType);
+       lbl.style.clipPath = undefined;
+       TKUnit.assertEqual(androidView.getLayerType(), originalLayerType);
+   });
+};

tns-core-modules/ui/styling/background.android.ts

@@ -225,8 +225,14 @@ export module ad {
 
     var _defaultBackgrounds = new Map<string, android.graphics.drawable.Drawable>();
 
+    interface CacheLayerType {
+        layerType: number;
+    }
+    
     export function onBackgroundOrBorderPropertyChanged(v: view.View) {
         var nativeView = <android.view.View>v._nativeView;
+        var cache = <CacheLayerType>v._nativeView;
+        
         if (!nativeView) {
             return;
         }
@@ -265,14 +271,12 @@ export module ad {
             bkg.background = backgroundValue;
             bkg.clipPath = clipPathValue;
 
-            if (getSDK() < 18) {
+            if ((v.borderWidth !== 0 || v.borderRadius !== 0 || clipPathValue) && getSDK() < 18) {
                 // Switch to software because of unsupported canvas methods if hardware acceleration is on:
                 // http://developer.android.com/guide/topics/graphics/hardware-accel.html
+                cache.layerType = nativeView.getLayerType();
                 nativeView.setLayerType(android.view.View.LAYER_TYPE_SOFTWARE, null);
             }
-            else {
-                nativeView.setLayerType(android.view.View.LAYER_TYPE_HARDWARE, null);
-            }
         }
         else {
             // reset the value with the default native value
@@ -287,9 +291,10 @@ export module ad {
                 }
             }
 
-            if (getSDK() < 18) {
+            if (cache.layerType !== undefined) {
-                // Reset layer type to hardware
+                // Reset layer type
-                nativeView.setLayerType(android.view.View.LAYER_TYPE_HARDWARE, null);
+                nativeView.setLayerType(cache.layerType, null);
+                cache.layerType = undefined;
             }
         }
 

tns-core-modules/ui/styling/style.ts

@@ -405,9 +405,11 @@ function isPaddingValid(value: number): boolean {
 
 var supportedPaths = ["rect", "circle", "ellipse", "polygon"];
 function isClipPathValid(value: string): boolean {
+    if (!value){
+        return true;
+    }
     var functionName = value.substring(0, value.indexOf("(")).trim();
-    
+    return supportedPaths.indexOf(functionName) !== -1;
-    return supportedPaths.indexOf(functionName) !== -1 || value === "";
 }
 
 function isMarginValid(value: number): boolean {
@@ -921,7 +923,7 @@ export class Style extends DependencyObservable implements styling.Style {
     }
 
     private _applyStyleProperty(property: Property, newValue: any) {
-
+        
         if (!this._view._shouldApplyStyleHandlers()) {
             return;
         }