fix:when onDestroy call native plugin

doric-android/doric/src/main/java/pub/doric/DoricContext.java

@@ -163,17 +163,29 @@ public class DoricContext {
     }
 
     public void teardown() {
-        callEntity(DoricConstant.DORIC_ENTITY_DESTROY);
-        getDriver().asyncCall(new Callable<Object>() {
+        callEntity(DoricConstant.DORIC_ENTITY_DESTROY).setCallback(new AsyncResult.Callback<JSDecoder>() {
             @Override
-            public Object call() {
-                for (DoricJavaPlugin javaPlugin : mPluginMap.values()) {
-                    javaPlugin.onTearDown();
-                }
-                mPluginMap.clear();
-                return null;
+            public void onResult(JSDecoder result) {
             }
-        }, ThreadMode.UI);
+
+            @Override
+            public void onError(Throwable t) {
+            }
+
+            @Override
+            public void onFinish() {
+                getDriver().asyncCall(new Callable<Object>() {
+                    @Override
+                    public Object call() {
+                        for (DoricJavaPlugin javaPlugin : mPluginMap.values()) {
+                            javaPlugin.onTearDown();
+                        }
+                        mPluginMap.clear();
+                        return null;
+                    }
+                }, ThreadMode.UI);
+            }
+        });
         DoricContextManager.getInstance().destroyContext(this);
     }
 

doric-android/doric/src/main/java/pub/doric/DoricContextManager.java

@@ -57,7 +57,6 @@ public class DoricContextManager {
     }
 
     AsyncResult<Boolean> destroyContext(final DoricContext context) {
-        doricContextMap.remove(context.getContextId());
         final AsyncResult<Boolean> result = new AsyncResult<>();
         context.getDriver().destroyContext(context.getContextId()).setCallback(new AsyncResult.Callback<Boolean>() {
             @Override
@@ -72,6 +71,7 @@ public class DoricContextManager {
 
             @Override
             public void onFinish() {
+                doricContextMap.remove(context.getContextId());
             }
         });
         return result;

doric-android/doric/src/main/java/pub/doric/shader/ImageNode.java

@@ -17,7 +17,6 @@ package pub.doric.shader;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
-import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.graphics.Matrix;