Fix to allow Flappy Bird to build and run

android/app/activity.nim

@@ -11,6 +11,8 @@ jclass android.app.Activity* of ContextWrapper:
     proc getApplication*(): Application
     proc getWindowManager*(): WindowManager
     proc onCreate*(savedInstanceState: Bundle)
+    proc onResume*()
+    proc onPause*()
     proc setContentView*(v: View)
 
 var gCurrentActivity {.threadvar.}: Activity
@@ -22,11 +24,9 @@ proc setCurrentActivity*(a: Activity) =
 proc getSDLMainActivity(): Activity =
     let cls = JVMClass.getByFqcn("org/libsdl/app/SDLActivity")
     if not cls.isNil:
-        let meth = cls.getStaticMethodId("getContext", "()Landroid/content/Context;")
-        if not cast[pointer](meth).isNil:
-            let j = cls.callObjectMethodRaw(meth, [])
-            if not j.isNil:
-                result = Activity.fromJObject(j)
+        let j = cls.callMethod(jobject, "getContext", "()Landroid/content/Context;")
+        if not j.isNil:
+            result = Activity.fromJObject(j)
 
 proc currentActivityIfPresent*(): Activity =
     if gCurrentActivity.isNil:

android/graphics/canvas.nim

@@ -0,0 +1,8 @@
+import jnim
+import android/graphics/Paint
+
+jclass android.graphics.Canvas* of JVMObject:
+  proc drawPaint*(paint: Paint)
+  proc drawRect*(left: jfloat, top: jfloat, right: jfloat, bottom: jfloat, 
+                paint: Paint)
+  proc drawCircle*(cx: jfloat, cy: jfloat, radius: jfloat, paint: Paint)

android/graphics/paint.nim

@@ -0,0 +1,5 @@
+import jnim
+
+jclass android.graphics.Paint* of JVMObject:
+  proc new*
+  proc setColor*(color: jint)

android/view/input_event.nim

@@ -0,0 +1,3 @@
+import jnim
+
+jclassDef android.view.InputEvent* of JVMObject

android/view/motion_event.nim

@@ -1,2 +1,5 @@
 import jnim
 
+import android/view/input_event
+
+jclassDef android.view.MotionEvent* of InputEvent

android/view/surface.nim

@@ -0,0 +1,4 @@
+import jnim
+
+jclass android.view.Surface* of JVMObject:
+  proc isValid*(): jboolean

android/view/surface_holder.nim

@@ -1,5 +1,21 @@
 import jnim
+import android/graphics/canvas
+import android/view/surface
 
-jclass android.view.SurfaceHolder* of JVMObject:
-    proc setFixedSize*(width, height: jint)
+jclassDef android.view.SurfaceHolder* of JVMObject
+jclassDef android.view.`SurfaceHolder$Callback`* of JVMObject
 
+type
+  SurfaceHolderCallback* = `SurfaceHolder$Callback`
+
+jclassImpl android.view.SurfaceHolder* of JVMObject:
+  proc setFixedSize*(width, height: jint)
+  proc getSurface*: Surface
+  proc lockCanvas*: Canvas
+  proc unlockCanvasAndPost*(canvas: Canvas)
+  proc addCallback*(callback: SurfaceHolderCallback)
+
+jclassImpl android.view.`SurfaceHolder$Callback`* of JVMObject:
+  proc surfaceCreated*(holder: SurfaceHolder)
+  proc surfaceChanged*(holder: SurfaceHolder, format: jint, width: jint, height: jint)
+  proc surfaceDestroyed*(holder: SurfaceHolder)

android/view/surface_view.nim

@@ -1,5 +1,6 @@
 import jnim
-import android/view/[view, surface_holder]
+import android/view/[view, surface_holder, motion_event]
 
-jclass android.view.SurfaceView* of View:
-    proc getHolder*(): SurfaceHolder
+jclass android.view.SurfaceView* extends View:
+    proc getHolder*: SurfaceHolder
+    proc onTouchEvent*(evt: MotionEvent): jboolean