Rename the files

tns-core-modules/fps-meter/fps-native.android.ts

@@ -0,0 +1,48 @@
+import definition = require("fps-meter/fps-native"); 
+
+export class FPSCallback implements definition.FPSCallback {
+    private impl: android.view.Choreographer.FrameCallback;
+    private onFrame: (currentTimeMillis: number) => void;
+
+    public running: boolean;
+
+    constructor(onFrame: (currentTimeMillis: number) => void) {
+        this.running = false;
+        this.onFrame = onFrame;
+
+        this.impl = new android.view.Choreographer.FrameCallback({
+            doFrame: (nanos: number) => {
+                this.handleFrame(nanos);
+            }
+        });
+    }
+
+    public start() {
+        if (this.running) {
+            return;
+        }
+
+        android.view.Choreographer.getInstance().postFrameCallback(this.impl);
+        this.running = true;
+    }
+
+    public stop() {
+        if (!this.running) {
+            return;
+        }
+
+        android.view.Choreographer.getInstance().removeFrameCallback(this.impl);
+        this.running = false;
+    }
+
+    private handleFrame(nanos: number) {
+        if (!this.running) {
+            return;
+        }
+
+        // divide by 1 000 000 since the parameter is in nanoseconds
+        this.onFrame(nanos / 1000000);
+        // add the FrameCallback instance again since it is automatically removed from the Choreographer
+        android.view.Choreographer.getInstance().postFrameCallback(this.impl);
+    }
+}