diff --git a/application/application.android.ts b/application/application.android.ts
index 7c9cfbbe3..84d213f30 100644
--- a/application/application.android.ts
+++ b/application/application.android.ts
@@ -256,7 +256,7 @@ export class AndroidApplication extends observable.Observable implements definit
         ensureBroadCastReceiverClass();
         var that = this;
         var registerFunc = function (context: android.content.Context) {
-            var receiver = new BroadcastReceiverClass(onReceiveCallback);
+            var receiver: android.content.BroadcastReceiver = new BroadcastReceiverClass(onReceiveCallback);
             context.registerReceiver(receiver, new android.content.IntentFilter(intentFilter));
             that._registeredReceivers[intentFilter] = receiver;
         }
diff --git a/fps-meter/fps-meter.ts b/fps-meter/fps-meter.ts
index e912c3861..cba2d6c7d 100644
--- a/fps-meter/fps-meter.ts
+++ b/fps-meter/fps-meter.ts
@@ -29,7 +29,7 @@ function doFrame(currentTimeMillis: number) {
     }
 }
 
-var native;
+var native: fpsNative.FPSCallback;
 function ensureNative() {
     if (!native) {
         native = new fpsNative.FPSCallback(doFrame);
diff --git a/http/http-request.android.ts b/http/http-request.android.ts
index da974bc3a..a532260f6 100644
--- a/http/http-request.android.ts
+++ b/http/http-request.android.ts
@@ -12,7 +12,7 @@ import http = require("http");
 var requestIdCounter = 0;
 var pendingRequests = {};
 
-var completeCallback;
+var completeCallback: com.tns.Async.CompleteCallback;
 function ensureCompleteCallback() {
     if (completeCallback) {
         return;
diff --git a/text/span.android.ts b/text/span.android.ts
index f70e45fa4..ae6f43726 100644
--- a/text/span.android.ts
+++ b/text/span.android.ts
@@ -64,7 +64,7 @@ export class Span extends spanCommon.Span {
                 (realFontAttributes & enums.FontAttributes.Italic) ? enums.FontStyle.italic : enums.FontStyle.normal,
                 (realFontAttributes & enums.FontAttributes.Bold) ? enums.FontWeight.bold : enums.FontWeight.normal);
             ensureCustomTypefaceSpanClass();
-            let typefaceSpan = new CustomTypefaceSpanClass(realFontFamily, font.getAndroidTypeface());
+            let typefaceSpan: android.text.style.TypefaceSpan = new CustomTypefaceSpanClass(realFontFamily, font.getAndroidTypeface());
             this.spanModifiers.push(typefaceSpan);
         }
         var realFontSize = this.fontSize ||
diff --git a/ui/animation/animation.android.ts b/ui/animation/animation.android.ts
index 6125a41e7..b8c6ecff4 100644
--- a/ui/animation/animation.android.ts
+++ b/ui/animation/animation.android.ts
@@ -15,7 +15,7 @@ function ensureFloatType() {
     }
 }
 
-var argbEvaluator;
+var argbEvaluator: android.animation.ArgbEvaluator;
 function ensureArgbEvaluator() {
     if (!argbEvaluator) {
         argbEvaluator = new android.animation.ArgbEvaluator();
diff --git a/ui/image-cache/image-cache.android.ts b/ui/image-cache/image-cache.android.ts
index 0e3552ae8..5c1e06af8 100644
--- a/ui/image-cache/image-cache.android.ts
+++ b/ui/image-cache/image-cache.android.ts
@@ -30,7 +30,7 @@ function ensureLruBitmapCacheClass() {
 
 export class Cache extends common.Cache {
     private _callback: any;
-    private _cache;
+    private _cache: android.util.LruCache<string, android.graphics.Bitmap>;
 
     constructor() {
         super();
@@ -38,7 +38,6 @@ export class Cache extends common.Cache {
         ensureLruBitmapCacheClass();
         var maxMemory = java.lang.Runtime.getRuntime().maxMemory() / 1024;
         var cacheSize = maxMemory / 8;
-        //console.log("cacheSize: " + cacheSize);
         this._cache = new LruBitmapCacheClass(cacheSize);
 
         var that = new WeakRef(this);
diff --git a/ui/page/page.android.ts b/ui/page/page.android.ts
index 7cdb27ef5..71271bb53 100644
--- a/ui/page/page.android.ts
+++ b/ui/page/page.android.ts
@@ -123,7 +123,7 @@ export class Page extends pageCommon.Page {
     }
 
     /* tslint:disable */
-    private _dialogFragment;
+    private _dialogFragment: android.app.DialogFragment;
     /* tslint:enable */
     protected _showNativeModalView(parent: Page, context: any, closeCallback: Function, fullscreen?: boolean) {
         super._showNativeModalView(parent, context, closeCallback, fullscreen);
diff --git a/ui/segmented-bar/segmented-bar.android.ts b/ui/segmented-bar/segmented-bar.android.ts
index a705090f2..860427937 100644
--- a/ui/segmented-bar/segmented-bar.android.ts
+++ b/ui/segmented-bar/segmented-bar.android.ts
@@ -88,7 +88,7 @@ function onItemsPropertyChanged(data: dependencyObservable.PropertyChangeData) {
 
                 var arr = java.lang.reflect.Array.newInstance(java.lang.Integer.class.getField("TYPE").get(null), 1);
                 arr[0] = R_ATTR_STATE_SELECTED;
-                var colorDrawable = new SegmentedBarColorDrawableClass(view.selectedBackgroundColor.android)
+                var colorDrawable: android.graphics.drawable.ColorDrawable = new SegmentedBarColorDrawableClass(view.selectedBackgroundColor.android)
                 stateDrawable.addState(arr, colorDrawable);
                 stateDrawable.setBounds(0, 15, vg.getRight(), vg.getBottom());
 
@@ -128,6 +128,8 @@ function ensureSegmentedBarColorDrawableClass() {
             canvas.drawRect(0, this.getBounds().height() - 15, this.getBounds().width(), this.getBounds().height(), p);
         }
     }
+
+    SegmentedBarColorDrawableClass = SegmentedBarColorDrawable;
 }
 
 export class SegmentedBarItem extends common.SegmentedBarItem {
@@ -144,7 +146,7 @@ export class SegmentedBarItem extends common.SegmentedBarItem {
 }
 
 export class SegmentedBar extends common.SegmentedBar {
-    private _android;
+    private _android: android.widget.TabHost;
     public _listener: android.widget.TabHost.OnTabChangeListener;
 
     public _createUI() {
diff --git a/ui/tab-view/tab-view.android.ts b/ui/tab-view/tab-view.android.ts
index f412a405a..4c5e77c2f 100644
--- a/ui/tab-view/tab-view.android.ts
+++ b/ui/tab-view/tab-view.android.ts
@@ -186,7 +186,7 @@ export class TabView extends common.TabView {
     private _pagerAdapter: android.support.v4.view.PagerAdapter;
     private _androidViewId: number;
 
-    private _pageChagedListener;
+    private _pageChagedListener: android.support.v4.view.ViewPager.SimpleOnPageChangeListener;
 
     get android(): android.view.View {
         return this._grid;
diff --git a/utils/debug.ts b/utils/debug.ts
index e1ffb4027..d8913b391 100644
--- a/utils/debug.ts
+++ b/utils/debug.ts
@@ -3,7 +3,7 @@ import { knownFolders } from "file-system"
 export var debug = true;
 
 // TODO: Get this from the runtimes...
-var applicationRootPath;
+var applicationRootPath: string;
 function ensureAppRootPath() {
     if (!applicationRootPath) {
         applicationRootPath = knownFolders.currentApp().path;