Example3-native updated for OpenCV Manager model

samples/android/tutorial-3-native/src/org/opencv/samples/tutorial3/Sample3Native.java

 package org.opencv.samples.tutorial3;
 
+import org.opencv.android.BaseLoaderCallback;
+import org.opencv.android.LoaderCallbackInterface;
+import org.opencv.android.OpenCVLoader;
+
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
@@ -10,6 +14,42 @@ import android.view.Window;
 public class Sample3Native extends Activity {
     private static final String TAG = "Sample::Activity";
     private Sample3View mView;
+    
+    private BaseLoaderCallback  mOpenCVCallBack = new BaseLoaderCallback(this) {
+    	@Override
+    	public void onManagerConnected(int status) {
+    		switch (status) {
+				case LoaderCallbackInterface.SUCCESS:
+				{
+					Log.i(TAG, "OpenCV loaded successfully");
+					
+					// Load native library after(!) OpenCV initialization
+					System.loadLibrary("native_sample");
+					
+					// Create and set View
+					mView = new Sample3View(mAppContext);
+					setContentView(mView);
+					// Check native OpenCV camera
+					if( !mView.openCamera() ) {
+						AlertDialog ad = new AlertDialog.Builder(mAppContext).create();
+						ad.setCancelable(false); // This blocks the 'BACK' button
+						ad.setMessage("Fatal error: can't open camera!");
+						ad.setButton("OK", new DialogInterface.OnClickListener() {
+						    public void onClick(DialogInterface dialog, int which) {
+							dialog.dismiss();
+							finish();
+						    }
+						});
+						ad.show();
+					}
+				} break;
+				default:
+				{
+					super.onManagerConnected(status);
+				} break;
+			}
+    	}
+	};
 
     public Sample3Native() {
         Log.i(TAG, "Instantiated new " + this.getClass());
@@ -19,14 +59,15 @@ public class Sample3Native extends Activity {
 	protected void onPause() {
         Log.i(TAG, "onPause");
 		super.onPause();
-		mView.releaseCamera();
+		if (null != mView)
+			mView.releaseCamera();
 	}
 
 	@Override
 	protected void onResume() {
         Log.i(TAG, "onResume");
 		super.onResume();
-		if( !mView.openCamera() ) {
+		if((null != mView) && !mView.openCamera() ) {
 			AlertDialog ad = new AlertDialog.Builder(this).create();  
 			ad.setCancelable(false); // This blocks the 'BACK' button  
 			ad.setMessage("Fatal error: can't open camera!");  
@@ -46,7 +87,11 @@ public class Sample3Native extends Activity {
         Log.i(TAG, "onCreate");
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
-        mView = new Sample3View(this);
-        setContentView(mView);
+
+        if (!OpenCVLoader.initAsync(OpenCVLoader.OPEN_CV_VERSION_2_4_0, this, mOpenCVCallBack))
+        {
+        	Log.e(TAG, "Cannot connect to OpenCV Manager");
+        	finish();
+        }
     }
 }

samples/android/tutorial-3-native/src/org/opencv/samples/tutorial3/Sample3View.java

@@ -26,9 +26,7 @@ class Sample3View extends SampleViewBase {
 			mBitmap.recycle();
 			mBitmap = null;
 		}
-		mRGBA = null;
-		
-		
+		mRGBA = null;	
 	}
 
     @Override
@@ -43,8 +41,4 @@ class Sample3View extends SampleViewBase {
     }
 
     public native void FindFeatures(int width, int height, byte yuv[], int[] rgba);
-
-    static {
-        System.loadLibrary("native_sample");
-    }
 }