Sample4-mixed was updated for OpenCV Manager model.

samples/android/tutorial-4-mixed/src/org/opencv/samples/tutorial4/Sample4Mixed.java

 package org.opencv.samples.tutorial4;
 
+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;
@@ -18,6 +22,42 @@ public class Sample4Mixed extends Activity {
     private MenuItem            mItemPreviewFeatures;
     private Sample4View         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("mixed_sample");
+					
+					// Create and set View
+					mView = new Sample4View(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 Sample4Mixed() {
         Log.i(TAG, "Instantiated new " + this.getClass());
@@ -27,14 +67,15 @@ public class Sample4Mixed 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!");  
@@ -53,9 +94,15 @@ public class Sample4Mixed extends Activity {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         Log.i(TAG, "onCreate");
+        
         requestWindowFeature(Window.FEATURE_NO_TITLE);
-        mView = new Sample4View(this);
-        setContentView(mView);
+        
+        Log.i(TAG, "Trying to load OpenCV library");
+        if (!OpenCVLoader.initAsync(OpenCVLoader.OPEN_CV_VERSION_2_4_0, this, mOpenCVCallBack))
+        {
+        	Log.e(TAG, "Cannot connect to OpenCV Manager");
+        	finish();
+        }
     }
 
     public boolean onCreateOptionsMenu(Menu menu) {

samples/android/tutorial-4-mixed/src/org/opencv/samples/tutorial4/Sample4View.java

@@ -104,11 +104,6 @@ class Sample4View extends SampleViewBase {
 
     public native void FindFeatures(long matAddrGr, long matAddrRgba);
 
-    static {
-	System.loadLibrary("opencv_java");
-        System.loadLibrary("mixed_sample");
-    }
-
     public void setViewMode(int viewMode) {
 		mViewMode = viewMode;
     }