fixing build and lint warnings

modules/java/android_lib/lint.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <lint>
+    <issue id="InlinedApi">
+        <ignore path="src\org\opencv\android\JavaCameraView.java" />
+    </issue>
     <issue id="NewApi">
         <ignore path="src\org\opencv\android\JavaCameraView.java" />
     </issue>

modules/java/generator/src/java/android+CameraBridgeViewBase.java

@@ -74,6 +74,7 @@ public abstract class CameraBridgeViewBase extends SurfaceView implements Surfac
         getHolder().addCallback(this);
         mMaxWidth = MAX_UNSPECIFIED;
         mMaxHeight = MAX_UNSPECIFIED;
+        styledAttrs.recycle();
     }
 
     public interface CvCameraViewListener {
@@ -155,8 +156,6 @@ public abstract class CameraBridgeViewBase extends SurfaceView implements Surfac
             mPreviewFormat = format;
         }
 
-        private CvCameraViewListenerAdapter() {}
-
         private int mPreviewFormat = Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA;
         private CvCameraViewListener mOldStyleListener;
     };

modules/java/generator/src/java/android+JavaCameraView.java

@@ -267,9 +267,6 @@ public class JavaCameraView extends CameraBridgeViewBase implements PreviewCallb
             mRgba.release();
         }
 
-        private JavaCameraFrame(CvCameraViewFrame obj) {
-        }
-
         private Mat mYuvFrameData;
         private Mat mRgba;
         private int mWidth;

modules/java/generator/src/java/android+NativeCameraView.java

@@ -131,17 +131,17 @@ public class NativeCameraView extends CameraBridgeViewBase {
         }
     }
 
-    private class NativeCameraFrame implements CvCameraViewFrame {
+    private static class NativeCameraFrame implements CvCameraViewFrame {
 
         @Override
         public Mat rgba() {
-            mCamera.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
+            mCapture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
             return mRgba;
         }
 
         @Override
         public Mat gray() {
-            mCamera.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME);
+            mCapture.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME);
             return mGray;
         }
 
@@ -158,9 +158,6 @@ public class NativeCameraView extends CameraBridgeViewBase {
 
     private class CameraWorker implements Runnable {
 
-        private Mat mRgba = new Mat();
-        private Mat mGray = new Mat();
-
         public void run() {
             do {
                 if (!mCamera.grab()) {

samples/android/native-activity/src/org/opencv/samples/NativeActivity/CvNativeActivity.java

@@ -6,7 +6,6 @@ import org.opencv.android.OpenCVLoader;
 
 import android.app.Activity;
 import android.content.Intent;
-import android.os.Bundle;
 import android.util.Log;
 
 public class CvNativeActivity extends Activity {

samples/android/tutorial-1-camerapreview/res/layout/tutorial1_surface_view.xml

-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:opencv="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ -20,4 +20,4 @@
         opencv:show_fps="true"
         opencv:camera_id="any" />
 
-</LinearLayout>
+</FrameLayout>