adding displaying FPS

samples/android/tutorial-4-opencl/res/layout/activity.xml

-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context="${relativePackage}.${activityClass}" >
+    android:layout_height="match_parent" >
+
+    <org.opencv.samples.tutorial4.MyGLSurfaceView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:id="@+id/my_gl_surface_view" />
 
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="@string/app_name" />
+        android:id="@+id/fps_text_view"
+        android:text="FPS:" />
 
-</RelativeLayout>
+</FrameLayout>

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/MyGLRendererBase.java

@@ -6,7 +6,11 @@ import javax.microedition.khronos.opengles.GL10;
 import android.graphics.SurfaceTexture;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Log;
+import android.view.View;
+import android.widget.TextView;
 
 public abstract class MyGLRendererBase implements GLSurfaceView.Renderer, SurfaceTexture.OnFrameAvailableListener {
     protected final String LOGTAG = "MyGLRendererBase";
@@ -15,6 +19,7 @@ public abstract class MyGLRendererBase implements GLSurfaceView.Renderer, Surfac
 
     protected SurfaceTexture mSTex;
     protected MyGLSurfaceView mView;
+    protected TextView mFpsText;
 
     protected boolean mGLInit = false;
     protected boolean mTexUpdate = false;
@@ -27,6 +32,11 @@ public abstract class MyGLRendererBase implements GLSurfaceView.Renderer, Surfac
     protected abstract void closeCamera();
     protected abstract void setCameraPreviewSize(int width, int height);
 
+    public void setFpsTextView(TextView fpsTV)
+    {
+        mFpsText = fpsTV;
+    }
+
     public void onResume() {
         Log.i(LOGTAG, "onResume");
         frameCounter = 0;
@@ -70,8 +80,16 @@ public abstract class MyGLRendererBase implements GLSurfaceView.Renderer, Surfac
         frameCounter++;
         if(frameCounter >= 10)
         {
-            int fps = (int) (frameCounter * 1e9 / (System.nanoTime() - lastNanoTime));
+            final int fps = (int) (frameCounter * 1e9 / (System.nanoTime() - lastNanoTime));
             Log.i(LOGTAG, "drawFrame() FPS: "+fps);
+            if(mFpsText != null) {
+                Runnable fpsUpdater = new Runnable() {
+                    public void run() {
+                        mFpsText.setText("FPS: " + fps);
+                    }
+                };
+                new Handler(Looper.getMainLooper()).post(fpsUpdater);
+            }
             frameCounter = 0;
             lastNanoTime = System.nanoTime();
         }

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/MyGLSurfaceView.java

@@ -2,14 +2,16 @@ package org.opencv.samples.tutorial4;
 
 import android.content.Context;
 import android.opengl.GLSurfaceView;
+import android.util.AttributeSet;
 import android.view.SurfaceHolder;
+import android.widget.TextView;
 
-class MyGLSurfaceView extends GLSurfaceView {
+public class MyGLSurfaceView extends GLSurfaceView {
 
     MyGLRendererBase mRenderer;
 
-    MyGLSurfaceView(Context context) {
-        super(context);
+    public MyGLSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
 
         if(android.os.Build.VERSION.SDK_INT >= 21)
             mRenderer = new Camera2Renderer(this);
@@ -21,6 +23,10 @@ class MyGLSurfaceView extends GLSurfaceView {
         setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
     }
 
+    public void setFpsTextView(TextView tv) {
+        mRenderer.setFpsTextView(tv);
+    }
+
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         super.surfaceCreated(holder);

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/Tutorial4Activity.java

@@ -5,6 +5,7 @@ import android.content.pm.ActivityInfo;
 import android.os.Bundle;
 import android.view.Window;
 import android.view.WindowManager;
+import android.widget.TextView;
 
 public class Tutorial4Activity extends Activity {
 
@@ -20,8 +21,12 @@ public class Tutorial4Activity extends Activity {
                 WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
 
-        mView = new MyGLSurfaceView(this);
-        setContentView(mView);
+        //mView = new MyGLSurfaceView(this, null);
+        //setContentView(mView);
+        setContentView(R.layout.activity);
+        mView = (MyGLSurfaceView) findViewById(R.id.my_gl_surface_view);
+        TextView tv = (TextView)findViewById(R.id.fps_text_view);
+        mView.setFpsTextView(tv);
     }
 
     @Override