Added base Android Java sample

samples/android/0-base/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="gen"/>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

samples/android/0-base/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Sample 0 base</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ApkBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

samples/android/0-base/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.opencv.samples"
+      android:versionCode="1"
+      android:versionName="1.0">
+
+    <supports-screens android:resizeable="true"
+                      android:smallScreens="true" 
+                      android:normalScreens="true" 
+                      android:largeScreens="true" 
+                      android:anyDensity="true" />
+
+    <application android:label="@string/app_name" android:icon="@drawable/icon">
+        <activity android:name="Sample0Base"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+    
+    <uses-sdk android:minSdkVersion="8" />
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-feature android:name="android.hardware.camera" />
+    <uses-feature android:name="android.hardware.camera.autofocus" />
+
+</manifest> 

samples/android/0-base/default.properties

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+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "build.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-8

samples/android/0-base/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Sample 0: base</string>
+</resources>

samples/android/0-base/src/org/opencv/samples/Sample0Base.java

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+package org.opencv.samples;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.Window;
+
+public class Sample0Base extends Activity {
+    private static final String TAG = "Sample0Base::Activity";
+    
+	public static final int view_mode_rgba = 0;
+	public static final int view_mode_gray = 1;
+	
+	private MenuItem item_preview_rgba;
+	private MenuItem item_preview_gray;
+	
+	public int view_mode;
+	
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+        setContentView( new Sample0View(this) );
+        view_mode = view_mode_rgba;
+    }
+    
+    public boolean onCreateOptionsMenu(Menu menu) {
+    	item_preview_rgba = menu.add("Preview RGBA");
+    	item_preview_gray = menu.add("Preview GRAY");
+		return true;
+    }
+    
+    public boolean onOptionsItemSelected (MenuItem item) {
+    	Log.i(TAG, "Menu Item selected " + item);
+    	if (item == item_preview_rgba)
+    		view_mode = view_mode_rgba;
+    	else if (item == item_preview_gray)
+    		view_mode = view_mode_gray;
+		return true;
+    }
+}

samples/android/0-base/src/org/opencv/samples/Sample0View.java

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+package org.opencv.samples;
+
+import java.util.List;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.hardware.Camera;
+import android.hardware.Camera.PreviewCallback;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+
+class Sample0View extends SurfaceView implements SurfaceHolder.Callback, Runnable{
+    private static final String TAG = "Sample0Base::View";
+    
+    private Camera camera;
+    private SurfaceHolder holder;
+    private int frame_width;
+    private int frame_height;
+    private byte[] frame;
+    
+    private boolean mThreadRun;
+   
+
+	public Sample0View(Context context) {
+		super(context);
+		holder = getHolder();
+		holder.addCallback(this);
+	}
+	
+
+	public void surfaceChanged(SurfaceHolder _holder, int format, int width, int height) {
+        if ( camera != null) {
+            Camera.Parameters params = camera.getParameters();
+            List<Camera.Size> sizes = params.getSupportedPreviewSizes();
+            frame_width = width;
+            frame_height = height;
+            
+        	//selecting optimal camera preview size
+            {
+                double minDiff = Double.MAX_VALUE;
+                for (Camera.Size size : sizes) {
+                    if (Math.abs(size.height - height) < minDiff) {
+                    	frame_width = size.width;
+                    	frame_height = size.height;
+                        minDiff = Math.abs(size.height - height);
+                    }
+                }
+            }
+            params.setPreviewSize(frame_width, frame_height);
+            camera.setParameters(params);
+        	camera.startPreview();
+        }
+    }
+
+	public void surfaceCreated(SurfaceHolder holder) {
+		camera = Camera.open();
+		camera.setPreviewCallback(
+			new PreviewCallback() {
+				public void onPreviewFrame(byte[] data, Camera camera) {
+					synchronized(Sample0View.this)
+					{
+						frame = data;
+						Sample0View.this.notify();
+					}
+				}
+			}
+		);
+    	(new Thread(this)).start();
+	}
+
+	public void surfaceDestroyed(SurfaceHolder holder) {
+		mThreadRun = false;
+		if(camera != null) {
+			camera.stopPreview();
+			camera.setPreviewCallback(null);
+			camera.release();
+			camera = null;
+		}
+	}
+
+	public void run() {
+		mThreadRun = true;
+		Log.i(TAG, "Starting thread");
+		while(mThreadRun) {
+			byte[] data = null;
+			synchronized(this)
+			{
+				try {
+					this.wait();
+					data = frame;
+				} catch (InterruptedException e) {
+					e.printStackTrace();
+				}
+			}
+			
+			Canvas canvas = holder.lockCanvas();
+			
+			int frameSize = frame_width*frame_height;
+			int[] rgba = new int[frameSize];
+			
+			Sample0Base a = (Sample0Base)getContext();
+			int view_mode = a.view_mode;
+			if(view_mode == Sample0Base.view_mode_gray) {
+				for(int i = 0; i < frameSize; i++) {
+					int y = (0xff & ((int)data[i]));
+					rgba[i] = 0xff000000 + (y << 16) + (y << 8) + y;
+				}
+			}
+			else if (view_mode == Sample0Base.view_mode_rgba) {
+				for(int i = 0; i < frame_height; i++)
+					for(int j = 0; j < frame_width; j++) {
+						int y = (0xff & ((int)data[i*frame_width+j]));
+						int u = (0xff & ((int)data[frameSize + (i >> 1) * frame_width + (j & ~1) + 0]));
+						int v = (0xff & ((int)data[frameSize + (i >> 1) * frame_width + (j & ~1) + 1]));
+						if (y < 16) y = 16;
+						
+						int r = Math.round(1.164f * (y - 16) + 1.596f * (v - 128)                     );
+						int g = Math.round(1.164f * (y - 16) - 0.813f * (v - 128) - 0.391f * (u - 128));
+						int b = Math.round(1.164f * (y - 16)                      + 2.018f * (u - 128));
+						
+						if (r < 0) r = 0; if (r > 255) r = 255;
+						if (g < 0) g = 0; if (g > 255) g = 255;
+						if (b < 0) b = 0; if (b > 255) b = 255;
+						
+						rgba[i*frame_width+j] = 0xff000000 + (b << 16) + (g << 8) + r;
+					}
+			}
+			
+			Bitmap bmp = Bitmap.createBitmap(frame_width, frame_height, Bitmap.Config.ARGB_8888);
+			bmp.setPixels(rgba, 0/*offset*/, frame_width /*stride*/, 0, 0, frame_width, frame_height);
+			
+			canvas.drawBitmap(bmp, (canvas.getWidth()-frame_width)/2, (canvas.getHeight()-frame_height)/2, null);
+			holder.unlockCanvasAndPost(canvas);
+			}
+	}
+}