Android :: Camera Application With Compass Direction Overlay?

Jul 12, 2010

I'm a bit new to Android but after searching on the Market, the web and this forum, I can't seem to find anything like this but I feel like it has to exist (or hopefully will soon). I'm looking for a camera application that can place the current compass direction on the image (and stamp the saved image with the direction). The tilt of the phone would be cool to have, too, but just the compass would be great. I did find an application that shows the compass direction on over top of a feed from the camera ("Reality + Compass" by Udell Enterprises).

I want something just like this, but with the ability to save the image. In case you're wondering, I'd like to use this for bettering the storm spotting community. A problem when people send in images of clouds/storms/tornadoes/etc is that you never know (1) where the picture was taken and (2) in what direction. Ideally GPS location could be added, too, but for now I just want the compass. (Other image services can handle the location part fine, like Twitter for Android/Twitpic.)

(I'm on the HTC Aria, but I can sideload apps now thanks to the new version of HTC Sync.)

Android :: Camera Application with Compass Direction Overlay?


Android :: Finding Direction Using Compass Interface

Jan 11, 2010

I need to know if there is an interface to access the direction in which the phone is pointing.

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Android :: Compass Pointing Direction Other Than North

Sep 16, 2010

I'm trying to implement something that I don't even know if it's possible. So I have this class which implements a SensorEventListener like this:
private SensorEventListener mySensorEventListener = new SensorEventListener(){
@Override public void onAccuracyChanged(Sensor sensor, int accuracy) {
} @Override public void onSensorChanged(SensorEvent event) {
myCompass.updateDirection((float)event.values[0]); } };

And a class that handles the way the compass looks like this:
public static class compassLook extends View {
private Paint paintPointer = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint paintCircle = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint paintLeters = new Paint(Paint.ANTI_ALIAS_FLAG);
private boolean firstDraw; private float direction = 0 ;
public compassLook(Context context) { super(context); init();
} public compassLook(Context context, AttributeSet attrs) { super(context, attrs); init();
} public compassLook(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle); init(); } private void init(){
paintPointer.setStyle(Paint.Style.STROKE); paintPointer.setStrokeWidth(3);
paintPointer.setColor(Color.argb(255, 209, 114, 2)); paintCircle.setStyle(Paint.Style.STROKE);
paintCircle.setStrokeWidth(2); paintCircle.setColor(Color.argb(150, 255, 255, 255));
paintLeters.setStyle(Paint.Style.STROKE); paintLeters.setStrokeWidth(1);
paintLeters.setColor(Color.argb(230, 255, 255, 255)); paintLeters.setTextSize(12);
firstDraw = true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
MeasureSpec.getSize(heightMeasureSpec)); } @Override protected void onDraw(Canvas canvas) {
int cxCompass = (getMeasuredWidth()/2); int cyCompass = (getMeasuredHeight()/2);
float radiusCompass; if(cxCompass > cyCompass){ radiusCompass = (float) (cyCompass * 0.9);
} else{ radiusCompass = (float) (cxCompass * 0.9);}
canvas.drawCircle(cxCompass-50, cyCompass, radiusCompass, paintCircle);
if(!firstDraw){ // Desenho da linha que aponta canvas.drawLine(cxCompass-50, cyCompass,
(float)(cxCompass-50 + radiusCompass * Math.sin((double)(- direction) * 3.14/180)),
(float)(cyCompass - radiusCompass * Math.cos((double)(-direction) * 3.14/180)),
paintPointer); double mLatitude = (mLocation.getLatitude() / 1E6);
// I get this value from a LM request double mLongitude = (mLocation.getLongitude() / 1E6);
// I get this value from a LM request double picLatitude= Double.parseDouble(picLatitudeString);
// I get this value from a bundle double picLongitude = Double.parseDouble(picLongitudeString);
// I get this value from a bundle float direction = (float)
Math.toDegrees(Math.atan2(picLongitude- mLongitude, picLatitude-mLatitude));
float distancia = (float) (Math.sqrt(Math.pow(mLatitude- picLatitude,
2) + Math.pow(mLongitude-picLongitude,2)))/2;
//Desenho do texto que indica a distancia
canvas.drawText(String.valueOf(distancia) + "Km", cxCompass-30,
cyCompass+20, paintLeters); } } public void updateDirection(float dir)
{ firstDraw = false; direction = dir; invalidate(); } }

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Android :: Getting Compass Values And Use It On Map Overlay

Sep 13, 2010

I have a marker on the map using an Overlay. I also have access to the compass sensor which I'm able to show a textView with the orientation values (0 to 359). How can I apply this values to the marker? (which is a drawable). I already have a MAtrix created but when I insert the orientation value gives me an error, here it is:

GeoPoint geopoint = new GeoPoint((int) (newLocation.getLatitude() * 1E6),
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Point pt = new Point(); mapView.getProjection().toPixels(geopoint, pt);
Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.user2);
Matrix matrix = new Matrix(); matrix.postTranslate(-25, -25);
matrix.postRotate(direction); matrix.postTranslate(pt.x, pt.y);
paint.setAntiAlias(true); paint.setFilterBitmap(true);
int width = bmp.getWidth(); int height = bmp.getHeight();
Bitmap changedBitmap = Bitmap.createBitmap(bmp, 0, 0, width, height, matrix, true);
BitmapDrawable icon = new BitmapDrawable(changedBitmap);
icon.setBounds(0, 0, icon.getIntrinsicWidth(), icon.getIntrinsicHeight());
userOverlay useroverlay = new userOverlay(icon); useroverlay.addItem(item);

I used the value retrieved from the sensor on "direction" but it doesn't work.

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Android :: How Can I Replace Compass Image Of Location Overlay?

Aug 24, 2010

I want to use my image to replace the Compass image of MyLocationOverlay, how can i implement?

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Android :: My Location Overlay - Customizing Compass Position On Screen?

Nov 3, 2010

I am using these three lines to add a compass on the MapView: mMyLocationOverlay = new MyLocationOverlay (this,mapView);mMyLocationOverlay. enableCompass(); mapView.getOverlays() .add(mMyLocation Overlay) ; However the default position of the compass showing on the screen is not too good for my apps, and I want to move it to somewhere else. Anyone knows how I can achieve that?

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How To Get Camera Direction Of GPS Enabled Phone

Nov 21, 2011

How to get Camera direction of GPS enabled phone?

All i found about GPS is that it just tells the location of the device, how do one get the direction where camera is pointing with GPS enabled phone?

For example, I need to see the camera api and work out which direction the camera is pointing. So that I can see the direction I'm viewing. In the other word, it is work like a compass.

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Android :: AR Get Rotation Matrix / Camera Overlay?

Feb 23, 2010

I spend two weeks now trying to get this working with no success. Here is what I want to do: I have several geo points around the user and his phone. I want to display this point overlaying them on the input from the camera (kind of standard AR (Augmented Reality) app). Part of my requirements are that the user can use the phone in either landscape or portrait mode.My plan was like this.
1. Register for Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD 2. Pass the result to Sensor Manager.getRotationMatrix(), getting back the R matrix that should be telling me how to translate points from the Phone coordinate system (defined here: to World coordinate system (x -> East, y -> North, z -> Sky) 3. I want to translate points from World to Phone so I take the inverse of R (I'm using Matrix.invertM()) to get R_In 4. Using the GPS I translate the geo points I want to display on the camera to points in the World coordinate system and then I run them through the R_In matrix to get their coordinates in the Phone system. 5. Draw the points in the screen only if the have (phone coordinates) z < 0 and x and y such that they are visible. This is my grand plan... however I have problems quite early (2). I do get the R matrix back and it looks good when I align the phone to the world coordinate system ( I get the identity matrix ). However when I try to translate an imaginary point from the Phone coordinate system say (0, 1, 0) to the World coordinate system I don't get the numbers I expect.

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Jan 30, 2009

Does someone know how I can overlay an image over the camera preview?

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Aug 10, 2010

I'm passing a bitmap through a bundle to an activity which I called cameraView on which the user has access to the camera of the device. I'd like to overlay that bitmap with transparency using the camera as the background. Is it possible? to put the bitmap in front of the camera? And how can I change the transparency level? Here is my code: This is the camview.xml:

<RelativeLayout xmlns:android=""
android:layout_width="fill_parent" android:layout_height="fill_parent"
<SurfaceView android:id="@+id/surface_camera" android:layout_width="fill_parent"
android:layout_height="10dip" android:layout_weight="1"> </SurfaceView> </RelativeLayout>

And this is the java:
public class cameraView extends Activity implements SurfaceHolder.Callback{
SurfaceView mSurfaceView; SurfaceHolder mSurfaceHolder;
Camera mCamera; boolean mPreviewRunning=false; private Context mContext = this;
public void onCreate(Bundle icicle) { super.onCreate(icicle);
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} Camera.Parameters p = mCamera.getParameters(); p.setPreviewSize(w, h);
mCamera.setParameters(p); try { mCamera.setPreviewDisplay(holder);
} catch (IOException e) { e.printStackTrace();
} mCamera.startPreview(); mPreviewRunning = true;
} @Override // When the camera is closed
public void surfaceDestroyed(SurfaceHolder holder) { mCamera.stopPreview();
mPreviewRunning = false; mCamera.release(); }
// When the picure is taken. This method gives the byte[] of the picture
Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] imageData, Camera c) {
} };

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Dec 27, 2009

How do I write code which layouts UI elements (Buttons, etc) over camera preview on Android ?

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Android :: How To Draw Overlay On Surface View Used By Camera?

May 29, 2010

I have a simple program that draws the preview of the Camera into a SurfaceView. What I'm trying to do is using the onPreviewFrame method, which is invoked each time a new frame is drawn into the SurfaceView, in order to execute the invalidate method which is supposed to invoke the onDraw method. In fact, the onDraw method is being invoked, but nothing there is being printed (I guess the camera preview is overwriting the text I'm trying to draw).

This is a simplify version of the SurfaceView subclass I have:

public class Superficie extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder; public Camera camera; Superficie(Context context) { super(context);
mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
} public void surfaceCreated(final SurfaceHolder holder) { camera =;
try { camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) { invalidar();
} } ); } catch (IOException e) {} } public void invalidar(){ invalidate(); }
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewSize(w, h);
camera.setParameters(parameters); camera.startPreview(); }
@Override public void draw(Canvas canvas) { super.draw(canvas);
// nothing gets drawn :( Paint p = new Paint(Color.RED);
canvas.drawText("PREVIEW", canvas.getWidth() / 2, canvas.getHeight() / 2, p);
} }

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Android :: Overlay Images Onto Camera Preview Surface View

Aug 23, 2010

I have a SurfaceView that is being used to draw custom animations and I would like to overlay them onto a live-feed from the phone's camera. Currently, the SurfaceView that contains the animations has a white- background, but if I were to overlay them onto the phone's camera feed, they would have to be transparent. The camera and animation drawing cannot be done on the same SurfaceView. Is it possible to make a SurfaceView transparent? What is the best course to pursue the use of multiple views? My end goal is to essentially overlay the contents of another SurfaceView onto the Camera SurfaceView.

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Mar 31, 2009

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Aug 23, 2010

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Android :: Implement The Compass Function To Application

Jun 5, 2009

How can I implement the Compass function having 2 geopoints (start and destination)?

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Android :: Not Accurate - Build Compass For My Application

May 4, 2010

I need to build compass for my application.

From reading the documentation it seems there are two reasonable ways of doing this:

Sensor.TYPE_ORIENTATION method: This is the easy way of doing it. The problem with this is it is not accurate. When I compare my reading with Snaptic Compass it is about 10-15 degress off which for my purposes is unacceptable.

Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD and getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() method: The documentation says this "is usually more accurate". The problem is regardless of the delay I register with listener the compass goes crazy even when the device is stationary on flat surface.

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Dec 6, 2009

My camera stopped working. When I click my camera application I get the message "The application camera (process has stopped unexpectedly. Please try again". It's just a blank screen?

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Nov 11, 2009

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Nov 27, 2009

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Jun 10, 2010

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Nov 8, 2009

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