takepicture error in google glass app

Activity Forums Android mobile app takepicture error in google glass app

  • This topic is empty.
  • Creator
  • #124

    I have used camera.takepicture in below code but it did not work, please let me know the problem or your suggestions?

    public class CameraActivity extends Activity {

    private Camera mCamera;
    private CameraPreview mPreview;
    private Intent resultIntent;
    private PictureCallback mPicture;
    public static final int MEDIA_TYPE_IMAGE = 1;
    public static final int MEDIA_TYPE_VIDEO = 2;
    private static final String TAG = "CameraActivity";

    public void onCreate(Bundle savedInstanceState) {

    // Create an instance of Camera
    mCamera = getCameraInstance();

    // Make the callback
    mPicture = new PictureCallback() {

    private static final String TAG = "PictureCallback";

    public void onPictureTaken(byte[] data, Camera camera) {

    File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
    if (pictureFile == null){
    Log.d(TAG, "Error creating media file, check storage permissions: ");

    try {
    FileOutputStream fos = new FileOutputStream(pictureFile);
    } catch (FileNotFoundException e) {
    Log.d(TAG, "File not found: " + e.getMessage());
    } catch (IOException e) {
    Log.d(TAG, "Error accessing file: " + e.getMessage());
    Log.d(TAG, "Callback made and picture taken!");

    // Create our Preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, mCamera);
    FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    Log.d(TAG, "Preview made!");


    // have a delay so the camera can set up
    try {
    } catch (InterruptedException e) {

    mCamera.takePicture(null, null, mPicture);


    public void setIntent(Uri photoURI){
    resultIntent = new Intent();
    setResult(Activity.RESULT_OK, resultIntent);

    public static Camera getCameraInstance(){
    Camera c = null;
    try {
    c = Camera.open(); // attempt to get a Camera instance
    catch (Exception e){
    // Camera is not available (in use or does not exist)

    // Parameters needed for Google Glass
    Camera.Parameters params = c.getParameters();
    params.setPreviewFpsRange(30000, 30000);
    // hard-coding is bad, but I'm a bit lazy
    params.setPictureSize(640, 480);
    params.setPreviewSize(640, 480);

    return c; // returns null if camera is unavailable

    protected void onPause() {
    releaseCamera(); // release the camera immediately on pause event

    private void releaseCamera(){
    if (mCamera != null){
    mCamera.release(); // release the camera for other applications
    mCamera = null;

    /** Create a file Uri for saving an image or video */
    private static Uri getOutputMediaFileUri(int type){
    return Uri.fromFile(getOutputMediaFile(type));

    /** Create a File for saving an image or video */
    private static File getOutputMediaFile(int type){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
    Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
    if (! mediaStorageDir.mkdirs()){
    Log.d("MyCameraApp", "failed to create directory");
    return null;

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE){
    mediaFile = new File(mediaStorageDir.getPath() + File.separator +
    "IMG_"+ timeStamp + ".jpg");
    } else if(type == MEDIA_TYPE_VIDEO) {
    mediaFile = new File(mediaStorageDir.getPath() + File.separator +
    "VID_"+ timeStamp + ".mp4");
    } else {
    return null;

    return mediaFile;

    10-30 18:00:58.599 11361-11361/com.example.cerveau.recognizeplaces D/OpenGLRenderer﹕ Enabling debug mode 0
    10-30 18:00:58.833 11361-11361/com.example.cerveau.recognizeplaces D/CameraActivity﹕ Preview made!
    10-30 18:01:08.654 11361-11361/com.example.cerveau.recognizeplaces I/Choreographer﹕ Skipped 601 frames! The application may be doing too much work on its main thread.
    10-30 18:01:08.677 11361-11361/com.example.cerveau.recognizeplaces I/RecogPlaces﹕ Got to onActivity
    10-30 18:01:08.677 11361-11361/com.example.cerveau.recognizeplaces I/RecogPlaces﹕ Request code: 100, Result code: -1, what it wants: -1
    10-30 18:01:08.677 11361-11361/com.example.cerveau.recognizeplaces I/RecogPlaces﹕ Got inside the IF
    10-30 18:01:08.685 11361-11361/com.example.cerveau.recognizeplaces D/AndroidRuntime﹕ Shutting down VM
    10-30 18:01:08.685 11361-11361/com.example.cerveau.recognizeplaces W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41600bd8)
    10-30 18:01:08.685 11361-11361/com.example.cerveau.recognizeplaces E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.cerveau.recognizeplaces, PID: 11361
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100, result=-1, data=Intent { dat=file:///storage/emulated/0/Pictures/MyCameraApp/IMG_20141030_180059.jpg }} to activity java.lang.NullPointerException
    at android.app.ActivityThread.deliverResults(ActivityThread.java:3391)
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3434)
    at android.app.ActivityThread.access$1300(ActivityThread.java:138)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:149)
    at android.app.ActivityThread.main(ActivityThread.java:5045)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.NullPointerException
    at java.io.File.fixSlashes(File.java:185)
    at java.io.File.(File.java:134)

Viewing 1 replies (of 1 total)
  • Author
  • #136

    developers.google.com/glass/develop/gdk/camera I’ve used this to take pictures with the glass device.

Viewing 1 replies (of 1 total)
  • You must be logged in to reply to this topic.