L'application Appareil photo enregistre les fichiers vides sur le bouton Précédent.

Question

J'utilise une application de caméra dans mon fragment. Tout fonctionne bien et les photos prises sont enregistrées comme et où je le souhaite.

Le problème est que lorsque je suis dans l'application photo et appuyez sur le bouton de retour sur l'appareil, une image vide est enregistrée. Comment puis-je éviter cela?

Voici mon CameraActivity:

public class CameraActivity extends Activity { 
    private static final String TAG = "CameraActivity"; 
    String currentFilePath; 
    String currentFileName; 

    @Override 
    protected void onCreate(@Nullable Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     new CameraTask().execute(); 
    } 

    public void dispatchPictureIntent() { 
     Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     if (takePictureIntent.resolveActivity(getPackageManager()) != null) { 

      File photoFile = null; 
      try { 
       photoFile = createImageFile(); 
      } catch (IOException e) { 
       Toast.makeText(this, R.string.msg_picture_not_saved, Toast.LENGTH_LONG).show(); 
      } 
      if (photoFile != null) { 
       Uri photoUri = FileProvider.getUriForFile(this, getClass().getCanonicalName(), photoFile); 
       takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri); 
       startActivityForResult(takePictureIntent, Constants.REQUEST_TO_TAKE_PICTURE); 

       addPictureToGallery(); 
       dispatchDataIntent(); 
      } 
     } 
    } 

    public File createImageFile() throws IOException { 
     File pathOfStorageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Camera"); 
     pathOfStorageDir.mkdir(); 

     String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
     String filePrefix = "img_" + timeStamp + "_"; 
     String suffix = ".jpg"; 

     File image = File.createTempFile(filePrefix, suffix, pathOfStorageDir); 
     currentFileName = image.getName(); 
     currentFilePath = image.getAbsolutePath(); 
     return image; 
    } 

    private void addPictureToGallery() { 
     Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
     File f = new File(currentFilePath); 
     Uri contentUri = Uri.fromFile(f); 
     mediaScanIntent.setData(contentUri); 
     this.sendBroadcast(mediaScanIntent); 
    } 

    private void dispatchDataIntent() { 
     Intent data = new Intent(); 
     data.putExtra(Constants.IMAGE_FILE_NAME, currentFileName); 
     setResult(CameraActivity.RESULT_OK, data); 
    } 

    private class CameraTask extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected Void doInBackground(Void... params) { 
      dispatchPictureIntent(); 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void aVoid) { 
      super.onPostExecute(aVoid); 
      finish(); 
     } 
    } 
} 

Merci pour l'aide!

Answer 1

Votre code enregistre toujours un fichier image. essayez de supprimer l'image enregistrée si l'utilisateur appuie sur le bouton de retour. Le meilleur moyen est de sauvegarder l'image dans onActivityResult, après avoir vérifié le code du résultat.

public class CameraActivity extends Activity { 
    private static final String TAG = "CameraActivity"; 
    String currentFilePath; 
    String currentFileName; 

    @Override 
    protected void onCreate(@Nullable Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     new CameraTask().execute(); 
    } 

    public void dispatchPictureIntent() { 
     Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     if (takePictureIntent.resolveActivity(getPackageManager()) != null) { 

      File photoFile = null; 
      try { 
       photoFile = createImageFile(); 
      } catch (IOException e) { 
       Toast.makeText(this, R.string.msg_picture_not_saved, Toast.LENGTH_LONG).show(); 
      } 
      if (photoFile != null) { 
       Uri photoUri = FileProvider.getUriForFile(this, getClass().getCanonicalName(), photoFile); 
       takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri); 
       startActivityForResult(takePictureIntent, Constants.REQUEST_TO_TAKE_PICTURE); 

      } 
     } 
    } 

    public File createImageFile() throws IOException { 
     File pathOfStorageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Camera"); 
     pathOfStorageDir.mkdir(); 

     String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
     String filePrefix = "img_" + timeStamp + "_"; 
     String suffix = ".jpg"; 

     File image = File.createTempFile(filePrefix, suffix, pathOfStorageDir); 
     currentFileName = image.getName(); 
     currentFilePath = image.getAbsolutePath(); 
     return image; 
    } 

    private void addPictureToGallery() { 
     Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
     File f = new File(currentFilePath); 
     Uri contentUri = Uri.fromFile(f); 
     mediaScanIntent.setData(contentUri); 
     this.sendBroadcast(mediaScanIntent); 
    } 

    private void dispatchDataIntent() { 
     Intent data = new Intent(); 
     data.putExtra(Constants.IMAGE_FILE_NAME, currentFileName); 
     setResult(CameraActivity.RESULT_OK, data); 
    } 

    private class CameraTask extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected Void doInBackground(Void... params) { 
      dispatchPictureIntent(); 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void aVoid) { 
      super.onPostExecute(aVoid); 
     } 
    } 

    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == Constants.REQUEST_TO_TAKE_PICTURE){ 
      if(resultCode == RESULT_OK) { 

       addPictureToGallery(); 
       dispatchDataIntent(); 
      } else { 
       File f = new File(currentFilePath); 
       f.delete(); 
      } 
     } 
      finish(); 

    }