Android startCamera gives me a null Intent and ... destroys my global variable?

Question

I have the following problem:

when I try to start my camera, I can take a picture, even save it on my SD card, but when I am going to find a way to display on my device, I get errors.

My global variables are 2 (I used 1, but 2 is better to make sure this is a weird error):

private File photofile; private Uri mMakePhotoUri; 

and this is my camera start function:

 @SuppressLint("SimpleDateFormat") public void farefoto(int num){ // For naming the picture SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss"); String n = sdf.format(new Date()); String fotoname = "Immagine-"+ n +".jpg"; //Going through files and folders File photostorage = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES); File photostorage2 = new File(photostorage, "Immagini"); System.out.println(photostorage+"\n"+photostorage2); photostorage2.mkdirs(); // My file (global) photofile = new File(photostorage2, fotoname); Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //intent to start camera // My URI (global) mMakePhotoUri = Uri.fromFile(photofile); new Bundle(); // I took this code from internet, but if I remove this line, it the same i.putExtra(MediaStore.EXTRA_OUTPUT, mMakePhotoUri); startActivityForResult(i, num); //num would be 1 on calling function } 

and my activity:

  @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub if (requestCode == 1){ try{ // tring my global URI photo = f.decodeAndResizeFile(new File(mMakePhotoUri.getPath())); } catch(NullPointerException ex){ System.out.println("fail"); ex.printStackTrace(); try{ // Trying my global FILE photo = BitmapFactory.decodeFile(photofile.getAbsolutePath()); } catch (Exception e){ e.printStackTrace(); Toast.makeText(this, "C'è stato un errore. Riprova a scattare la foto.", Toast.LENGTH_LONG).show(); } ...... ...... ....... } 

Always get a NullPointerException

But ... if I take the picture again, IT WORKS !! .

I read everything I could here ... but I have no logic when I change a global variable and I can not accept it again ...

Thanks in advance. Greetings.

---

Decision

As Alex Cohn said, my problem was that I called onCreate before onActivityResult due to possible out-of-memory (because sometimes it doesn’t do this), so I wanted the application to be “healthy” and I tried a few try / catch , and so I get the data, even if it calls onCreate or onActivityResult for the first call, and I wrote this data in the Binding, as described in the link to restore our state .

Thanks!.

Answer 1

Perhaps running ACTION_IMAGE_CAPTURE will cause your activity to ACTION_IMAGE_CAPTURE up. You should check (I’m just a log, the debugger can have its own side effects) that onCreate() your activity is called before onActivityResult() . If so, you should prepare your activity for reinitialization, perhaps using onSaveInstanceState(Bundle) .

Please note that the decision about whether to disable an action or save it in the background depends on the general state of the system, which is beyond your control. It will not surprise me if the decision, when you take the first shot, “turn it off!”, But when you take the picture again, it “keeps it in the background.”

Answer 2

It does not destroy variables. But after so many days of LOL research, I have a solution to my mistake. When I place the debugger, the method calls it, as after shooting.

• Oncreate ()
• onActivityResult ()
• onCeate ()
• onResume ()

Fix it by simply entering the following lines in the manifest. This is due to changes in the configuration of the camera and the soft entry mode in the window.

  <activity android:name="packageName.Activity" android:configChanges="orientation|keyboardHidden|screenSize" android:label="@string/app_name" android:screenOrientation="portrait" android:windowSoftInputMode="adjustResize" >