Now you are ready to fire the camera intent. The action you want is called ACTION_IMAGE_CAPTURE, and it is defined in the MediaStore class. MediaStore defines the public interfaces used in Android for interacting with common media – images, videos, and music. This includes the image capture intent, which fires up the camera.

By default, ACTION_IMAGE_CAPTURE will dutifully fire up the camera application and take a picture, but it will not be a full-resolution picture. Instead, it will take a small-resolution thumbnail picture and stick it inside the Intent object returned in onActivityResult(…).

For a full-resolution output, you need to tell it where to save the image on the filesystem. This can be done by passing a Uri pointing to where you want to save the file in MediaStore.EXTRA_OUTPUT. This Uri will point at a location serviced by FileProvider.

Write an implicit intent to ask for a new picture to be taken into the location saved in mPhotoFile. Add code to ensure that the button is disabled if there is no camera app or if there is no location at which to save the photo. (To determine whether there is a camera app available, you will query PackageManager for activities that respond to your camera implicit intent. Querying the PackageManager is discussed in more detail in the section called Checking for responding activities in Chapter 15.)

private static final int REQUEST_DATE = 0;
private static final int REQUEST_CONTACT = 1;
private static final int REQUEST_PHOTO= 2;
...
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    ...
    mPhotoButton = (ImageButton) v.findViewById(R.id.crime_camera);
    final Intent captureImage = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    boolean canTakePhoto = mPhotoFile != null &&
            captureImage.resolveActivity(packageManager) != null;
    mPhotoButton.setEnabled(canTakePhoto);

    mPhotoButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Uri uri = FileProvider.getUriForFile(getActivity(),
                    "com.bignerdranch.android.criminalintent.fileprovider",
                    mPhotoFile);
            captureImage.putExtra(MediaStore.EXTRA_OUTPUT, uri);

            List<ResolveInfo> cameraActivities = getActivity()
                    .getPackageManager().queryIntentActivities(captureImage,
                            PackageManager.MATCH_DEFAULT_ONLY);

            for (ResolveInfo activity : cameraActivities) {
                getActivity().grantUriPermission(activity.activityInfo.packageName,
                        uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            }

            startActivityForResult(captureImage, REQUEST_PHOTO);
        }
    });

    mPhotoView = (ImageView) v.findViewById(R.id.crime_photo);

    return v;
}

Calling FileProvider.getUriForFile(…) translates your local filepath into a Uri the camera app can see. To actually write to it, though, you need to grant the camera app permission. To do this, you grant the Intent.FLAG_GRANT_WRITE_URI_PERMISSION flag to every activity your cameraImage intent can resolve to. That grants them all a write permission specifically for this one Uri. Adding the android:grantUriPermissions attribute in your provider declaration was necessary to open this bit of functionality. Later, you will revoke this permission to close up that gap in your armor again.

Run CriminalIntent and press the camera button to run your camera app (Figure 16.4).

Figure 16.4  [Insert your camera app here]