//varibles necesarias para manejo de fotos
File xphotofile;
String name;
Bitmap bitmap;

************************************

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="com.example.PROYECTONAME.provider"_{(digitamos provider)}
    android:exported="false"
    android:grantUriPermissions="true">
<meta-data
    android:name="android.support.FILE_PROVIDER_PATHS"_{(digitamos FILE_PROVIDER_PATHS)}
    android:resource="@xml/file_paths">
</meta-data>
</provider>

****************************************************

<paths xmlns:android="http://schemas.android.com/apk/res/android" >

<external-path
    name="my_images"
    path="Android/data/com.example.camaraaccion/files/Pictures" />
</paths>

*******************************************************

if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)

 

{

      ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.CAMERA}, 1000);

}

*****************************************************

//metodo tomar foto

static final int REQUEST_TAKE_PHOTO = 1;
public void tomarFoto(View view)
{
    //Levanta la camara
    Toast.makeText(MainActivity.this,"Levantando la camara", Toast.LENGTH_SHORT).show();
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   
  

    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
           photoFile = createImageFile();
            Toast.makeText(MainActivity.this,"Creando Archivo", Toast.LENGTH_SHORT).show();
        } catch (IOException ex) {
            // Error occurred while creating the File
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this, "com.example.PROYECTONAME.provider", photoFile);
            xphotofile= photoFile;
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }

    }
}

**************************************************

//metodo crear archivo
    String currentPhotoPath;
    private File createImageFile() throws IOException
    {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "Backup_" + timeStamp + "_";
        File storageDir1 = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(imageFileName,  ".jpg",storageDir1);

        // Save a file: path for use with ACTION_VIEW intents
        currentPhotoPath = image.getAbsolutePath();
        name=currentPhotoPath;

        return image;

    }

*********************************************

//vista previa en el Imview
static final int REQUEST_IMAGE_CAPTURE =1;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {

        //Trasnforma la foto xphotofile a bitmap y muestra en el view
        Bitmap bitmap = BitmapFactory.decodeFile(xphotofile.getAbsolutePath());
        fotopreview.setImageBitmap(bitmap);

        // guardarFotoGallery();
        btncamara.setEnabled(false);

    }
    else {
        Toast.makeText(MainActivity.this,"Cancelo el guardado de la foto", Toast.LENGTH_SHORT).show();
    }
}