问候，我正在android studio中进行OCR工作，但是我需要，例如，如果我为一张发票拍照，则只能检测到文档ID（序列号）中特定的单词。
当前，该应用程序允许您抛出照片或搜索图库，然后剪切文档的一部分并将其粘贴到EditText中。
代码：
public class MainActivity extends AppCompatActivity {
EditText mResultEt;
ImageView mPreviewIv;
private static final int CAMERA_REQUEST_CODE = 1000;
private static final int STORAGE_REQUEST_CODE = 1400;
private static final int IMAGE_PICK_GALLERY_CODE = 2000;
private static final int IMAGE_PICK_CAMERA_CODE = 2001;
String cameraPermission[];
String storagePermission[];
Uri image_uri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.setSubtitle("Click + button to inter Image");
mResultEt = findViewById(R.id.resultEt);
mPreviewIv = findViewById(R.id.imageIv);
//camera permission
cameraPermission = new String[] {Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
//storage permission
storagePermission = new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE};
}
//Actionbar menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//inflate menu
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
//handle actionbar item clicks
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.addImage){
showImageImportDialog();
}
/*if (id == R.id.settings){
Toast.makeText(this, "Settings", Toast.LENGTH_SHORT).show();
}*/
return super.onOptionsItemSelected(item);
}
private void showImageImportDialog() {
//items to display in dialog
String[] items = {"Camera", "Gallery"};
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
//set title
dialog.setTitle("Select Image");
dialog.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (which == 0){
//camera option clicked
if (!checkCameraPermission()){
//camera permission not allowed, request it
requestCameraPermission();
}
else{
//permission allowed, take picture
pickCamera();
}
}
if (which == 1){
//gallery option clicked
if(!checkStoragePermission()){
//Storage permission not allowed, request it
requestStoragePermission();
}
else{
//permission allowed, take picture
pickGallery();
}
}
}
});
dialog.create().show();// show dialog
}
private void pickGallery() {
//intent to pick image from gallery
Intent intent = new Intent(Intent.ACTION_PICK);
//set intent type to image
intent.setType("image/*");
startActivityForResult(intent, IMAGE_PICK_GALLERY_CODE);
}
private void pickCamera() {
//intent to take image from camera, it will also be save to storage to get high quality image
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "NewPic"); //tittle of the picture
values.put(MediaStore.Images.Media.DESCRIPTION, "Image To text"); // description
image_uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, image_uri);
startActivityForResult(cameraIntent, IMAGE_PICK_CAMERA_CODE);
}
private void requestStoragePermission() {
ActivityCompat.requestPermissions(this, storagePermission, STORAGE_REQUEST_CODE);
}
private boolean checkStoragePermission() {
boolean result = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == (PackageManager.PERMISSION_GRANTED);
return result;
}
private void requestCameraPermission() {
ActivityCompat.requestPermissions(this, cameraPermission, CAMERA_REQUEST_CODE);
}
private boolean checkCameraPermission() {
//Check camera permission and return the result in order to get high quality image we have to save image to external storage first
// before inserting to image view that's why storage permission will also be required
boolean result = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == (PackageManager.PERMISSION_GRANTED);
Boolean result1 = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == (PackageManager.PERMISSION_GRANTED);
return result && result1;
}
//handle permission result
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case CAMERA_REQUEST_CODE:
if(grantResults.length >0){
boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean writeStorageAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
if(cameraAccepted && writeStorageAccepted){
pickCamera();
}
else{
Toast.makeText(this, "permission denied", Toast.LENGTH_SHORT).show();
}
}
break;
case STORAGE_REQUEST_CODE:
if(grantResults.length >0){
boolean writeStorageAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
if(writeStorageAccepted){
pickGallery();
}
else{
Toast.makeText(this, "permission denied", Toast.LENGTH_SHORT).show();
}
}
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (resultCode == RESULT_OK){
if (requestCode == IMAGE_PICK_GALLERY_CODE){
//got image from gallery now crop it
CropImage.activity(data.getData()).setGuidelines(CropImageView.Guidelines.ON).start(this);
}
if (requestCode == IMAGE_PICK_CAMERA_CODE){
// got image from camera now crop it
CropImage.activity(image_uri)
.setGuidelines(CropImageView.Guidelines.ON)// enable image guidlines
.start(this);
}
}
//get cropped image
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE){
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if (resultCode == RESULT_OK){
Uri resultUri = result.getUri(); //get image uri
//set image to image view
mPreviewIv.setImageURI(resultUri);
//get drawable bitmap for text recognition
BitmapDrawable bitmapDrawable = (BitmapDrawable)mPreviewIv.getDrawable();
Bitmap bitmap = bitmapDrawable.getBitmap();
TextRecognizer recognizer = new TextRecognizer.Builder(getApplicationContext()).build();
if (!recognizer.isOperational()){
Toast.makeText(this, "Error", Toast.LENGTH_SHORT).show();
}
else{
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
SparseArray<TextBlock> items = recognizer.detect(frame);
StringBuilder sb = new StringBuilder();
//get text from sb until there is no text
for (int i = 0; i < items.size(); i++){
TextBlock myItem = items.valueAt(i);
sb.append(myItem.getValue());
sb.append("\n\n");
}
//set text to edit text
mResultEt.setText(sb.toString());
}
}
}
}
}