下面是我的代码，我可以用捕获的图像完美地提取文本，但是我无法使用从移动图库中选择的图像来提取文本。就像我通过该应用程序单击图片一样，我可以提取文本，但是如果我从图库中选择图片，则不能。对于选定的图像，我能够获取图像的路径，但是随后，我不知道为什么tesseract方法不起作用。请帮我解决这个问题。
public class HomeActivity extends AppCompatActivity {
public static final String TESS_DATA = "/tessdata";
private static final String TAG = MainActivity.class.getSimpleName();
private static final String DATA_PATH = Environment.getExternalStorageDirectory().toString() + "/Tess";
private TextView textView;
private TessBaseAPI tessBaseAPI;
private Uri outputFileDir;
private String mCurrentPhotoPath;
private static final int PICK_IMAGE= 100;
Button btnSpeak;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
textView = (TextView) this.findViewById(R.id.textView);
btnSpeak=(Button)this.findViewById(R.id.btnSpeak);
final Activity activity = this;
checkPermission();
this.findViewById(R.id.btnCamera).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkPermission();
dispatchTakePictureIntent();
}
});
this.findViewById(R.id.btnUpload).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
openGallery();
}
});
}
private void checkPermission() {
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 120);
}
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 121);
}
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} 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,
BuildConfig.APPLICATION_ID + ".provider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, 1024);
}
}
}
public void openGallery(){
Intent gallery=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery,PICK_IMAGE);
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1024) {
if (resultCode == Activity.RESULT_OK) {
prepareTessData();
startOCR(outputFileDir);
} else if (resultCode == Activity.RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Result canceled.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Activity result failed.", Toast.LENGTH_SHORT).show();
}
}
else if( requestCode==Activity.RESULT_OK &&requestCode==PICK_IMAGE )
{
Uri ImageUri = data.getData();
mCurrentPhotoPath = getRealPathFromURI(ImageUri);
Toast.makeText(getApplicationContext(), mCurrentPhotoPath, Toast.LENGTH_LONG).show();
prepareTessData();
startOCR(outputFileDir);
if (resultCode == Activity.RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Result canceled.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Activity result failed.", Toast.LENGTH_SHORT).show();
}
}
}
public String getRealPathFromURI(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
private void prepareTessData(){
try{
File dir = getExternalFilesDir(TESS_DATA);
if(!dir.exists()){
if (!dir.mkdir()) {
Toast.makeText(getApplicationContext(), "The folder " + dir.getPath() + "was not created", Toast.LENGTH_SHORT).show();
}
}
String fileList[] = getAssets().list("");
for(String fileName : fileList){
String pathToDataFile = dir + "/" + fileName;
if(!(new File(pathToDataFile)).exists()){
InputStream in = getAssets().open(fileName);
OutputStream out = new FileOutputStream(pathToDataFile);
byte [] buff = new byte[1024];
int len ;
while(( len = in.read(buff)) > 0){
out.write(buff,0,len);
}
in.close();
out.close();
}
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
private void startOCR(Uri imageUri){
try{
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = false;
options.inSampleSize = 10;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, options);
String result = this.getText(bitmap);
textView.setText(result);
}catch (Exception e){
Log.e(TAG, e.getMessage());
}
}
private String getText(Bitmap bitmap){
try{
tessBaseAPI = new TessBaseAPI();
}catch (Exception e){
Log.e(TAG, e.getMessage());
}
String dataPath = getExternalFilesDir("/").getPath() + "/";
tessBaseAPI.init(dataPath, "eng");
tessBaseAPI.setImage(bitmap);
String retStr = "No result";
try{
retStr = tessBaseAPI.getUTF8Text();
}catch (Exception e){
Log.e(TAG, e.getMessage());
}
tessBaseAPI.end();
return retStr;
}
}