Студия Android Не удается создать новый каталог на SD-карте?

Question

Я использую библиотеку под названием scanlibrary для сканирования фотографии, а затем передаю ее в tess-two для выполнения процесса OCR. Проблема заключается в том, что каталог «ScanDemoExample» не создается, таким образом, tessdata файлы не копируются, и когда я запускаю свою деятельность, я получаю ошибку:

E/Tesseract(native): Could not initialize Tesseract API with language=eng! 

потому что тессеракт не может найти файлы в data_path , код работает, когда я использую существующий каталог вместо следующего:

public static final String DATA_PATH = Environment 
     .getExternalStorageDirectory() +"/ScanDemoExample/"; 

Вот моя основная деятельность:

package com.scanner.demo; 

import android.app.Activity; 
import android.content.Intent; 
import android.content.res.AssetManager; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.support.v7.app.ActionBarActivity; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 

import com.googlecode.tesseract.android.TessBaseAPI; 
import com.scanlibrary.ScanActivity; 
import com.scanlibrary.ScanConstants; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 

public class MainActivity extends ActionBarActivity { 
    public static final String PACKAGE_NAME = "com.scanner.demo"; 
    public static final String DATA_PATH = Environment 
      .getExternalStorageDirectory() +"/ScanDemoExample/"; 

    // You should have the trained data file in assets folder 
    // You can get them at: 
    // http://code.google.com/p/tesseract-ocr/downloads/list 
    public static final String lang = "eng"; 

    private static final String TAG = "MainActivity.java"; 

    // public static final String _path = DATA_PATH + "/ocr.jpg"; 




    private static final int REQUEST_CODE = 99; 
    private Button scanButton; 
    private Button cameraButton; 
    private Button mediaButton; 
    private ImageView scannedImageView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     String[] paths = new String[] { DATA_PATH, DATA_PATH + "tessdata/" }; 

     for (String path : paths) { 
      File dir = new File(path); 
      if (!dir.exists()) { 
       if (!dir.mkdirs()) { 
        Log.e(TAG, "ERROR: Creation of directory " + path + " on sdcard failed"); 
        return; 
       } else { 
        Log.v(TAG, "Created directory " + path + " on sdcard"); 
       } 
      } 

     } 

     // lang.traineddata file with the app (in assets folder) 
     // You can get them at: 
     // http://code.google.com/p/tesseract-ocr/downloads/list 
     // This area needs work and optimization 
     if (!(new File(DATA_PATH + "tessdata/" + lang + ".traineddata")).exists()) { 
      try { 

       AssetManager assetManager = getAssets(); 
       InputStream in = assetManager.open("tessdata/" + lang + ".traineddata"); 
       //GZIPInputStream gin = new GZIPInputStream(in); 
       OutputStream out = new FileOutputStream(DATA_PATH 
         + "tessdata/" + lang + ".traineddata"); 

       // Transfer bytes from in to out 
       byte[] buf = new byte[1024]; 
       int len; 
       //while ((lenf = gin.read(buff)) > 0) { 
       while ((len = in.read(buf)) > 0) { 
        out.write(buf, 0, len); 
       } 
       in.close(); 
       //gin.close(); 
       out.close(); 

       Log.v(TAG, "Copied " + lang + " traineddata"); 
      } catch (IOException e) { 
       Log.e(TAG, "Was unable to copy " + lang + " traineddata " + e.toString()); 
      } 
     } 


     init(); 
    } 

    private void init() { 
     scanButton = (Button) findViewById(R.id.scanButton); 
     scanButton.setOnClickListener(new ScanButtonClickListener()); 
     cameraButton = (Button) findViewById(R.id.cameraButton); 
     cameraButton.setOnClickListener(new ScanButtonClickListener(ScanConstants.OPEN_CAMERA)); 
     mediaButton = (Button) findViewById(R.id.mediaButton); 
     mediaButton.setOnClickListener(new ScanButtonClickListener(ScanConstants.OPEN_MEDIA)); 
     scannedImageView = (ImageView) findViewById(R.id.scannedImage); 

    } 

    private class ScanButtonClickListener implements View.OnClickListener { 

     private int preference; 

     public ScanButtonClickListener(int preference) { 
      this.preference = preference; 
     } 

     public ScanButtonClickListener() { 
     } 

     @Override 
     public void onClick(View v) { 
      startScan(preference); 
     } 
    } 

    protected void startScan(int preference) { 

     Intent intent = new Intent(this, ScanActivity.class); 
     intent.putExtra(ScanConstants.OPEN_INTENT_PREFERENCE, preference); 

     startActivityForResult(intent, REQUEST_CODE); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) { 
      Uri uri = data.getExtras().getParcelable(ScanConstants.SCANNED_RESULT); 
      Bitmap bitmap = null; 
      try { 
       bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri); 
       getContentResolver().delete(uri, null, null); 
       scannedImageView.setImageBitmap(bitmap); 






       /////////////////////////////////////////////////////////// 
       Log.v(TAG, "Before baseApi"); 
       Log.v(TAG, "ExternalStorageDirectory: "+Environment 
         .getExternalStorageDirectory().toString()); 
       Log.v(TAG, "DATA_PATH: "+DATA_PATH); 

       TessBaseAPI baseApi = new TessBaseAPI(); 
       baseApi.setDebug(true); 
       baseApi.init(DATA_PATH, lang); 
       bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true); 

       baseApi.setImage(bitmap); 

       String recognizedText = baseApi.getUTF8Text(); 

       baseApi.end(); 

       // You now have the text in recognizedText var, you can do anything with it. 
       // We will display a stripped out trimmed alpha-numeric version of it (if lang is eng) 
       // so that garbage doesn't make it to the display. 

       Log.v(TAG, "OCRED TEXT: " + recognizedText); 

       if (lang.equalsIgnoreCase("eng")) { 
        recognizedText = recognizedText.replaceAll("[^a-zA-Z0-9]+", " "); 
       } 


      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    private Bitmap convertByteArrayToBitmap(byte[] data) { 
     return BitmapFactory.decodeByteArray(data, 0, data.length); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

Edit: вот мой LogCat

I/art: Explicit concurrent mark sweep GC freed 2044(210KB) AllocSpace objects, 6(395KB) LOS objects, 40% free, 3MB/6MB, paused 242us total 9.669ms 
V/MainActivity.java: Before baseApi 
V/MainActivity.java: ExternalStorageDirectory: /storage/emulated/0 
V/MainActivity.java: DATA_PATH: /storage/emulated/0/ScanDemoExample/ 
W/linker: libjpgt.so: unused DT entry: type 0x6ffffffe arg 0x2114 
W/linker: libjpgt.so: unused DT entry: type 0x6fffffff arg 0x1 
W/linker: libpngt.so: unused DT entry: type 0x6ffffffe arg 0x4a04 
W/linker: libpngt.so: unused DT entry: type 0x6fffffff arg 0x2 
W/linker: liblept.so: unused DT entry: type 0x6ffffffe arg 0x1dc90 
W/linker: liblept.so: unused DT entry: type 0x6fffffff arg 0x2 
W/linker: libtess.so: unused DT entry: type 0x6ffffffe arg 0x5d2e8 
W/linker: libtess.so: unused DT entry: type 0x6fffffff arg 0x3 
E/Tesseract(native): Could not initialize Tesseract API with language=eng! 
A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x8 in tid 2863 (om.scanner.demo) 
Application terminated. 

Answer 1

Вы пытались включить это разрешение?

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE); 

есть хороший пример: Storage permission error in Marshmallow