文件在android中不存在？

Question

我有一個應用程序可以使用這樣的攝像頭捕捉圖像。

 String[] galleryPermissions = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}; 

    if (EasyPermissions.hasPermissions(this, galleryPermissions)){ 
    //Camera 
    if (index == 0) { 
     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) {    
      Toast.makeText(getApplicationContext(),ex.getMessage(),Toast.LENGTH_LONG).show(); 
      } 
      // Continue only if the File was successfully created 
      if (photoFile != null) { 

       Uri photoURI = null; 

       // N is for Nougat Api 24 Android 7 
       if (Build.VERSION_CODES.N <= android.os.Build.VERSION.SDK_INT) { 
        // FileProvider required for Android 7. Sending a file URI throws exception. 


        photoURI = FileProvider.getUriForFile(this, 
          BuildConfig.APPLICATION_ID + ".provider", 
          photoFile); 


        Log.v("highbuild",photoURI.toString()); 

       } else { 
        // For older devices: 
        // Samsung Galaxy Tab 7" 2 (Samsung GT-P3113 Android 4.2.2, API 17) 
        // Samsung S3 
        photoURI = Uri.fromFile(photoFile); 
        Log.v("lowbuild",photoURI.toString()); 
       } 
       imageuriduplicate = photoURI; 
       takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI); 
       startActivityForResult(takePictureIntent, 0); 
      } 
      else{ 
       Log.v("file", "photo file is null"); 
       Toast.makeText(getApplicationContext(),"Photo file is null", Toast.LENGTH_LONG).show(); 
      } 
     } 

    } 

    //Gallery 
    else if (index == 1) { 

     Intent pickPhoto = new Intent(Intent.ACTION_PICK, 
       MediaStore.Images.Media.INTERNAL_CONTENT_URI); 
     pickPhoto.setType("image/*"); 
     startActivityForResult(pickPhoto, 1);//one can be replaced with any action code 
    } 
} 

else { 
    EasyPermissions.requestPermissions(this, "Access for storage", 
      101, galleryPermissions); 
} 

我創建的文件圖像的方法是這樣的

private File createImageFile() throws IOException { 
    // Create an image file name 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
    String imageFileName = "AndroidUpload" + timeStamp + "_"; 
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES); 
    if(!storageDir.exists()){ 

     boolean s = new File(storageDir.getPath()).mkdirs(); 

     if(!s){ 
      Log.v("not", "not created"); 
     } 
     else{ 
      Log.v("cr","directory created"); 
     } 
    } 
    else{ 
     Log.v("directory", "directory exists"); 
    } 

    File image = File.createTempFile(
      imageFileName, /* prefix */ 
      ".png",   /* suffix */ 
      storageDir  /* directory */ 
    ); 

    // Save a file: path for use with ACTION_VIEW intents 
    mCurrentPhotoPath = image.getAbsolutePath(); 
    return image; 
} 

我那麼路徑後保存到一個ArrayList和訪問它。

但是當我嘗試訪問該文件這樣

   Uri imageuri = Uri.parse(receipts.get(i).imageURI); 
       File file = new File(imageuri.getPath()); 
      if(file.exists()){ 
       Log.v("exists","file exists"); 
      } 
      else{ 
       Log.v("no","file doesnt exist"); 
      } 

我得到犯規存在錯誤的文件。

我給了所有必要的權限，我仍然收到此錯誤。如何解決這個問題？

Answer 1

確保storageDir存在。如果不創建目錄使用

new File(path_to_dir).mkdirs();