LibGDX：如何檢索通過相機拍攝並保存在本地的圖片？

Question

我的應用程序的功能：

1-用戶可以通過設備相機拍照。 （作品）

2-應用程序創建下列文件夾一個新的文件（以下文件夾測試，以確保其正確地保存文件）：

a. File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "images"); 
- File mediaFile = new File(mediaStorageDir.getPath()+File.separator+fileName + ".jpg"); 

b. File mediaStorageDir = new File(Gdx.files.getExternalStoragePath().toString()); 
- File mediaFile = new File(mediaStorageDir.getPath()+File.separator+fileName+".jpg"); 

c. File mediaStorageDir = new File(Gdx.files.getLocalStoragePath().toString()); 
- File mediaFile = new File(mediaStorageDir.getPath()+File.separator+fileName+".jpg"); 

3 - 應用程序resmples +壓縮圖片降至1024x512與bmp.compress（質量= 25），然後保存它。 （作品）

public boolean compressToFile(byte[] data, int quality, File fileHandle) { 
    File mediaFile = fileHandle; 
    Pixmap pixmap = new Pixmap(data, 0, data.length); 

    if(quality<0) 
     quality = 0; 
    if(quality>100) 
     quality = 100; 

    FileOutputStream fos; 
    int x=0,y=0; 
    int xl=0,yl=0; 
    try { 
     Bitmap bmp = Bitmap.createBitmap(pixmap.getWidth(), pixmap.getHeight(), Bitmap.Config.ARGB_8888); 
     // we need to switch between LibGDX RGBA format to Android ARGB format 
     for (x=0,xl=pixmap.getWidth(); x<xl;x++) { 
      for (y=0,yl=pixmap.getHeight(); y<yl;y++) { 
       int color = pixmap.getPixel(x, y); 
       // RGBA => ARGB 
       int RGB = color >> 8; 
       int A = (color & 0x000000ff) << 24; 
       int ARGB = A | RGB; 
       bmp.setPixel(x, y, ARGB); 
      } 
     } 

     fos = new FileOutputStream(mediaFile, false); 
     boolean compressed = bmp.compress(CompressFormat.JPEG, quality, fos); 
     if(compressed) 
      System.out.println("zgzg2020:: compressed SUCCESS!"); 
     else 
      System.out.println("zgzg2020:: compressed FAILED!"); 
     fos.close(); 

     int WIDTH = 1024, HEIGHT = 512; 
     File f = mediaFile; 
     Bitmap shrunkBmp = downsizeImage(f, WIDTH, HEIGHT); 
     fos = new FileOutputStream(mediaFile, false); 
     shrunkBmp.compress(CompressFormat.JPEG, 100, fos); 
     fos.close(); 

     return true; 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (IllegalArgumentException e) { 
     e.printStackTrace(); 
    } 

    return false; 
} 

比例縮小。

  public Bitmap downsizeImage(File file, int width, int height) { 
     BitmapFactory.Options opts = new BitmapFactory.Options(); 
     opts.inSampleSize = 2; // for 1/2 the image to be loaded 
     Bitmap thumb = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(file.getPath(), opts), width, height, false); 
     return thumb; 
    } 

4-確認jpg保存正確。我已經用上述三種路徑進行了測試。

System.out.println("b4 pictureFile= " + file.getPath().toString() + "=> " + file.exists());//Returns false. 
compressToFile(data, quality, file);//Here is where the compression, scale down, write to disk. 
System.out.println("af pictureFile= " + file.getPath().toString() + "=> " + file.exists());//Returns true 

5-讀取保存的圖片並將其顯示在屏幕上。 應用程序在這裏崩潰!!!

mode = Mode.render; 
System.out.println("AssessPath:"+file.toString());//to confirm the path 
texture = new Texture(file.toString());//(FAILS!!) 

錯誤

com.badlogic.gdx.utils.GdxRuntimeException: Couldn't load file 

注：

• 我測試過我的應用程序在兩臺機器上，棉花糖，棒棒糖。兩者都有相同的錯誤失敗。

• 權限似乎正確：

• 節省了機器上的文件後，我手動將文件複製到該文件夾​​中的資產。該應用程序能夠打開該文件;所以我確信該文件符合LibGDX分辨率...等要求。

• 我經歷了那麼多的文章和問題/答案搜索，找不到我的問題的原因：

• Save and retrieve an image file in LibGDX

• https://github.com/libgdx/libgdx/wiki/File-handling#writing-to-a-file

• https://github.com/libgdx/libgdx/wiki/Integrating-libgdx-and-the-device-camera

• com.badlogic.gdx.utils.GdxRuntimeException: Couldn't load file: - Error

• GdxRuntimeException: Couldn't load file

Answer 1

我與platform specific code這樣做。該接口用於核心代碼。

public interface GalleryOpener { 
    void openGallery();  
    String getSelectedImagePath(); 
} 

這是android上的實現。

public class AndroidLauncher extends AndroidApplication implements GalleryOpener { 

    public static final int SELECT_IMAGE_CODE = 1; 
    private String selectedImagePath; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     AndroidApplicationConfiguration config = new AndroidApplicationConfiguration(); 

     initialize(new GreenWall(this), config); 
    } 

    @Override 
    public GalleryOpener galleryOpener() { 
     return this; 
    } 

    @Override 
    public void openGallery() { 
     selectedImagePath = null; 

     Intent intent = new Intent(); 
     intent.setType("image/*"); 
     intent.setAction(Intent.ACTION_GET_CONTENT); 
     startActivityForResult(Intent.createChooser(intent, "Select Image"), SELECT_IMAGE_CODE); 
    } 

    @Override 
    public String getSelectedImagePath() { 
     return selectedImagePath; 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (resultCode == RESULT_OK && requestCode == SELECT_IMAGE_CODE) { 
      Uri imageUri = data.getData(); 
      selectedImagePath = getPath(imageUri); 
     } 
     //super.onActivityResult(requestCode, resultCode, data); 
    } 

    private String getPath(Uri uri) { 
     if (uri.getScheme().equalsIgnoreCase("file")) { 
      return uri.getPath(); 
     } 

     Cursor cursor = getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null); 
     if (cursor == null) { 
      return null; 
     } 

     int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
     cursor.moveToFirst(); 

     String filePath = cursor.getString(column_index); 
     cursor.close(); 

     return filePath; 
    } 
} 

使用這可以看起來像：

galleryOpener.openGallery(); 
String selectedImagePath = galleryOpener.getSelectedImagePath(); 
if (selectedImagePath != null) { 
    FileHandle fileHandle = Gdx.files.absolute(selectedImagePath); 
    Texture texture = new Texture(fileHandle); 
}