Мои изображения не показывались с sdcard

Question

Я хочу попробовать пример хранения изображений на SD-карте и показать, работает ли он. Однако мои изображения не отображаются. Пожалуйста, помогите мне проверить мою проблему.

public class SDCard_Image { 

//read drawable files 
Resources res = getResources(); 
Drawable drawable = res.getDrawable(R.drawable.mood_1); 

//insert into sd card(?) 
public static boolean StoreByteImage(Context mContext, byte[] imageData, 
      int quality, String expName) { 

     File sdImageMainDirectory = new File("/sdcard/myImages"); 

     FileOutputStream fileOutputStream = null;  
     FileOutputStream fileOutputStream2 = null; 
     FileOutputStream fileOutputStream3 = null; 
     FileOutputStream fileOutputStream4 = null; 
     FileOutputStream fileOutputStream5 = null; 
     FileOutputStream fileOutputStream6 = null; 
     FileOutputStream fileOutputStream7 = null; 
     FileOutputStream fileOutputStream8 = null; 
     FileOutputStream fileOutputStream9 = null; 
     FileOutputStream fileOutputStream10 = null; 
     FileOutputStream fileOutputStream11 = null; 
     FileOutputStream fileOutputStream12 = null; 
     FileOutputStream fileOutputStream13 = null; 
     FileOutputStream fileOutputStream14 = null; 
     FileOutputStream fileOutputStream15 = null; 
     FileOutputStream fileOutputStream16 = null; 

     String mood_1 = null; 
     String mood_2 = null; 
     String mood_3 = null; 
     String mood_4 = null; 
     String mood_5 = null; 
     String mood_6 = null; 
     String mood_7 = null; 
     String mood_8 = null; 
     String mood_9 = null; 
     String mood_10 = null; 
     String mood_11 = null; 
     String mood_12 = null; 
     String mood_13 = null; 
     String mood_14 = null; 
     String mood_15 = null; 
     String mood_16 = null; 

     try { 

      BitmapFactory.Options options=new BitmapFactory.Options(); 
      options.inSampleSize = 5; 

      Bitmap myImage = BitmapFactory.decodeByteArray(imageData, 0, 
        imageData.length,options); 

      fileOutputStream = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_1 + ".jpg"); 
      fileOutputStream2 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_2 + ".jpg"); 
      fileOutputStream3 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_3 + ".jpg"); 
      fileOutputStream4 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_4 + ".jpg"); 
      fileOutputStream5 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_5 + ".jpg"); 
      fileOutputStream6 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_6 + ".jpg"); 
      fileOutputStream7 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_7 + ".jpg"); 
      fileOutputStream8 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_8 + ".jpg"); 
      fileOutputStream9 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_9 + ".jpg"); 
      fileOutputStream10 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_10 + ".jpg"); 
      fileOutputStream11 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_11 + ".jpg"); 
      fileOutputStream12 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_12 + ".jpg"); 
      fileOutputStream13 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_13 + ".jpg"); 
      fileOutputStream14 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_14 + ".jpg"); 
      fileOutputStream15 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_15 + ".jpg"); 
      fileOutputStream16 = new FileOutputStream(
        sdImageMainDirectory.toString() +"/" + mood_16 + ".jpg"); 

      BufferedOutputStream bos = new BufferedOutputStream(
        fileOutputStream); 

      myImage.compress(CompressFormat.JPEG, quality, bos); 

      bos.flush(); 
      bos.close(); 

     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     return true; 
    } 


private Resources getResources() { 
    // TODO Auto-generated method stub 
    return null; 
} 

}

И это часть чего я хочу показать мои изображения:

public class SDCardImagesActivity extends Activity { 

private Cursor cursor; 
private int columnIndex; 
private DBAdapter db; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mood); 
    db = new DBAdapter(this); 
    db.open(); 

    // Set up an array of the Thumbnail Image ID column we want 
    String[] projection = {MediaStore.Images.Thumbnails._ID}; 
    // Create the cursor pointing to the SDCard 
    cursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, 
      projection, // Which columns to return 
      null,  // Return all rows 
      null, 
      MediaStore.Images.Thumbnails.IMAGE_ID); 

    columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID); 

    GridView sdcardImages = (GridView) findViewById(R.id.gridview); 
    sdcardImages.setAdapter(new ImageAdapter(this)); 

    // Set up a click listener 
    sdcardImages.setOnItemClickListener(new OnItemClickListener() { 
     public void onItemClick(AdapterView parent, View v, int position, long id) { 
      // Get the data location of the image 
      String[] projection = {MediaStore.Images.Media.DATA}; 
      cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
        projection, // Which columns to return 
        null,  // Return all rows 
        null, 
        null); 
      columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
      cursor.moveToPosition(position); 
      // Get image filename 
      String imagePath = cursor.getString(columnIndex); 
      // Use this path to do further processing, i.e. full screen display 
     } 
    }); 
} 

private class ImageAdapter extends BaseAdapter { 

    private Context context; 

    public ImageAdapter(Context localContext) { 
     context = localContext; 
    } 

    public int getCount() { 
     return cursor.getCount(); 
    } 
    public Object getItem(int position) { 
     return position; 
    } 
    public long getItemId(int position) { 
     return position; 
    } 
    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView picturesView; 
     if (convertView == null) { 
      picturesView = new ImageView(context); 
      // Move cursor to current position 
      cursor.moveToPosition(position); 
      // Get the current value for the requested column 
      int imageID = cursor.getInt(columnIndex); 
      // Set the content of the image based on the provided URI 
      picturesView.setImageURI(Uri.withAppendedPath(
        MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID)); 
      picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER); 
      picturesView.setPadding(8, 8, 8, 8); 
      picturesView.setLayoutParams(new GridView.LayoutParams(100, 100)); 
     } 
     else { 
      picturesView = (ImageView)convertView; 
     } 
     return picturesView; 
    } 
} 

}

К сожалению код очень долго, но спасибо!

Answer 1

Чтобы заставить сканирование всего использования SDCARD sendBroadcast (новый Intent (Intent.ACTION_MEDIA_MOUNTED, Uri.parse ("файл: //" + Environment.getExternalStorageDirectory())));

или сканировать только конкретной папки используйте sendBroadcast (новый Intent (Intent.ACTION_MEDIA_MOUNTED, Uri.parse ("Файл: // FolderName" + Environment.getExternalStorageDirectory())));

Answer 2

У Ive была аналогичная проблема. Чтобы обойти это, мне пришлось вручную создать папку сначала в эмуляторе, в командной строке оболочки adb, а затем иметь возможность использовать путь к файлу в коде. Это сработало для меня. Действительно ли папка существует в этом месте на вашем эмуляторе? Если нет, вы должны сначала создать его вручную.