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programming_tips_and_tricks [2017/05/13 19:51] – [양력/음력 날짜 계산] ledyxprogramming_tips_and_tricks [2021/02/07 03:15] (current) – external edit 127.0.0.1
Line 647: Line 647:
 === 합병 정렬(Merge Sort) === === 합병 정렬(Merge Sort) ===
 [[algorithm:Merge Sort | 합병 정렬(Merge Sort)]] [[algorithm:Merge Sort | 합병 정렬(Merge Sort)]]
- 
- 
-= Design Pattern = 
- 
-== Serialization을 이용한 Deep Copy == 
-<sxh java> 
-/* Java */ 
-@SuppressWarnings("unchecked") 
-public static <T> T deepCopy(T obj) { 
- try { 
- ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
- ObjectOutputStream oos = new ObjectOutputStream(baos); 
- oos.writeObject(obj); 
- 
- ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); 
- ObjectInputStream ois = new ObjectInputStream(bais); 
- return (T) ois.readObject(); 
- } catch (IOException e) { 
- return null; 
- } catch (ClassNotFoundException e) { 
- return null; 
- } 
-} 
-</sxh> 
-https://github.com/xeyez/CSharp-PrototypePattern 
- 
-<sxh csharp> 
-/* C# */ 
-public static T DeepCopy<T>(T obj) 
-{ 
-        using (var ms = new MemoryStream()) 
-        { 
-            var formatter = new BinaryFormatter(); 
-            formatter.Serialize(ms, obj); 
-            ms.Position = 0; 
- 
-            return (T)formatter.Deserialize(ms); 
-        } 
-} 
-</sxh> 
-https://github.com/xeyez/Java-PrototypePattern 
- 
- 
  
  
Line 913: Line 870:
 http://arsviator.tistory.com/169 http://arsviator.tistory.com/169
  
-=== Uri에서 실제 경로를 받아오는 Method === +=== Image 압축 및 실제 경로 얻기 === 
-  * SD Card에 저장된 그림 파일을 ImageView에 붙일 필요가 있을 때 사용.+
 <sxh java> <sxh java>
-private String getRealImagePath (Uri uri) {  +public class ImageUtil { 
- Cursor cursor = getContentResolver().query(uri, null, null, null, null); + 
- cursor.moveToFirst(); +    private static final int MAX_IMAGE_SIZE = 1280; 
- int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); +    private static final int MAX_IMAGE_LENGTH = 720 * 1280; 
- return cursor.getString(index);+ 
 +    /** 
 +     * Image Uri → Compressed byte array 
 +     * (반복문으로 인하여 별도의 Thread 필요) 
 +     * @param context 
 +     * @param uri 
 +     * @return 
 +     * @throws Exception 
 +     */ 
 +    public static byte[] getCompressedByteArray(Context context, Uri uri) throws Exception { 
 +        BitmapFactory.Options options = new BitmapFactory.Options(); 
 + 
 +        options.inSampleSize = calculateInSampleSize(options, 800, 800); 
 +        options.inJustDecodeBounds = false; 
 +        options.inPreferredConfig= Bitmap.Config.ARGB_8888; 
 + 
 +        BufferedInputStream bin = new BufferedInputStream(context.getContentResolver().openInputStream(uri)); 
 +        Bitmap bitmap = BitmapFactory.decodeStream(bin, null, options); 
 + 
 +        // resize (지정한 크기보다 작은 경우만) 
 +        if(bitmap.getWidth() * bitmap.getHeight() > MAX_IMAGE_SIZE * 2) 
 +            bitmap = resizeBitmap(bitmap, MAX_IMAGE_SIZE); 
 + 
 +        int compressQuality = 100; 
 +        int streamLength; 
 + 
 +        byte[] bitmapdata; 
 + 
 +        String realPath = getRealImagePath(context, uri); 
 +        String extension = realPath.substring(realPath.lastIndexOf('.') + 1); 
 +        Bitmap.CompressFormat format; 
 +        switch (extension.toLowerCase()) { 
 +            case "jpg" : 
 +            case "jpeg" : 
 +                format = Bitmap.CompressFormat.JPEG; 
 +                break; 
 + 
 +            case "png" : 
 +            case "gif" : 
 +                format = Bitmap.CompressFormat.PNG; 
 +                break; 
 + 
 +            case "webp" : 
 +                format = Bitmap.CompressFormat.WEBP; 
 +                break; 
 + 
 +            default: 
 +                throw new Exception("Unsupported format!"); 
 +        } 
 + 
 +        do { 
 +            ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
 +            bitmap.compress(format, compressQuality, baos); 
 +            bitmapdata = baos.toByteArray(); 
 +            streamLength = bitmapdata.length; 
 +            compressQuality -= 5; 
 +        } while (streamLength >= MAX_IMAGE_LENGTH); 
 + 
 +        Log.d("compressBitmap", "Quality: " + compressQuality); 
 +        Log.d("compressBitmap", "Size: " + streamLength/1024+" kb"); 
 + 
 +        return bitmapdata; 
 +    } 
 + 
 +    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { 
 +        final int height = options.outHeight; 
 +        final int width = options.outWidth; 
 +        int inSampleSize = 1; 
 + 
 +        if (height > reqHeight || width > reqWidth) { 
 + 
 +            final int halfHeight = height / 2; 
 +            final int halfWidth = width / 2; 
 + 
 +            // Calculate the largest inSampleSize value that is a power of 2 and keeps both 
 +            // height and width larger than the requested height and width. 
 +            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { 
 +                inSampleSize *= 2; 
 +            } 
 +        } 
 +        Log.d("inSampleSize", String.valueOf(inSampleSize)); 
 +        return inSampleSize; 
 +    } 
 + 
 +    private static Bitmap resizeBitmap(Bitmap bitmap, int maxSize) { 
 +        float ratio = Math.min((float) maxSize / bitmap.getWidth(), (float) maxSize / bitmap.getHeight()); 
 +        int width = Math.round(ratio * bitmap.getWidth()); 
 +        int height = Math.round(ratio * bitmap.getHeight()); 
 +        return Bitmap.createScaledBitmap(bitmap, width, height, false); 
 +    } 
 + 
 +    /** 
 +     * Uri를 이용해 실제 저장소 경로 얻기 
 +     * @param context 
 +     * @param uri 
 +     * @return 
 +     */ 
 +    public static String getRealImagePath(Context context, Uri uri) { 
 +        Cursor cursor = context.getContentResolver().query(uri, null, null, null, null); 
 +        cursor.moveToFirst(); 
 +        int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
 +        return cursor.getString(index); 
 +    } 
 + 
 +    /** 
 +     * [0] : fileName 
 +     * [1] : extension 
 +     * @param filePath 
 +     * @return 
 +     */ 
 +    public static String[] getFileNameAndExtension(String filePath) { 
 +        return new String[] {filePath.substring(filePath.lastIndexOf(File.pathSeparator) + 1), filePath.substring(filePath.lastIndexOf('.') + 1)}; 
 +    }
 } }
 +</sxh>
 +
 +
 += Intellij - Git Bash 연동 =
 +
 +Tools -> Terminal
 +
 +<sxh bash>
 +"C:\Program Files\Git\bin\sh.exe" -login -i
 </sxh> </sxh>
programming_tips_and_tricks.1494701487.txt.gz · Last modified: 2021/02/07 03:15 (external edit)