एंड्रॉइड

Question

में छवि संपीड़ित करें मैं एक ऐसा एप्लिकेशन बना रहा हूं जो कैमरे से छवि लेता है और फिर उसे ईमेल करता है।

मित्रों के बाद से आप जानते हैं कि कैमरे की छवियां बहुत अधिक संकल्प और आकार में भी हो सकती हैं। 2.0 एमबी और अधिक तो मैं चाहता हूं कि छवि आकार के साथ-साथ संकल्प में फिर से आकार दें ताकि मैं उस फ़ाइल को ईमेल से जोड़ सकूं।

तो क्या कोई मेरी समस्या को प्राप्त करने के लिए मुझे कुछ कोड नमूना या कुछ दिशानिर्देश दे सकता है।

अग्रिम

Answer 1

.. आप इस बिटमैप संपीड़ित करने के लिए क्या कर सकते हैं

mBitmap = Bitmap.createScaledBitmap(mBitmap, 160, 160, true); 

Answer 2

धन्यवाद इस उदाहरण

public class bitmaptest extends Activity { 
@Override 
public void onCreate(Bundle icicle) { 
    super.onCreate(icicle); 
    LinearLayout linLayout = new LinearLayout(this); 

    // load the origial BitMap (500 x 500 px) 
    Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(), 
      R.drawable.android); 

    int width = bitmapOrg.width(); 
    int height = bitmapOrg.height(); 
    int newWidth = 200; 
    int newHeight = 200; 

    // calculate the scale - in this case = 0.4f 
    float scaleWidth = ((float) newWidth)/width; 
    float scaleHeight = ((float) newHeight)/height; 

    // createa matrix for the manipulation 
    Matrix matrix = new Matrix(); 
    // resize the bit map 
    matrix.postScale(scaleWidth, scaleHeight); 
    // rotate the Bitmap 
    matrix.postRotate(45); 

    // recreate the new Bitmap 
    Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, 
         width, height, matrix, true); 

    // make a Drawable from Bitmap to allow to set the BitMap 
    // to the ImageView, ImageButton or what ever 
    BitmapDrawable bmd = new BitmapDrawable(resizedBitmap); 

    ImageView imageView = new ImageView(this); 

    // set the Drawable on the ImageView 
    imageView.setImageDrawable(bmd); 

    // center the Image 
    imageView.setScaleType(ScaleType.CENTER); 

    // add ImageView to the Layout 
    linLayout.addView(imageView, 
     new LinearLayout.LayoutParams(
        LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT 
      ) 
    ); 

    // set LinearLayout as ContentView 
    setContentView(linLayout); 
} 
} 

कोशिश आप करने के लिए यह भी

Bitmap.createScaledBitmap(yourimage, 160, 160, true); 

Answer 3

कोशिश कर सकते हैं छवि का आकार बदलें फोल के साथ प्रयास करें कम कोड

public static Bitmap resizeBitMapImage1(String filePath, int targetWidth, 
      int targetHeight) { 
     Bitmap bitMapImage = null; 
     // First, get the dimensions of the image 
     Options options = new Options(); 
     options.inJustDecodeBounds = true; 
     BitmapFactory.decodeFile(filePath, options); 
     double sampleSize = 0; 
     // Only scale if we need to 
     // (16384 buffer for img processing) 
     Boolean scaleByHeight = Math.abs(options.outHeight - targetHeight) >= Math 
       .abs(options.outWidth - targetWidth); 

     if (options.outHeight * options.outWidth * 2 >= 1638) { 
      // Load, scaling to smallest power of 2 that'll get it <= desired 
      // dimensions 
      sampleSize = scaleByHeight ? options.outHeight/targetHeight 
        : options.outWidth/targetWidth; 
      sampleSize = (int) Math.pow(2d, 
        Math.floor(Math.log(sampleSize)/Math.log(2d))); 
     } 

     // Do the actual decoding 
     options.inJustDecodeBounds = false; 
     options.inTempStorage = new byte[128]; 
     while (true) { 
      try { 
       options.inSampleSize = (int) sampleSize; 
       bitMapImage = BitmapFactory.decodeFile(filePath, options); 

       break; 
      } catch (Exception ex) { 
       try { 
        sampleSize = sampleSize * 2; 
       } catch (Exception ex1) { 

       } 
      } 
     } 

     return bitMapImage; 
    } 

Answer 4

इसे आजमाएं। मुझे लगता है कि यह अब तक का सबसे अच्छा अनुकूल छवि संपीड़न उदाहरण है।

public String compressImage(String imageUri) { 
    String filePath = getRealPathFromURI(imageUri); 
     Bitmap scaledBitmap = null; 

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

//  by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If 
//  you try the use the bitmap here, you will get null. 
     options.inJustDecodeBounds = true; 
     Bitmap bmp = BitmapFactory.decodeFile(filePath, options); 

     int actualHeight = options.outHeight; 
     int actualWidth = options.outWidth; 

//  max Height and width values of the compressed image is taken as 816x612 

     float maxHeight = 816.0f; 
     float maxWidth = 612.0f; 
     float imgRatio = actualWidth/actualHeight; 
     float maxRatio = maxWidth/maxHeight; 

//  width and height values are set maintaining the aspect ratio of the image 

     if (actualHeight > maxHeight || actualWidth > maxWidth) { 
      if (imgRatio < maxRatio) {    imgRatio = maxHeight/actualHeight;    actualWidth = (int) (imgRatio * actualWidth);    actualHeight = (int) maxHeight;    } else if (imgRatio > maxRatio) { 
       imgRatio = maxWidth/actualWidth; 
       actualHeight = (int) (imgRatio * actualHeight); 
       actualWidth = (int) maxWidth; 
      } else { 
       actualHeight = (int) maxHeight; 
       actualWidth = (int) maxWidth; 

      } 
     } 

//  setting inSampleSize value allows to load a scaled down version of the original image 

     options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight); 

//  inJustDecodeBounds set to false to load the actual bitmap 
     options.inJustDecodeBounds = false; 

//  this options allow android to claim the bitmap memory if it runs low on memory 
     options.inPurgeable = true; 
     options.inInputShareable = true; 
     options.inTempStorage = new byte[16 * 1024]; 

     try { 
//   load the bitmap from its path 
      bmp = BitmapFactory.decodeFile(filePath, options); 
     } catch (OutOfMemoryError exception) { 
      exception.printStackTrace(); 

     } 
     try { 
      scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888); 
     } catch (OutOfMemoryError exception) { 
      exception.printStackTrace(); 
     } 

     float ratioX = actualWidth/(float) options.outWidth; 
     float ratioY = actualHeight/(float) options.outHeight; 
     float middleX = actualWidth/2.0f; 
     float middleY = actualHeight/2.0f; 

     Matrix scaleMatrix = new Matrix(); 
     scaleMatrix.setScale(ratioX, ratioY, middleX, middleY); 

     Canvas canvas = new Canvas(scaledBitmap); 
     canvas.setMatrix(scaleMatrix); 
     canvas.drawBitmap(bmp, middleX - bmp.getWidth()/2, middleY - bmp.getHeight()/2, new Paint(Paint.FILTER_BITMAP_FLAG)); 

//  check the rotation of the image and display it properly 
     ExifInterface exif; 
     try { 
      exif = new ExifInterface(filePath); 

      int orientation = exif.getAttributeInt(
        ExifInterface.TAG_ORIENTATION, 0); 
      Log.d("EXIF", "Exif: " + orientation); 
      Matrix matrix = new Matrix(); 
      if (orientation == 6) { 
       matrix.postRotate(90); 
       Log.d("EXIF", "Exif: " + orientation); 
      } else if (orientation == 3) { 
       matrix.postRotate(180); 
       Log.d("EXIF", "Exif: " + orientation); 
      } else if (orientation == 8) { 
       matrix.postRotate(270); 
       Log.d("EXIF", "Exif: " + orientation); 
      } 
      scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, 
        scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, 
        true); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     FileOutputStream out = null; 
     String filename = getFilename(); 
     try { 
      out = new FileOutputStream(filename); 

//   write the compressed bitmap at the destination specified by filename. 
      scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out); 

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

     return filename; 
    } 
private String getRealPathFromURI(String contentURI) { 
     Uri contentUri = Uri.parse(contentURI); 
     Cursor cursor = getContentResolver().query(contentUri, null, null, null, null); 
     if (cursor == null) { 
      return contentUri.getPath(); 
     } else { 
      cursor.moveToFirst(); 
      int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
      return cursor.getString(index); 
     } 
    } 


public 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 heightRatio = Math.round((float) height/ (float) reqHeight); 
     final int widthRatio = Math.round((float) width/(float) reqWidth); 
     inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;  }  final float totalPixels = width * height;  final float totalReqPixelsCap = reqWidth * reqHeight * 2;  while (totalPixels/(inSampleSize * inSampleSize) > totalReqPixelsCap) { 
     inSampleSize++; 
    } 

    return inSampleSize; 
}