從Android相機捕獲圖像時獲得更小尺寸的圖像

在我的android應用程序中，當我從相機捕獲圖像時，我想重新調整它的尺寸。當我從畫廊拍攝圖像時，我很成功地重新調整大小。但是當我從相機捕捉時，我失敗了。請幫助從Android相機捕獲圖像時獲得更小尺寸的圖像

if (requestCode == take_image && resultCode == RESULT_OK && null != data) { 
    thumbnail = (Bitmap) data.getExtras().get("data"); 
    image2 = me1; 
    addattachmentsToListView(image2); 
}

這裏是從SD卡調整圖像的代碼：

if (requestCode == UploadFile && resultCode == RESULT_OK && null != data) { 
    Uri selectedImage = data.getData(); 
    try { 

     Bitmap image=(decodeUri(selectedImage)); 
     addattachmentsToListView(image); 
     } catch (FileNotFoundException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
} 


private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException { 
    BitmapFactory.Options o = new BitmapFactory.Options(); 
    o.inJustDecodeBounds = true; 
    BitmapFactory.decodeStream(
    getContentResolver().openInputStream(selectedImage), null, o); 

    final int REQUIRED_SIZE = 200; 

    int width_tmp = o.outWidth, height_tmp = o.outHeight; 
    int scale = 1; 
    while (true) { 
     if (width_tmp/1.5 &lt; REQUIRED_SIZE || height_tmp/1.5 &lt; REQUIRED_SIZE) { 
      break; 
     } 
     width_tmp /= 4; 
     height_tmp /= 4; 

     // width_tmp = 20; 
     // height_tmp = 20; 
     scale *= 2; 
    } 

    BitmapFactory.Options o2 = new BitmapFactory.Options(); 
    o2.inSampleSize = scale; 
    return BitmapFactory.decodeStream(
    getContentResolver().openInputStream(selectedImage), null, o2); 
}

來源

2013-11-01 user2768215

您是將圖像保存在設備上還是想調整從相機獲取的框架？ – fasteque

@fasteque我想調整框架 – user2768215

檢查此http://stackoverflow.com/questions/20799901/creating-dcf-thumbnail-from-jpeg你在bmp中縮放圖像並再次創建scaled JPG。 –

在你public void onPreviewFrame(byte[] data, Camera camera)，你可以通過這種方式獲得的位圖：

Bitmap bmp = YUVtoBMP(data, ImageFormat.NV21, YOUR_CAMERA_SIZE); 

public Bitmap YUVtoBMP(byte[] data, int format, Camera.Size size) 
{ 
    ByteArrayOutputStream out = new ByteArrayOutputStream(); 
    YuvImage yuvImage = new YuvImage(data, format, size.width, size.height, null); 
    yuvImage.compressToJpeg(new Rect(0, 0, size.width, size.height), 50, out); 
    byte[] imageBytes = out.toByteArray(); 
    Options options = new Options(); 
    options.inPreferQualityOverSpeed = false; 
    Bitmap image = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, options); 

    return image; 
}

爲了擴大一個位圖，你可以：

Bitmap scaled = Bitmap.createScaledBitmap(bmp, NEW_WIDTH, NEW_HEIGHT, true);

這只是一個提示：從此開始並嘗試尋找優化（如果有的話）。

來源

2013-11-01 11:24:17 fasteque

從Android相機捕獲圖像時獲得更小尺寸的圖像

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