question: private Bitmap compress ( String imagePath , int width , int height ) { BitmapFactory . Options options = new BitmapFactory . Options ( ) ; options . inJustDecodeBounds = true ; BitmapFactory . decodeFile ( imagePath , options ) ; int outH = options . outHeight ; int outW = options . outWidth ; int inSampleSize = 1 ; if ( outH > height || outW > width ) { int halfH = outH / 2 ; int halfW = outW / 2 ; while ( ( halfH / inSampleSize ) > height && ( halfW / inSampleSize ) > width ) { inSampleSize *= 2 ; } } options . inSampleSize = inSampleSize ; options . inJustDecodeBounds = false ; int heightRatio = ( int ) Math . ceil ( options . outHeight / ( float ) height ) ; int widthRatio = ( int ) Math . ceil ( options . outWidth / ( float ) width ) ; if ( heightRatio > 1 || widthRatio > 1 ) { if ( heightRatio > widthRatio ) { options . inSampleSize = heightRatio ; } else { options . inSampleSize = widthRatio ; } } options . inJustDecodeBounds = false ; return BitmapFactory . decodeFile ( imagePath , options ) ; }
target:  obtain the thumbnail that specify the size