com.matthewtamlin.android_utilities_library.helpers

Class BitmapHelper

java.lang.Object

com.matthewtamlin.android_utilities_library.helpers.BitmapHelper

public final class BitmapHelper
extends java.lang.Object

Static utility class for decoding Bitmap images efficiently.

Method Summary

Modifier and Type	Method and Description
static android.graphics.Bitmap	decodeSampledBitmapFromByteArray(byte[] data, int offset, int length, int desWidth, int desHeight) Efficiently decodes an image from a byte array.
static android.graphics.Bitmap	decodeSampledBitmapFromFile(java.io.File file, int desWidth, int desHeight) Efficiently decodes an image from a File.
static android.graphics.Bitmap	decodeSampledBitmapFromResource(android.content.res.Resources res, int resId, int desWidth, int desHeight) Efficiently loads an image from a resource.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

decodeSampledBitmapFromResource

public static android.graphics.Bitmap decodeSampledBitmapFromResource(android.content.res.Resources res,
                                                                      int resId,
                                                                      int desWidth,
                                                                      int desHeight)

Efficiently loads an image from a resource. The width and height of the returned Bitmap are guaranteed to be at least as large as the desired values.

Parameters:

res - a Resource object which grants access to the resource at resId

resId - the resource ID of the image to decode

desWidth - the desired width of the returned Bitmap

desHeight - the desired height of the returned Bitmap

Returns:

the scaled Bitmap

decodeSampledBitmapFromByteArray

public static android.graphics.Bitmap decodeSampledBitmapFromByteArray(byte[] data,
                                                                       int offset,
                                                                       int length,
                                                                       int desWidth,
                                                                       int desHeight)

Efficiently decodes an image from a byte array. The height and width of the returned Bitmap are guaranteed to be at least as large as the desired values.

Parameters:

data - a byte array of compressed image data

offset - the offset into data to begin parsing at

length - the number of bytes at parse, beginning at offset

desWidth - the desired width of the returned Bitmap

desHeight - the desired height of the returned Bitmap

Returns:

the scaled Bitmap

decodeSampledBitmapFromFile

public static android.graphics.Bitmap decodeSampledBitmapFromFile(java.io.File file,
                                                                  int desWidth,
                                                                  int desHeight)

Efficiently decodes an image from a File. The height and width of the returned Bitmap are guaranteed to be at least as large as the desired values.

Parameters:

file - the File to decode

desWidth - the desired width of the returned Bitmap

desHeight - the desired height of the returned Bitmap

Returns:

the scaled Bitmap