xey.elib.utils

类 ImageUtils

java.lang.Object

xey.elib.utils.ImageUtils

public class ImageUtils
extends Object

构造器概要

构造器

构造器和说明
ImageUtils()

方法概要

方法

限定符和类型	方法和说明
static int	calculateInSampleSize(android.graphics.BitmapFactory.Options options, int reqWidth, int reqHeight) Calculate an inSampleSize for use in a BitmapFactory.Options object when decoding bitmaps using the decode* methods from BitmapFactory.
static android.graphics.Bitmap	decodeSampledBitmapFromFile(String filename, int reqWidth, int reqHeight) Decode and sample down a bitmap from a file to the requested width and height.
static android.graphics.Bitmap	decodeUriAsBitmap(android.content.Context ctx, android.net.Uri uri)
static android.graphics.Bitmap	drawableToBitmap(android.graphics.drawable.Drawable drawable)
static int	getBitmapSize(android.graphics.Bitmap bitmap)
static android.graphics.Bitmap	getRoundedCornerBitmap(android.graphics.Bitmap bitmap, float roundPx) 获取图片圆角
static android.graphics.Bitmap	rotate(android.graphics.Bitmap b, int degrees) 旋转图片
static boolean	saveBitmap(File f, android.graphics.Bitmap bitmap) 保存图片到文件
static boolean	saveBitmap(String path, android.graphics.Bitmap bitmap)
static android.graphics.Bitmap	scaledBitmap(android.graphics.Bitmap src, int scale) 按比例缩放图片
static android.graphics.Bitmap	scaledBitmap(android.graphics.Bitmap src, int dstWidth, int dstHeight) 缩放图片
static android.graphics.Bitmap	toBitmap(android.graphics.drawable.Drawable drawable) 转行Drawable为Bitmap对象
static byte[]	toBytes(android.graphics.Bitmap bitmap) 将图片转换成字节数组
static android.graphics.Bitmap	zoomBitmap(android.graphics.Bitmap bitmap, int w, int h)

从类继承的方法 java.lang.Object

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

构造器详细资料

ImageUtils

public ImageUtils()

方法详细资料

getBitmapSize

public static int getBitmapSize(android.graphics.Bitmap bitmap)

rotate

public static android.graphics.Bitmap rotate(android.graphics.Bitmap b,
                             int degrees)

旋转图片

decodeSampledBitmapFromFile

public static android.graphics.Bitmap decodeSampledBitmapFromFile(String filename,
                                                  int reqWidth,
                                                  int reqHeight)

Decode and sample down a bitmap from a file to the requested width and height.

参数:

filename - The full path of the file to decode

reqWidth - The requested width of the resulting bitmap

reqHeight - The requested height of the resulting bitmap

返回:

A bitmap sampled down from the original with the same aspect ratio and dimensions that are equal to or greater than the requested width and height

calculateInSampleSize

public static int calculateInSampleSize(android.graphics.BitmapFactory.Options options,
                        int reqWidth,
                        int reqHeight)

Calculate an inSampleSize for use in a BitmapFactory.Options object when decoding bitmaps using the decode* methods from BitmapFactory. This implementation calculates the closest inSampleSize that will result in the final decoded bitmap having a width and height equal to or larger than the requested width and height. This implementation does not ensure a power of 2 is returned for inSampleSize which can be faster when decoding but results in a larger bitmap which isn't as useful for caching purposes.

参数:

options - An options object with out* params already populated (run through a decode* method with inJustDecodeBounds==true

reqWidth - The requested width of the resulting bitmap

reqHeight - The requested height of the resulting bitmap

返回:

The value to be used for inSampleSize

saveBitmap

public static boolean saveBitmap(String path,
                 android.graphics.Bitmap bitmap)

saveBitmap

public static boolean saveBitmap(File f,
                 android.graphics.Bitmap bitmap)

保存图片到文件

decodeUriAsBitmap

public static android.graphics.Bitmap decodeUriAsBitmap(android.content.Context ctx,
                                        android.net.Uri uri)

zoomBitmap

public static android.graphics.Bitmap zoomBitmap(android.graphics.Bitmap bitmap,
                                 int w,
                                 int h)

drawableToBitmap

public static android.graphics.Bitmap drawableToBitmap(android.graphics.drawable.Drawable drawable)

getRoundedCornerBitmap

public static android.graphics.Bitmap getRoundedCornerBitmap(android.graphics.Bitmap bitmap,
                                             float roundPx)

获取图片圆角

参数:

bitmap -

roundPx - 圆角度数

返回:

toBitmap

public static android.graphics.Bitmap toBitmap(android.graphics.drawable.Drawable drawable)

转行Drawable为Bitmap对象

参数:

drawable -

返回:

scaledBitmap

public static android.graphics.Bitmap scaledBitmap(android.graphics.Bitmap src,
                                   int dstWidth,
                                   int dstHeight)

缩放图片

参数:

src - 缩放原图

dstWidth - 缩放后宽

dstHeight - 缩放后高

返回:

scaledBitmap

public static android.graphics.Bitmap scaledBitmap(android.graphics.Bitmap src,
                                   int scale)

按比例缩放图片

参数:

src -

scale - 例如2 就是二分之一

返回:

toBytes

public static byte[] toBytes(android.graphics.Bitmap bitmap)

将图片转换成字节数组

参数:

bitmap -

返回: