com.xuexiang.xui.utils

Class Utils

java.lang.Object

com.xuexiang.xui.utils.Utils

public final class Utils
extends java.lang.Object

工具类（不建议外部调用)

Since:

2018/11/26 下午5:07

Author:

xuexiang

Method Summary

Modifier and Type	Method and Description
static <T> T	checkNotNull(T t, java.lang.String message) 检查是否为空指针
static void	checkNull(java.lang.Object object, java.lang.String hint) 检查是否为空指针
static void	clearImageView(android.view.View view) 遍历View,清除所有ImageView的缓存
static void	clearImgMemory(android.widget.ImageView imageView) 清空图片的内存
static void	closeIOQuietly(java.io.Closeable... closeables) 安静关闭 IO
static int	getAbsListViewHeightBasedOnChildren(android.widget.AbsListView view) get AbsListView height according to every children
static android.graphics.drawable.Drawable	getAppIcon(android.content.Context context) 获取应用的图标
static android.graphics.Bitmap	getBitmap(java.lang.String filePath) 获取bitmap
static android.graphics.Bitmap	getBitmapFromDrawable(android.graphics.drawable.Drawable drawable) 将Drawable转化为Bitmap
static int	getListViewHeightBasedOnChildren(android.widget.ListView view) get ListView height according to every children
static int	getNumberDigits(int number) 获取数值的位数，例如9返回1，99返回2，999返回3
static int	getScreenHeight(android.content.Context context) 得到设备屏幕的高度
static int	getScreenWidth(android.content.Context context) 得到设备屏幕的宽度
static int	getStatusBarHeight() 计算状态栏高度高度 getStatusBarHeight
static boolean	isFileExist(java.lang.String filePath) Indicates if this file represents a file on the underlying file system.
static boolean	isLight(int color)
static boolean	isNullOrEmpty(java.lang.CharSequence string)
static boolean	isSupportColorAttrs() 支持?attrs属性 http://stackoverflow.com/questions/27986204 ：As mentioned here on API < 21 you can't use attrs to color in xml drawable.
static void	recycleBackground(android.view.View v) 释放图片资源
static android.graphics.Bitmap	rotate(android.graphics.Bitmap bitmap, int angle) 旋转图片
static void	setBackground(android.content.Context context, android.view.View v, int res) View设备背景
static android.graphics.ColorFilter	setDrawableTintColor(android.graphics.drawable.Drawable drawable, int tintColor) 设置Drawable的颜色 这里不对Drawable进行mutate()，会影响到所有用到这个Drawable的地方，如果要避免，请先自行mutate()
static android.graphics.Bitmap	zoom(android.graphics.Bitmap bitmap, int w, int h) 放大缩小图片

Methods inherited from class java.lang.Object

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

Method Detail

getScreenWidth

public static int getScreenWidth(android.content.Context context)

得到设备屏幕的宽度

getScreenHeight

public static int getScreenHeight(android.content.Context context)

得到设备屏幕的高度

getStatusBarHeight

public static int getStatusBarHeight()

计算状态栏高度高度 getStatusBarHeight

Returns:

getListViewHeightBasedOnChildren

public static int getListViewHeightBasedOnChildren(android.widget.ListView view)

get ListView height according to every children

Parameters:

view -

Returns:

getAbsListViewHeightBasedOnChildren

public static int getAbsListViewHeightBasedOnChildren(android.widget.AbsListView view)

get AbsListView height according to every children

Parameters:

view -

Returns:

setBackground

public static void setBackground(android.content.Context context,
                                 android.view.View v,
                                 int res)

View设备背景

Parameters:

context -

v -

res -

recycleBackground

public static void recycleBackground(android.view.View v)

释放图片资源

Parameters:

v -

clearImageView

public static void clearImageView(android.view.View view)

遍历View,清除所有ImageView的缓存

Parameters:

view -

clearImgMemory

public static void clearImgMemory(android.widget.ImageView imageView)

清空图片的内存

zoom

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

放大缩小图片

Parameters:

bitmap - 源Bitmap

w - 宽

h - 高

Returns:

目标Bitmap

closeIOQuietly

public static void closeIOQuietly(java.io.Closeable... closeables)

安静关闭 IO

Parameters:

closeables - closeables

isFileExist

public static boolean isFileExist(java.lang.String filePath)

Indicates if this file represents a file on the underlying file system.

Parameters:

filePath - 文件路径

Returns:

是否存在文件

getBitmap

public static android.graphics.Bitmap getBitmap(java.lang.String filePath)

获取bitmap

Parameters:

filePath - 文件路径

Returns:

bitmap

checkNull

public static void checkNull(java.lang.Object object,
                             java.lang.String hint)

检查是否为空指针

Parameters:

object -

hint -

checkNotNull

public static <T> T checkNotNull(T t,
                                 java.lang.String message)

检查是否为空指针

Parameters:

t -

message -

rotate

public static android.graphics.Bitmap rotate(android.graphics.Bitmap bitmap,
                                             int angle)

旋转图片

Parameters:

angle - 旋转角度

bitmap - 要旋转的图片

Returns:

旋转后的图片

getBitmapFromDrawable

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

将Drawable转化为Bitmap

Parameters:

drawable - Drawable

Returns:

Bitmap

getAppIcon

public static android.graphics.drawable.Drawable getAppIcon(android.content.Context context)

获取应用的图标

Parameters:

context -

Returns:

isSupportColorAttrs

public static boolean isSupportColorAttrs()

支持?attrs属性 http://stackoverflow.com/questions/27986204 ：As mentioned here on API < 21 you can't use attrs to color in xml drawable.

Returns:

isLight

public static boolean isLight(int color)

isNullOrEmpty

public static boolean isNullOrEmpty(java.lang.CharSequence string)

getNumberDigits

public static int getNumberDigits(int number)

获取数值的位数，例如9返回1，99返回2，999返回3

Parameters:

number - 要计算位数的数值，必须>0

Returns:

数值的位数，若传的参数小于等于0，则返回0

setDrawableTintColor

public static android.graphics.ColorFilter setDrawableTintColor(android.graphics.drawable.Drawable drawable,
                                                                int tintColor)

设置Drawable的颜色 这里不对Drawable进行mutate()，会影响到所有用到这个Drawable的地方，如果要避免，请先自行mutate()