一、前言：
Android用ContextCompat替换getResources()获取资源; android SDK 升级到 23 之后，getResource.getColor(R.color.color_name) 过时， 可以使用新加入的方法 ContextCompat.getColor(context, R.color.color_name) 。
SDK 升级到 23 之后，Context类已经提供了getColor（int id）等一系列获取资源文件的方法。
二、使用：
1、MainActivity 类
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var tvTitle = findViewById(R.id.tv_title)
var ivPic = findViewById(R.id.iv_pic)
// ==========设置文字和颜色===========
//1、设置标题
tvTitle.text = resources.getText(R.string.title)
//2、设置颜色过时
//tvTitle.setTextColor(resources.getColor(R.color.color_FF0000))
//3、设置颜色最新方法
// tvTitle.setTextColor(ContextCompat.getColor(this,R.color.color_FF0000))
//4、扩展的方式设置文字
tvTitle.textResource = R.string.title
//5、扩展的方式设置文字颜色
tvTitle.textColorResource= R.color.color_FF0000
//6、设置颜色
tvTitle.setTextColor(Color.parseColor("#FF47A3"));
// ==========设置文字大小===========
tvTitle.textSize = resources.getDimension(R.dimen.ui_sp10)
//扩展的方式设置文字大小
tvTitle.textSizeResource(10f)
// ==========设置图片===========
// ivPic.setImageResource(R.mipmap.vip_prvite_party)
//扩展的方式设置图片
// ivPic.srcResource = R.mipmap.vip_prvite_party
//扩展的方式设置图片
ivPic.imageResource = R.mipmap.vip_prvite_party
//扩展的方式获取dp 和SP转化
var dp1 = dip(10f)
var sp1 = dimen(R.dimen.ui_dp10)
Log.d("LUO","-----dp1:$dp1")
Log.d("LUO","-----sp1:$sp1")
}
}
2、Kotlin扩展类 TextView、ImageView和Context
1、TextView类:
package com.example.myapplication.utils
import android.util.TypedValue
import android.widget.TextView
import androidx.annotation.ColorInt
var TextView.textResource: Int
get() = 0
set(value) = setText(value)
var TextView.textColorResource: Int
get() = 0
set(value) = setTextColor(context.color(value))
/**
* Set text color quickly
*/
fun TextView.textColor(@ColorInt color: Int) = setTextColor(color)
/**
* Set text size
*/
fun TextView.textSizeResource(value: Float, unit: Int = TypedValue.COMPLEX_UNIT_SP) {
when (unit) {
TypedValue.COMPLEX_UNIT_SP -> textSize = value
else -> setTextSize(unit, value)
}
}
2、ImageView类:
package com.example.myapplication.utils
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.widget.ImageView
var ImageView.srcResource: Int
get() = 0
set(value) = if (value != 0) setImageResource(value) else setImageDrawable(ColorDrawable(Color.TRANSPARENT))
var ImageView.imageResource: Int
get() = 0
set(value) {
srcResource = value
}
3、Context类:
package com.example.myapplication.utils
import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.content.res.Resources
import android.graphics.drawable.Drawable
import android.os.Build
import android.util.DisplayMetrics
import android.util.TypedValue
import androidx.annotation.AttrRes
import androidx.annotation.ColorRes
import androidx.annotation.DimenRes
import androidx.annotation.DrawableRes
import androidx.core.content.ContextCompat
/**
* Get [DisplayMetrics] from [Resources]
*/
val Context.displayMetrics: DisplayMetrics get() = resources.displayMetrics
/**
* Calculate dimensions in pixel of dip
*/
fun Context.dip(value: Float): Int = dipF(value).toInt()
/**
* @see [dip]
*/
fun Context.dip(value: Int): Int = dip(value.toFloat())
/**
* Calculate dimensions in float of dip
*/
fun Context.dipF(value: Float): Float =
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, displayMetrics)
/**
* Convert dimensions in pixel from dip
*
* @see [Context.dip]
*/
fun Context?.fromDp(dip: Float): Int = this?.dip(dip)
?: Resources.getSystem().displayMetrics.let {
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, it).toInt()
}
/**
* Convert dimensions in pixel from sp
*/
fun Context?.fromSp(sp: Float): Int =
(this?.resources ?: Resources.getSystem()).displayMetrics
.let {
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp, it).toInt()
}
/**
* Convert dimensions from pixel
*
* @param unit support [TypedValue.COMPLEX_UNIT_DIP], [TypedValue.COMPLEX_UNIT_SP], [TypedValue.COMPLEX_UNIT_PT]
*/
fun Context?.fromPix(valuePixel: Float, unit: Int = TypedValue.COMPLEX_UNIT_DIP): Float =
(this?.resources ?: Resources.getSystem()).displayMetrics
.let {
when (unit) {
TypedValue.COMPLEX_UNIT_DIP -> valuePixel.div(it.density)
TypedValue.COMPLEX_UNIT_SP -> valuePixel.div(it.scaledDensity)
TypedValue.COMPLEX_UNIT_PT -> valuePixel.div(it.xdpi).times(72F)
else -> valuePixel
}
}
/**
* Get color with [ContextCompat]
*/
fun Context.color(@ColorRes res: Int): Int = ContextCompat.getColor(this, res)
/**
* Get drawable with context directly
*/
fun Context.drawable(@DrawableRes res: Int): Drawable? =
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getDrawable(res)
} else {
resources.getDrawable(res)
}
/**
* Get dimension pixel size in [Int]
*/
fun Context.dimen(@DimenRes res: Int): Int = resources.getDimensionPixelSize(res)
/**
* Get dimension pixel size in [Float]
*/
fun Context.dimenF(@DimenRes res: Int): Float = resources.getDimension(res)
/**
* Get [Drawable] with attr-res
*/
fun Context.drawableFromAttr(@AttrRes attrRes: Int): Drawable? = intArrayOf(attrRes)
.let {
val typedArray = obtainStyledAttributes(it)
val drawable = typedArray.getDrawable(0)
typedArray.recycle()
drawable
}
fun Context.asActivity(): Activity? =
when (this) {
is Activity -> this
is ContextWrapper -> baseContext.asActivity()
else -> null
}
3、其它需要的xml类
1、dimens.xml
0.5dp
1dp
2dp
3dp
4dp
5dp
6dp
7dp
8dp
1dp
10dp
11dp
12dp
13dp
14dp
15dp
16dp
17dp
18dp
19dp
20dp
21dp
22dp
23dp
24dp
25dp
26dp
27dp
28dp
29dp
30dp
31dp
32dp
33dp
34dp
35dp
36dp
37dp
38dp
39dp
40dp
41dp
42dp
43dp
44dp
45dp
46dp
47dp
48dp
49dp
50dp
51dp
52dp
53dp
54dp
55dp
56dp
57dp
58dp
59dp
60dp
61dp
62dp
64dp
65dp
70dp
75dp
80dp
85dp
90dp
95dp
100dp
104dp
180dp
1sp
2sp
3sp
4sp
5sp
6sp
7sp
8sp
1sp
10sp
11sp
12sp
13sp
14sp
15sp
16sp
17sp
18sp
19sp
20sp
21sp
22sp
23sp
24sp
25sp
26sp
27sp
28sp
2、colors.xml
#FF0000