Android Drawable总结
Drawable有几种
1：Bitmap
? ? ? ?支持格式:.png (preferred), .jpg (acceptable), .gif (discouraged).
将Bitmap文件放在drawable文件夹下会被AAPT自动优化
2:XML Bitmap
? ? ? ?An XML bitmap is a resource defined in XML that points to a bitmap file.?
? ? ? ?The effect is an alias for a raw bitmap file
? ? ? ?<?xml version="1.0" encoding="utf-8"?>
<bitmap
? ? xmlns:android="http://schemas.android.com/apk/res/android"
? ? android:src="@[package:]drawable/drawable_resource"
? ? android:antialias=["true" | "false"]
? ? android:dither=["true" | "false"] ? ?抖动？？
? ? android:filter=["true" | "false"] ? ?控制图片是否缩放或则拉伸
? ? android:gravity=["top" | "bottom" | "left" | "right" | "center_vertical" |
? ? ? ? ? ? ? ? ? ? ? "fill_vertical" | "center_horizontal" | "fill_horizontal" |
? ? ? ? ? ? ? ? ? ? ? "center" | "fill" | "clip_vertical" | "clip_horizontal"]
? ? android:tileMode=["disabled" | "clamp" | "repeat" | "mirror"] />
? ? Defines the tile mode. When the tile mode is enabled, the bitmap is repeated.?
? ? Gravity is ignored when the tile mode is enabled.
3:Nine-Patch
? ? ?You typically assign this type of image as the background of a View?
? ? ?that has at least one dimension set to "wrap_content",?
? ? ?and when the View grows to accomodate the content,
? ? ?the Nine-Patch image is also scaled to match the size of the View
4:XML Nine-Patch
? ? ?An XML Nine-Patch is a resource defined in XML that points to a Nine-Patch file.
? ? ?The XML can specify dithering for the image
? ? ?<?xml version="1.0" encoding="utf-8"?>
<nine-patch
? ? xmlns:android="http://schemas.android.com/apk/res/android"
? ? android:src="@[package:]drawable/drawable_resource"
? ? android:dither=["true" | "false"] /> ?图片与屏幕像素不一样的时候，会拉伸？
5:Layer List
? ? A LayerDrawable is a drawable object that manages an array of other drawables.
? ? <layer-list
? ? xmlns:android="http://schemas.android.com/apk/res/android" >
? ? <item
? ? ? ? android:drawable="@[package:]drawable/drawable_resource"
? ? ? ? android:id="@[+][package:]id/resource_name"
? ? ? ? android:top="dimension"
? ? ? ? android:right="dimension"
? ? ? ? android:bottom="dimension"
? ? ? ? android:left="dimension" ></item>
? ? </layer-list>
? ? <item></item>标签里可以利用<bitmap/>标签装载图片，此时图片将不会被拉伸。
? ? <item>
? ? ? ? <bitmap android:src="@drawable/image"
? ? ? ? ? ? ?android:gravity="center" />
? ? </item>
6：State List
? ? 不同状态显示不同的图片 常用于背景
? ? During each state change, the state list is traversed top to bottom and the first item?
? ? that matches the current state is used—the selection is not based on the "best match,"?
? ? but simply the first item that meets the minimum criteria of the state.
? ? <?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
? ? <item android:state_pressed="true"
? ? ? ? ? android:drawable="@drawable/button_pressed" /> <!-- pressed -->
? ? <item android:state_focused="true"
? ? ? ? ? android:drawable="@drawable/button_focused" /> <!-- focused -->
? ? <item android:state_hovered="true"
? ? ? ? ? android:drawable="@drawable/button_focused" /> <!-- hovered -->
? ? <item android:drawable="@drawable/button_normal" /> <!-- default -->
</selector>
7:Level List 有什么用
? ? ?A Drawable that manages a number of alternate Drawables, each assigned a maximum numerical value.
? ? ?Setting the level value of the drawable with setLevel() loads the drawable resource in the level list?
? ? ?that has a android:maxLevel value greater than or equal to the value passed to the method.
? ? ? <level-list xmlns:android="http://schemas.android.com/apk/res/android" >
? ? ? ? ? <item
? ? ? ? ? ? ? android:drawable="@drawable/status_off"
? ? ? ? ? ? ? android:maxLevel="0" />
? ? ? ? ? <item
? ? ? ? ? ? ? android:drawable="@drawable/status_on"
? ? ? ? ? ? ? android:maxLevel="1" />
? ? ? ?</level-list>
8:Transition Drawable ?可以让两张图片同时淡入淡出(也只能包含两张图片)
? ? ? <?xml version="1.0" encoding="utf-8"?>
? ? ? ? ?<transition xmlns:android="http://schemas.android.com/apk/res/android">
? ? ? ? ? ? <item android:drawable="@drawable/on" />
? ? ? ? ? ? <item android:drawable="@drawable/off" />
? ? ? ? ?</transition>
9：Inset Drawable
? ? A drawable defined in XML that insets another drawable by a specified distance.?
? ?This is useful when a View needs a background that is smaller than the View's actual bounds.
? ?<inset xmlns:android="http://schemas.android.com/apk/res/android"
? ? android:drawable="@drawable/background"
? ? android:insetTop="10dp"
? ? android:insetLeft="10dp" />
10:Clip Drawable 把原图的长，宽，厚度都分成10000level，以此切割
? ? <?xml version="1.0" encoding="utf-8"?>
? ? ? ? ?<clip xmlns:android="http://schemas.android.com/apk/res/android"
? ? android:drawable="@drawable/android"
? ? android:clipOrientation="horizontal"
? ? android:gravity="left" />?
? ? ImageView imageview = (ImageView) findViewById(R.id.image);
? ? ClipDrawable drawable = (ClipDrawable) imageview.getDrawable();
? ? drawable.setLevel(drawable.getLevel() + 1000);
? ? Increasing the level reduces the amount of clipping and slowly reveals the image.
11：Scale Drawable
? ? ?A drawable defined in XML that changes the size of another drawable based on its current level.
? ? ?<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
? ?android:drawable="@drawable/logo"
? ? ?android:scaleGravity="center_vertical|center_horizontal"
? ?android:scaleHeight="80%"
? ?android:scaleWidth="80%" />
12：Shape Drawable
? ? ? ?<shape
? ? xmlns:android="http://schemas.android.com/apk/res/android"
? ? android:shape=["rectangle" | "oval" | "line" | "ring"] >
? ? <corners
? ? ? ? android:radius="integer"
? ? ? ? android:topLeftRadius="integer"
? ? ? ? android:topRightRadius="integer"
? ? ? ? android:bottomLeftRadius="integer"
? ? ? ? android:bottomRightRadius="integer" />
? ? <gradient
? ? ? ? android:angle="integer" ? ?必须是45的倍数，0:从左到右，90:从下到上
? ? ? ? android:centerX="integer"
? ? ? ? android:centerY="integer"
? ? ? ? android:centerColor="integer"
? ? ? ? android:endColor="color"
? ? ? ? android:gradientRadius="integer" ? ? android:type="radial"时有效， ?放射状
? ? ? ? android:startColor="color"
? ? ? ? android:type=["linear" | "radial" | "sweep"]
? ? ? ? android:useLevel=["true" | "false"] />
? ? <padding
? ? ? ? android:left="integer"
? ? ? ? android:top="integer"
? ? ? ? android:right="integer"
? ? ? ? android:bottom="integer" />
? ? <size ? ? ? ? ? ? ? ? ? ? ? ? ? ?默认是填满控件
? ? ? ? android:width="integer"
? ? ? ? android:height="integer" />
? ? <solid
? ? ? ? android:color="color" />
? ? <stroke
? ? ? ? android:width="integer"
? ? ? ? android:color="color"
? ? ? ? android:dashWidth="integer" ? ? 跟下面一个属性配套，要一起设置才有效
? ? ? ? android:dashGap="integer" />
</shape>
?
? ? 若要有不清楚的，请查看官方文档:http://developer.android.com/guide/topics/resources/drawable-resource.html
