android drawable

http://developer.android.com/guide/topics/resources/drawable-resource.html

Bitmap File

A bitmap graphic file (.png, .jpg, or .gif). Creates a BitmapDrawable.

Nine-Patch File

A PNG file with stretchable regions to allow image resizing based on content (.9.png). Creates a NinePatchDrawable.

Layer List

A Drawable that manages an array of other Drawables. These are drawn in array order, so the element with the largest index is be drawn on top. Creates a LayerDrawable.

State List

An XML file that references different bitmap graphics for different states (for example, to use a different image when a button is pressed). Creates a StateListDrawable.

Level List

An XML file that defines a drawable that manages a number of alternate Drawables, each assigned a maximum numerical value. Creates a LevelListDrawable.

Transition Drawable

An XML file that defines a drawable that can cross-fade between two drawable resources. Creates a TransitionDrawable.

Inset Drawable

An XML file that defines a drawable that insets another drawable by a specified distance. This is useful when a View needs a background drawble that is smaller than the View's actual bounds.

Clip Drawable

An XML file that defines a drawable that clips another Drawable based on this Drawable's current level value. Creates a ClipDrawable.

Scale Drawable

An XML file that defines a drawable that changes the size of another Drawable based on its current level value. Creates a ScaleDrawable

Shape Drawable

An XML file that defines a geometric shape, including colors and gradients. Creates aShapeDrawable.

1.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"]    android:filter=["true" | "false"]    android:gravity=["top" | "bottom" | "left" | "right" | "center_vertical" |                      "fill_vertical" | "center_horizontal" | "fill_horizontal" |                      "center" | "fill" | "clip_vertical" | "clip_horizontal"]    android:mipMap=["true" | "false"]    android:tileMode=["disabled" | "clamp" | "repeat" | "mirror"] />

2.Nine-Patch File

<?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"] />

3.Layer List

<?xml version="1.0" encoding="utf-8"?><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" /></layer-list>

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item>      <bitmap android:src="@drawable/android_red"        android:gravity="center" />    </item>    <item android:top="10dp" android:left="10dp">      <bitmap android:src="@drawable/android_green"        android:gravity="center" />    </item>    <item android:top="20dp" android:left="20dp">      <bitmap android:src="@drawable/android_blue"        android:gravity="center" />    </item></layer-list>

4.State List

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"    android:constantSize=["true" | "false"]    android:dither=["true" | "false"]    android:variablePadding=["true" | "false"] >    <item        android:drawable="@[package:]drawable/drawable_resource"        android:state_pressed=["true" | "false"]        android:state_focused=["true" | "false"]        android:state_hovered=["true" | "false"]        android:state_selected=["true" | "false"]        android:state_checkable=["true" | "false"]        android:state_checked=["true" | "false"]        android:state_enabled=["true" | "false"]        android:state_activated=["true" | "false"]        android:state_window_focused=["true" | "false"] /></selector>

<?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><Button    android:layout_height="wrap_content"    android:layout_width="wrap_content"    android:background="@drawable/button" />

5.Level List

<?xml version="1.0" encoding="utf-8"?><level-list    xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:drawable="@drawable/drawable_resource"        android:maxLevel="integer"        android:minLevel="integer" /></level-list>

<?xml version="1.0" encoding="utf-8"?><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>

6.Transition Drawable

<?xml version="1.0" encoding="utf-8"?><transitionxmlns: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" /></transition>

EXAMPLE:
XML file saved at res/drawable/transition.xml:

<?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><ImageButton    android:id="@+id/button"    android:layout_height="wrap_content"    android:layout_width="wrap_content"    android:src="@drawable/transition" />

ImageButton button = (ImageButton) findViewById(R.id.button);TransitionDrawable drawable = (TransitionDrawable) button.getDrawable();drawable.startTransition(500);

7.Inset Drawable

<?xml version="1.0" encoding="utf-8"?><inset    xmlns:android="http://schemas.android.com/apk/res/android"    android:drawable="@drawable/drawable_resource"    android:insetTop="dimension"    android:insetRight="dimension"    android:insetBottom="dimension"    android:insetLeft="dimension" />

<?xml version="1.0" encoding="utf-8"?><inset xmlns:android="http://schemas.android.com/apk/res/android"    android:drawable="@drawable/background"    android:insetTop="10dp"    android:insetLeft="10dp" />

8.Clip Drawable

<?xml version="1.0" encoding="utf-8"?><clip    xmlns:android="http://schemas.android.com/apk/res/android"    android:drawable="@drawable/drawable_resource"    android:clipOrientation=["horizontal" | "vertical"]    android:gravity=["top" | "bottom" | "left" | "right" | "center_vertical" |                     "fill_vertical" | "center_horizontal" | "fill_horizontal" |                     "center" | "fill" | "clip_vertical" | "clip_horizontal"] />

EXAMPLE:
XML file saved at res/drawable/clip.xml:

<?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    android:id="@+id/image"    android:background="@drawable/clip"    android:layout_height="wrap_content"    android:layout_width="wrap_content" />

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. Here it is at a level of 7000:

Note: The default level is 0, which is fully clipped so the image is not visible. When the level is 10,000, the image is not clipped and completely visible.

9.Scale Drawable

<?xml version="1.0" encoding="utf-8"?><scale    xmlns:android="http://schemas.android.com/apk/res/android"    android:drawable="@drawable/drawable_resource"    android:scaleGravity=["top" | "bottom" | "left" | "right" | "center_vertical" |                          "fill_vertical" | "center_horizontal" | "fill_horizontal" |                          "center" | "fill" | "clip_vertical" | "clip_horizontal"]    android:scaleHeight="percentage"    android:scaleWidth="percentage" />

<?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%" />

<?xml version=”1.0” encoding=”utf-8”?> <rotate xmlns:android=”http://schemas.android.com/apk/res/android”    android:drawable=”@drawable/icon”    android:fromDegrees=”0”    android:toDegrees=”90”    android:pivotX=”50%”    android:pivotY=”50%” />

使用setImageLevel方法在View对象，变换图片在0-10,000之间，对应着0-100%，默认是0

10.Shape Drawable

<?xml version="1.0" encoding="utf-8"?><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"        android:centerX="integer"        android:centerY="integer"        android:centerColor="integer"        android:endColor="color"        android:gradientRadius="integer"        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        android:width="integer"        android:height="integer" />    <solid        android:color="color" />    <stroke        android:width="integer"        android:color="color"        android:dashWidth="integer"        android:dashGap="integer" /></shape>

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <gradient        android:startColor="#FFFF0000"        android:endColor="#80FF00FF"        android:angle="45"/>    <padding android:left="7dp"        android:top="7dp"        android:right="7dp"        android:bottom="7dp" />    <corners android:radius="8dp" /></shape>