Drawable

1.BitmapDrawable

<?xml version="1.0" encoding="utf-8"?>        android:src="@drawable/create"                android:antialias="true"                android:dither="true"                android:filter="true"                android:gravity="                top|bottom|left|right        |center_vertical|center_horizontal|center                |fill_vertical|fill_horizontal|fill        |clip_vertical|clip_horizontal"                android:mipMap="false"                android:tileMode=" ["disabled"|"clamp"|"repeat"|"mirror"]"    >

2.NinePatchDrawable

点9图可以自动根据所需的宽高进行相应的缩放并保证不失真

属性基本和BitmapDrawable相同

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

3.ShapeDrawable

在代码中生成的是GradientDrawable对象

<?xml version="1.0" encoding="utf-8"?>    android:shape=""        android:innerRadius="@dimen/activity_horizontal_margin"            android:innerRadiusRatio="1"        android:thickness="@dimen/activity_horizontal_margin"        android:thicknessRatio="1"         android:useLevel="false"     >                                                          android:type=""                        android:angle="0"                android:centerX="1"        android:centerY="1"                android:startColor="@color/colorAccent"        android:centerColor="@color/colorAccent"        android:endColor="@color/colorAccent "                android:gradientRadius="1"                 android:useLevel="false"        />                  android:width="@dimen/activity_horizontal_margin"                android:color="@color/colorAccent"                android:dashWidth="@dimen/activity_horizontal_margin"                android:dashGap="@dimen/activity_horizontal_margin"        />

4.LayerDrawable

一种不同层次的Drawable的集合，放置不同层面而达到叠加后的效果，一个layer-list可包含多个item
默认情况下，layer-list中所有的View都会被缩放至View的大小（对于bitmap可通过android:gravity控制图片显示效果）,下面的item会覆盖上面的item。

<?xml version="1.0" encoding="utf-8"?>              android:drawable="@drawable/drawable_bitmap"                    android:top="@dimen/activity_horizontal_margin"          android:bottom="@dimen/activity_horizontal_margin"          android:left="@dimen/activity_horizontal_margin"          android:right="@dimen/activity_horizontal_margin"        >

5.StateListDrawable

不同状态选择不同drawable

<?xml version="1.0" encoding="utf-8"?>          android:constantSize="true"                    android:dither="true"                    android:variablePadding="true"    >

6.LevelListDrawable

Drawable的集合，每个Drawable都可设置最小level和最大level，View的背景可通过getBackground().setLevel（）设置不同了Level匹配不同的Drawable
ImageView的话可通过setIamgeLevel()匹配不同的Drawable

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

7.TransitionDrawable

只能实现两个Drawable的淡入淡出效果
默认显示item1

 TransitionDrawable drawable= (TransitionDrawable) mIvLevel.getBackground();        if (!mBoolean)        {            //从item1淡出，item2淡入            drawable.startTransition(1000);            mBoolean=true;        }        else        {            //反转            drawable.reverseTransition(1000);            mBoolean=false;        }

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

8.InsetDrawable

把Drawable内嵌到自己当中

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

9.ScaleDrawable

适合缩小一个特定的drawable

<?xml version="1.0" encoding="utf-8"?>       android:scaleWidth="1%"       android:scaleHeight="50%"       android:scaleGravity="center"              android:level="1"    >

10.ClipDrawable

裁剪Drawable 由clipOrientation和gravity共同决定裁剪位置

ClipDrawable clipDrawable= (ClipDrawable)mIvLevel.getDrawable();//level取值0到10000,取值越大裁剪越少 0完全裁剪，10000表示不裁剪clipDrawable.setLevel(5000);

<?xml version="1.0" encoding="utf-8"?>      android:clipOrientation="vertical"      android:gravity="center"          >

自定义Drawable

public class CustomDrawable extends Drawable {        private Paint mPaint;    public CustomDrawable(int  color) {        mPaint=new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setColor(color);    }    @Override    public void draw(Canvas canvas) {        final Rect rect=getBounds();        float cx=rect.exactCenterX();        float cy=rect.exactCenterY();        canvas.drawCircle(cx,cy,Math.min(cx,cy),mPaint);    }    @Override    public void setAlpha(int alpha) {        mPaint.setAlpha(alpha);        invalidateSelf();    }    @Override    public void setColorFilter(ColorFilter colorFilter) {        mPaint.setColorFilter(colorFilter);    }    @Override    public int getOpacity() {        return PixelFormat.TRANSLUCENT;    }}

圆形Drawable

public class CircleImageDrawable extends Drawable {    private Paint mPaint;    private int mWidth;    private Bitmap mBitmap ;    public CircleImageDrawable(Bitmap bitmap)    {        mBitmap = bitmap ;        BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP,                Shader.TileMode.CLAMP);        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setShader(bitmapShader);        mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight());    }    @Override    public void draw(Canvas canvas)    {        canvas.drawCircle(mWidth / 2, mWidth / 2, mWidth / 2, mPaint);    }    @Override    public int getIntrinsicWidth()    {        return mWidth;    }    @Override    public int getIntrinsicHeight()    {        return mWidth;    }    @Override    public void setAlpha(int alpha)    {        mPaint.setAlpha(alpha);    }    @Override    public void setColorFilter(ColorFilter cf)    {        mPaint.setColorFilter(cf);    }    @Override    public int getOpacity()    {        return PixelFormat.TRANSLUCENT;    }}

圆角矩形Drawable

public class RoundImageDrawable extends Drawable {    private Paint mPaint;    private Bitmap mBitmap;    private RectF rectF;    public RoundImageDrawable(Bitmap bitmap)    {        mBitmap = bitmap;        BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP,                Shader.TileMode.CLAMP);        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setShader(bitmapShader);    }    @Override    public void setBounds(int left, int top, int right, int bottom)    {        super.setBounds(left, top, right, bottom);        rectF = new RectF(left, top, right, bottom);    }    @Override    public void draw(Canvas canvas)    {        canvas.drawRoundRect(rectF, 30, 30, mPaint);    }    @Override    public int getIntrinsicWidth()    {        return mBitmap.getWidth();    }    @Override    public int getIntrinsicHeight()    {        return mBitmap.getHeight();    }    @Override    public void setAlpha(int alpha)    {        mPaint.setAlpha(alpha);    }    @Override    public void setColorFilter(ColorFilter cf)    {        mPaint.setColorFilter(cf);    }    @Override    public int getOpacity()    {        return PixelFormat.TRANSLUCENT;    }}