android 动态设置圆角背景（来自http://www.oschina.net/code/snippet_189899_23696）

调用：    categoryIV = (TextView) this.findViewById(R.id.categoryIV_text);
       StateRoundRectDrawable mRoundRectDradable = new              StateRoundRectDrawable(getResources().getColor(R.color.white), getResources().getColor(R.color.blue));
       mRoundRectDradable.setBottomLeftRadius(15);
       mRoundRectDradable.setTopRightRadius(15);
       categoryIV.setBackgroundDrawable(mRoundRectDradable);

类：import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.shapes.RoundRectShape;

public class RoundRectDradable extends Drawable{
   private static final float DEFAULT_RADIUS = 6.f;
   private Paint mPaint = new Paint();
   private RoundRectShape mShape;
   private float[] mOuter;
   private int mColor;
   private int mPressColor;
   private float mTopLeftRadius = DEFAULT_RADIUS;
   private float mTopRightRadius = DEFAULT_RADIUS;
   private float mBottomLeftRadius = DEFAULT_RADIUS;
   private float mBottomRightRadius = DEFAULT_RADIUS;
   public RoundRectDradable() {
       mColor = Color.WHITE;
       mPressColor = Color.WHITE;
       mPaint.setColor(mColor);
       mPaint.setAntiAlias(true);
   }

   public float getTopLeftRadius() {
       return mTopLeftRadius;
   }

   public void setTopLeftRadius(float topLeftRadius) {
       this.mTopLeftRadius = topLeftRadius;
   }

   public float getTopRightRadius() {
       return mTopRightRadius;
   }

   public void setTopRightRadius(float topRightRadius) {
       this.mTopRightRadius = topRightRadius;
   }

   public float getBottomLeftRadius() {
       return mBottomLeftRadius;
   }

   public void setBottomLeftRadius(float bottomLeftRadius) {
       this.mBottomLeftRadius = bottomLeftRadius;
   }

   public float getBottomRightRadius() {
       return mBottomRightRadius;
   }

   public void setBottomRightRadius(float bottomRightRadius) {
       this.mBottomRightRadius = bottomRightRadius;
   }

   public int getPressColor() {
       return mPressColor;
   }

   public void setPressColor(int pressColor) {
       this.mPressColor = pressColor;
   }

   @Override
   protected void onBoundsChange(Rect bounds) {
       super.onBoundsChange(bounds);
       refreshShape();
       mShape.resize(bounds.right - bounds.left, bounds.bottom - bounds.top);
   }

   private void refreshShape(){
       mOuter = new float[]{mTopLeftRadius, mTopLeftRadius
               , mTopRightRadius, mTopRightRadius

   , mBottomRightRadius, mBottomLeftRadius
               , mBottomLeftRadius, mBottomLeftRadius
               };
       mShape = new RoundRectShape(mOuter, null, null);
   }

   public void setColor(int color){
       mColor = color;
       mPaint.setColor(color);
   }

   @Override
   public void draw(Canvas canvas) {
       mShape.draw(canvas, mPaint);
   }

   @Override
   public void setAlpha(int alpha) {
       mPaint.setAlpha(alpha);
   }

   @Override
   public void setColorFilter(ColorFilter cf) {
       mPaint.setColorFilter(cf);
   }

   @Override
   public int getOpacity() {
       return mPaint.getAlpha();
   }
}

类2：import android.graphics.Rect;
import android.graphics.drawable.StateListDrawable;

public class StateRoundRectDrawable extends StateListDrawable{
   private static final float DEFAULT_RADIUS = 6.f;
   private float mTopLeftRadius = DEFAULT_RADIUS;
   private float mTopRightRadius = DEFAULT_RADIUS;
   private float mBottomLeftRadius = DEFAULT_RADIUS;
   private float mBottomRightRadius = DEFAULT_RADIUS;
   private int mNormalColor;
   private int mPressedColor;
   private RoundRectDradable mNormalDradable;
   private RoundRectDradable mPressedDradable;
   public StateRoundRectDrawable(int normalCorlor, int pressColor) {
       this.mNormalColor = normalCorlor;
       this.mPressedColor = pressColor;
   }

   @Override
   protected void onBoundsChange(Rect bounds) {
       if(mNormalDradable == null){
           mNormalDradable = new RoundRectDradable();
           mNormalDradable.setTopLeftRadius(mTopLeftRadius);
           mNormalDradable.setTopRightRadius(mTopRightRadius);
           mNormalDradable.setBottomLeftRadius(mBottomLeftRadius);
           mNormalDradable.setBottomRightRadius(mBottomRightRadius);
           mNormalDradable.setColor(mNormalColor);
           mNormalDradable.onBoundsChange(bounds);
       }
       if(mPressedDradable == null){
           mPressedDradable = new RoundRectDradable();
           mPressedDradable.setTopLeftRadius(mTopLeftRadius);
           mPressedDradable.setTopRightRadius(mTopRightRadius);
           mPressedDradable.setBottomLeftRadius(mBottomLeftRadius);
           mPressedDradable.setBottomRightRadius(mBottomRightRadius);
           mPressedDradable.setColor(mPressedColor);
           mPressedDradable.onBoundsChange(bounds);
       }
       this.addState(new int[]{-android.R.attr.state_pressed}, mNormalDradable);
       this.addState(new int[]{android.R.attr.state_pressed}, mPressedDradable);
   }

   public float getTopLeftRadius() {
       return mTopLeftRadius;
   }

   public void setTopLeftRadius(float topLeftRadius) {
       this.mTopLeftRadius = topLeftRadius;
   }

   public float getTopRightRadius() {
       return mTopRightRadius;
   }

   public void setTopRightRadius(float topRightRadius) {
       this.mTopRightRadius = topRightRadius;
   }

   public float getBottomLeftRadius() {
       return mBottomLeftRadius;
   }

   public void setBottomLeftRadius(float bottomLeftRadius) {
       this.mBottomLeftRadius = bottomLeftRadius;
   }

   public float getBottomRightRadius() {
       return mBottomRightRadius;
   }

   public void setBottomRightRadius(float bottomRightRadius) {
       this.mBottomRightRadius = bottomRightRadius;
   }

   public int getNormalColor() {
       return mNormalColor;
   }

   public void setNormalColor(int normalColor) {
       this.mNormalColor = normalColor;
   }

   public int getPressedColor() {
       return mPressedColor;
   }

   public void setPressedColor(int pressedColor) {
       this.mPressedColor = pressedColor;
   }

}

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