RoundCornnerTextView

public class RoundCornerTextView extends TextView {    public RoundCornerTextView(Context context) {        super(context);    }    //        public RoundCornerTextView(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundCornerTextView);        float dp = typedArray.getDimension(R.styleable.RoundCornerTextView_rc_corner_radius, 0.0f);        // 最终绘图的单位是像素        int cornerRadius = dp2px(context, dp);        typedArray.recycle();        // 替换 background        ColorDrawable originalBackground = (ColorDrawable) getBackground();        int bgColor = originalBackground != null ? originalBackground.getColor() : Color.TRANSPARENT;        PaintDrawable newBackground = new PaintDrawable();        newBackground.setCornerRadius(cornerRadius);        newBackground.getPaint().setColor(bgColor);        setBackground(newBackground);    }    //    protected int dp2px(Context context, float dp) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dp * scale + 0.5f);    }}