CircleImageView.java 文件源码

public CircleImageView(Context context, int color, final float radius) {
    super(context);
    final float density = getContext().getResources().getDisplayMetrics().density;
    final int diameter = (int) (radius * density * 2);
    final int shadowYOffset = (int) (density * Y_OFFSET);
    final int shadowXOffset = (int) (density * X_OFFSET);

    mShadowRadius = (int) (density * SHADOW_RADIUS);

    ShapeDrawable circle;
    if (elevationSupported()) {
        circle = new ShapeDrawable(new OvalShape());
        ViewCompat.setElevation(this, SHADOW_ELEVATION * density);
    } else {
        OvalShape oval = new OvalShadow(mShadowRadius, diameter);
        circle = new ShapeDrawable(oval);
        ViewCompat.setLayerType(this, ViewCompat.LAYER_TYPE_SOFTWARE, circle.getPaint());
        circle.getPaint().setShadowLayer(mShadowRadius, shadowXOffset, shadowYOffset,
                KEY_SHADOW_COLOR);
        final int padding = (int) mShadowRadius;
        // set padding so the inner image sits correctly within the shadow.
        setPadding(padding, padding, padding, padding);
    }
    circle.getPaint().setColor(color);
    setBackgroundDrawable(circle);
}