自定義View圓角控件

今天遇到一個很憨的問題,要把一個自定義View設定成圓角,一直設定background,一直沒起作用,在網上百度了一下,找到這個,親測管用,供大家參考一下.

public class CornerView extends View {
    private final RectF roundRect = new RectF();
    private float rect_adius = 600;
    private final Paint maskPaint = new Paint();
    private final Paint zonePaint = new Paint();

    public CornerView(Context context) {
        super(context);
        init();
    }

    public CornerView(Context context,  AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CornerView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }


    private void init() {
        maskPaint.setAntiAlias(true);
        maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        //
        zonePaint.setAntiAlias(true);
        zonePaint.setColor(Color.WHITE);
        //
        float density = getResources().getDisplayMetrics().density;
        rect_adius = rect_adius * density;
    }

    public void setCorner(float adius) {
        rect_adius = adius;
        invalidate();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        int w = getWidth();
        int h = getHeight();
        roundRect.set(0, 0, w, h);
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
        canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
        canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
        super.draw(canvas);
        canvas.restore();
    }
}

           

轉自: Android圓角自定義.