最近公司项目爱用到圆角背景的RelativeLayout,一般圆角背景的实现思路无非就是两种,第一种用.xml实现,需要用到.9图片,防止图片变形,如果要改变背景颜色的话,不可避免的要找美工妹子作图,看着我的美工妹子一脸幽怨的小表情,我打算还是用第二种方法吧,就是自已用代码绘制一个,要改变角度,要改变颜色,改下设置就可以了,轻松又便捷,简单又方便,妈妈再也不用担心我的明天了~~~~
import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.RectF; import android.util.AttributeSet; import android.view.View; import android.widget.RelativeLayout; public class RoundRelativeLayoutTest extends RelativeLayout { private final RectF roundRect = new RectF(); private float rect_adius = 10; //单位为像素 private final Paint maskPaint = new Paint(); private final Paint zonePaint = new Paint(); private View mView; private Context mContext; public RoundRelativeLayoutTest(Context context) { super(context); init(); } public RoundRelativeLayoutTest(Context context, AttributeSet attrs) { super(context, attrs); init(); } public RoundRelativeLayoutTest(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); } @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(); roundRectSet(w, h); } @Override public void draw(Canvas canvas) { canvasSetLayer(canvas); super.draw(canvas); canvas.restore(); } /** * 从新设置圆角 * @param adius */ public void setRectAdius(float adius) { rect_adius = adius; if (mView != null) { mView.invalidate(); } } /** * 圆角区域设置 * @param width * @param height */ public void roundRectSet(int width, int height) { roundRect.set(0, 0, width, height); } /** * 画布区域裁剪 * @param canvas */ public void canvasSetLayer(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); } }