一開始使用shape的方式實現,發現不行,網頁出來以後就會填充滿
後來使用搜索引擎,看到其他人實現的webview圓角效果,連接 http://blog.csdn.net/zxwd2015/article/details/64554653
實測,性能太差,卡頓明顯
於是自己重寫
看了下他的代碼,搞了4個path,各種moveTo和lineTo,我就想能不能把4個path合成1個path
或者能不能找到一個函數可以搞定的,找到了addRoundRect函數
呃,這就很舒服
鏈接:
http://www.cnblogs.com/everhad/p/6161083.html
http://blog.csdn.net/qiushi_1990/article/details/53188554
所以,自己改了下他們的代碼
完整代碼如下:
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
/** * 圓角webview */ public class CornersWebView extends WebView { private float top_left = 0; private float top_right = 0; private float bottom_left = 0; private float bottom_right = 0; private int vWidth; private int vHeight; private int x; private int y; private Paint paint1; private Paint paint2; private float[] radiusArray = {0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f}; public CornersWebView(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public CornersWebView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context, attrs); } private void init(Context context, AttributeSet attrs) { paint1 = new Paint(); paint1.setColor(Color.WHITE); paint1.setAntiAlias(true); paint1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); paint2 = new Paint(); paint2.setXfermode(null); final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.cornersWebView); // 讀取xml styleable,attrs是xml屬性的集合 top_left = a.getDimension(R.styleable.cornersWebView_top_left, 0); top_right = a.getDimension(R.styleable.cornersWebView_top_right, 0); bottom_left = a.getDimension(R.styleable.cornersWebView_bottom_left, 0); bottom_right = a.getDimension(R.styleable.cornersWebView_bottom_right, 0); setRadius(top_left, top_right, bottom_right, bottom_left); } /** * 設置四個角的圓角半徑 */ public void setRadius(float leftTop, float rightTop, float rightBottom, float leftBottom) { radiusArray[0] = leftTop; radiusArray[1] = leftTop; radiusArray[2] = rightTop; radiusArray[3] = rightTop; radiusArray[4] = rightBottom; radiusArray[5] = rightBottom; radiusArray[6] = leftBottom; radiusArray[7] = leftBottom; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); vWidth = getMeasuredWidth(); vHeight = getMeasuredHeight(); } @Override public void onDraw(Canvas canvas) { Log.e("jiejing", "onDraw"); x = this.getScrollX(); y = this.getScrollY(); Path path = new Path(); path.addRoundRect(new RectF(0, y, x + vWidth, y + vHeight), radiusArray, Path.Direction.CW); // 使用半角的方式,性能比較好 canvas.clipPath(path); super.onDraw(canvas); } }
注意:
cavas.clipPath不支持硬件加速,記得在AndroidManifest.xml中設置不使用硬件加速。不然效果出不來
或者myView.setLayerType(View.
LAYER_TYPE_SOFTWARE
, null); //關閉硬件加速