需求如题，思路：重写webview的draw方法，除了带圆角的显示区域，将其他部分透明化。
为方便同僚，节约大家时间，在此贴出完整代码如下：
public class CusWebView extends WebView{
private Paint paint1;
private Paint paint2;
private float m_radius;
private int width;
private int height;
private int x;
private int y;
public CusWebView(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
private void init(Context context){
paint1 = new Paint();
paint1.setColor(Color.WHITE);
paint1.setAntiAlias(true);
paint1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
paint2 = new Paint();
paint2.setXfermode(null);
}
public void setRadius(int w, int h, float radius){
m_radius = radius;
width = w;
height = h;
}
@Override
public void draw(Canvas canvas) {
x = this.getScrollX();
y = this.getScrollY();
Bitmap bitmap = Bitmap.createBitmap(x + width, y + height,
Config.ARGB_8888);
Canvas canvas2 = new Canvas(bitmap);
super.draw(canvas2);
drawLeftUp(canvas2);
drawRightUp(canvas2);
drawLeftDown(canvas2);
drawRightDown(canvas2);
canvas.drawBitmap(bitmap, 0, 0, paint2);
bitmap.recycle();
}
private void drawLeftUp(Canvas canvas) {
Path path = new Path();
path.moveTo(x, m_radius);
path.lineTo(x, y);
path.lineTo(m_radius, y);
path.arcTo(new RectF(x, y, x + m_radius * 2, y + m_radius * 2), -90, -90);
path.close();
canvas.drawPath(path, paint1);
}
private void drawLeftDown(Canvas canvas) {
Path path = new Path();
path.moveTo(x, y + height - m_radius);
path.lineTo(x, y + height);
path.lineTo(x + m_radius, y + height);
path.arcTo(new RectF(x, y + height - m_radius * 2,
x + m_radius * 2, y + height), 90, 90);
path.close();
canvas.drawPath(path, paint1);
}
private void drawRightDown(Canvas canvas) {
Path path = new Path();
path.moveTo(x + width - m_radius, y + height);
path.lineTo(x + width, y + height);
path.lineTo(x + width, y + height - m_radius);
path.arcTo(new RectF(x + width - m_radius * 2, y + height
- m_radius * 2, x + width, y + height), 0, 90);
path.close();
canvas.drawPath(path, paint1);
}
private void drawRightUp(Canvas canvas) {
Path path = new Path();
path.moveTo(x + width, y + m_radius);
path.lineTo(x + width, y);
path.lineTo(x + width - m_radius, y);
path.arcTo(new RectF(x + width - m_radius * 2, y, x + width,
y + m_radius * 2), -90, 90);
path.close();
canvas.drawPath(path, paint1);
}
}
理论上此方法适用于所有view