實作自定義任意圓角的WebView、RecyclerView等任意控件
- 以自定義RoundWebView為例
以自定義RoundWebView為例
public class RoundWebView extends WebView {
private Path mPath = new Path();
private RectF mRectF = new RectF();
private float[] mRadiusArray = {0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f};
public RoundWebView(Context context) {
this(context, null);
}
public RoundWebView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RoundWebView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
private void init(@NonNull Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundWebView); // 讀取xml styleable,attrs是xml屬性的集合
float radius = a.getDimension(R.styleable.RoundWebView_rwv_radius, 0);
float topLeftRadius = a.getDimension(R.styleable.RoundWebView_rwv_top_left_radius, 0);
float topRightRadius = a.getDimension(R.styleable.RoundWebView_rwv_top_right_radius, 0);
float bottomLeftRadius = a.getDimension(R.styleable.RoundWebView_rwv_bottom_left_radius, 0);
float bottomRightRadius = a.getDimension(R.styleable.RoundWebView_rwv_bottom_right_radius, 0);
a.recycle();
if (radius > 0) {
topLeftRadius = topRightRadius = bottomLeftRadius = bottomRightRadius = radius;
}
setRoundRadius(topLeftRadius, topRightRadius, bottomRightRadius, bottomLeftRadius);
}
/**
* 設定四個角的圓角半徑
*
* @param radius 所有圓角的半徑
*/
public void setRoundRadius(float radius) {
float result = radius > 0 ? radius : 0;
setRoundRadius(result, result, result, result);
}
/**
* 設定四個角的圓角半徑
*
* @param leftTopRadius 左上角半徑
* @param rightTopRadius 右上角半徑
* @param rightBottomRadius 右下角半徑
* @param leftBottomRadius 左下角半徑
*/
public void setRoundRadius(float leftTopRadius, float rightTopRadius,
float rightBottomRadius, float leftBottomRadius) {
mRadiusArray[0] = leftTopRadius > 0 ? leftTopRadius : 0;
mRadiusArray[1] = leftTopRadius > 0 ? leftTopRadius : 0;
mRadiusArray[2] = rightTopRadius > 0 ? rightTopRadius : 0;
mRadiusArray[3] = rightTopRadius > 0 ? rightTopRadius : 0;
mRadiusArray[4] = rightBottomRadius > 0 ? rightBottomRadius : 0;
mRadiusArray[5] = rightBottomRadius > 0 ? rightBottomRadius : 0;
mRadiusArray[6] = leftBottomRadius > 0 ? leftBottomRadius : 0;
mRadiusArray[7] = leftBottomRadius > 0 ? leftBottomRadius : 0;
invalidate();
}
@Override
public void onDraw(@NonNull Canvas canvas) {
int scrollX = this.getScrollX();
int scrollY = this.getScrollY();
mPath.reset();
mRectF.set(0, scrollY, scrollX + getWidth(), scrollY + getHeight());
// 使用半角的方式,性能比較好
mPath.addRoundRect(mRectF, mRadiusArray, Path.Direction.CW);
canvas.clipPath(mPath);
super.onDraw(canvas);
}
}
其他類型的控件隻需要改變繼承的父類即可,如果大家在使用過程中發現任何問題歡迎回報,共同進步。