自定义ViewDemo
public class VerticalOffsetLayout extends ViewGroup {
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private static final int OFFSET = 100;
private Paint mPaint;
public VerticalOffsetLayout(Context context) {
super(context);
init(context, null, 0);
}
public VerticalOffsetLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
public VerticalOffsetLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
mPaint = new Paint(Color.BLUE);
mPaint.setAntiAlias(true);
mPaint.setAlpha(125);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int width = 0;
int height = 0;
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
ViewGroup.LayoutParams lp = child.getLayoutParams();
int childWidthSpec = getChildMeasureSpec(widthMeasureSpec, 0, lp.width);
int childHeightSpec = getChildMeasureSpec(heightMeasureSpec, 0, lp.height);
child.measure(childWidthSpec, childHeightSpec);
}
switch (widthMode) {
case MeasureSpec.EXACTLY:
width = widthSize;
break;
case MeasureSpec.AT_MOST:
case MeasureSpec.UNSPECIFIED:
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
int widthAddOffset = i * OFFSET + child.getMeasuredWidth();
width = Math.max(width, widthAddOffset);
}
break;
default:
break;
}
switch (heightMode) {
case MeasureSpec.EXACTLY:
height = heightSize;
break;
case MeasureSpec.AT_MOST:
case MeasureSpec.UNSPECIFIED:
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
height = height + child.getMeasuredHeight();
}
break;
default:
break;
}
setMeasuredDimension(width, height);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int left = 0;
int right = 0;
int top = 0;
int bottom = 0;
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
left = i * OFFSET;
right = left + child.getMeasuredWidth();
bottom = top + child.getMeasuredHeight();
child.layout(left, top, right, bottom);
top += child.getMeasuredHeight();
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int x = getWidth()/2;
int y = getHeight()/2;
canvas.drawCircle(x, y, Math.min(x, y), mPaint);
}
}
分享标题:自定义ViewDemo
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