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| public class CustomViewGroup extends ViewGroup {
public CustomViewGroup(Context context) {
super(context);
}
public CustomViewGroup(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
int mode = MeasureSpec.EXACTLY;
int childWidth = widthSize / 4;
int childHeight = heightSize / 4;
child.measure(MeasureSpec.makeMeasureSpec(childWidth, mode),
MeasureSpec.makeMeasureSpec(childHeight, mode));
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
int gravity = lp.gravity;
switch (gravity) {
case LayoutParams.TOPLEFT_GRAVITY:
child.layout(l, t, width, height);
break;
case LayoutParams.TOPRIGHT_GRAVITY:
child.layout(r - width, t, r, height);
break;
case LayoutParams.BOTTOMLEFT_GRAVITY:
child.layout(l, b - height, width, b);
break;
case LayoutParams.BOTTOMRIGHT_GRAVITY:
child.layout(r - width, b - height, r, b);
break;
case LayoutParams.CENTER_GRAVITY:
child.layout((r - width) / 2, (b - height) / 2, (r + width) / 2,
(b + height) / 2);
break;
default:
break;
}
}
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
public static class LayoutParams extends ViewGroup.LayoutParams {
public static final int UNSPECIFIED_GRAVITY = -1;
public static final int TOPLEFT_GRAVITY = 1;
public static final int TOPRIGHT_GRAVITY = 2;
public static final int BOTTOMLEFT_GRAVITY = 3;
public static final int BOTTOMRIGHT_GRAVITY = 4;
public static final int CENTER_GRAVITY = 5;
public int gravity = UNSPECIFIED_GRAVITY;
public LayoutParams(@NonNull Context c, @Nullable AttributeSet attrs) {
super(c, attrs);
final TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.CustomViewGroup);
gravity = a.getInt(R.styleable.CustomViewGroup_custom_gravity, UNSPECIFIED_GRAVITY);
a.recycle();
}
public LayoutParams(int width, int height, int gravity) {
super(width, height);
this.gravity = gravity;
}
public LayoutParams(@NonNull ViewGroup.LayoutParams source) {
super(source);
this.gravity = TOPLEFT_GRAVITY;
}
public LayoutParams(@NonNull LayoutParams source) {
super(source);
this.gravity = source.gravity;
}
}
}
|
