我定义了一个视图.此视图包含图片,用户可以与之交互.我在主布局中定义了一个FrameLayout,并在此FrameLayout中以编程方式添加此视图.
在View构造函数中,我定义了一个MarginLayutParams,将此视图放在te屏幕的中心.代码是:
mLayoutParams = new MarginLayoutParams(picture.getWidth(), picture.getHeight);
mLayoutParams.setMargins(toCenterX, toCenterY, 0, 0);
setLayoutParams(mLayoutParams);
边距值不起作用…视图正确调整为宽度和高度定义,但视图不是按边距值缩放到视图的中心…
编辑:
我的观点的模式:
-> View1 (i want sclae this view to the center)
Activity -> FrameLayout -> View2 (i want scale this view under the view 1)
-> View3 (i want scale this view at the top right)
这是我的ViewGroup示例.我实现了一个ViewGroup来管理所有视图:
public class MainView extends ViewGroup {
public BackgroundView mBackgroundWheelArea;
public BackgroundView mBackgroundLabelArea;
public WheelCoreView wheelCoreArea;
public LabelView labelArea;
public WheelOfFortuneActivity mActivity;
public MainView(Context pContext) {
super(pContext);
mActivity = (WheelOfFortuneActivity) pContext;
mBackgroundWheelArea = new BackgroundView(pContext, R.drawable.menu_background);
wheelCoreArea = new WheelCoreView(pContext, mActivity.fromPixelToDp(mBackgroundWheelArea
.getBackgroundHeight()), mActivity.fromPixelToDp(mBackgroundWheelArea
.getBackgroundWidth()));
labelArea = new LabelView(pContext, "Web");
mBackgroundLabelArea = new BackgroundView(pContext, R.drawable.menu_background_label);
this.addView(wheelCoreArea, 0);
}
@Override
protected void onLayout(boolean pChanged, int pL, int pT, int pR, int pB) {
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
child.layout(100, 100, 0, 0);
}
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
child.draw(canvas);
return true;
}
}
但是wheelCoreArea视图没有从左上角移动! 🙁
你能帮助我吗 ?
问候.
最佳答案 您应该重写onLayout()方法并手动设置视图边界而不是设置边距.
调用view.layout(顶部,左侧,右侧,底部);保持成员变量的边界.
如果此视图的大小也发生变化,则可能需要覆盖onMeasure方法.
编辑:
尝试此公式来计算视图放置点.
viewLeft = displayWidth()/2 - viewWidth/2;
viewTop = displayHeight()/2 - viewHeight/2;
调用view.layout(viewLeft,viewTop,viewLeft viewWidth,viewTop viewHeight);