java.lang.NullPointerException
at com.administrator_example.icm_arcmenu.view.ArcMenu.layoutButton(ArcMenu.java:137) 这句：mCButton.setOnClickListener(this);
at com.administrator_example.icm_arcmenu.view.ArcMenu.onLayout(ArcMenu.java:129)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:502)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1717)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1571)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1480)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
at android.view.View.layout(View.java:14841)
at android.view.ViewGroup.layout(ViewGroup.java:4631)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1986)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1743)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5603)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
at dalvik.system.NativeStart.main(Native Method)
private void layoutButton() {
mCButton = getChildAt(0);
mCButton.setOnClickListener(this);
int l = 0;//子布局左边界与父布局左边界的距离
int t = 0;//子布局上边界与上边界的距离 r:子布局右边界与父布局左边界的距离 b：子布下边界与父布局上边界
int width = mCButton.getMeasuredWidth(); //子布局宽度
int height = mCButton.getMeasuredHeight();
switch (mpostion) {
case LEFT_TOP:
l = 0;
t = 0;
break;
case LEFT_BOTTOM:
l=0;
t=getMeasuredHeight()-height;
break;
case RIGHT_TOP:
l = getMeasuredWidth()-width;
t = 0;
break;
case RIGHT_BOTTOM:
l = getMeasuredWidth()-width;
t = getMeasuredHeight()-height;
break;
}
mCButton.layout(l,t,l+width,t+height);
