求大神指点，问题出在哪里

一般是activity没找到，或者里面的控件有问题，丢出了null。

lz你的程序有空指针错误。查看一下你的对象

一般你这种情况最大的可能就是没有注册Activity，还有就是控件使用了但是没有声明出来。

信息有点少，比较判断。可能是出错是在MainActivity里面，在启动的时候发生了空指针异常，这个情况一般是没有注册Activity或者布局文件有错。

看了几遍ViewGroup里的addViewInner。看来看去，最有可能空指针的是child，也就是你addView(view)传入的view是空指针，你查查看。附上源码：
private void addViewInner(View child, int index, LayoutParams params,
boolean preventRequestLayout) {

    if (mTransition != null) {
        // Don't prevent other add transitions from completing, but cancel remove
        // transitions to let them complete the process before we add to the container
        mTransition.cancel(LayoutTransition.DISAPPEARING);
    }

    if (child.getParent() != null) {
        throw new IllegalStateException("The specified child already has a parent. " +
                "You must call removeView() on the child's parent first.");
    }

    if (mTransition != null) {
        mTransition.addChild(this, child);
    }

    if (!checkLayoutParams(params)) {
        params = generateLayoutParams(params);
    }

    if (preventRequestLayout) {
        child.mLayoutParams = params;
    } else {
        child.setLayoutParams(params);
    }

    if (index < 0) {
        index = mChildrenCount;
    }

    addInArray(child, index);

    // tell our children
    if (preventRequestLayout) {
        child.assignParent(this);
    } else {
        child.mParent = this;
    }

    if (child.hasFocus()) {
        requestChildFocus(child, child.findFocus());
    }

    AttachInfo ai = mAttachInfo;
    if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) {
        boolean lastKeepOn = ai.mKeepScreenOn;
        ai.mKeepScreenOn = false;
        child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK));
        if (ai.mKeepScreenOn) {
            needGlobalAttributesUpdate(true);
        }
        ai.mKeepScreenOn = lastKeepOn;
    }

    if (child.isLayoutDirectionInherited()) {
        child.resetRtlProperties();
    }

    onViewAdded(child);

    if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) {
        mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE;
    }

    if (child.hasTransientState()) {
        childHasTransientStateChanged(child, true);
    }
}

activity没找到或控件有问题

activity没有找到…

非常感谢大家！问题已经解决

此处空指针了