LayoutInflater 的inflate(int resource, ViewGroup root, boolean attachToRoot)方法研究

最新推荐文章于 2019-03-21 21:05:01 发布

原创最新推荐文章于 2019-03-21 21:05:01 发布 · 1.2k 阅读

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本文详细解析了视图处理流程的三种情况，包括root为空、root不为空且不附加到root、root不为空且附加到root的具体实现逻辑。

情况一： root =null, attachToRoot = false;

View temp = createViewFromTag(root, name, attrs);

// Inflate all children under temp
rInflate(parser, temp, attrs, true);

return temp;

情况二：root != null, attachToRoot = false;

View temp = createViewFromTag(root, name, attrs);

ViewGroup.LayoutParams params = root.generateLayoutParams(attrs);
temp.setLayoutParams(params);

// Inflate all children under temp
rInflate(parser, temp, attrs, true);

return temp;

情况三：root != null, attachToRoot = true;

View temp = createViewFromTag(root, name, attrs);

ViewGroup.LayoutParams params = root.generateLayoutParams(attrs);
temp.setLayoutParams(params);

// Inflate all children under temp
rInflate(parser, temp, attrs, true);

root.addView(temp, params);

return root;

总结：

root为空时，返回temp。

root 不为空时， attachToRoot = true 。返回root；

attachToRoot = false。设置temp layoutParams 。返回temp。