_android layout optimization of performance optimization

The principle of optimizing the layout is to reduce the number of objects created, Setcontentview the OnCreate to Onresume about 99% of the time
1. Using relativelayout instead of linearlayout,linearlayout will result in an increase in the number of nesting levels and linearlayout itself (LinearLayout does not play any role, just to locate)
2. Use <merge> instead of framelayout because the activity's parent view is a framelayout, so using <merge> can reduce one layer of layout container controls
3. Use <include> to reuse layouts, or adjust layout transitions when switching between screens
4. Use viewstub placeholder, defer instantiation, run inflate this viewstub
5. Using Tools Hierarchyviewer and Layoutopt

_android layout optimization of performance optimization