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ANR occurs during the use of the app. This is a painful phenomenon. The app freezes, black screen appears, etc.
1. Optimization direction
- The direction is the goal: fast, stable, economical and small.
- The main problems to be solved: Stuck, unreasonable memory usage, poor code quality, messy code logic, and too large installation package, these are the most common problems encountered during the development process.
- analysis of idea
1、
2. Implement optimization
1. Go to Caton
- UI freeze
- reason
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-----主要以下两点-----
- 1、绘制任务太重，绘制一帧内容耗时太长
- 2、主线程太忙， 主线程做了太多的事情，或有耗时动作。
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Main thread responsibilities: interface life cycle control, system event processing, message processing, interface layout, interface drawing, interface refresh.
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The cooperation between the human eye and the brain cannot perceive the picture update exceeding 60fps;
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The performance standard of the App is to guarantee the value of 60fps, which means that each frame only takes 1000/60 = 16ms;
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The interface will be stuck and not smooth, because the current UI processing of this interface exceeds 16ms, and it will take up the next 16ms, so that 16ms * 2 are all displayed in the same frame, which is what I see as "stuck".
- tool
Hierarchy Viewer工具 \
- Solutions
- am start -W com.nwd.can.setting/com.nwd.can.setting.ui.MainActivity
- Start lag
- Jump stuck
- Response lag
2. Keep stable
| problematic item | reference URL |
|---|---|
| memory leak, memory overflow | Reference knowledge points |
- out of memory
Memory overflow: (out of memory) The common understanding is that the memory is not enough oom, usually when running large-scale software or games, the memory required by the software or games far exceeds the capacity of the memory installed in your host , which is called memory overflow.
- Memory Leak
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Memory leak: (Memory Leak) refers to the heap memory that has been dynamically allocated in the program is not released or cannot be released for some reason, resulting in a waste of system memory, resulting in serious consequences such as slowing down the running speed of the program and even system crashes.
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The consequences of memory leak accumulation are very serious, no matter how much memory, it will be taken up sooner or later.
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Case 1
- crash
3. Save power and flow
4. Installation package size
