Android performance optimization-Cold start optimization (application)

One, application (single global Only one, life cycle equivalent to the life cycle of the app)

1. Initializing global object, environment variable configuration (onCreate)

2. Get the current memory usage of the application (memory optimized)

Onlowmemory: Callback when memory is low

Ontrimmemory: Resource release based on memory usage

3. Monitor the lifecycle of all activity within the application (Activitylifecyclecallback)

4. Monitoring application configuration information Change (onconfigurationchanged)

Second, cold start (no process to have process) time calculation

Starting point: OnCreate method of Application

End point: Home activity OnCreate Method loading complete

Three, cold START process

Application constructor Method--attachbasecontext--oncreate--activity construction method--oncreate--The background of the configuration body and other properties--onstart--onresume--measurement layout drawing is displayed on the interface

Four, cold start optimization

Reduced OnCreate method Effort (lazy loading, reload when used)

Do not let application participate in business operations

Do not take a time-consuming operation in application

Do not save data in application as a static variable (memory leak, data security)

Layout/mainthread

Android performance optimization-Cold start optimization (application)