Flutter Dev Tools

Question 1

identifying and resolving errors/bugs in software

Answer 1

debugging

Question 2

type of error caused by incorrect program flow, semantic errors, and flawed logic

Answer 2

logical error

Question 3

possible fix for logical error

Answer 3

look at requirements

Question 4

type of error that is often caused by unexpected data, null values, out-of-bounds access, or issues with external resources

Answer 4

runtime errors

Question 5

possible strategies to debug runtime errors (2)

Answer 5

1. read the debug information
2. use try-catch

Question 6

examples of runtime errors (3)

Answer 6

1. NullPointerException
2. NoSuchMethod
3. FileNotFoundException

Question 7

type of error caused by a broken layout

Answer 7

rendering issues

Question 8

possible strategies to debug rendering issues (3)

Answer 8

1. flutter inspector
2. read the widget properties and documentation
3. use “show guidelines” and “highlight repaints” tool

Question 9

example of rendering issues (2)

Answer 9

1. layout overflow
2. incorrect widget placement

Question 10

type of error which causes the program to run unexpectedly slow but not crash

Answer 10

performance problems

Question 11

possible strategies to fix performance problems (3)

Answer 11

1. app profiling
2. use flutter dev tools
3. read the flutter dev tools results

Question 12

type of error caused by problems interacting with external APIs, services, and databases

Answer 12

integration errors

Question 13

possible strategies to fix integration errors (3)

Answer 13

1. use flutter dev tools (network)
2. read the external service’s documentation
3. testing api endpoints independently

Question 14

flutter dev tool that shows the device info, sdk info, and emulator info

Answer 14

summary

Question 15

flutter dev tool that shows the tree view and details of every widget

Answer 15

widget inspector

Question 16

flutter dev tools that provide additional visualizations to help you analyze your layout (3)

Answer 16

1. show guidelines
2. show baselines
3. highlight repaints

Question 17

flutter dev tool that combines key metrics and visualizations from the timeline and CPU profiler

Answer 17

performance profiler

Question 18

flutter dev tool that shows CPU use analysis and identifies expensive functions

Answer 18

cpu profiler

Question 19

flutter dev tool that shows memory usage analysis, identifies memory leaks, and garbage collection analysis

Answer 19

memory analyser

Question 20

flutter dev tool that shows http requests

Answer 20

network analyser

Question 21

flutter dev tool that shows the log of events that occurred in the app

Answer 21

logging

Question 22

flutter dev tool that shows package specific information

Answer 22

package specific

Question 23

flutter dev tools are for (5)

Answer 23

1. for deeper understanding
2. efficient debugging
3. performance optimization
4. ui inspection
5. network analysis