text
stringlengths 1
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|
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v? v; |
} |
<code_end> |
<topic_end> |
<topic_start> |
native code |
if you’ve changed native code (such as kotlin, java, swift, |
or Objective-C), you must perform a full restart (stop and |
restart the app) to see the changes take effect. |
<topic_end> |
<topic_start> |
previous state is combined with new code |
flutter’s stateful hot reload preserves the state of your app. |
this approach enables you to view the effect of the most |
recent change only, without throwing away the current state. |
for example, if your app requires a user to log in, |
you can modify and hot reload a page several levels down in |
the navigation hierarchy, without re-entering your login credentials. |
state is kept, which is usually the desired behavior. |
if code changes affect the state of your app (or its dependencies), |
the data your app has to work with might not be fully consistent |
with the data it would have if it executed from scratch. |
the result might be different behavior after a hot reload |
versus a hot restart. |
<topic_end> |
<topic_start> |
recent code change is included but app state is excluded |
in dart, static fields are lazily initialized. |
this means that the first time you run a flutter app and a |
static field is read, it’s set to whatever value its |
initializer was evaluated to. |
global variables and static fields are treated as state, |
and are therefore not reinitialized during hot reload. |
if you change initializers of global variables and static fields, |
a hot restart or restart the state where the initializers are hold |
is necessary to see the changes. |
for example, consider the following code: |
<code_start> |
final sampleTable = [ |
table( |
children: const [ |
TableRow( |
children: [text('t1')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t2')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t3')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t4')], |
) |
], |
), |
]; |
<code_end> |
after running the app, you make the following change: |
<code_start> |
final sampleTable = [ |
table( |
children: const [ |
TableRow( |
children: [text('t1')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t2')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t3')], |
) |
], |
), |
table( |
children: const [ |
TableRow( |
children: [text('t10')], // modified |
) |
], |
), |
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