text
stringlengths 1
372
|
|---|
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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