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fix example/main + provide tip on permission crash
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@flutter-painter
flutter-painter committed Sep 18, 2022
1 parent 0c2561c commit 654c42e
Showing 1 changed file with 76 additions and 75 deletions.
151 changes: 76 additions & 75 deletions example/lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,19 @@ class _MyAppState extends State<MyApp> {
}

Future<void> initPlatformState() async {
// TODO here add a permission request using permission_handler
// if permission is not granted, kzaki's thermal print plugin will ask for location permission
// which will invariably crash the app even if user agrees so we'd better ask it upfront

// var statusLocation = Permission.location;
// if (await statusLocation.isGranted != true) {
// await Permission.location.request();
// }
// if (await statusLocation.isGranted) {
// ...
// } else {
// showDialogSayingThatThisPermissionIsRequired());
// }
bool? isConnected = await bluetooth.isConnected;
List<BluetoothDevice> devices = [];
try {
Expand Down Expand Up @@ -107,82 +120,72 @@ class _MyAppState extends State<MyApp> {
appBar: AppBar(
title: Text('Blue Thermal Printer'),
),
body: Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: ListView(
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
SizedBox(
width: 10,
),
Text(
'Device:',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
SizedBox(
width: 30,
),
Expanded(
child: DropdownButton(
items: _getDeviceItems(),
onChanged: (BluetoothDevice? value) =>
setState(() => _device = value),
value: _device,
),
),
],
),
SizedBox(
height: 10,
),
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
ElevatedButton(
style: ElevatedButton.styleFrom(primary: Colors.brown),
onPressed: () {
initPlatformState();
},
child: Text(
'Refresh',
style: TextStyle(color: Colors.white),
),
),
SizedBox(
width: 20,
body: Padding(
padding: const EdgeInsets.all(8.0),
child: ListView(
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
const SizedBox(width: 10),
const Text(
'Device:',
style: TextStyle(
fontWeight: FontWeight.bold,
),
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: _connected ? Colors.red : Colors.green),
onPressed: _connected ? _disconnect : _connect,
child: Text(
_connected ? 'Disconnect' : 'Connect',
style: TextStyle(color: Colors.white),
),
),
const SizedBox(width: 30),
Expanded(
child: DropdownButton(
items: _getDeviceItems(),
onChanged: (BluetoothDevice? value) =>
setState(() => _device = value),
value: _device,
),
],
),
Padding(
padding:
const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
child: ElevatedButton(
),
],
),
const SizedBox(height: 10),
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
ElevatedButton(
style: ElevatedButton.styleFrom(primary: Colors.brown),
onPressed: () {
testPrint.sample();
initPlatformState();
},
child: Text('PRINT TEST',
style: TextStyle(color: Colors.white)),
child: const Text(
'Refresh',
style: TextStyle(color: Colors.white),
),
),
const SizedBox(width: 20),
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: _connected ? Colors.red : Colors.green),
onPressed: _connected ? _disconnect : _connect,
child: Text(
_connected ? 'Disconnect' : 'Connect',
style: TextStyle(color: Colors.white),
),
),
],
),
Padding(
padding:
const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
child: ElevatedButton(
style: ElevatedButton.styleFrom(primary: Colors.brown),
onPressed: () {
testPrint.sample();
},
child: const Text('PRINT TEST',
style: TextStyle(color: Colors.white)),
),
],
),
),
],
),
),
),
Expand All @@ -209,7 +212,7 @@ class _MyAppState extends State<MyApp> {
void _connect() {
if (_device != null) {
bluetooth.isConnected.then((isConnected) {
if (isConnected == true) {
if (isConnected == false) {
bluetooth.connect(_device!).catchError((error) {
setState(() => _connected = false);
});
Expand All @@ -232,12 +235,10 @@ class _MyAppState extends State<MyApp> {
}) async {
await new Future.delayed(new Duration(milliseconds: 100));
ScaffoldMessenger.of(context).showSnackBar(
new SnackBar(
content: new Text(
SnackBar(
content: Text(
message,
style: new TextStyle(
color: Colors.white,
),
style: const TextStyle(color: Colors.white),
),
duration: duration,
),
Expand Down

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