我正在尝试使用import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:io';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
DatabaseClient _db = new DatabaseClient();
int number;
List listCategory;
List<Widget> tiles;
List colors = [
const Color(0xFFFFA500),
const Color(0xFF279605),
const Color(0xFF005959)
];
createdb() async {
await _db.create().then(
(data){
_db.countCategory().then((list){
setState(() {
this.number = list[0][0]['COUNT(*)']; //3
this.listCategory = list[1];
//[{name: foo1, color: 0}, {name: foo2, color: 1}, {name: foo3, color: 2}]
});
});
}
);
}
@override
void initState() {
super.initState();
createdb();
}
void showCategoryDialog<T>({ BuildContext context, Widget child }) {
showDialog<T>(
context: context,
child: child,
)
.then<Null>((T value) {
if (value != null) {
setState(() { print(value); });
}
});
}
@override
Widget build(BuildContext context) {
List<Widget> buildTile(int counter) {
this.tiles = [];
for(var i = 0; i < counter; i++) {
this.tiles.add(
new DialogItem(
icon: Icons.brightness_1,
color: this.colors[
this.listCategory[i]['color']
],
text: this.listCategory[i]['name'],
onPressed: () {
Navigator.pop(context, this.listCategory[i]['name']);
}
)
);
}
return this.tiles;
}
return new Scaffold(
appBar: new AppBar(),
body: new Center(
child: new RaisedButton(
onPressed: (){
showCategoryDialog<String>(
context: context,
child: new SimpleDialog(
title: const Text('Categories'),
children: buildTile(this.number)
)
);
},
child: new Text("ListButton"),
)
),
);
}
}
//Creating Database with some data and two queries
class DatabaseClient {
Database db;
Future create() async {
Directory path = await getApplicationDocumentsDirectory();
String dbPath = join(path.path, "database.db");
db = await openDatabase(dbPath, version: 1, onCreate: this._create);
}
Future _create(Database db, int version) async {
await db.execute("""
CREATE TABLE category (
id INTEGER PRIMARY KEY,
name TEXT NOT NULL,
color INTEGER NOT NULL
)""");
await db.rawInsert("INSERT INTO category (name, color) VALUES ('foo1', 0)");
await db.rawInsert("INSERT INTO category (name, color) VALUES ('foo2', 1)");
await db.rawInsert("INSERT INTO category (name, color) VALUES ('foo3', 2)");
}
Future countCategory() async {
Directory path = await getApplicationDocumentsDirectory();
String dbPath = join(path.path, "database.db");
Database db = await openDatabase(dbPath);
var count = await db.rawQuery("SELECT COUNT(*) FROM category");
List list = await db.rawQuery('SELECT name, color FROM category');
await db.close();
return [count, list];
}
}
//Class of Dialog Item
class DialogItem extends StatelessWidget {
DialogItem({
Key key,
this.icon,
this.size,
this.color,
this.text,
this.onPressed }) : super(key: key);
final IconData icon;
double size = 36.0;
final Color color;
final String text;
final VoidCallback onPressed;
@override
Widget build(BuildContext context) {
return new SimpleDialogOption(
onPressed: onPressed,
child: new Container(
child: new Row(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
new Container(
child: new Container(
margin: size == 16.0 ? new EdgeInsets.only(left: 7.0) : null,
child: new Icon(icon, size: size, color: color),
)
),
new Padding(
padding: size == 16.0 ?
const EdgeInsets.only(left: 17.0) :
const EdgeInsets.only(left: 16.0),
child: new Text(text),
),
],
),
)
);
}
}
在Android Studio中为我的应用设置闹钟。但是，运行Kotlin不起作用，alarmManager.setRepeating(...)返回null。我发现当我尝试检查alarmManager.nextAlarmClock权限时，我得到SET_ALARM（ - 1），即使我已在清单中指定使用它。 PERMISSION_DENIED将无法打开警报，因此用户无法授予权限。如何让我的应用允许ActivityCompat.requestPermission？代码如下：
SET_ALARM和Manifest：
val permissionCheck = ContextCompat.checkSelfPermission(this, android.Manifest.permission.SET_ALARM)
if(permissionCheck != PackageManager.PERMISSION_GRANTED) {
Log.d("Notification", "Permission not granted earlier, permission: $permissionCheck")
ActivityCompat.requestPermissions(this, arrayOf<String>(android.Manifest.permission.SET_ALARM),1)
} else {
Log.d("Notification", "Permission was already granted")
}
val calendar = Calendar.getInstance()
calendar.set(Calendar.HOUR_OF_DAY, hour)
calendar.set(Calendar.MINUTE, minute)
calendar.set(Calendar.SECOND, 0)
val intent = Intent(this, NotificationReceiver::class.java)
val pendingIntent = PendingIntent.getBroadcast(this,Values.ALARM_REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)
val alarmManager = this.getSystemService(Context.ALARM_SERVICE) as AlarmManager
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, AlarmManager.INTERVAL_DAY, pendingIntent)
Log.d("Norif", "Notifications set: ${alarmManager.nextAlarmClock}")