安装

dependencies:
flutter_downloader: ^1.3.1

配置

Java:

// MyApplication.java
package com.example.flutter_demo; // 设置你的 import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.GeneratedPluginRegistrant; public class MyApplication extends FlutterApplication implements PluginRegistry.PluginRegistrantCallback {
@Override
public void registerWith(PluginRegistry registry) {
GeneratedPluginRegistrant.registerWith(registry);
}
}

Or Kotlin:

// MyApplication.kt
package com.example.flutter_demo // 设置你的 import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.GeneratedPluginRegistrant internal class MyApplication : FlutterApplication(), PluginRegistry.PluginRegistrantCallback {
override fun registerWith(registry: PluginRegistry) {
GeneratedPluginRegistrant.registerWith(registry)
}
}

更新AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.flutter_demo"> <!-- new -->
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<!-- new --> <!-- io.flutter.app.FlutterApplication is an android.app.Application that
calls FlutterMain.startInitialization(this); in its onCreate method.
In most cases you can leave this as-is, but you if you want to provide
additional functionality it is fine to subclass or reimplement
FlutterApplication and put your custom class here. --> <!-- 更新 android:name -->
<application
android:name=".MyApplication"
android:label="flutter_demo"
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
<!-- This keeps the window background of the activity showing
until Flutter renders its first frame. It can be removed if
there is no splash screen (such as the default splash screen
defined in @style/LaunchTheme). -->
<meta-data
android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
android:value="true" />
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity> <!-- flutter_downloader new-->
<provider
android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
android:authorities="${applicationId}.flutter_downloader.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider> <provider
android:name="androidx.work.impl.WorkManagerInitializer"
android:authorities="${applicationId}.workmanager-init"
android:enabled="false"
android:exported="false" /> <provider
android:name="vn.hunghd.flutterdownloader.FlutterDownloaderInitializer"
android:authorities="${applicationId}.flutter-downloader-init"
android:exported="false">
<!-- changes this number to configure the maximum number of concurrent tasks -->
<meta-data
android:name="vn.hunghd.flutterdownloader.MAX_CONCURRENT_TASKS"
android:value="5" />
</provider>
<!-- new -->
</application>
</manifest>

andriod 上简单的使用

// main.dart
import 'dart:io';
import 'dart:isolate';
import 'dart:ui'; import 'package:flutter/material.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart'; void main() async {
runApp(MyApp());
} class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
);
}
} class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
} class _HomePageState extends State<HomePage> {
String downloadId;
String _link = "https://i.loli.net/2019/10/18/gE3PTycd9SF5VqY.jpg";
String _localPath; ReceivePort _port = ReceivePort(); @override
void initState() {
super.initState();
_init();
} Future<void> _init() async {
await FlutterDownloader.initialize();
IsolateNameServer.registerPortWithName(
_port.sendPort, 'downloader_send_port');
_port.listen((dynamic data) {
print('UI Isolate Callback: $data');
String id = data[0];
DownloadTaskStatus status = data[1];
int progress = data[2]; print("status: $status");
print("progress: $progress");
print("id == downloadId: ${id == downloadId}");
});
FlutterDownloader.registerCallback(downloadCallback); _localPath = (await _findLocalPath()) + '/Download';
final savedDir = Directory(_localPath);
bool hasExisted = await savedDir.exists();
if (!hasExisted) {
savedDir.create();
}
} static void downloadCallback(
String id, DownloadTaskStatus status, int progress) {
print(
'Background Isolate Callback: task ($id) is in status ($status) and process ($progress)');
final SendPort send =
IsolateNameServer.lookupPortByName('downloader_send_port');
send.send([id, status, progress]);
} Future<String> _findLocalPath() async {
final directory = await getExternalStorageDirectory();
return directory.path;
} Future<bool> _checkPermission() async {
if (Theme.of(context).platform == TargetPlatform.android) {
PermissionStatus permission = await PermissionHandler()
.checkPermissionStatus(PermissionGroup.storage);
if (permission != PermissionStatus.granted) {
Map<PermissionGroup, PermissionStatus> permissions =
await PermissionHandler()
.requestPermissions([PermissionGroup.storage]);
if (permissions[PermissionGroup.storage] == PermissionStatus.granted) {
return true;
}
} else {
return true;
}
} else {
return true;
}
return false;
} @override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Home Page'),
),
body: Center(
child: Text('home page'),
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.arrow_downward),
onPressed: () async {
if (await _checkPermission()) {
final taskId = await FlutterDownloader.enqueue(
url: _link,
savedDir: _localPath,
showNotification:
true, // show download progress in status bar (for Android)
openFileFromNotification:
true, // click on notification to open downloaded file (for Android)
);
downloadId = taskId;
}
},
),
);
}
}

中文模板res/values-b+zh+ZH/strings.xml


<resources>
<string name="flutter_downloader_notification_started">下载开始</string>
<string name="flutter_downloader_notification_in_progress">正在下载</string>
<string name="flutter_downloader_notification_canceled">下载取消</string>
<string name="flutter_downloader_notification_failed">下载错误</string>
<string name="flutter_downloader_notification_complete">下载完成</string>
<string name="flutter_downloader_notification_paused">下载暂停</string>
</resources>

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