Flutter原生交互及简单插件的开发_flutter原生插件开发
在Flutter中创建一个简单的原生插件涉及以下步骤:
- 创建一个新的Dart插件项目或者在现有的Dart项目中添加新的原生模块。
- 在iOS项目中实现需要的功能。
- 在Android项目中实现需要的功能。
- 创建一个Dart封装类以供Flutter端调用。
- 在
pubspec.yaml
中声明插件并可能发布到pub。
以下是一个简单的示例,展示如何创建一个返回设备信息的原生插件:
// dart_package/lib/device_info.dart
import 'package:flutter/services.dart';
class DeviceInfo {
static const MethodChannel _channel =
const MethodChannel('device_info');
static Future<String> get platformVersion async {
final String version = await _channel.invokeMethod('getPlatformVersion');
return version;
}
}
// pubspec.yaml
dependencies:
device_info:
path: ../path_to_your_plugin/dart_package
iOS原生部分:
// iOS/Runner/Plugins/DeviceInfoPlugin.m
#import "DeviceInfoPlugin.h"
@implementation DeviceInfoPlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
FlutterMethodChannel* channel = [FlutterMethodChannel
methodChannelWithName:@"device_info"
binaryMessenger:[registrar messenger]];
[registrar addMethodCallDelegate:[[DeviceInfoPlugin alloc] init] channel:channel];
}
- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
if ([call.method isEqualToString:@"getPlatformVersion"]) {
#define STRINGIZE(x) #x
#define VALUE_TO_STRING(x) STRINGIZE(x)
result([NSString stringWithFormat:@"%s", VALUE_TO_STRING(IOS_DEVICE_VERSION)]);
} else {
result(FlutterMethodNotImplemented);
}
}
@end
Android原生部分:
// android/src/main/java/com/example/plugin_name/DeviceInfoPlugin.java
package com.example.plugin_name;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.PluginRegistry.Registrar;
public class DeviceInfoPlugin implements MethodChannel.MethodCallHandler {
private DeviceInfoPlugin(Registrar registrar) {
this.channel = new MethodChannel(registrar.messenger(), "device_info");
channel.setMethodCallHandler(this);
}
public static void registerWith(Registrar registrar) {
new DeviceInfoPlugin(registrar);
}
@Override
public void onMethodCall(MethodCall call, MethodChannel.Result result) {
if (call.method.equals("getPlatformVersion")) {
result.success("Android " + android.os.Build.VERSION.RELEASE);
} else {
result.notImplemented();
}
}
private final MethodCh
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