Flutter 与 原生交互（Android），2021 年 BATJ30 套大厂 Android 经典高频面试题
/**
接收
*/
void receiveMessage(){
messageChannel.setMessageHandler((message) async{
print(message);
return "is ok";
});
}
MethodChannel
=============
flutter 调用 原生
1.实现插件
public class FlutterPluginTest implements MethodChannel.MethodCallHandler {
private static final String TAG = "FlutterPluginTest";
/**
插件标识
*/
public static String CHANNEL = "com.mmd.flutterapp/plugin";
private static String ACTION_LOG = "log";
private static String LOG_ARGUMENT = "data";
static MethodChannel channel;
public static void registerWith(PluginRegistry.Registrar registrar) {
channel = new MethodChannel(registrar.messenger(), CHANNEL);
FlutterPluginTest instance = new FlutterPluginTest();
channel.setMethodCallHandler(instance);
}
@Override
public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
/**
通过 method 判断调用方法
*/
if (methodCall.method.equals(ACTION_LOG)) {
/**
解析参数
*/
String text = methodCall.argument(LOG_ARGUMENT);
if (TextUtils.isEmpty(text)) {
/**
错误返回
*/
result.error("Data is Null",null,null);
}else {
Log.d(TAG, "onMethodCall: "+text);
/**
成功返回
*/
result.success("is ok");
}
}else {
result.notImplemented();
}
}
}
2.注册插件
public class MainActivity extends FlutterActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
注册插件
*/
FlutterPluginTest.registerWith(this.registrarFor(FlutterPluginTest.CHANNEL));
}
}
3.Flutter 端调用
import 'package:flutter/services.dart';
/**
名称要和 Java 端一致
*/
const channelName = "com.mmd.flutterapp/plugin";
const methodName = "log";
const MethodChannel channel = MethodChannel(channelName);
Future<String> _testLog() async{
Map<String,String> map = {"data":"Flutter Hello !"};
String result = await channel.invokeMethod(methodName,map);
print(result);
}
EventChannel
============
原生发送数据到 Flutter
1.实现插件
public class FlutterPluginEventTest implements EventChannel.StreamHandler {
private static final String TAG = "FlutterPluginEventTest";
public static String CHANNEL = "com.mmd.flutterapp/plugin";
static EventChannel channel;
public static void registerWith(PluginRegistry.Registrar registrar) {
channel = new EventChannel(registrar.messenger(), CHANNEL);
FlutterPluginEventTest flutterPluginEventTest = new FlutterPluginEventTest();
channel
《Android 学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
【docs.qq.com/doc/DSkNLaERkbnFoS0ZF】 完整内容开源分享
.setStreamHandler(flutterPluginEventTest);
}
@Override
public void onListen(Object o, EventChannel.EventSink eventSink) {
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(1000);
eventSink.success(System.currentTimeMillis());
} catch (InterruptedException e) {
eventSink.error("error","error",e.getMessage());
}
}
}
}).start();
}
@Override
public void onCancel(Object o) {
Log.i(TAG, "onCancel: "+o);
}
}
2.注册插件
FlutterPluginEventTest.registerWith(this.registrarFor(FlutterPluginEventTest.CHANNEL));
3.Flutter 接收
import 'dart:async';
import 'package:flutter/services.dart';
/**
名称要和 Java 端一致
*/
const channelName = "com.mmd.flutterapp/plugin";
const EventChannel eventChannel = EventChannel(channelName);
StreamSubscription _subcription = null;
void init(void onEvent(String value),Function onError){
if(_subcription == null) {
_subcription = eventChannel.receiveBroadcastStream().listen(onEvent,onError: onError);
}
}
最后送福利了，现在关注我可以获取包含源码解析，自定义 View，动画实现，架构分享等。内容难度适中，篇幅精炼，每天只需花上十几分钟阅读即可。大家可以跟我一起探讨，有 flutter—底层开发—性能优化—移动架构—资深 UI 工程师 —NDK 相关专业人员和视频教学资料，还有更多面试题等你来拿
还未添加个人签名 2021.03.19 加入
还未添加个人简介
评论