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java - 如何从 flutter 中正确调用 android native 代码(包括 android/IOS)?

转载 作者:行者123 更新时间:2023-12-05 00:05:22 27 4
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我是 Flutter 的初学者。老实说不知道 Android Studio。我的目标是实现本地(系统)身份验证。所以得到了 local_auth 插件,它只给你一个指纹选项。如果用户没有指纹硬件怎么办?所以我打算通过从flutter中调用本地代码(Android)来实现这个东西。但问题是我无法正确验证用户身份。例如,在进行身份验证时,响应来自 native 代码。在进行身份验证之前,我无法暂停该功能的执行。尝试同步方法但仍然没有运气。

我的 Dart 代码:

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(Container(
child: Row(
children: <Widget>[
Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: Center(child: MyApp()),
),
],
),
],
),
));

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(

primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}

class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;

@override
_MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;

void _incrementCounter() {
// setState(() {
// // This call to setState tells the Flutter framework that something has
// // changed in this State, which causes it to rerun the build method below
// // so that the display can reflect the updated values. If we changed
// // _counter without calling setState(), then the build method would not be
// // called again, and so nothing would appear to happen.
// _counter++;
// });
// my_count();
// var cc = code().toString();
// print(cc);
// if(cc == "200") {
// Navigator.push(
// context,
// MaterialPageRoute(builder: (context) => SecondRoute()),
// );
// }else if( cc == "333") {
// Navigator.push(context,
// MaterialPageRoute(
// builder: (context) => ThirdRoute()
// ));
// }
code();

}

@override
void initState() {
// TODO: implement initState
super.initState();
my_count();
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
static const paltform = const MethodChannel('lock');

// ignore: missing_return
void code() async {
int ii;
try {
ii = await paltform.invokeMethod('value');
} catch (e){
print(e);
}
// print(ii);
// return ii;
if(ii == 200) {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
}else if( ii == 333) {
Navigator.push(context,
MaterialPageRoute(
builder: (context) => ThirdRoute()
));
}
}

// ignore: non_constant_identifier_names
void my_count() async {
try{
_counter = await paltform.invokeMethod('getCounter');
}catch(e){
print(e);
}
}
//if i call code() here it not executing
code();
}



class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Route"),
),
body: Center(
child: RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}

class ThirdRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Third Route"),
),
body: Center(
child: RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}

我正在做的是从 flutter 调用原生代码并从原生端获取响应代码基于该路由页面这是我的 Android 代码:

package com.example.native_3;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;

import android.app.KeyguardManager;
import android.content.Intent;
import android.os.Build;

public class MainActivity extends FlutterActivity {

private static final int LOCK_REQUEST_CODE = 221;
private static final int SECURITY_SETTING_REQUEST_CODE = 233;
int code = 0;
private static final String CHANNEL = "lock";

@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
.setMethodCallHandler(
(call, result) -> {
// Note: this method is invoked on the main thread.
if (call.method.equals("getCounter")) {
synchronized (this) {
authenticateApp();
}
int batteryLevel = 0;


if (batteryLevel >= 0) {
result.success(batteryLevel);
} else {
result.error("UNAVAILABLE", "Battery level not available.", null);
}
} else if (call.method.equals("value")) {
result.success(get());
}
else {
result.notImplemented();
}
}
);
}

private int get() {
return code;
}

private synchronized void authenticateApp() {
//Get the instance of KeyGuardManager
KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);

//Check if the device version is greater than or equal to Lollipop(21)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
//Create an intent to open device screen lock screen to authenticate
//Pass the Screen Lock screen Title and Description
Intent i = keyguardManager.createConfirmDeviceCredentialIntent("unlock", "to unlock");
try {
//Start activity for result
startActivityForResult(i, LOCK_REQUEST_CODE);

} catch (Exception e) {

// //If some exception occurs means Screen lock is not set up please set screen lock
// //Open Security screen directly to enable patter lock
// Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
// try {
//
// //Start activity for result
// startActivityForResult(intent, SECURITY_SETTING_REQUEST_CODE);
// } catch (Exception ex) {
//
// //If app is unable to find any Security settings then user has to set screen lock manually
// textView.setText(getResources().getString(R.string.setting_label));
// }
}
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// super.onActivityResult(requestCode, resultCode, data);
synchronized (this) {
switch (requestCode) {
case LOCK_REQUEST_CODE:
if (resultCode == RESULT_OK) {
//If screen lock authentication is success update text
code = 200;
} else {
//If screen lock authentication is failed update text
code = 333;
}
break;
case SECURITY_SETTING_REQUEST_CODE:
//When user is enabled Security settings then we don't get any kind of RESULT_OK
//So we need to check whether device has enabled screen lock or not
if (isDeviceSecure()) {
//If screen lock enabled show toast and start intent to authenticate user
code = 444;
} else {
//If screen lock is not enabled just update text

code = 555;
}

break;
}
}
}
private boolean isDeviceSecure() {
KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);

//this method only work whose api level is greater than or equal to Jelly_Bean (16)
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN && keyguardManager.isKeyguardSecure();

//You can also use keyguardManager.isDeviceSecure(); but it requires API Level 23

}

}

运行它们后,只有在按下按钮后我才会得到成功的响应。但我希望它应该根据本地代码的响应相应地路由自己

最佳答案

local_auth还允许 pin、模式或密码身份验证。您可以使用 auth.getAvailableBiometrics() 获取设备的可用生物识别身份验证列表。

关于java - 如何从 flutter 中正确调用 android native 代码(包括 android/IOS)?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59895787/

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