Public account: wechat search front end tool person; Take more dry goods
Original link: my blog garden article
First, opening remarks:
- At present as
flutter github startNumber has been94.4 K.This potentially illustrates the trend of App development after this event. - As a new show, it has a strong following but the community ecology is not perfect. There are also many functions that do not have plug-ins.
- I am honored to contribute to the Flutter community
Second, the steps
2.1. Create a plug-in package
Note: The Flutter plugin project uses Objective-C by default for iOS code and Java for Android code. Unless you manually change it (mine is)
flutter create --org com.example --template=plugin hello
// Change the native language
flutter create --template=plugin -i swift -a kotlin hello
/ / or
flutter create --template=plugin -i objc -a java hello
Copy the code2.2. Partial structure
- The plug-in package
Dart APIlib/hello.dart
- The plug-in package
APItheAndroidimplementationlib/hello.dart
- The plug-in package
APItheiosimplementationios/Classes/HelloPlugin.m
- One that depends on the plug-in
FlutterApplication, to explain how to use itexample/
2.3 implementationpackagepackage
Write business code (note: if you modify native code, you need to run flutter build apk so that your example can use the function you edited)
To edit Android code with Android Studio or Vscode, make sure the code has been built at least once before you write it (for example, CD to hello/example; Build APK in flutter)
- Exposed method: The directory is in the root directory
lib/hello.dart
class Flutter3desPlugin {
static const MethodChannel _channel =
const MethodChannel('hello');
static Future<String> get platformVersion async {
final String version = await _channel.invokeMethod('getPlatformVersion');
return version;
}
// Encryption method
static Future<String> encrypt(String key, String data) async{
return await _channel.invokeMethod('encrypt' , <String,dynamic>{'data':data,'key':key});
}
}
Copy the code- The directory changed by Android is
android/src/main/java/com/yourcompany/hello/HelloPlugin.javaThe inside of theonMethodCallMethod, as shown below, where the comment section is needed
@Override
public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
/ / theifGracefully change to switch and add the ENCRYPT condition, which will correspond to the name of the method you expose
switch (call.method) {
case "getPlatformVersion":
result.success("Android " + android.os.Build.VERSION.RELEASE);
break;
case "encrypt": // Method mapping
String body = call.argument("data");
String keys = call.argument("key");
String key = keys + keys.substring(0,16);
byte [] text = encrypt(hexStr2Bytes(key),hexStr2Bytes(body));
result.success(bytes2HexStr(text));
break;
default:
result.notImplemented();
break;
}
}
private static final String algorithm = "DESede";
// The implementation of the method
public static byte[] encrypt(byte[] key, byte[] body) {
try {
SecretKey deskey = new SecretKeySpec(key, algorithm);
Cipher c1 = Cipher.getInstance(algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
return c1.doFinal(body);
} catch (java.security.NoSuchAlgorithmException e1) {
e1.printStackTrace();
} catch (javax.crypto.NoSuchPaddingException e2) {
e2.printStackTrace();
} catch (java.lang.Exception e3) {
e3.printStackTrace();
}
return null;
}
. (Other methods are omitted.)
Copy the code- Ios changed the directory to
ios\Classes\hello.mIn thehandleMethodCallMethod, addencryptMethod mapping, andjavaPartially similar; The comments section needs to be added
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
FlutterMethodChannel* channel = [FlutterMethodChannel
methodChannelWithName:@"flutter_3des_plugin"
binaryMessenger:[registrar messenger]];
Flutter3desPlugin* instance = [[Flutter3desPlugin alloc] init];
[registrar addMethodCallDelegate:instance channel:channel];
}
- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
if ([@"getPlatformVersion" isEqualToString:call.method]) {
result([@"iOS " stringByAppendingString:[[UIDevice currentDevice] systemVersion]]);
} else if([@"encrypt"IsEqualToString: call method]) {/ / the method name mapping, pay attention to the method name and exposed out
NSDictionary* argsMap=call.arguments;
NSString * data=argsMap[@"data"];
NSString * key=argsMap[@"key"];
NSString *batteryLevel = [self encrypt:data key:key];
if (batteryLevel) {
result(batteryLevel);
} else
{
result([FlutterError errorWithCode:@"UNAVAILABLE"
message:@"Battery info unavailable"
details:nil]);
}
} else {
result(FlutterMethodNotImplemented);
}
}
// The implementation of business code
- (NSString *)encrypt:(NSString *)data key:(NSString *)key {
JKEncrypt * en = [[JKEncrypt alloc]init];
/ / encryption
NSString * encryptStr = [en encrypt3DesData:data key:key];
return encryptStr;
}
@end
Copy the code2.4. Then run the test your code
Note: you don’t need to distinguish between android and ios, the framework will automatically distinguish, you just need to write native code, example\lib\main.dart
import 'package:flutter_3des_plugin/flutter_3des_plugin.dart';
@override
void initState() {
super.initState();
encrypt();
}
/ / 3 des encryption
encrypt () {
Flutter3desPlugin.encrypt(_key, _data).then((res) {
// TODO: res is encrypted data
setState(() {
_result = res;
});
});
}
Copy the codePublish package to pub.dev
- Before Posting, check
Yaml, readme. md, and Changelog. md filesTo ensure the integrity and correctness of its content - And in the root directory
pubspec.yamlAt the top of the fileVersion, the author, the homepageAnd so on, execute the following command will be prompted; Success prompt: after executing the second command and authorizing Google login:Successfully uploaded package.
Flutter packages pub publish --dry-run --server=https://pub.dartlang.org;
Flutter packages pub publish; Or flutter packages pub publish;
Copy the codeFive, possible problems
If the fourth walk is ok, you don’t have to look down. Next comes the release pit (pit of my physical and mental exhaustion) now summarizes the method
5.1. Let’s look at the errors:
// Error 1, stuck, desperate..... See these report error I all.....
Waiting for your authorization...
Authorization received, processing...
It looks like accounts.google.com is having some trouble.
Pub will wait for a while before trying to connect again.
OS Error: Operation timed out, errno = 60, address = accounts.google.com, port = 53481
pub finished with exit code 69
Copy the code// Error # 2, it is stuck
Package has 2 warnings. Upload anyway (y/n)? y
Uploading...
Copy the code5.2. The solution; Regardless of what kind of error is reported, follow the steps below to execute the command
Step 1
- Using the command line (
git,cmdOpen your project root directory and run the following command - Objective: To remove the domestic mirror; Note: the following command is only valid on the current terminal port, you run it in another window will reset.
unset FLUTTER_STORAGE_BASE_URL
unset PUB_HOSTED_URL
Copy the code2. Set the local proxy
// The default Windows port number is 1080. Unless you change, the MAC port number is 1081
setHttp_proxy = http://127.0.0.1:1080
setHttps_proxy = http://127.0.0.1:1080
// Replace the top with the bottom
exportHttp_proxy = http://127.0.0.1:1080
exportHttps_proxy = http://127.0.0.1:1080
Copy the code3. Step 3 Set the terminal agent
- In this case you need a foreign server…….. (Awkward, 1,001 years cheap);
- Then download the small plane (
Shadowocks.exe). Add your server, system agent mode to global mode **
Step 4
- Test your terminal agent setup successfully
- Enter from the command line of the previous installments
curl -vv http://www.google.comAnd check whether you can access Google.
Step 5
ping通googleAfter executing the send packet command, you should see the following, indicating success:- At this time to
pub.devSearch your plugin and you’ll find it.
Package has 2 warnings. Upload anyway (y/n)? y
Uploading...
Successfully uploaded package.
Copy the code