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https://lazy-assedninja.comA collection of development notes and guides by Android Developer Henry Huang. Topics include Android development standards and ADB commands, GCP Nginx reverse proxy setup, Django Line Bot integration, Ktor development notes, and GitHub profile optimization. Also contains deprecated documentation for the WhatToEat project, including API, DB, and requirement specifications.
Use underscore naming and the pattern {module_}logicalName for strings to group related strings together.
Examples:
main_menu_about: About text in main menufriend_dialog_del: Delete prompt in friend modulebutton_ok: Generic OK button textUserAccount, Store, Reservation, and SystemLog.Store table contains detailed information about dining establishments, including Google Place IDs, coordinates, and relationships to categories and tags.-- Store Table
id: int(pk)
place_id: varchar(50) -- Google Place ID
name: varchar(50)
address: varchar(50)
phone: varchar(30)
picture: varchar(200)
favorite: WhatToEatUserAccount(m2m) -- Users who favorited this store
classify: Classify(m2m) -- Categories
tag: Tag(fk) -- Tag
latitude: varchar(30)
longitude: varchar(30)
star: float(0) -- Rating
website: varchar(300)
create_date: datetime
modify_date: datetimeWhatToEat is a multi-functional application designed to help users find dining options based on their preferences. Key features include:
Adhere to these architectural and performance guidelines:
<merge>, <ViewStub>, and <include> tags to optimize layouts.BaseActivity and BaseFragment to handle repetitive operations.DataManager class) to encapsulate HTTP, preferences, event posts, and database operations.Dagger2 for dependency injection to reduce coupling and boilerplate.RxAndroid to simplify logic and event buses (e.g., EventBus, RxBus) to reduce callbacks between DataLayer and ViewLayer.try...catch inside loops; place it at the outermost level.HashMap, ArrayList, and StringBuilder over HashTable, Vector, and StringBuffer unless thread safety is explicitly required.// Recommended: Cache list size to avoid repeated calculation
for (int i = 0, len = list.size(); i < len; i++) {
...
}Methods must use lowerCamelCase and typically start with a verb. Common prefixes include:
initXX(): Initialization methodsisXX(), checkXX(): Methods returning a booleangetXX(): Getter methodssetXX(): Setter methodshandleXX(), processXX(): Data processing methodsdisplayXX(), showXX(): Methods that show UI prompts or informationupdateXX(): Data update methodssaveXX(), insertXX(): Data persistence methodsresetXX(): Data reset methodsclearXX(): Data clearing methodsremoveXX(), deleteXX(): Removing data or viewsdrawXX(): Drawing data or effectsTo receive events from LINE, you need to implement a webhook endpoint in Django. This requires the line-bot-sdk package and credentials (Channel Access Token and Channel Secret) from the LINE Developers Console.
Requirements:
pip install line-bot-sdkngrok are recommended to provide a public HTTPS URL.# views.py
from django.http import HttpResponse
from linebot import LineBotApi, WebhookHandler
from linebot.exceptions import LineBotApiError
# Initialize SDK
line_bot_api = LineBotApi('YOUR_CHANNEL_ACCESS_LONG_TOKEN')
web_hook_handler = WebhookHandler('YOUR_CHANNEL_SECRET')
def webhook(request):
try:
# LINE sends a signature in the headers to verify the request
signature = request.headers['X-Line-Signature']
body = request.body.decode()
web_hook_handler.handle(body, signature)
except LineBotApiError as e:
print(str(e))
return HttpResponse("Success.") # LINE requires a successful status code to verify the webhook# urls.py
from django.urls import path
from . import views
urlpatterns = [
path('LineBot/Webhook', views.webhook, name='line_bot_webhook'),
]kotlinx.serialization, Gson, and Jackson. kotlinx.serialization is recommended for its wide format support and simplicity. To use it, annotate data classes with @Serializable. Note that you must configure the plugins and dependencies in build.gradle and register the JSON converter in the application setup.@Serializable
data class Customer(val id: Int, val firstName: String, val lastName: String)When defining functions in Android development:
Context as the first parameter.// Context always be first
public User loadUser(Context context, int userId);
// Callbacks always be last
public void loadUserAsync(Context context, int userId, UserCallback callback);Users can interact with restaurant listings through the following features:
It is recommended to use Package By Feature (PBF) instead of Package By Layer (PBL).
Advantages of PBF over PBL:
service containing MainService.java.com
└── domain
└── app
├── App.java (Application class)
├── Config.java (Constants)
├── base (Base components)
├── custom_view (Custom views)
├── data (Data handling)
│ ├── DataManager.java
│ ├── local (SP, Database, File)
│ ├── model (Data structures, getters/setters)
│ └── remote (Remote data)
├── feature (Functional modules)
│ └── feature0
│ ├── feature0Activity.java
│ ├── feature0Fragment.java
│ └── xxAdapter.java
├── injection (Dependency injection)
├── util (Utility classes)
└── widget (Component classes)