ZLUKADARK's questions

模型.py

from django.db import models
from datetime import timedelta
from django.contrib.auth.models import User


class Task(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=3000)
    IMPORTANCE = (
        ('H', 'High'),
        ('M', 'Medium'),
        ('L', 'Low'),
    )
    importance = models.CharField(max_length=1, choices=IMPORTANCE)
    deadline = models.DateField()
    date_joined = models.DateField(auto_now_add=True)          
    completed = models.BooleanField(default=False, blank=True, null=True)
    objects = models.Manager()
    def __str__(self):
        return self.title

序列化程序.py

from rest_framework import serializers
from .models import Task

class TaskSerializer(serializers.ModelSerializer):

    class Meta:
        model = Task
        fields = '__all__'
        user = serializers.Field(source='user.username')

class ListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Task
        fields = ('title','deadline','completed','importance','id','user',)

视图.py

from rest_framework.decorators import api_view
from rest_framework import status, permissions, generics
from rest_framework.permissions import IsAuthenticated
from django.contrib.auth import authenticate, login
from rest_framework.response import Response
from .serializers import TaskSerializer, ListSerializer
from .models import Task
from .permissions import IsOwnerOrReadOnly

class taskCreate(generics.ListCreateAPIView):
    queryset = Task.objects.all()
    serializer_class = TaskSerializer
    permission_classes = [permissions.IsAuthenticated]
    @api_view(['POST'])
    def taskCreate(request, obj):
        serializer = TaskSerializer(data=request.data)
        if serializer.is_valid():
            obj.user = self.request.user
            serializer.save(obj.user)
        return Response(serializer.data)
    

VIEWS.PY

from rest_framework.decorators import api_view
from rest_framework import status, permissions, generics
from rest_framework.permissions import IsAuthenticated
from django.contrib.auth import authenticate, login
from rest_framework.response import Response
from .serializers import TaskSerializer, ListSerializer
from .models import Task

class ViewListPermission(generics.ListAPIView):
    queryset = Task.objects.all()
    serializer_class = ListSerializer
    permission_classes = [permissions.IsAuthenticated] 

class taskList(ViewListPermission):
    @api_view(['GET'])
    def taskList(request):
        tasks = Task.objects.all()
        serializer = ListSerializer(tasks, many = True)
        return  Response(serializer.data)

SERIALAIZER.PY

from rest_framework import serializers
from .models import Task

class ListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Task
        fields = ('title','deadline','completed','importance','id')

Adapter  

package com.example.notes.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.example.notes.R;

import java.util.ArrayList;
import java.util.List;

public class MainAdapter extends RecyclerView.Adapter<MainAdapter.MyViewHolder> {
    private Context context;
    private List<String> mainArray;

    public MainAdapter(Context context) {
        this.context = context;
        mainArray = new ArrayList<>();
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_list_layout, parent,false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.setData(mainArray.get(position));
    }

    @Override
    public int getItemCount() {
        return mainArray.size();
    }

    static class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView ltitle;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            ltitle = itemView.findViewById(R.id.ltitle);
        }
        public void setData(String title) {
            ltitle.setText(title);
        }
    }

    public void updateAdapter(List<String> newList) {
        mainArray.clear();
        mainArray.addAll(newList);
        notifyDataSetChanged();
    }
}


MainActivity

package com.example.notes;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;


import com.example.notes.adapter.MainAdapter;
import com.example.notes.db.MyDbManager;


public class MainActivity extends AppCompatActivity {
    private MyDbManager myDbManager;
    private EditText title_id, desc_id;
    private RecyclerView rView;
    private MainAdapter mainAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init() {
        myDbManager = new MyDbManager(this);
        title_id = findViewById(R.id.title_id);
        desc_id = findViewById(R.id.desc_id);
        rView = findViewById(R.id.rView);
        rView.setLayoutManager(new LinearLayoutManager(this));
        rView.setAdapter(mainAdapter);
        mainAdapter = new MainAdapter(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        myDbManager.openDb();
        mainAdapter.updateAdapter(myDbManager.getDb());

    }

    public void onClickAdd(View view) {
        Intent add = new Intent(MainActivity.this, EditActivity.class);
        startActivity(add);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        myDbManager.closeDb();
    }

}