JAVA日报

从零开始的体温app开发（ThirdActivity）

package com.example.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import java.util.List;

import adapter.UserListAdapter;
import adapter.UserListAdapter2;
import bean.User;
import bean.User2;
import dao.UserDao;
import dao.UserDao2;

public class ThirdActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AbsListView.OnScrollListener {
    private ListView mUserList;
    private UserDao2 userDao=null;
    private List<User2> userList=null;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_third);
        mUserList=findViewById(R.id.user_list2);
        InitData();
        mUserList.setOnItemClickListener(this);
        mUserList.setOnScrollListener(this);
    }
    private void InitData(){
        userDao=UserDao2.getInstance(getApplicationContext());
        userList=userDao.findAll();
        UserListAdapter2 adapter=new UserListAdapter2(getApplicationContext(),userList);
        mUserList.setAdapter(adapter);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Intent intent = new Intent();
        Log.e("position",""+position);
        Toast.makeText(getApplicationContext(), "切换成功", Toast.LENGTH_SHORT).show();
        intent.putExtra("message",position);
        intent.setClass(getApplicationContext(), MainActivity.class);
        startActivity(intent);
        finish();
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

    }
}