2021.05.18 刘一辰的软件工程随笔

今日目标：outactivity

 

今日总结：

package com.study.temperature;

import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class OutActivity extends Activity {

private ListView lv_list;
private ArrayList<Person> persons = new ArrayList<Person>();

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

lv_list = (ListView)findViewById(R.id.lv_list);
MyopenHelper helper = new MyopenHelper(this,1);
SQLiteDatabase readableDatabase = helper.getReadableDatabase();
String sql = "select * from info";
Cursor curor = readableDatabase.rawQuery(sql , null);
//遍历查询到的结果
int count=0;
while(curor.moveToNext()){
//创建person对象
Person person = new Person();
//根据列名 name 获取数据库中对应的值
String name = curor.getString(curor.getColumnIndex("name"));
//根据列名 phone 获取数据库中对应的值
String temon = curor.getString(curor.getColumnIndex("temon"));
String temunder = curor.getString(curor.getColumnIndex("temunder"));
String time = curor.getString(4);
String locat = curor.getString(5);
//设置相应数据
person.setName(name);
person.setTemon(temon);
person.setTemunder(temunder);
person.setTime(time);
person.setLocat(locat);
//把数据添加到集合
persons.add(person);
count++;
}
//list显示
//把数据适配器和listview绑定
lv_list.setAdapter(new MyAdapter());
//关闭游标
curor.close();
helper.close();
if(count!=0) {
Toast.makeText(this, "查询成功", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(this, "查询失败", Toast.LENGTH_SHORT).show();
}
lv_list.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//点击跳转
Intent intent =new Intent(OutActivity.this,SmallitemActivity.class);
//启动填写页面
Person tem =persons.get(position);
intent.putExtra("name",tem.getName());
intent.putExtra("info", tem.getTime()+"\n"+tem.getLocat());
startActivity(intent);
}
});
}
private class MyAdapter extends BaseAdapter{

//返回要展示的数据集合的条目数
@Override
public int getCount() {
return persons.size();
}
//通过adapter传进来的posion(listview中条目的position)
//把它对应的数据集合中的对象返回来
@Override
public Object getItem(int position) {
return persons.get(position);
}

@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//①把布局文件转换为View对象 需要判断convertView是否为空
View view= null;
if(convertView == null){
//创建view对象
view = View.inflate(OutActivity.this, R.layout.item, null);
}else{
//复用旧的convertView
view = convertView;
}
//②找到要修改的控件的对象 注意要调用view.findViewById
TextView tv_name = (TextView)view.findViewById(R.id.tv_name);
TextView tv_tem = (TextView)view.findViewById(R.id.tv_tem);

//③ 设置数据
//3.1通过position 到数据集合中把要显示的数据找到
Person person = persons.get(position);
//3.2把要显示的内容展示到对应的View对象上
tv_name.setText(person.getName());
tv_tem.setText("上午："+person.getTemon()+"下午："+person.getTemunder());
return view;
}
}
}

 

明日目标：out_xml