sqlite数据库数据的分页

时间 2019-12-05

原文原文链接

sqlite数据库数据的分页android

效果图示例sql

一、在清单里添加对数据库操做的权限数据库

代码ide

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>函数

=================================工具

二、有2个布局一个activity_main.xml 一个item_activity.xml布局

1）activity_main.xml布局文件this

代码sqlite

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >xml

</LinearLayout>

</RelativeLayout>

-----------------------------------

item_activity.xml布局文件

代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

</LinearLayout>

--------------------------------

三、有2个类一个工具类用来对数据库的增删改查操做一个MainActivity类

工具类

代码

public class Sqlite_operate_utils {

private static String DB_PATH = Environment.getExternalStorageDirectory() + File.separator + "stuentinfo.db";
private SQLiteDatabase db;

//构造函数 new 该类的时候就去找须要找的数据库
public Sqlite_operate_utils() {
  db = SQLiteDatabase.openDatabase(DB_PATH, null, SQLiteDatabase.OPEN_READWRITE);
}

//查询数据的方法1
public Cursor sqlite_select(String content, String[] condition){
  return db.rawQuery(content, condition);
}

//查询数据的方法2
public List<Map<String, String>> sqlite_selectlist(String content, String[] condition){
  Log.i("data", "cursor:");
  Cursor cursor = db.rawQuery(content, condition);
  return cursorToList(cursor);
}
//返回List
public List<Map<String, String>> cursorToList(Cursor cursor) {
  List<Map<String, String>> list = new ArrayList<Map<String,String>>();
  while(cursor.moveToNext()){//数据库表的行
   Map<String, String> map = new HashMap<String, String>();
   for(int i = 0;i<cursor.getColumnCount();i++){//数据库表的列
    map.put(cursor.getColumnName(i), cursor.getString(i));
   }
   list.add(map);
  }
  cursor.close();
  Log.i("data", "list:" + list.size());
  return list;
}

//增删改的方法
//返回布尔型方便查看数据操做是否成功
public boolean executeData(String execute_content, Object[] bindArgs){
  try {
   if(bindArgs == null){//要绑定占位符的参数值
    db.execSQL(execute_content);
    return true;
   }else{
    db.execSQL(execute_content, bindArgs);
    return true;
   }
  } catch (SQLException e) {
   e.printStackTrace();
   return false;
  }
}

//关闭db
public void destroy(){
  if(db != null){
   db.close();
  }
}
}

==========================

MianActivity类

代码

public class MainActivity extends Activity {

private ListView listview;
private LinearLayout layout_progress;
private Sqlite_operate_utils sql;
private SimpleAdapter adapter;
private List<Map<String, String>> list_datainfo;

// 分页属性声明
private int pageNo = 1;// 第几页
private int pageSize = 10;// 每页有多少条数据
private int pageCount;// 总页数
private boolean isbottom;// 用来判断是不是底部

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

  this.listview = (ListView) this
    .findViewById(R.id.listView_main_titlelist);
  this.layout_progress = (LinearLayout) this
    .findViewById(R.id.layout_more);
  sql = new Sqlite_operate_utils();

  //计算数据库学生信息表的总页数
        String content = "select count(*) from studentinfo ";//一行一列数据
  Cursor cursor = sql.sqlite_select(content, null);
  cursor.moveToFirst();//移动游标到一地个位置
     int count = cursor.getInt(0);//总记录数
  //关闭游标
  cursor.close();
  pageCount = (int)Math.ceil(count/(double)pageSize);

  list_datainfo = getInfo();
  adapter = new SimpleAdapter(this, list_datainfo, R.layout.item_listview,
    new String[] { "s_sex", "s_age", "s_score" }, new int[] {
      R.id.text_item_listview_name,
      R.id.text_item_listview_id,
      R.id.text_item_listview_score });
  listview.setAdapter(adapter);
  //listview滚动事件监听
  listview.setOnScrollListener(new OnScrollListener() {
   @Override
   public void onScrollStateChanged(AbsListView view, int scrollState) {
    if(isbottom){
     if(pageCount == pageNo){
      Toast.makeText(MainActivity.this, "没有更多数据!!", Toast.LENGTH_SHORT).show();
     }else{
      layout_progress.setVisibility(View.VISIBLE);
     }
    }

   }
   @Override
   public void onScroll(AbsListView view, int firstVisibleItem,
     int visibleItemCount, int totalItemCount) {
    isbottom = ((firstVisibleItem + visibleItemCount) == totalItemCount);
   }
  });
}

//进度加载的点击事件监听 public void clickButton(View view){ if(pageNo<pageCount){ pageNo++; list_datainfo.addAll(getInfo()); //更新 listview 视图 adapter.notifyDataSetChanged(); } layout_progress.setVisibility(View.GONE); } private List<Map<String, String>> getInfo() { List<Map<String, String>> list = new ArrayList<Map<String,String>>(); //分页 int start = (pageNo - 1)*pageSize; String content = "select * from studentinfo limit ?,?"; String[] condition = {start + "",pageSize + ""}; list = sql.sqlite_selectlist(content, condition); return list; }}