标签：数据库分页查询 android 数据库 界面 异步加载
1、数据库
package com.example.yqqmobilesafe.db;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class RubishSmsDbHelper extends SQLiteOpenHelper {
private static String DATABASE_NAME="rubishSms.db";
private static int VERSION=2;
public RubishSmsDbHelper(Context context) {
super(context, DATABASE_NAME, null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table rubish_sms(_id integer primary key autoincrement ,phone_number text not null,sms_content text not null)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("drop table if exists rubish_sms");
onCreate( db);
}
}
package com.example.yqqmobilesafe.db.dao;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.auth.NTCredentials;
import android.R.integer;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
import com.example.yqqmobilesafe.db.RubishSmsDbHelper;
import com.example.yqqmobilesafe.domain.RubishSmsInfo;
public class RubishSmsInfoDao {
private boolean D=true;
private RubishSmsDbHelper mDbHelper;
public RubishSmsInfoDao(Context context) {
mDbHelper=new RubishSmsDbHelper(context);
}
/**
* 添加垃圾短信信息
* @param info
*/
public void addSmsInfos(RubishSmsInfo info ){
SQLiteDatabase database=null;
try {
database=mDbHelper.getWritableDatabase();
database.execSQL("insert into rubish_sms(phone_number,sms_content) values(?,?)",new String[]{info.getPhoneNumber(),info.getSmsContent()});
database.close();
} catch (Exception e) {
if(D){
Log.i("RubishSmsInfoDao","数据库插入失败！！！");
}
}
}
/**
* 删除垃圾短信
* @param info
*/
public void deleteSmsInfos(RubishSmsInfo info ){
SQLiteDatabase database=null;
try {
database=mDbHelper.getWritableDatabase();
database.execSQL("delete from rubish_sms where phone_number=?",new String[]{info.getPhoneNumber()});
database.close();
} catch (Exception e) {
if(D){
Log.i("RubishSmsInfoDao","数据库垃圾短信信息删除失败！！！");
}
}
}
/**
* 分页查询
* @param number
* @param offset
* @return
*/
public List<RubishSmsInfo> findInfosbyPage(int number,int offset){
SQLiteDatabase database=null;
Cursor cursor=null;
List<RubishSmsInfo> infos=new ArrayList<RubishSmsInfo>();
try {
database=mDbHelper.getWritableDatabase();
cursor=database.rawQuery("select phone_number,sms_content from rubish_sms limit ? offset ?",new String[]{number+"",offset+""});
while(cursor.moveToNext()){
RubishSmsInfo info=new RubishSmsInfo();
info.setPhoneNumber(cursor.getString(0));
info.setSmsContent(cursor.getString(1));
infos.add(info);
info=null;
}
cursor.close();
database.close();
} catch (Exception e) {
if(D){
Log.i("RubishSmsInfoDao","数据库垃圾短信信息分页查询失败！！！");
}
}
return infos;
}
/**
* 获得记录的最大数目
* @return
*/
public int getMaxCount(){
SQLiteDatabase database=null;
Cursor cursor=null;
int num=0;
try {
database=mDbHelper.getReadableDatabase();
cursor=database.rawQuery("select phone_number,sms_content from rubish_sms",null);
while(cursor.moveToNext()){
num++;
}
} catch (Exception e) {
if(D){
Log.i("RubishSmsInfoDao","数据库垃圾短信信息数量统计失败！！！");
}
}
return num;
}
}
2、界面
package com.example.yqqmobilesafe;
import java.util.List;
import android.app.Activity;
import android.app.Dialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.yqqmobilesafe.db.dao.RubishSmsInfoDao;
import com.example.yqqmobilesafe.domain.RubishSmsInfo;
public class RubishSmsActivity extends Activity {
private ListView mRubishSms;//显示垃圾短信的列表
private List<RubishSmsInfo> mInfos;//垃圾短信信息
private RubishSmsInfosAdapter mAdapter;//垃圾短信信息适配器
private int maxNum=5;//分页加载每页的最大数目
private int offset=0;//偏移
private int totalNums;//垃圾短信的总数目
private RubishSmsInfoDao mRubishSmsInfoDao;//垃圾短信信息的数据库表操作对象
private View loading;//数据加载提示
public RubishSmsActivity() {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
init();
setListener();
super.onCreate(savedInstanceState);
}
private void init() {
setContentView(R.layout.activity_rubish_sms);
mRubishSms=(ListView) findViewById(R.id.lv_rubish_sms_content);
mRubishSmsInfoDao=new RubishSmsInfoDao(getApplicationContext());
totalNums=mRubishSmsInfoDao.getMaxCount();
loading=findViewById(R.id.ll_rublish_sms_info_loading);
}
/**
* 设置监听事件
*/
private void setListener(){
//下拉列表的时候分页加载数据
mRubishSms.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
//在下拉列表空闲的时候显示数据
case OnScrollListener.SCROLL_STATE_IDLE:
//获得分页加载的每页最大值
int position=mRubishSms.getLastVisiblePosition();
int total=0;
if(mInfos!=null){
// total=maxNum;
total=mInfos.size();
}
if(position==total-1){
//到达该分页加载的末尾位置
offset+=maxNum;
if(offset>totalNums){
Toast.makeText(RubishSmsActivity.this,"数据已经加载完，没有更多的数据了...", 300).show();
return;
}
//异步任务加载数据
fillData();
}
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}
});
fillData();
//每个条目绑定监听
mRubishSms.setOnItemClickListener(new OnItemClickListener() {
View m_view=View.inflate(RubishSmsActivity.this,R.layout.show_rubish_sms_operation,null);
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//获得条目对应的每个对象
Object object=mRubishSms.getItemAtPosition(position);
if(object instanceof RubishSmsInfo){
final RubishSmsInfo info=(RubishSmsInfo) object;
//对对象的操作1、删除2、恢复到收件箱3、加入黑名单
Dialog builder=new Dialog(RubishSmsActivity.this);
builder.setTitle("提示");
builder.setContentView(m_view);
//删除
((TextView)m_view.findViewById(R.id.tv_delete)).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mInfos.remove(info);
if(mRubishSmsInfoDao==null){
mRubishSmsInfoDao=new RubishSmsInfoDao(getApplicationContext());
}
mRubishSmsInfoDao.deleteSmsInfos(info);
if(mAdapter==null){
mAdapter=new RubishSmsInfosAdapter();
mRubishSms.setAdapter(mAdapter);
}else{
mAdapter.notifyDataSetChanged();
}
}
});
//恢复到收件箱
((TextView)m_view.findViewById(R.id.tv_recovery_sms)).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
//加入黑名单
((TextView)m_view.findViewById(R.id.tv_add_black_number)).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
builder.show();
}
}
});
}
/**
* 异步任务给列表加载数据
*/
private void fillData(){
new AsyncTask<Void,Void,Void>(){
@Override
protected void onPreExecute() {
loading.setVisibility(View.VISIBLE);
super.onPreExecute();
}
@Override
protected void onPostExecute(Void result) {
loading.setVisibility(View.INVISIBLE);
//刷新界面列表数据
if(mAdapter==null){
mAdapter=new RubishSmsInfosAdapter();
mRubishSms.setAdapter(mAdapter);
}else{
mAdapter.notifyDataSetChanged();
}
super.onPostExecute(result);
}
@Override
protected Void doInBackground(Void... params) {
if(mInfos==null){
mInfos=mRubishSmsInfoDao.findInfosbyPage(maxNum, offset);
}else{
mInfos.addAll(mRubishSmsInfoDao.findInfosbyPage(maxNum, offset));
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}.execute();
}
/**
* 垃圾短信显示的数据适配器
* @author yqq
*
*/
private class RubishSmsInfosAdapter extends BaseAdapter{
@Override
public int getCount() {
return mInfos.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mInfos.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view=null;
ViewHolder holder=null;
if(convertView!=null&& convertView instanceof LinearLayout){
view=convertView;
holder=(ViewHolder) view.getTag();
}else{
holder=new ViewHolder();
view=View.inflate(RubishSmsActivity.this,R.layout.rubish_sms_info_item,null);
holder.tvPhoneNumber=(TextView) view.findViewById(R.id.tv_phone_number);
//holder.tvDate=(TextView) view.findViewById(R.id.tv_received_date);
holder.tvContent=(TextView) view.findViewById(R.id.tv_rubish_sms_content);
view.setTag(holder);
}
holder.tvPhoneNumber.setText("电话号码:"+mInfos.get(position).getPhoneNumber());
//holder.tvDate.setText(mInfos.get(position).getReceivedDate());
holder.tvContent.setText("短信内容:"+mInfos.get(position).getSmsContent());
return view;
}
}
static class ViewHolder{
TextView tvPhoneNumber;//电话号码显示
//TextView tvDate;//日期显示
TextView tvContent;//短信内容显示
}
}
标签：数据库分页查询 android 数据库 界面 异步加载
原文地址：http://blog.csdn.net/u014600432/article/details/41440535
