package eoe.listview;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;public class MainActivity extends Activity {
private ListView listview;
private ProgressBar loadBar;
private TextView loadText;
private ShopAdapter adapter;
private int start=0;//开始数量
private int limit=3;//每页数量
@Override
public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listview=(ListView)findViewById(R.id.main_ListView);
loadBar=(ProgressBar)findViewById(R.id.main_loadBar);
loadText=(TextView)findViewById(R.id.main_loadText);
adapter=new ShopAdapter(this);
listview.setAdapter(adapter);
listview.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView arg0, View arg1,int count, long arg3) {
if(adapter.getCount()==count+1){
loadText.setText("下载中...");
loadBar.setVisibility(View.VISIBLE);
new Thread(mRunnable).start();
}
}
@Override
public void onNothingSelected(AdapterView arg0) {}
});
new Thread(mRunnable).start();
}
/**
* 商店列表线程
*/
private Runnable mRunnable=new Runnable(){
public void run(){
try {
Thread.sleep(1500);
mHandler.sendMessage(mHandler.obtainMessage());
} catch (InterruptedException e) {
//System.out.println("Error-"+e.getMessage());
}
}
};
Handler mHandler=new Handler(){
public void handleMessage(Message msg){
super.handleMessage(msg);
loadHotShop(limit);
}
};
/**
* 加载店铺
* @return
*/
public void loadHotShop(int limit){
DBLocalService db=new DBLocalService(this);
Cursor cursor=db.querySQL("select * from "+db.TABLE_SHOP+" limit "+start+","+limit,null);
if(cursor.getCount()>0) this.start+=limit;
while(cursor.moveToNext()){
Shop s=new Shop();
s.setId(cursor.getString(cursor.getColumnIndex("id")));
s.setTitle(cursor.getString(cursor.getColumnIndex("title")));
adapter.addShop(s);
}
loadText.setText("");
loadBar.setVisibility(View.GONE);
}
}
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我们第一个应该看见的就是声明了很多私有的变量,因为这样设置就可以变成只能自己来调用了,这样和其它的不发生冲突。其中我们设置了开始数量和每页数量。我们还要new一个adapter=new ShopAdapter(this);这个this就是写的本类,也可以写成类名.this。这个就是看个人的喜好,完事我们开始判断,记住的是,在判断的条件中count是要加1的,这个大家可要记住了我们在写一个run方法,则个就自己来顶了,就不多说了。我们最后写一个loadHotShop()方法,这个方法中要写上你的参数,也就是你想加载几页,就这样,我们分页加载就完成了。要是大家还不懂的话,可以回帖和我交流。要是有更好的方法也可以发帖,分享给大家。