【发布时间】：2017-09-19 03:23:53
【问题描述】：
我尝试使用 json 从 mysql 创建一个包含 629 条记录部分的列表视图，列表视图正在运行，但在向下滚动时数据显示双倍
这是我的 StockActivity：
public class StockActivity extends Activity {
public ArrayList<HashMap<String, String>> list;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stock);
listView=(ListView)findViewById(R.id.listView1);
list=new ArrayList<HashMap<String,String>>();
list.clear();
getPartId();
}
public void getPartId(){
class GetPartId extends AsyncTask<Void,Void,String> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
runOnUiThread(new Runnable() {
@Override
public void run() {
pDialog = new ProgressDialog(StockActivity.this);
pDialog.setMessage("Showing Part...wait");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
});
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
pDialog.dismiss();
showPartId(s);
}
@Override
protected String doInBackground(Void... params) {
String s = null;
RequestHandler rh = new RequestHandler();
s = rh.sendGetRequest(konfigurasi.URL_TAMPIL_ALL);
return s;
}
}
GetPartId gPI = new GetPartId();
gPI.execute();
}
private void showPartId(String json){
try {
//Mencari nilai No_Part
JSONObject jsonObject = new JSONObject(json);
JSONArray result = jsonObject.getJSONArray(konfigurasi.TAG_JSON_ARRAY);
for ( int i=0;i<result.length();i++) {
JSONObject c = result.getJSONObject(i);
String No_Part = c.getString(konfigurasi.TAG_NO_PART);
String Part_Desc = c.getString(konfigurasi.TAG_PART_DESC);
String Spec1 = c.getString(konfigurasi.TAG_SPEC1);
String Spec2 = c.getString(konfigurasi.TAG_SPEC2);
String Sat = c.getString(konfigurasi.TAG_SAT);
String Location = c.getString(konfigurasi.TAG_LOCATION);
//String Qty_Akhir = c.getString(konfigurasi.TAG_QTY_AKHIR);
HashMap<String,String> temp = new HashMap<String, String>();
temp.put(COLUMN1, No_Part);
temp.put(COLUMN2, Part_Desc);
temp.put(COLUMN3, Spec1);
temp.put(COLUMN4, Spec2);
temp.put(COLUMN5, Sat);
temp.put(COLUMN6, Location);
//temp.put(COLUMN7, Qty_Akhir);
list.add(temp);
ListViewAdapter adapter=new ListViewAdapter(this, list);
adapter.notifyDataSetChanged();listView.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, final View view, int position, long id)
{
int pos=position+1;
Toast.makeText(StockActivity.this, Integer.toString(pos)+" Clicked", Toast.LENGTH_SHORT).show();
}
});
}
}这是我的常数
package com.example.asus.mywarehouse;
public class Constants {
public static final String COLUMN1="No_Part";
public static final String COLUMN2="Part_Desc";
public static final String COLUMN3="Spec1";
public static final String COLUMN4="Spec2";
public static final String COLUMN5="Sat";
public static final String COLUMN6="Location";
public static final String COLUMN7="Qty_Onh";
}这是我的 ListViewAdapter
package com.example.asus.mywarehouse;
import static com.example.asus.mywarehouse.Constants.COLUMN1;
import static com.example.asus.mywarehouse.Constants.COLUMN2;
import static com.example.asus.mywarehouse.Constants.COLUMN3;
import static com.example.asus.mywarehouse.Constants.COLUMN4;
import static com.example.asus.mywarehouse.Constants.COLUMN5;
import static com.example.asus.mywarehouse.Constants.COLUMN6;
import static com.example.asus.mywarehouse.Constants.COLUMN7;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class ListViewAdapter extends BaseAdapter{
public ArrayList<HashMap<String, String>> list;
Activity activity;
TextView txt1;
TextView txt2;
TextView txt3;
TextView txt4;
TextView txt5;
TextView txt6;
TextView txt7;
public ListViewAdapter(Activity activity,ArrayList<HashMap<String, String>> list){
super();
this.activity=activity;
this.list=list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
//return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater=activity.getLayoutInflater();
if(convertView == null){
convertView=inflater.inflate(R.layout.colm_row, null);
txt1=(TextView) convertView.findViewById(R.id.No_Part);
txt2=(TextView) convertView.findViewById(R.id.Part_Desc);
txt3=(TextView) convertView.findViewById(R.id.Spec1);
txt4=(TextView) convertView.findViewById(R.id.Spec2);
txt5=(TextView) convertView.findViewById(R.id.Sat);
txt6=(TextView) convertView.findViewById(R.id.Location);
txt7=(TextView) convertView.findViewById(R.id.Qty_Onh);
}
HashMap<String, String> map=list.get(position);
txt1.setText(map.get(COLUMN1));
txt2.setText(map.get(COLUMN2));
txt3.setText(map.get(COLUMN3));
txt4.setText(map.get(COLUMN4));
txt5.setText(map.get(COLUMN5));
txt6.setText(map.get(COLUMN6));
txt7.setText(map.get(COLUMN7));
convertView.setTag(list.get(position));
return convertView;
}
}谁能解决这个问题，谢谢帮助
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标签： javascript arrays json listview mysqli