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我無法清除應用程序中的數據。如果我選擇了我的老師的名字，將顯示我的老師的時間表學習。但是當我選擇了另一位姓名老師之後，來自第一位老師的數據時間表不能清楚，並且仍然在數據時間表上看到了老師。如何清除列表查看我的數據
這是我的腳本 JadwalDosen.java
package www.kates.com;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class JadwalDosen extends ListActivity{
\t private JadwalDosenAdapter adapter;
\t private Spinner dosen;
\t private List<String> iddosen = new ArrayList<String>();
\t @Override
\t public void onCreate(Bundle bundle){
\t \t super.onCreate(bundle);
\t \t setContentView(R.layout.jadwaldosen);
\t \t adapter = new JadwalDosenAdapter(this, getListView().getId());
\t \t setListAdapter(adapter);
\t \t dosen = (Spinner)findViewById(R.id.jadwalnamadosen);
\t \t Connector con = new Connector("get_dosen.php","GET",null) {
\t \t \t @Override
\t \t \t public void onFinish(JSONArray data) {
\t \t \t \t if(data!=null){
\t \t \t \t \t if(data.length()>0){
\t \t \t \t \t \t List<String> namaDosen = new ArrayList<String>();
\t \t \t \t \t \t for(int i=0;i<data.length();i++){
\t \t \t \t \t \t \t try {
\t \t \t \t \t \t \t \t iddosen.add(data.getJSONObject(i).getString("IdDosen"));
\t \t \t \t \t \t \t \t namaDosen.add(data.getJSONObject(i).getString("NamaDosen"));
\t \t \t \t \t \t \t } catch (JSONException e) {
\t \t \t \t \t \t \t \t e.printStackTrace();
\t \t \t \t \t \t \t }
\t \t \t \t \t \t }
\t \t \t \t \t \t ArrayAdapter<String> sAdapter = new ArrayAdapter<String>(JadwalDosen.this, android.R.layout.simple_spinner_item,namaDosen);
\t \t \t \t \t \t sAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
\t \t \t \t \t \t dosen.setAdapter(sAdapter);
\t \t \t \t \t \t dosen.setOnItemSelectedListener(new OnItemSelectedListener() {
\t \t \t \t \t \t \t public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
\t \t \t \t \t \t \t \t List<NameValuePair> info = new ArrayList<NameValuePair>();
\t \t \t \t \t \t \t \t info.add(new BasicNameValuePair("id_dosen", iddosen.get(pos)));
\t \t \t \t \t \t \t \t Connector con = new Connector("get_jadwal_dosen.php","GET",info) {
\t \t \t \t \t \t \t \t \t @Override
\t \t \t \t \t \t \t \t \t public void onFinish(JSONArray data) {
\t \t \t \t \t \t \t \t \t \t if(data!=null){
\t \t \t \t \t \t \t \t \t \t \t if(data.length()>0){
\t \t \t \t \t \t \t \t \t \t \t \t for(int j=0; j<data.length();j++){
\t \t \t \t \t \t \t \t \t \t \t \t \t try {
\t \t \t \t \t \t \t \t \t \t \t \t \t \t adapter.add(data.getJSONObject(j));
\t \t \t \t \t \t \t \t \t \t \t \t \t \t adapter.notifyDataSetChanged();
\t \t \t \t \t \t \t \t \t \t \t \t \t } catch (JSONException e) {
\t \t \t \t \t \t \t \t \t \t \t \t \t \t e.printStackTrace();
\t \t \t \t \t \t \t \t \t \t \t \t \t }
\t \t \t \t \t \t \t \t \t \t \t \t }
\t \t \t \t \t \t \t \t \t \t \t }
\t \t \t \t \t \t \t \t \t \t }
\t \t \t \t \t \t \t \t \t }
\t \t \t \t \t \t \t \t };
\t \t \t \t \t \t \t }
\t \t \t \t \t \t \t public void onNothingSelected(AdapterView<?> parent) {
\t \t \t \t \t \t \t \t
\t \t \t \t \t \t \t }
\t \t \t \t \t \t });
\t \t \t \t \t }
\t \t \t \t }
\t \t \t }
\t \t };
\t }
}JadwalDosenAdapter.java
package www.kates.com;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import org.json.JSONObject;
public class JadwalDosenAdapter extends ArrayAdapter<JSONObject>{
\t public JadwalDosenAdapter(Context context, int resource) {
\t \t super(context, resource);
\t }
\t @Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final JSONObject item = getItem(position);
if (!item.equals(null)) {
View view = inflater.inflate(R.layout.jadwal_dosen_item, parent, false);
try {
((TextView)view.findViewById(R.id.jadwal_makul)).setText(item.getString("NamaMakul"));
((TextView)view.findViewById(R.id.jadwal_kategori)).setText(item.getString("KategoriJadwal"));
((TextView)view.findViewById(R.id.jadwal_hari)).setText(item.getString("Hari"));
((TextView)view.findViewById(R.id.jadwal_jam)).setText("Jam ke- : " + item.getString("JamMulai") + " s/d " + item.getString("JamSelesai"));
((TextView)view.findViewById(R.id.jadwal_kelas)).setText(item.getString("NamaKelas"));
((TextView)view.findViewById(R.id.jadwal_ruang)).setText("Ruangan : " + item.getString("Ruang"));
} catch (Exception exc) {
\t exc.printStackTrace();
}
return view;
} else {
return null;
}
} \t
}請幫我選擇了一個
有一個'上ArrayAdapters clear'方法 –