android - Android：通过单击列表视图上的项目进行导航并检索数据库中的数据并将其显示在另一个列表视图中

Question

我有一个从数据库中检索到的列表视图

 public class DiseaseList extends ListActivity{


DataHelper dh;



@Override   
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.diseaselist);

    dh = new DataHelper(this);
    dh.open();
    dh.getAllDiseaseNames();

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);

    setListAdapter(adapter);

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);

    String item=(String)getListAdapter().getItem(position);


    if(item.equals("Pain")){
        dh.getSymptomsByDiseaseId(1);   
        startActivity(new Intent(DiseaseList.this,Symptoms.class));
            }
            else if(item.equals("Color change in teeth")){
                dh.getSymptomsByDiseaseId(2);
                startActivity(new Intent(DiseaseList.this,Symptoms.class));
            }
            else if(item.equals("bleeding gums")){
                startActivity(new Intent(DiseaseList.this,Questions.class));
            }
            else if(item.equals("decay in teeth")){
                startActivity(new Intent(DiseaseList.this,Questions.class));
            }
            else if(item.equals("dislodged caps")){
                startActivity(new Intent(DiseaseList.this,Questions.class));
            }
            }
              }

我的 datahelper 类方法来检索这些数据是：

 public List<String> getAllDiseaseNames() {
         List<String> diseasename = null;

         cr = db.query(DISEASE_TABLE_NAME,new String[] {DISEASE_NAME}, null, null, null, null, null);

            if(null != cr){
                  diseasename = new ArrayList<String>();
                  if (cr.moveToFirst()) {
                     do {
                        diseasename.add(cr.getString(0));
                     }  while (cr.moveToNext());
                  }

                  if (cr != null && !cr.isClosed()) {
                      cr.close();
                  }
              }
              return diseasename;
           } 


     //symptomsbydiseaseid to get symptoms in list view

     public List<String> getSymptomsByDiseaseId(long diseaseId) {

            List<String> symptomsList = new ArrayList<String>();

            String selection = "diseaseid=?";
            String[] selectionArgs = { String.valueOf(diseaseId) };
            cr = db.query(false, SYMPTOM_TABLE_NAME, null, selection, selectionArgs, null, null, null, null);
            if (cr.moveToFirst()) {
                do {
                    symptomsList.add(cr.getString(0));
                } while (cr.moveToNext());
            }
            cr.close();

            return symptomsList;
        }

现在在第一个列表视图中，当我单击 "A" 时，我应该移动到另一个列表活动并在类别 A 下显示另一个列表视图，与 B、C 和 D 相同......在另一个列表视图下，它将有另一个列表单击它们时要问的问题

我的症状如下：

package com.dentabtechnologies.appstart;

import com.example.dentabtechnologies.R;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class Symptoms extends ListActivity {

        @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.symptoms);

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);

    setListAdapter(adapter);

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);
}   

} 

我怎样才能做到这一点？谢谢

流程来自疾病列表视图>症状列表视图>子症状列表视图>和不同文本视图中的问题

Answer 1

首先向适配器添加数据：

adapter.addAll(dh.getAllDiseaseNames())