无法在自定义ListView中显示SQLite数据库项目

Question

我从sqlite数据库中获取数据并尝试在CustomeListView中显示它但它显示了一些项目示例我可以在我的列表视图中看到六个项目，然后它显示了六个项目当我把它的滚动，它会反复显示相同的项目在这里是我的代码

我在这里从数据库

public ArrayList<GetEmailFromDatabase> emails_From_Database() { 
    SQLiteDatabase db = helper.getReadableDatabase(); 
    try { 
     GetEmailFromDatabase gefd; 
     ArrayList<GetEmailFromDatabase> results = new ArrayList<GetEmailFromDatabase>(); 
     Cursor c = db.rawQuery("select * from Emailreceived", null); 
     if (c.getCount() > 0) { 
      int i=0; 
      c.moveToPosition(i); 
      do { 
       gefd = new GetEmailFromDatabase(); 
       gefd.setMessage_No(c.getInt(c.getColumnIndex("_Id"))); 
       gefd.setFrom(c.getString(c.getColumnIndex("EmailFrom"))); 
       gefd.setDate(c.getString(c.getColumnIndex("EmailDate"))); 
       gefd.setSubject(c.getString(c.getColumnIndex("Subject"))); 
       results.add(gefd); 
       gefd = null; 
       i++; 
      } while (c.moveToPosition(i)); 
      c.close(); 
     } 
     return results; 
    } finally { 
     if (db != null) 
      db.close(); 
     } 
} 

查询这是我listActivity与自定义列表

public class Email_listActivity extends MenuOptions{ 

//Database getEmails = new Database(getApplicationContext()); 
String items[]={"red","white","Black","green","brown","yellow","blue","pink","orange"}; 
Database database; 
String mData; 

ArrayList<GetEmailFromDatabase> emailResults; 

Database db1; 
private EmailListFeedAdapter emailListFeedAdapter; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.email_list_main); 

    emailResults = new ArrayList<GetEmailFromDatabase>(); 

    emailListFeedAdapter = new EmailListFeedAdapter(this, R.layout.email_listview_row, emailResults); 
    setListAdapter(this.emailListFeedAdapter); 

     getResults(); 
     if(emailResults != null && emailResults.size() > -1){ 
      emailListFeedAdapter.notifyDataSetChanged(); 
     for(int i=0;i< emailResults.size();i++){ 
      emailListFeedAdapter.add(emailResults.get(i)); 
      Log.e("%%%%%%%%%%%%%%%%%%%", "emailResults -------->"+emailListFeedAdapter.areAllItemsEnabled()); 
     } 
     } 
} 
@Override 

protected void onListItemClick(ListView l, View v, int position, long id) { 
    super.onListItemClick(l, v, position, id); 
    int pos = position; 
    String s = (String) ((TextView) v.findViewById(R.id.item_number)).getText(); 
    database = new Database(getApplicationContext()); 
    mData = database.getDate(s); 

    Intent i = new Intent(Email_listActivity.this, EmailWebView.class); 
    i.putExtra("webData", mData); 
    startActivity(i); 
    Log.e("$$$$$$$$$$$$", "POSITION--------->"+position+" View-------->"+v); 
    Toast.makeText(getApplicationContext(), "Hello"+v, Toast.LENGTH_SHORT).show(); 
} 
public void getResults(){ 
    db1 = new Database(getBaseContext()); 
    emailResults = new ArrayList<GetEmailFromDatabase>(); 
    //ArrayList<GetEmailFromDatabase> fromdatabase = db1.emails_From_Database(); 
    emailResults = db1.emails_From_Database(); 

} 

public class EmailListFeedAdapter extends ArrayAdapter<GetEmailFromDatabase>{ 

    private ArrayList<GetEmailFromDatabase> itemss; 
    public EmailListFeedAdapter(Context context, int textViewResourceId, ArrayList<GetEmailFromDatabase> items) { 
     super(context, textViewResourceId, items); 
     this.itemss = items; 
    } 

    @Override 
    public View getView(int position, View emailView, ViewGroup parent) { 
     if(emailView == null){ 
     LayoutInflater inflater= (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     emailView= inflater.inflate(R.layout.email_listview_row, null); 

     GetEmailFromDatabase o = itemss.get(position); 
     if(o!=null){ 
     TextView messageNo = (TextView)emailView.findViewById(R.id.item_number); 
     TextView subject= (TextView)emailView.findViewById(R.id.emaillistrow_txt_partofemail); 
     TextView sender= (TextView)emailView.findViewById(R.id.emaillistrow_txt_sender); 
     TextView datetime= (TextView)emailView.findViewById(R.id.emaillistrow_txt_datetime); 
     ImageView icon= (ImageView)emailView.findViewById(R.id.emaillistrow_icon_indicator); 
     icon.setImageResource(R.drawable.y_icon); 

     if(messageNo!=null){ 
     messageNo.setText(Integer.toString(o.getMessage_No())); 
     } 
     if(subject!=null){ 
     subject.setText(o.getSubject()); 
     } 
     if(sender!=null){ 
     sender.setText(o.getFrom()); 
     } 
     if(datetime!=null){ 
     datetime.setText(o.getDate()); 
     } 
     } 
     } 
     return emailView; 

    } 

} 

} 

Answer 1

好了，你可以用我更换适配器类的getView（）方法，

@Override 
    public View getView(int position, View emailView, ViewGroup parent) { 
     if(emailView == null){ 
     LayoutInflater inflater= (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     emailView= inflater.inflate(R.layout.email_listview_row, null); 
     } 
     GetEmailFromDatabase o = itemss.get(position); 
     if(o!=null){ 
     TextView messageNo = (TextView)emailView.findViewById(R.id.item_number); 
     TextView subject= (TextView)emailView.findViewById(R.id.emaillistrow_txt_partofemail); 
     TextView sender= (TextView)emailView.findViewById(R.id.emaillistrow_txt_sender); 
     TextView datetime= (TextView)emailView.findViewById(R.id.emaillistrow_txt_datetime); 
     ImageView icon= (ImageView)emailView.findViewById(R.id.emaillistrow_icon_indicator); 
     icon.setImageResource(R.drawable.y_icon); 

     if(messageNo!=null){ 
     messageNo.setText(Integer.toString(o.getMessage_No())); 
     } 
     if(subject!=null){ 
     subject.setText(o.getSubject()); 
     } 
     if(sender!=null){ 
     sender.setText(o.getFrom()); 
     } 
     if(datetime!=null){ 
     datetime.setText(o.getDate()); 
     } 
     } 

     return emailView; 

    } 

更换，让我知道发生后

..