Lv=(ListView) the findViewById (R.i d.l v); 
Lists=new ArrayList (a); 
Adapter=new MyAdapter (); 
Lv. SetAdapter (adapter); 

List Lists=new ArrayList (a); 
Myhelper Myhelper=new Myhelper (memolist. This); 
SQLiteDatabase db=myhelper. GetReadableDatabase (); 
Cursor Cursor=db. Query (" memolist ", null, null, null, null, null, null); 
If (cursor!=null& & Cursor. GetCount () & gt; 0 {
While (cursor. MoveToNext ()) {
String number=cursor. Get String (cursor. GetColumnIndex (" number ")); 
The String content=cursor. Get String (cursor. GetColumnIndex (" memoname ")); 
MemoData memodata=https://bbs.csdn.net/topics/new MemoData (content, number); 
Memodata. SetNumber (number); 
Memodata. SetContent (content); 
Lists. The add (memodata); 
} 
Cursor. The close (); 
The close (); 
Adapter. NotifyDataSetChanged (); 
} 
} 

//adapter 
Private class MyAdapter extends BaseAdapter {

@ Override 
Public int getCount () {
//TODO Auto - generated method stub 
Return lists. The size (); 
} 

@ Override 
Public Object the getItem (int arg0) {
//TODO Auto - generated method stub 
return null; 
} 

@ Override 
Public long getItemId (int arg0) {
//TODO Auto - generated method stub 
return 0; 
} 

@ Override 
Public View getView (int position, View converView, ViewGroup parent) {
//TODO Auto - generated method stub 

View the View; 
//if (converView==null) {
View=the inflate (getApplicationContext (), R.l ayout. Item, 
Null); 
//} else {
//the view=converView; 
//} 
TextView user_number=(TextView) view. The findViewById (R.i d.n o); 
TextView user_memoname=(TextView) view. The findViewById (R.i d.n ame); 
TextView time=(TextView) view. The findViewById (R.i which ime); 
MemoData MemoData=https://bbs.csdn.net/topics/lists.get (position); 
User_number. SetText (memodata getNumber ()); 
User_memoname. SetText (memodata getContent ()); 
//time. The setText (memodata getTime ()); 
Return the view; 
} 

 
Public class MemoData {
private String content; 
Private String number; 
Private String time; 
Public String getContent () {
return content; 
} 
Public void setContent (String content) {
this.content=content; 
} 
Public String getNumber () {
Return the number; 
} 
Public void setNumber (String number) {
This. Number=number; 
} 
Public String getTime () {
The return time. 
} 
Public void setTime (String time) {
This. Time=the time; 
} 
Public MemoData (String content, String number, String time) {
super(); 
this.content=content; 
This. Number=number; 
This. Time=the time; 
} 
Public MemoData (String content, String number) {
super(); 
this.content=content; 
This. Number=number; 
} 


} 

CodePudding user response:

Also post the error log, look at is where the null pointer

CodePudding user response:

Posted look at the wrong place

CodePudding user response:

GetItemId, and the getItem return you didn't change

CodePudding user response:

View the View;
//if (converView==null) {
View=the inflate (getApplicationContext (), R.l ayout. Item,
Null);
//} else {
//the view=converView;
//}
He did have a good look at the wrong

CodePudding user response:

Agree with upstairs, is it mistake

CodePudding user response:

@ Override
Public Object the getItem (int arg0) {
//TODO Auto - generated method stub
return null;
}

@ Override
Public long getItemId (int arg0) {
//TODO Auto - generated method stub
return 0;
}

The return value here are no change

CodePudding user response:

How to still use the list view