我想在下一个活动中更改自定义数据列表。请帮我。我试过notifysetdatachanged()了，但我的清单保持不变。我想更新我的列表数据。
- 首先我保存数据并将其显示在列表中
- 然后在 listActivity 我使用意图将数据传递到下一个 Activity
- 然后在下一个活动中我使用更新方法
- 现在在按钮中单击我想根据下一个活动的更改更新列表
自定义适配器的代码在这里：
public class CustomAdapter extends ArrayAdapter<Newd> {
Context context;
int layoutResourceId;
static Newd data[];
public BookHolder holder = null;
public CustomAdapter(Context context, int textViewResourceId,Newd[] objects) {
super(context, textViewResourceId, objects);
this.layoutResourceId = textViewResourceId;
this.context = context;
CustomAdapter.data = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
//BookHolder holder = null;
if(row == null) {
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new BookHolder();
holder.name2= (TextView)row.findViewById(R.id.cname);
//holder.eml2 = (TextView)row.findViewById(R.id.eml1);
holder.phn2 = (TextView)row.findViewById(R.id.cphno);
row.setTag(holder);
}
else {
holder = (BookHolder)row.getTag();
}
Newd book_detail = data[position];
holder.name2.setText(book_detail.name);
//holder.eml2.setText(book_detail.email);
holder.phn2.setText(String.valueOf(book_detail.phno));
System.out.println("name " + book_detail.name + "......." + book_detail.getName() + "name...." + "email " + "phoo" + book_detail.phno );
return row;
}
static class BookHolder {
TextView name2;
//TextView eml2;
TextView phn2;
}
}
对于列表活动：
public class Showdata extends Activity {
ListView lv;
String nms,emlss;
int phns,id11,id1;
Newd data1[]=null;
DataHelper dh;
SharedPreferences pref;
ArrayList<Newd>data=new ArrayList<Newd>();
public ArrayList<Integer>phone = new ArrayList<Integer>();
public ArrayList<String> name = new ArrayList<String>();
public ArrayList<String> email = new ArrayList<String>();
public ArrayList<Integer> userid = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.showdata);
dh=new DataHelper(getApplicationContext());
pref = getSharedPreferences("UID",
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putInt("ID", id1);
editor.commit();
System.out.println("id in intent " +id1);
//System.out.println("idssss" +id1);
dh.open();
data=dh.getdata();
dh.close();
System.out.println("data .." +data);
if(data.isEmpty()) {
}
else {
for (int i = 0; i < data.size(); i++) {
Newd r = data.get(i);
id11=r.getId();
nms=r.getName();
//emlss=r.getEmail();
phns= r.getPhno();
//total=r.getSeats();
System.out.println("list of booking dates ........" + nms+ "..........u iddd" +phns +"srno" +emlss);
userid.add(id11);
name.add(nms);
email.add(emlss);
phone.add(phns);
System.out.println("list of booking dates1 ........" + nms + "..........u iddd" + phns + "srno" + emlss);
}
data1=new Newd[name.size()];
for (int i = 0; i < name.size(); i++) {
// srn=srno.get(i);
int id2=userid.get(i);
String nm1=name.get(i);
String eml1=email.get(i);
int phn1=phone.get(i);
data1[i]=new Newd(id2,nm1, phn1);
System.out.println("srno...???" +id2);
}
}
lv=(ListView) findViewById(R.id.slist);
final CustomAdapter adapter=new CustomAdapter(Showdata.this, R.layout.custm, data1);
//lv.add
lv.setAdapter(adapter);
System.gc();
adapter.notifyDataSetChanged();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
// TODO Auto-generated method stub
//Cursor cr= (Cursor) parent.getItemAtPosition(position);
// updateList();
TextView t1=(TextView) findViewById(R.id.cname);
TextView t2=(TextView) findViewById(R.id.cphno);
// v=(View)parent.getItemAtPosition(position);
String unam=t1.getText().toString();
int phnu=Integer.valueOf(t2.getText().toString());
Intent it=new Intent(Showdata.this,UpdateData.class);
it.putExtra("unam",unam);
it.putExtra("phnu", phnu);
System.out.println("namesssss" +unam + "ph" +phnu);
startActivity(it);
// lv.getAdapter().noti
}
});
}
}
下一个活动：
public class UpdateData extends Activity {
Button update,delete;
EditText uname,uphn;
SharedPreferences pref;
DataHelper dh;
Cursor cr;
int idd;
CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.updatedata);
update=(Button) findViewById(R.id.usubmit);
delete=(Button) findViewById(R.id.uBack);
uname=(EditText) findViewById(R.id.uname);
uphn=(EditText) findViewById(R.id.uphono);
pref = getSharedPreferences("UID",
Context.MODE_PRIVATE);
idd=pref.getInt("ID", 0);
dh=new DataHelper(getApplicationContext());
Intent it=getIntent();
uname.setText(it.getStringExtra("unam"));
uphn.setText(String.valueOf(it.getIntExtra("phnu", 0)));
// System.out.println("getintent" +name);
update.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String unames=uname.getText().toString();
int uphns=Integer.valueOf(uphn.getText().toString());
dh.open();
dh.updateValues(idd,unames, uphns);
dh.close();
//updateList();
System.out.println("updateddd" +unames +";;;;;;;;;;;;" +uphns);
Intent up=new Intent(UpdateData.this,Showdata.class);
startActivity(up);
//adapter.notifyDataSetChanged();
}
});
}
}