我有arraylist和所有数据nulldate和日期添加在一个数组列表中。我在列表视图中显示所有数据。但我的问题是我先得到nulldate和最后的可用日期我想在可用日期之前使日期数据为空。我想排序可用日期和空日期数据没有排序，只是在add.please列表视图帮助我.... !!!!!!!!!!!
public class Approval extends Activity {
protected static final All_Approval_data_dto All_Approval_data_dto = null;
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
list.clear();
}
private String assosiatetoken;
ArrayList<All_Approval_data_dto> list = new ArrayList<All_Approval_data_dto>();
ArrayList<All_Approval_Key_dto> alist = new ArrayList<All_Approval_Key_dto>();
ArrayList<String> catState = new ArrayList<String>();
ArrayList<String> uniCatState = new ArrayList<String>();
ArrayList<ArrayList<All_Approval_data_dto>> masterState = new ArrayList<ArrayList<All_Approval_data_dto>>();
private String req_id;
ListView lv;
Button back;
ExpAdapter1 expAdapter;
private Spinner spndata;
String[] reqspinner = { "Request Date", "Last Update", "Submitter",
"Owner", "State" };
ArrayAdapter<String> adapter;
private ExpandableListView exlistView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.approval);
assosiatetoken = MyApplication.getToken();
alist = DBAdpter.recursUserData(assosiatetoken);
for (int i = 0; i < alist.size(); i++) {
req_id = alist.get(i).requestId;
list = DBAdpter.approvalUserData(assosiatetoken, req_id);
}
// setState();
new doinbackground(this).execute();
spndata = (Spinner) findViewById(R.id.list_all_quize);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, reqspinner);
spndata.setAdapter(adapter);
lv = (ListView) findViewById(R.id.listapprovaldata);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
Intent edit = new Intent(Approval.this, Approval_webview.class);
// edit.putExtra("Cat_url", url_link);
startActivity(edit);
}
});
exlistView = (ExpandableListView) findViewById(R.id.ExpList);
spndata.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
switch (position) {
case 0:
lv.setVisibility(View.VISIBLE);
exlistView.setVisibility(View.GONE);
Collections.sort(list, byDate);
for (int i = 0; i < list.size(); i++) {
Log.v("log_tag", "Data " + list.get(i).lastModifiedDate);
if (list.get(i).lastModifiedDate != null) {
Log.v("log_tag", "sorting "
+ list.get(i).lastModifiedDate);
lv.setAdapter(new MyListAdapter(
getApplicationContext(), list));
}
}
break;
case 1:
lv.setVisibility(View.VISIBLE);
exlistView.setVisibility(View.GONE);
Collections.sort(list, byDate1);
for (int i = 0; i < list.size(); i++) {
if (list.get(i).state != null) {
lv.setAdapter(new MyListAdapter(
getApplicationContext(), list));
}
}
break;
case 2:
break;
case 3:
break;
default:
break;
}
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
static final Comparator<All_Approval_data_dto> byDate = new Comparator<All_Approval_data_dto>() {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");
@SuppressWarnings("unused")
public int compare(All_Approval_data_dto ord1,
All_Approval_data_dto ord2) {
java.util.Date d1 = null;
java.util.Date d2 = null;
try {
if (d1 == null) {
return (d2 == null) ? 0 : -1;
} else if (d2 == null) {
return 1;
}
d1 = sdf.parse(ord1.lastModifiedDate);
d2 = sdf.parse(ord2.lastModifiedDate);
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block`
e.printStackTrace();
}
// return (d1.compareTo(d2) > 0 ? 1 : -1);
return (d1.getTime() > d2.getTime() ? -1 : 1); // descending
}
};
/*
* static final Comparator<AnalysisDto> byRatio = new
* Comparator<AnalysisDto>() {
*
*
* public int compare(Date date1, Date date2) { return
* (date1.compareTo(date2)>0 ? 1 : -1); } };
*/
static final Comparator<All_Approval_data_dto> byDate1 = new Comparator<All_Approval_data_dto>() {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");
@SuppressWarnings("unused")
public int compare(All_Approval_data_dto ord1,
All_Approval_data_dto ord2) {
java.util.Date d1 = null;
java.util.Date d2 = null;
try {
if (d1 == null) {
return (d2 == null) ? 0 : -1;
} else if (d2 == null) {
return 1;
}
d1 = sdf.parse(ord1.submitDate);
d2 = sdf.parse(ord2.submitDate);
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block`
e.printStackTrace();
}
// return (d1.compareTo(d2) > 0 ? 1 : -1);
return (d1.getTime() > d2.getTime() ? -1 : 1); // descending
// return (d1.getTime() > d2.getTime() ? 1 : -1); //ascending
}
};
class doinbackground extends AsyncTask<Void, Void, Void> {
ProgressDialog pd;
private Context ctx;
public doinbackground(Context c) {
ctx = c;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(ctx);
pd.setMessage("Loading...");
pd.show();
}
@Override
protected Void doInBackground(Void... params) {
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
pd.cancel();
}
}
public class MyListAdapter extends BaseAdapter {
private ArrayList<All_Approval_data_dto> list;
public MyListAdapter(Context mContext,
ArrayList<All_Approval_data_dto> list) {
this.list = list;
}
public int getCount() {
return list.size();
}
public All_Approval_data_dto getItem(int position) {
return list.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflator = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
convertView = inflator.inflate(R.layout.custom_approval_data, null);
TextView req_id = (TextView) convertView.findViewById(R.id.req_txt);
TextView date = (TextView) convertView.findViewById(R.id.date_txt);
TextView owner = (TextView) convertView
.findViewById(R.id.owner_txt);
TextView state = (TextView) convertView
.findViewById(R.id.state_txt);
req_id.setText(list.get(position).requestId + " - "
+ list.get(position).title);
date.setText(list.get(position).lastModifiedDate + " - "
+ list.get(position).submitDate);
owner.setText(list.get(position).submitter);
state.setText(list.get(position).state);
return convertView;
}
}
}
答案 0 :(得分：0)
尝试使用您的数据并按升序或降序进行管理
答案 1 :(得分：0)
用这个
替换你的try / catch块 try {
if (ord1 == null) {
return (ord2 == null) ? 0 : 1;
} else if (ord2 == null) {
return -1;
}
d1 = sdf.parse(ord1.lastModifiedDate);
d2 = sdf.parse(ord2.lastModifiedDate);
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block`
e.printStackTrace();
}