我有一个显示交易列表的应用。当我点击一个按钮来获得第二天的交易时，列表视图仍然会附加前一天的交易。如何在getView重新填充之前清除数组或适配器？
我已经尝试过clear（）和adapter.notifyDataSetChanged（）但它仍然不起作用。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getrotalayout);
setCurrentDateOnView();
Log.e(TAG, "title = " + getTitle());
Log.e(TAG, "super.title = " + super.getTitle());
nfcscannerapplication = (NfcScannerApplication) getApplication();
date = nfcscannerapplication.getDate();
listView = (ListView) findViewById(R.id.rotalist);
intent = this.getIntent();
Bundle bundle = intent.getBundleExtra("rotaArrayBundle");
if(array != null){
array.clear();
}
array = (ArrayList<?>) bundle.get("rotaArray");
arrayAdapter = new MySimpleArrayAdapter(this, array);
arrayAdapter.notifyDataSetChanged();
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(this);
。[更新]
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getrotalayout);
setCurrentDateOnView();
Log.e(TAG, "title = " + getTitle());
Log.e(TAG, "super.title = " + super.getTitle());
nfcscannerapplication = (NfcScannerApplication) getApplication();
date = nfcscannerapplication.getDate();
listView = (ListView) findViewById(R.id.rotalist);
intent = this.getIntent();
Bundle bundle = intent.getBundleExtra("rotaArrayBundle");
array = (ArrayList<?>) bundle.get("rotaArray");
if (arrayAdapter == null){
arrayAdapter = new MySimpleArrayAdapter(this, array);
}else{
((MySimpleArrayAdapter)getListAdapter()).clear();
}
for(YourListItem item : yourNewDataArray){
((MySimpleArrayAdapter)getListAdapter()).add(item);
}
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(this);
}// end of onCreate
private MySimpleArrayAdapter getListAdapter() {
// TODO Auto-generated method stub
return arrayAdapter;
}
。 [UPDATE2]
public class GetRota extends NfcBaseActivity implements OnItemClickListener {
private static final String TAG = GetRota.class.getSimpleName();
ListView listView;
Intent intent;
String callID;
DateTime date;
NfcScannerApplication nfcscannerapplication;
ArrayList<?> array;
String needName = "";
MySimpleArrayAdapter arrayAdapter;
private DatePicker dpResult;
private int year;
private int month;
private int day;
static final int DATE_DIALOG_ID = 999;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getrotalayout);
setCurrentDateOnView();
Log.e(TAG, "title = " + getTitle());
Log.e(TAG, "super.title = " + super.getTitle());
nfcscannerapplication = (NfcScannerApplication) getApplication();
date = nfcscannerapplication.getDate();
listView = (ListView) findViewById(R.id.rotalist);
intent = this.getIntent();
Bundle bundle = intent.getBundleExtra("rotaArrayBundle");
array = (ArrayList<?>) bundle.get("rotaArray");
if (arrayAdapter == null){
arrayAdapter = new MySimpleArrayAdapter(this, array);
}else{
((MySimpleArrayAdapter)getListAdapter()).clear();
}
// for(YourListItem item : yourNewDataArray){
// ((MySimpleArrayAdapter)getListAdapter()).add(item);
// }
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(this);
}// end of onCreate
private MySimpleArrayAdapter getListAdapter() {
return arrayAdapter;
}
public void setCurrentDateOnView() {
dpResult = (DatePicker) findViewById(R.id.datepicker1);
final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menurotadetails, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.previous:
DateTime now2 = nfcscannerapplication.getDate();
Log.e(TAG, "now2 = " + now2);
DateTime dateTimePlusOne2 = now2.minusDays(1);
Log.e(TAG, "now2 after -1 = " + dateTimePlusOne2);
nfcscannerapplication.setDate(dateTimePlusOne2);
DateTimeFormatter fmt2 = DateTimeFormat.forPattern("d-MMM-Y");
String nextDay2 = fmt2.print(dateTimePlusOne2);
Intent i2 = new Intent(this, NfcscannerActivity.class);
i2.putExtra("nextRota", nextDay2);
i2.setAction("NEXT_ROTA");
startActivity(i2);
return true;
case R.id.next:
DateTime now = nfcscannerapplication.getDate();
Log.e(TAG, "now = " + now);
DateTime dateTimePlusOne = now.plusDays(1);
Log.e(TAG, "now after +1 = " + dateTimePlusOne);
nfcscannerapplication.setDate(dateTimePlusOne);
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String nextDay = fmt.print(dateTimePlusOne);
Intent i = new Intent(this, NfcscannerActivity.class);
i.putExtra("nextRota", nextDay);
i.setAction("NEXT_ROTA");
startActivity(i);
return true;
case R.id.today:
setCurrentDateOnView();
showDialog(DATE_DIALOG_ID);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
// set date picker as current date
return new DatePickerDialog(this, datePickerListener, year, month,
day);
}
return null;
}
private DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
// when dialog box is closed, below method will be called.
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
year = selectedYear;
month = selectedMonth;
day = selectedDay;
DateTime spinnyTime = new DateTime(year, month+1, day, 1, 1);
Log.e(TAG, "spinnyTime = " + spinnyTime);
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String formattedSpinnyTime = fmt.print(spinnyTime);
Log.e(TAG, "spinnyTime = " + formattedSpinnyTime);
Log.e(TAG, "year = " + year);
Log.e(TAG, "month = " + month);
Log.e(TAG, "day = " + day);
Intent i = new Intent(GetRota.this, NfcscannerActivity.class);
i.putExtra("nextRota", formattedSpinnyTime);
i.setAction("NEXT_ROTA");
startActivity(i);
}
};
private class MySimpleArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final ArrayList<?> list;
public MySimpleArrayAdapter(Context context, ArrayList<?> list) {
super(context, R.layout.rotarowlayout);
Log.e(TAG, "inside adapter constructor");
this.context = context;
this.list = list;
if(list.get(6).toString().equalsIgnoreCase("Out of range")){
AlertDialog alertDialog = new AlertDialog.Builder(GetRota.this).create();
alertDialog.setTitle("No Rota Available Error");
alertDialog.setMessage("Unable To View Rota For That Day");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
} });
alertDialog.show();
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.rotarowlayout, parent,
false);
TextView startTime = (TextView) rowView
.findViewById(R.id.rowstarttime);
TextView duration = (TextView) rowView
.findViewById(R.id.rowduration);
TextView status = (TextView) rowView.findViewById(R.id.rowstatus);
TextView name = (TextView) rowView.findViewById(R.id.rowclientname);
String record = list.get(position).toString();
String[] itemsInRecord = record.split(",");
Log.e(TAG, "itemin record = " + itemsInRecord.length);
String[] recordItem = new String[itemsInRecord.length];
for (int x = 0; x < itemsInRecord.length; x++) {
recordItem[x] = itemsInRecord[x];
Log.e(TAG, "x = " + x);
}
startTime.setText("Start Time: " + recordItem[0]);
duration.setText("Duration:" + recordItem[1]);
status.setText("Status:" + recordItem[2]);
name.setText("Client:" + recordItem[3] + recordItem[4]);
callID = recordItem[5];
needName = recordItem[6];
return rowView;
}
@Override
public int getCount() {
return this.list.size();
}
}// end of adapter class
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Log.e(TAG, "inside onItemClick");
Intent intent = new Intent(GetRota.this, GetRotaDetails.class);
intent.putExtra("callIDExtra", callID);
startActivity(intent);
}
}// end of GetRota
[UPDATE3]
@Override
protected void onNewIntent(Intent intent) {
setIntent(intent);
super.onNewIntent(intent);
// Get your ArrayList from getIntent.getExtras() here, and use my code from above
Bundle bundle = intent.getBundleExtra("rotaArrayBundle");
array = (ArrayList<?>) bundle.get("rotaArray");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getrotalayout);
setCurrentDateOnView();
Log.e(TAG, "title = " + getTitle());
Log.e(TAG, "super.title = " + super.getTitle());
nfcscannerapplication = (NfcScannerApplication) getApplication();
date = nfcscannerapplication.getDate();
listView = (ListView) findViewById(R.id.rotalist);
onNewIntent(intent);
//intent = this.getIntent();
//Bundle bundle = intent.getBundleExtra("rotaArrayBundle");
//array = (ArrayList<?>) bundle.get("rotaArray");
if (arrayAdapter == null){
arrayAdapter = new MySimpleArrayAdapter(this, array);
}else{
((MySimpleArrayAdapter)getListAdapter()).clear();
}
// for(YourListItem item : yourNewDataArray){
// ((MySimpleArrayAdapter)getListAdapter()).add(item);
// }
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(this);
}// end of onCreate
答案 0 :(得分：4)
您应该保留旧适配器，每当您想要更新列表时，您可以执行以下操作：
((MySimpleArrayAdapter)getListAdapter()).clear();
for(String[] item : array){
((MySimpleArrayAdapter)getListAdapter()).add(item);
}
您也不必致电notifyDataSetChange()，因为clear()和add()会为您做好准备。
编辑：在您的活动的清单XML中设置android:launchMode="singleTop"，然后覆盖onNewIntent()方法，如下所示：
@Override
protected void onNewIntent(Intent intent) {
setIntent(intent);
super.onNewIntent(intent);
}
<强> EDIT2：
@Override
protected void onNewIntent(Intent intent) {
setIntent(intent);
super.onNewIntent(intent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getrotalayout);
setCurrentDateOnView();
Log.e(TAG, "title = " + getTitle());
Log.e(TAG, "super.title = " + super.getTitle());
nfcscannerapplication = (NfcScannerApplication) getApplication();
date = nfcscannerapplication.getDate();
listView = (ListView) findViewById(R.id.rotalist);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(this);
}
@Override
protected void onResume(){
super.onResume();
ArrayList<String[]> array = (ArrayList<String[]>)getIntent().getBundleExtra("rotaArrayBundle").get("rotaArray");
MySimpleArrayAdapter arrayAdapter = new MySimpleArrayAdapter(this, array);
listView.setAdapter(arrayAdapter)
}
[更新4]
for(int i = 0; i < count; i++){
String s = new Integer(i).toString();
JSONObject jsonobject2 = (JSONObject) jsonObject1.get(s);
String startdate = jsonobject2.getString("StartDate");
String duration = jsonobject2.getString("Duration");
String callStatusName = jsonobject2.getString("CallStatusName");
String clientForeName = jsonobject2.getString("ClientForename");
String clientSurName = jsonobject2.getString("ClientSurname");
String clientCallId = jsonobject2.getString("CallID");
String needName = jsonobject2.getString("NeedName");
ArrayList<String> arr = new ArrayList<String>();
arr.add(startdate);
arr.add(duration);
arr.add(callStatusName);
arr.add(clientForeName);
arr.add(clientSurName);
arr.add(clientCallId);
arr.add(needName);
Log.e(TAG, "arr size = "+arr.size());
arrayList.add(i, arr);
}
} catch (Exception e) {
e.printStackTrace();
}
return arrayList;
class TwoDimentionalArrayList<T> extends ArrayList<ArrayList<T>> {
private static final long serialVersionUID = 1L;
public void addToInnerArray(int index, T element) {
while (index >= this.size()) {
this.add(new ArrayList<T>());
}
this.get(index).add(element);
}
public void addToInnerArray(int index, int index2, T element) {
while (index >= this.size()) {
this.add(new ArrayList<T>());
}
ArrayList<T> inner = this.get(index);
while (index2 >= inner.size()) {
inner.add(null);
}
inner.set(index2, element);
}
}
答案 1 :(得分：0)
请您尝试更改订单。
listView.setAdapter(arrayAdapter);
arrayAdapter.notifyDataSetChanged();