您好我正在使用具有自定义列表视图的Android应用程序。列表视图中的项目大约为3000.我的问题是在滚动后加载项目会导致outOfMemory Error。
我正在使用Base Adapter，每个项目都有一个Checkbox和四个textview。
这是我的代码。请让我知道解决方案。
public class GuestListAdapter extends BaseAdapter implements OnClickListener {
private String strExe;
AlertDialog.Builder builder;
String sId;
String sCheckIn;
String strCheckInResponse;
Context context;
private ArrayList<String> arrayListId;
private ArrayList<String> arrayListFirstName;
private ArrayList<String> arrayListLastName;
private ArrayList<String> arrayListGuests;
private ArrayList<String> arrayCustomOne;
private ArrayList<String> arTempId;
public static ArrayList<Boolean> chickinlist;
public static ArrayList<Integer> arrCheckedItems;
public static ArrayList<Integer> arrUnCheckedItems;
Button btnInfo;
private SQLiteAdapter mySqliteAdapter;
private GuestListScreen myGuestList;
private RelativeLayout views;
private String strAlertValue;
// private AlertDialog alertDialog = null;
private ArrayList<Boolean> checks = new ArrayList<Boolean>();
public GuestListAdapter(Context mcontext, ArrayList<String> arrListid,
ArrayList<String> arrListFN, ArrayList<String> arrListLN,
ArrayList<String> arrListGuest, ArrayList<String> arrTiketID,
ArrayList<String> arrCustOne, ArrayList<Boolean> chicklist) {
clearAdapter();
arrayListId = new ArrayList<String>();
arrayListFirstName = new ArrayList<String>();
arrayListLastName = new ArrayList<String>();
arrayListGuests = new ArrayList<String>();
arrayCustomOne = new ArrayList<String>();
arTempId = new ArrayList<String>();
chickinlist = new ArrayList<Boolean>();
arrCheckedItems = new ArrayList<Integer>();
arrUnCheckedItems = new ArrayList<Integer>();
arrayListId = arrListid;
arrayListFirstName = arrListFN;
arrayListLastName = arrListLN;
arrayListGuests = arrListGuest;
arrayCustomOne = arrCustOne;
arTempId = arrTiketID;
chickinlist = chicklist;
context = mcontext;
mySqliteAdapter = new SQLiteAdapter(context);
for (int i = 0; i < arrayListFirstName.size(); i++) {
checks.add(i, false);
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return arrayListFirstName.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return arrayListFirstName.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View view, ViewGroup parent) {
final int pos = position;
views = null;
LayoutInflater layoutInflator = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
views = (RelativeLayout) layoutInflator.inflate(
R.layout.guest_list_item, null);
final CheckBox chk = (CheckBox) views.getChildAt(0);
// Log.d("", "CheckBox Pos "+position);
chk.setId(position);
TextView txtView = (TextView) views.getChildAt(1);
TextView txtView2 = (TextView) views.getChildAt(2);
TextView txtView3 = (TextView) views.getChildAt(3);
final TextView txtView4 = (TextView) views.getChildAt(4);
TextView txtView5 = (TextView) views.getChildAt(6);
txtView5.setId(position);
// Log.d("", "Button Pos "+position);
txtView4.setId(position);
txtView4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context, InfoScreen.class);
intent.putExtra("IDVALUE", arTempId.get(txtView4.getId()));
intent.putExtra("IDVALUE", arrayListId.get(position));
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
context.startActivity(intent);
}
});
for (int dd = 0; dd < arrayListFirstName.size(); dd++) {
if (position == dd) {
// Log.d("", "Passsing arr size " + chickinlist.size());
Boolean result = chickinlist.get(position);
// Log.d("", "After " + result);
if (result == true) {
chk.setChecked(true);
arrCheckedItems.add(position);
views.setBackgroundResource(R.drawable.list_item_checked);
} else {
chk.setChecked(false);
arrUnCheckedItems.add(position);
views.setBackgroundResource(R.drawable.list_item_unchecked);
}
txtView.setText(arrayListFirstName.get(position));
txtView2.setText(arrayListLastName.get(position));
txtView3.setText("(" + arrayListGuests.get(position) + ")");
if (arrayCustomOne.get(position).equalsIgnoreCase("0")
|| arrayCustomOne.get(position).equalsIgnoreCase(null)
|| arrayCustomOne.get(position).equalsIgnoreCase(
"(null)")) {
txtView5.setText("");
} else {
txtView5.setText(arrayCustomOne.get(position));
}
}
}
chk.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
mySqliteAdapter.openToWrite();
sId = arrayListId.get(chk.getId());
// Log.d("Adapter",
// "Checked Temp Id "+arTempId.get(chk.getId()));
if (isChecked) {
chk.setChecked(true);
arrCheckedItems.add(position);
strAlertValue = "1";
sCheckIn = "1";
strExe = "update ticket_details set checkin_status=1 where tempid="
+ arTempId.get(chk.getId());
mySqliteAdapter.executeCheckQurey(strExe);
if (Util.getInstance(context).isTabletDevice()) {
buttonView
.setBackgroundResource(R.drawable.tablet_list_item_check);
Log.e("Tablet", "Tablet Checked ");
} else {
buttonView
.setBackgroundResource(R.drawable.list_item_checked);
Log.e("Device", "Device Checked ");
}
new CheckInUpdate().execute();
AlertDialog.Builder builder = new AlertDialog.Builder(
context);
builder.create();
builder.setMessage(arrayListFirstName.get(chk.getId())
+ " " + arrayListLastName.get(chk.getId())
+ " has been checked in.");
builder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Intent intentNavGuestList = new Intent(
context, GuestListScreen.class);
intentNavGuestList
.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
context.startActivity(intentNavGuestList);
dialog.dismiss();
}
}).show();
// Log.d("", "ID = " + buttonView.getId());
}
if (!isChecked) {
sCheckIn = "0";
strAlertValue = "0";
strExe = "update ticket_details set checkin_status=0 where tempid="
+ arTempId.get(chk.getId());
mySqliteAdapter.executeCheckQurey(strExe);
if (Util.getInstance(context).isTabletDevice()) {
buttonView
.setBackgroundResource(R.drawable.tablet_list_item_uncheck);
Log.e("Tablet", "Tablet UnChecked ");
} else {
buttonView
.setBackgroundResource(R.drawable.list_item_unchecked);
Log.e("Device", "Device UnChecked ");
}
new CheckInUpdate().execute();
Intent intentNavGuestList = new Intent(context,
GuestListScreen.class);
intentNavGuestList
.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
context.startActivity(intentNavGuestList);
}
}
});
return views;
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
Integer index = (Integer) view.getTag();
boolean state = checks.get(index.intValue());
checks.set(index.intValue(), !state);
}
public void clearAdapter() {
if (arrayListFirstName != null) {
arrayListFirstName.clear();
arrayListId.clear();
arrayListId = null;
arrayListFirstName = null;
arrayListLastName.clear();
arrayListLastName = null;
arrayListGuests.clear();
arrayListGuests = null;
arrayCustomOne.clear();
arrayCustomOne = null;
arTempId.clear();
arTempId = null;
chickinlist.clear();
chickinlist = null;
arrCheckedItems.clear();
arrCheckedItems = null;
arrUnCheckedItems.clear();
arrUnCheckedItems = null;
}
}
}
我也尝试使用View Holder，但仍然加载缓慢。请告诉解决方案如何解决这个问题。
答案 0 :(得分：0)
view来自View getView(final int position, Vie view, ViewGroup parent)的参数，如果它不为空，那么您不需要再次充气。loop for (int dd = 0; dd < arrayListFirstName.size(); dd++)
arrayListFirstName.size()可以简化（例如，使用某个变量来避免size()次来电）getView()）另外，请查看this video from Google I/O以获取有关如何以正确方式制作ListView的更多详细信息。