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我是android的noob，我無法用自定義適配器實現listview。我的適配器行的佈局由一個imageview，文本和兩個按鈕組成。這兩個按鈕對應於填充該特定行的數據。當列表視圖最初加載時，一切都很好，因爲這些按鈕對應於它們的特定行。但是，滾動後，特定按鈕不再與該行中列出的數據相對應。例如，在滾動之前，如果我單擊第5行中的某個按鈕，它將返回第5行，但在滾動後，如果我單擊第20行中的某個按鈕，它將返回第3行。任何解決此問題的幫助都將不勝感激。爲什麼ListView適配器在滾動後失去位置？
MY適配器類
public class MyAppointments_ListAdapter extends BaseAdapter implements OnClickListener {
private ArrayList<HashMap<String, String>> listData;
private LayoutInflater layoutInflater;
Context c;
AlertDialog alert;
int selection;
String responce_for_push = null;
URL push_message = null;
public static String adapter_email;
public MyAppointments_ListAdapter(Context context, ArrayList listData) {
this.listData = listData;
layoutInflater = LayoutInflater.from(context);
c = context;
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return listData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.layout_row_myappointments, null);
holder = new ViewHolder();
holder.userAvatar = (ImageView) convertView.findViewById(R.id.client_image);
holder.userName = (TextView) convertView.findViewById(R.id.username);
holder.userStatus = (TextView) convertView.findViewById(R.id.status);
holder.userTime = (TextView) convertView.findViewById(R.id.time);
holder.profile = (ImageButton) convertView.findViewById(R.id.profile);
holder.profile.setOnClickListener(MyAppointments_ListAdapter.this);
holder.profile.setTag(position);
holder.cancel = (ImageButton) convertView.findViewById(R.id.cancel);
holder.cancel.setOnClickListener(MyAppointments_ListAdapter.this);
holder.cancel.setTag(position);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if(LandingActivity.user_isClient){
holder.userName.setText((listData.get(position)).get("Barber_Username"));
}else{
holder.userName.setText((listData.get(position)).get("Username"));
}
if((listData.get(position)).get("Status").equals("PENDING")){
holder.userStatus.setText("Appointment Pending.");
}else{
holder.userStatus.setText("Appointment Confirmed.");
}
holder.userTime.setText((listData.get(position)).get("Time"));
int loader = R.drawable.app_icon;
if(LandingActivity.user_isClient){
String profilepicURL = "http://184.107.149.234/KutTime/clients/"+(listData.get(position)).get("Email")+"/profile.jpg";
// ImageLoader class instance
ImageLoader imgLoader = new ImageLoader(c);
imgLoader.DisplayImage(profilepicURL, loader, holder.userAvatar);
}else{
String profilepicURL = "http://184.107.149.234/KutTime/clients/"+(listData.get(position)).get("Client_Email")+"/profile.jpg";
// ImageLoader class instance
ImageLoader imgLoader = new ImageLoader(c);
imgLoader.DisplayImage(profilepicURL, loader, holder.userAvatar);
}
return convertView;
}
static class ViewHolder {
ImageView userAvatar;
TextView userName;
TextView userStatus;
TextView userTime;
ImageButton profile;
ImageButton cancel;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.profile:
selection = (Integer)v.getTag();
Log.e("Selection", String.valueOf(selection));
if(LandingActivity.user_isClient){
adapter_email = (listData.get(selection)).get("Email");
Log.e("Adapter Email", adapter_email);
Intent myIntent = new Intent("com.tpssquared.kuttime.PROFILE_BARBER_VIEW");
myIntent.putExtra("ADAPTER_EMAIL", adapter_email);
c.startActivity(myIntent);
}else{
adapter_email = (listData.get(selection)).get("Client_Email");
Log.e("Adapter Email", adapter_email);
Intent myIntent = new Intent("com.tpssquared.kuttime.PROFILE_CLIENT_VIEW");
myIntent.putExtra("ADAPTER_EMAIL", adapter_email);
c.startActivity(myIntent);
}
break;
case R.id.cancel:
selection = (Integer)v.getTag();
AlertDialog.Builder builder = new AlertDialog.Builder(c);
builder.setTitle("Cancel Appointment");
if(LandingActivity.user_isClient){
builder.setMessage("Cancel appointment with " + (listData.get((Integer)v.getTag())).get("Username") + " at " + (listData.get((Integer)v.getTag())).get("Time") );
}else{
builder.setMessage("Cancel appointment with " + (listData.get((Integer)v.getTag())).get("Barber_Username") + " at " + (listData.get((Integer)v.getTag())).get("Time") );
}
builder.setNegativeButton("No",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
alert.dismiss();
}
});
builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
cancelAppointment();
}
});
alert = builder.create();
alert.show();
break;
}
}
感謝響應。我如何以及在哪裏實施？我是否在convertView之外編寫另一種方法？ – DollaBill
更新了我的答案 – user2729200