我在android中遇到了listview的问题。我有一个带有 3 个文本视图和一个按钮的自定义适配器，其文本根据服务器的响应而变化。实际上，我的应用程序中有搜索朋友的功能，因此列表显示每个用户及其按钮文本上的状态。就像如果已经是朋友，那么按钮文本是朋友并且按钮被禁用。否则添加朋友，并且按钮启用。单击“添加朋友”按钮后，按钮文本更改为“请求已发送”。但问题是，当我单击其他一些按钮的按钮文本时，滚动也会发生变化。请帮我。如果需要，我会放代码。
这是我的适配器类：
class ListViewCustomAdapter extends BaseAdapter {
private static final String REQUEST = "Request";
private static final String ACCEPT = "Accepted";
private static final String RECEIVE = "Receive";
private Activity context;
private ArrayList<FriendList> friendList;
private SessionManager sessionManager;
private String authToken;
private ProgressDialog progressDialog;
ViewHolder mViewHolder;
private HashMap<Integer, String> buttonTextMap;
public ListViewCustomAdapter(Activity activity,
ArrayList<FriendList> _friendList) {
this.context = activity;
this.friendList = _friendList;
sessionManager = new SessionManager(context);
authToken = sessionManager.getAuthorizationKey();
buttonTextMap = new HashMap<Integer, String>();
}
public int getCount() {
// TODO Auto-generated method stub
return friendList.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return friendList.get(position);
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = layoutInflater.inflate(
R.layout.friend_list_view_item, null);
mViewHolder = new ViewHolder();
mViewHolder.profilePicture = (ImageView) convertView
.findViewById(R.id.friendPicureImageView);
mViewHolder.friendName = (TextView) convertView
.findViewById(R.id.firstNameTextView);
mViewHolder.email = (TextView) convertView
.findViewById(R.id.emailTextView);
mViewHolder.gender = (TextView) convertView
.findViewById(R.id.genderTextView);
mViewHolder.addButton = (Button) convertView
.findViewById(R.id.addFriendButton);
convertView.setTag(mViewHolder);
} else {
mViewHolder = (ViewHolder) convertView.getTag();
}
byte[] imageByteArray = Base64.decode(friendList.get(position)
.getFriendProfilePic(), Base64.DEFAULT);
mViewHolder.profilePicture.setImageBitmap(BitmapFactory
.decodeByteArray(imageByteArray, 0, imageByteArray.length));
if (friendList.get(position).getFriendFirstName()
.equalsIgnoreCase("null")) {
mViewHolder.friendName.setText(friendList.get(position)
.getFriendLastName());
} else if (friendList.get(position).getFriendLastName()
.equalsIgnoreCase("null")) {
mViewHolder.friendName.setText(friendList.get(position)
.getFriendFirstName());
} else if (friendList.get(position).getFriendLastName()
.equalsIgnoreCase("null")
&& friendList.get(position).getFriendFirstName()
.equalsIgnoreCase("null")) {
mViewHolder.friendName.setText("No Name");
} else {
mViewHolder.friendName.setText(friendList.get(position)
.getFriendFirstName()
+ " "
+ friendList.get(position).getFriendLastName());
}
if (!friendList.get(position).getFriendEmail().equalsIgnoreCase("null")) {
mViewHolder.email
.setText(friendList.get(position).getFriendEmail());
}
if (!friendList.get(position).getFriendGender()
.equalsIgnoreCase("null")) {
if (friendList.get(position).getFriendGender()
.equalsIgnoreCase(Constants.MALE))
mViewHolder.gender.setText(Constants.SET_MALE);
else if (friendList.get(position).getFriendGender()
.equalsIgnoreCase(Constants.FEMALE)) {
mViewHolder.gender.setText(Constants.SET_FEMALE);
}
}
if (friendList.get(position).getFriendRequestStatus()
.equalsIgnoreCase(REQUEST)) {
/*
* buttonTextMap.put(position, "Request sent");
* buttonActiveStateMap.put(position, false);
*/
mViewHolder.addButton.setText("Request Sent");
mViewHolder.addButton.setEnabled(false);
} else if (friendList.get(position).getFriendRequestStatus()
.equalsIgnoreCase(ACCEPT)) {
/*
* buttonTextMap.put(position, "Add friend");
* buttonActiveStateMap.put(position, true);
*/
mViewHolder.addButton.setText("Friend");
mViewHolder.addButton.setEnabled(false);
} else if (friendList.get(position).getFriendRequestStatus()
.equalsIgnoreCase(RECEIVE)) {
/*
* buttonTextMap.put(position, "Add friend");
* buttonActiveStateMap.put(position, true);
*/
mViewHolder.addButton.setText("Accept");
mViewHolder.addButton.setEnabled(true);
}
buttonTextMap.put(position, mViewHolder.addButton.getText().toString());
Log.d("FriendList", "position in getview===== " + position);
mViewHolder.addButton.setTag(position);
mViewHolder.addButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
int which = -1;
Object obj = v.getTag();
if(obj instanceof Integer){
which = ((Integer)obj).intValue();
Log.e("FriendListActivity", "position button 1 ======= "+which);
}
if(which >-1){
Log.e("FriendListActivity", "position button 2======= "+which);
}
Button button = (Button) FriendListActivity.listView.getChildAt(which).findViewById(R.id.addFriendButton);
//Button button = (Button) v;
if (button.getText().toString().equalsIgnoreCase("Accept")) {
Intent intent = new Intent(context,
NotificationsActivity.class);
context.startActivity(intent);
context.finish();
} else {
int id = button.getId();
addFriend(button, friendList.get(position)
.getFriendUserId(),which);
}
}
});
return convertView;
}
static class ViewHolder {
TextView friendName;
TextView email;
TextView gender;
ImageView profilePicture;
Button addButton;
}
private void addFriend(final Button _button, final String userId,
final int _position) {
final JSONObject jsonObject = new JSONObject();
Log.e("FriendListActivity", "position in addFriend=== " + _position);
try {
jsonObject.put("authToken", authToken);
jsonObject.put("targetFriendId", userId);
jsonObject.put("requestType", "FriendRequest");
jsonObject.put("status", "Requested");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
progressDialog.dismiss();
if (msg.what == 1) {
_button.setText("Request sent");
_button.setEnabled(false);
Toast.makeText(context, "Request sent successfully.",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context, "Request unsuccessfull.",
Toast.LENGTH_LONG).show();
}
}
};
progressDialog = ProgressDialog.show(context, "", "Loading...");
new Thread() {
@Override
public void run() {
String response = DoFriendRequest
.makeHttpPostRequest(jsonObject);
Message message = new Message();
if (response != null) {
message.what = 1;
handler.sendEmptyMessage(message.what);
} else {
handler.sendEmptyMessage(0);
}
}
}.start();
}