我有一个listview，其中有一个按钮，在单击按钮（来自CustomListAdapter类）的特定行上，它将值插入数据库并显示该特定行的值。它插入值但不显示值或不刷新。 所以我使用了这段代码
public class CustomListAdapter2 extends BaseAdapter {
List<HashMap<String, Object>> models,mList;
Context context;
LayoutInflater inflater;
URL urll;
HttpURLConnection connection;
InputStream input;
ViewHolder viewHolder;
//UI for Locations
ImageView pic,image,delam;
TextView name,timestamp,msg,url,idas,idas2,emasr,cn;
ArrayList<String> listItems;
ListView lv;
public int count1 = 0;
ProgressDialog pDialog;
//String session_email="",session_type="",share_app,share_via;
private String stringVal;
private int mCounter1=1;
private int counter=0;
public int temp=0;
String con, pros;
private int[] counters;
int pos;
int width,height;
int position2;
String id,emm;
Transformation transformation;
//ImageButton sharingButton;
String pacm,session_email,session_ph,session_type,session_loc,connter;
ArrayList<HashMap<String, Object>> usersList,usersList1;
JSONParser jParser = new JSONParser();
int i ;
Parcelable state;
JSONParser jsonParser = new JSONParser();
static String IP = IpAddress.Ip;
private String imagePath = IP+"/upload/";
//url to create new product
public static String add_wish = IP+"/studio/add_wishlist.php";
private static String url_all_properties5 = IP+"/social/get_all_agen_like.php";
private static String url_all_properties1 = IP+"/social/get_lik_coun.php";
private static String url_all_properties6 = IP+"/social/get_all_agen_like3.php";
private static String url_all_properties7 = IP+"/social/get_all_dele_like.php";
private static String url_all_properties8 = IP+"/social/get_all_dele_uplike.php";
private static String url_all_propertiesdel = IP+"/social/getdelete_all_agent.php";
boolean isSelected;
int a,a1,b,b1;
//private static final String TAG_SUCCESS1 = "mass";
private static final String TAG_USER = "users";
private static final String TAG_PRO = "properties";
//private static final String TAG_PRO1 = "properties1";
// products JSONArray
JSONArray users = null;
//JSONArray users1 = null;
View view;
// JSON Node names
private static final String TAG_SUCCESS = "success";
SharedPreferences sPref;
// int position;
public CustomListAdapter2(Context context, List<HashMap<String, Object>> models) {
this.context = context;
this. models = models;
inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.counters = new int[30];
mList = models;
//this.session_email = sPref.getString("SESSION_UID","");
}
public class ViewHolder {
public TextView countt,idas5,emasr,cn,idas;
// public String id,emm;
public ImageView like,image,imageViewOne;
public ImageView share,share2;
}
public void clear(){
if(models!=null)
models.clear();
}
@Override
public int getCount() {
return models.size();
}
public HashMap<String, Object> getItem(int position) {
return models.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 1;
}
@Override
public View getView( final int position, final View convertView, ViewGroup parent) {
// view = null;
view = convertView;
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
sPref= context.getSharedPreferences("REAL", Context.MODE_PRIVATE);
session_email = sPref.getString("SESSION_UID","");
session_ph = sPref.getString("SESSION_PH","");
session_type = sPref.getString("SESSION_TYPE", "");
session_loc = sPref.getString("SESSION_LOC", "");
ConnectionDetector cd = new ConnectionDetector(context);
Boolean isInternetPresent = cd.isConnectingToInternet(); // true or false
if (isInternetPresent) {
// Internet Connection is Present
// make HTTP requests
// Toast.makeText(context, "Connected", Toast.LENGTH_LONG).show();
// new LoadAllProducts().execute();
} else if (!isInternetPresent) {
// Internet connection is not present
// Ask user to connect to Internet
// Toast.makeText(getActivity(), "Please Check your Internet connection", Toast.LENGTH_LONG).show();
removeItemFromList1();
}
// lv=(ListView)view.findViewById(R.id.list);
pos = getItemViewType(position);
// long posn = getItemId(position);
// final int paps= (int)posn ;
if (view == null) {
viewHolder = new ViewHolder();
view = inflater.inflate(R.layout.fragment_home2, parent, false);
//your code
cn = (TextView) view.findViewById(R.id.count);
viewHolder.image = (ImageView) view.findViewById(R.id.feedImage1);
//add below code after (end of) your code
viewHolder.idas5 = (TextView) view.findViewById(R.id.hpid);
viewHolder. emasr= (TextView) view.findViewById(R.id.ema);
viewHolder.like=(ImageView)view.findViewById(R.id.likem);
viewHolder.share=(ImageView)view.findViewById(R.id.sharemsp);
viewHolder.share2=(ImageView)view.findViewById(R.id.plu);
viewHolder.cn = (TextView) view.findViewById(R.id.count);
viewHolder.imageViewOne = (ImageView) view.findViewById(R.id.feedImage1);
viewHolder.imageViewOne.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
HashMap<String, Object> item = models.get(position);
// viewHolder.idas = (TextView) view.findViewById(R.id.hpid);
idas.setText((CharSequence) item.get("UIDAS"));
// pacm= viewHolder.idas.getText().toString();
pacm= idas.getText().toString();
// pacm = ((TextView) v.findViewById(R.id.hpid)).getText().toString();
Intent intent=new Intent(context, Profile1.class);
intent.putExtra("ACAM",pacm);
context.startActivity(intent);
//((Activity) context).finish();
//notifyDataSetChanged();
}
});
viewHolder.imageViewOne.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
int position = (Integer) v.getTag();
HashMap<String, Object> item = models.get(position);
idas.setText((CharSequence) item.get("UIDAS"));
pacm= idas.getText().toString();
removeItemFromList();
return true;
}
});
// viewHolder.share.setOnItemClickListener(this);
viewHolder.like.setBackgroundResource(R.drawable.like1);
viewHolder.like.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
// viewHolder.countt = (TextView) v.findViewById(R.id.count);
HashMap<String, Object> item = models.get(position);
viewHolder.idas5.setText((CharSequence) item.get("UIDAS"));
// id=(String) viewHolder.idas5.getText();
viewHolder.emasr.setText((CharSequence) item.get("EMAILM"));
id=(String) viewHolder.idas5.getText();
emm=(String) viewHolder.emasr.getText();
new LoadAllProducts().execute();
new LoadAllProducts22().execute();
notifyDataSetChanged();
}
});
view.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) view.getTag();
}
viewHolder.imageViewOne.setTag(position);
viewHolder.like.setTag(position);
viewHolder.share.setTag(position);
viewHolder.share2.setTag(position);
viewHolder.cn.setTag(position);
final HashMap<String, Object> item = getItem(position);
pic = (ImageView) view.findViewById(R.id.profilePic);
name = (TextView) view.findViewById(R.id.name);
idas = (TextView) view.findViewById(R.id.hpid);
idas2 = (TextView) view.findViewById(R.id.hpid2);
timestamp = (TextView) view.findViewById(R.id.timestamp);
// Typeface tf = Typeface.createFromAsset(context.getAssets(),"fonts/NotoSansMalayalam-Regular.ttf");
msg = (TextView) view.findViewById(R.id.txtStatusMsg);
// msg.setTypeface(tf);
url = (TextView) view.findViewById(R.id.txtUrl);
image = (ImageView) view.findViewById(R.id.feedImage1);
idas.setText((CharSequence) item.get("UIDAS"));
cn.setText((CharSequence) item.get("COUN"));
// listItems.add(idas.getText().toString());
name.setText((CharSequence) item.get("NAME"));
timestamp.setText((CharSequence) item.get("TIME"));
msg.setText((CharSequence) item.get("MSG"));
url.setText((CharSequence) item.get("URL"));
Picasso.with(context)
//.load("PIC")
.load((String)item.get("PIC"))
.placeholder(R.drawable.profile_dummy)
//.error(R.drawable.ic_whats_hot)
.resize(50, 50)
// .centerCrop()
// .fit()
.into(pic);
/*Display display = getActivity().getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;*/
Picasso.with(context)
.load((String)item.get("IMAGE"))
//.load("IMAGE")
// .placeholder(R.drawable.ic_pages)
//.error(R.drawable.ic_home)
// .resize(1000,b1)
// .onlyScaleDown()
//.centerCrop()
// .fit().centerInside()
.into(image);
return view;
}
protected ContentResolver getContentResolver() {
// TODO Auto-generated method stub
return null;
}
static boolean isAirplaneModeOn(Context context) {
ContentResolver contentResolver = context.getContentResolver();
return Settings.System.getInt(contentResolver, AIRPLANE_MODE_ON, 0) != 0;
}
public void removeItemFromList() {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Delete");
alertDialog.setMessage("Do you want delete this item?");
alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
new CreateNewUser().execute();
}
});
alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}
//这是点击工作的类，我想刷新值
class LoadAllProducts extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
/*pDialog = new ProgressDialog(context);
pDialog.setMessage("Loading.. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
*/
/*Runnable progressRunnable = new Runnable() {
@Override
public void run() {
pDialog.cancel();
}
};
Handler pdCanceller = new Handler();
pdCanceller.postDelayed(progressRunnable, 3000);*/
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
// session_email = sPref.getString("SESSION_UID","");
usersList = new ArrayList<HashMap<String, Object>>();
//usersList1 = new ArrayList<HashMap<String, Object>>();
// cn = (TextView) view.findViewById(R.id.count);
// id=(String) viewHolder.idas5.getText();
((Activity) context).runOnUiThread(new Runnable() {
@Override
public void run() {
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("email", session_email));
params.add(new BasicNameValuePair("loc", "liked"));
params.add(new BasicNameValuePair("con", "1"));
params.add(new BasicNameValuePair("idtes", id));
params.add(new BasicNameValuePair("emas", emm));
JSONObject json = jParser.makeHttpRequest(url_all_properties5, "GET", params);
if (json != null) {
// Check your log cat for JSON reponse
Log.d("All start: ", json.toString());
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success== 1) {
Log.d("Inside success...", json.toString());
connter = json.getString("loca");
//cn.setText(connter);
Intent intent = ((Activity) context).getIntent();
// state = ((Dialog) mList).onSaveInstanceState();
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
sPref.edit().putString("SESSION_UID", session_email).commit();
sPref.edit().putString("SESSION_TYPE", session_type).commit();
sPref.edit().putString("SESSION_PH", session_ph).commit();
sPref.edit().putString("SESSION_LOC", session_loc).commit();
((Activity) context).finish();
((Activity) context).overridePendingTransition(0, 0);
((Activity) context).startActivity(intent);
((Activity) context).overridePendingTransition(0, 0);
notifyDataSetChanged(); // Create this function in your adapter class
/* if(state != null) {
// lv.requestFocus();
mList.((Activity) context).onRestoreInstanceState(state);
}
*/
//Toast.makeText(context, "Already liked", Toast.LENGTH_LONG).show();
}
else if (success== 5){
// no products found
Toast.makeText(context, "Already liked", Toast.LENGTH_LONG).show();
}
} else {
removeItemFromList1();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
//pDialog.dismiss();
// updating UI from Background Thread
//pDialog.dismiss();
}
}
但这正在重新加载整个活动。我只是想刷新那一行。我知道有可能使用listview.notifyDataSetChanged（）进行刷新;或者通过刷新处理程序但这只能从主类中工作，而不是通过扩展基类适配器的Customlist适配器类，并且如果可能的话，我想保留列表位置，就像我们在主活动中使用listview.onRestoreInstanceState（state）一样