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Refresh Grid View Dyanmically in Android

I have a problem that I display grid images that are parsed from Url, I developed a refinement search dialog to refine the grid search, but the problem is that the parsing works fine, but the Grid view does not update when I processed Refine Search. The Grid View Items tool is not updated, it shows the previous result. Please help me solve this problem.

the code:

package org.shopzilla.android.search; import java.net.URL; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.shopzilla.android.common.R; import org.shopzilla.android.parsing.SearchResult_Json; import org.shopzilla.android.parsing.Search_Refine_Json; import org.shopzilla.android.parsing.Search_refine_grid; import org.shopzilla.android.product.ProductComparisonActivity; import com.flurry.android.FlurryAgent; import android.app.Activity; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; public class SearchGridActivity extends Activity{ URL url1; public static Bitmap[] bmp; Bundle bundle; GridView grid; String prod_id; public static String str,str1; public static Boolean flag_grid=false; public static int count =0; ImageButton _gridImageButton, brand_options_btn,color_options_btn,mat_options_btn; Button categories_btn; public static String keyword; ArrayList<HashMap<String,Object>> list ; ListView listView,brandlist, colorlist; static final int DIALOG_PRODUCE_ID = 0,DIALOG_REFINE_ID=1; Dialog dialog_category,dialog_refine; public static ArrayList<String> brand_list_load = new ArrayList<String>(); public static ArrayList<String> store_list_load = new ArrayList<String>(); public static ArrayList<String> brand_count = new ArrayList<String>(); public static ArrayList<String> brand_id = new ArrayList<String>(); public static ArrayList<String> brand_array_list = new ArrayList<String>(); public static ArrayList<String> store_array_list = new ArrayList<String>(); public static ArrayList<String> store_count = new ArrayList<String>(); public static ArrayList<String> store_id = new ArrayList<String>(); public static ArrayList<String> brand_selected = new ArrayList<String>(); public static ArrayList<HashMap<String,Object>> arr_list = new ArrayList<HashMap<String,Object>>(); String final_keyword; public static Boolean falg=false; String store_name; String brand_name; public String temp; public static Boolean checkflag=true; EditText et_search; ArrayList<String> store_selected = new ArrayList<String>(); ArrayAdapter<String> slected_brand; ArrayAdapter<String> slected_store; ListView brand_list,store_list; ArrayAdapter<String> arrayAdapter,storeAdapter, store_new_adapter, brand_new_adapter; SimpleAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.searchgrid); bundle = getIntent().getExtras(); if(count==0) { keyword = bundle.getString("keyword"); final_keyword = keyword; } //str1 = bundle.getString("temp"); grid = (GridView)findViewById(R.id.Search_Result_Grid); grid.invalidateViews(); this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); final ProgressDialog dialog = ProgressDialog.show(this, "BIZRATE", "Loading.......", true); final Handler handler = new Handler() { public void handleMessage(Message msg) { callHereForEff(); dialog.dismiss(); } }; Thread checkUpdate = new Thread() { public void run() { if(count==1) { SearchResult_Json.json_parsing(final_keyword); } //SearchResultActivity.set_image(); Search_refine_grid.Json_parsing(); handler.sendEmptyMessage(0); } }; checkUpdate.start(); EditText et_search_grid = (EditText)findViewById(R.id.txt_search_grid); et_search_grid.setText(keyword); et_search_grid.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub Intent intent = new Intent(SearchGridActivity.this,SearchTabActivity.class); startActivity(intent); } }); Button btn_list = (Button)findViewById(R.id.btn_searchresult_list); Button btn_refine = (Button)findViewById(R.id.btn_RefineSearch); btn_refine.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub arrayAdapter = new ArrayAdapter<String>(SearchGridActivity.this,R.layout.ref_row, R.id.label, brand_list_load); storeAdapter = new ArrayAdapter<String>(SearchGridActivity.this,R.layout.ref_row, R.id.label, store_list_load); showDialog(0); } }); btn_list.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub Intent intent = new Intent(SearchGridActivity.this,SearchResultActivity.class); intent.putExtra("keyword", keyword); startActivity(intent); finish(); } }); /*for(int j=0;j<SearchResultActivity.image_me.size();j++) { ImageView iv = new ImageView(this); //iv.setImageBitmap(SearchResultActivity.me_bmp[j]); HashMap<String,Object> temp = new HashMap<String,Object>(); temp.put("image",iv.VISIBLE); temp.put("price", SearchResultActivity.min_price.get(j)); arr_list.add(temp); } adapter = new SimpleAdapter(SearchGridActivity.this,arr_list,R.layout.search_result_griditem,new String[] {"image","price"},new int[] {R.id.img_SearchResultGrid_Product,R.id.txt_SearchResultGrid_Price}); grid.setAdapter(adapter);*/ grid.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(SearchGridActivity.this, "" + position, Toast.LENGTH_SHORT).show(); if(SearchResultActivity.type.get(position).equals("OFFER")) { prod_id = SearchResultActivity.id.get(position); System.out.println("Offer Id==================="+prod_id); //type_po=true; Intent intent = new Intent(SearchGridActivity.this,ProductComparisonActivity.class); intent.putExtra("prod_type", "true"); intent.putExtra("prod_id", SearchResultActivity.id.get(position)); startActivity(intent); } else { prod_id = SearchResultActivity.id.get(position); System.out.println("Product Id==================="+prod_id); //type_po=false; Intent intent = new Intent(SearchGridActivity.this,ProductComparisonActivity.class); //intent.putExtra("productType", "SZPID"); intent.putExtra("prod_type", "false"); intent.putExtra("prod_id", SearchResultActivity.id.get(position)); startActivity(intent); } } }); } //Clear Arraylists public static void arralist_clear() { SearchResultActivity.min_price.clear(); SearchResultActivity.image_me.clear(); } protected void callHereForEff() { if(count==1) { //ImageAdapter obj1 = new ImageAdapter(this); //obj1.notifyDataSetChanged(); grid.setAdapter(new ImageAdapter(this)); final ImageAdapter im = new ImageAdapter(this); im.notifyDataSetChanged(); } else { //ImageAdapter obj = new ImageAdapter(this); //obj.notifyDataSetChanged(); grid.setAdapter(new ImageAdapter(this));//Load the GridView final ImageAdapter im = new ImageAdapter(this); im.notifyDataSetChanged(); } //grid.setAdapter(adapter); } //Showing Images with TextViews in Grid View public class ImageAdapter extends BaseAdapter{ Context mContext; public static final int ACTIVITY_CREATE = 10; public ImageAdapter(Context c){ mContext = c; } public int getCount() { // TODO Auto-generated method stub return SearchResultActivity.image_me.size(); } public View getView(int position, View convertView, ViewGroup parent) { View v; if(convertView==null){ LayoutInflater li = getLayoutInflater(); v = li.inflate(R.layout.search_result_griditem, null); TextView tv = (TextView)v.findViewById(R.id.txt_SearchResultGrid_Price); tv.setText(SearchResultActivity.min_price.get(position)); ImageView iv = (ImageView)v.findViewById(R.id.img_SearchResultGrid_Product); iv.setImageBitmap(SearchResultActivity.me_bmp[position]); } else { v = convertView; } return v; } public Object getItem(int arg0) { // TODO Auto-generated method stub return null; } public long getItemId(int arg0) { // TODO Auto-generated method stub return 0; } } //Dialog Creation for Refine Search. @Override protected Dialog onCreateDialog(int id) { brand_list_load.add(brand_array_list.get(0)); store_list_load.add(store_array_list.get(0)); store_new_adapter = new ArrayAdapter<String>(this,R.layout.ref_row, R.id.label, store_array_list); brand_new_adapter = new ArrayAdapter<String>(this,R.layout.ref_row, R.id.label, brand_array_list); switch(id) { case 0: dialog_refine = new Dialog(this); dialog_refine.setContentView(R.layout.refine_dialog); brand_list= (ListView)dialog_refine.findViewById(R.id.exp); store_list= (ListView)dialog_refine.findViewById(R.id.exp_mat); brand_list.invalidate(); store_list.invalidate(); brand_options_btn = (ImageButton)dialog_refine.findViewById(R.id.options_btn1); et_search = (EditText)dialog_refine.findViewById(R.id.txt_RefineSearch); et_search.setText(keyword); mat_options_btn = (ImageButton)dialog_refine.findViewById(R.id.options_btn3); //Loads Brands List brand_list.setAdapter(arrayAdapter); //Loads Color List //Loads Material List store_list.setAdapter(storeAdapter); //Reset Button //Click on any Brand brand_list.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) { String brand = (String) (brand_list.getAdapter()).getItem(arg2); brand_name = "+"+brand; temp = (String) (brand_list.getAdapter()).getItem(0); brand_selected.clear(); brand_selected.add(brand); //brand_list_load.clear(); arrayAdapter.clear(); brand_list.invalidate(); reload_list(); //arrayAdapter.add(brand); //slected_brand = new ArrayAdapter<String>(this,R.layout.ref_row, R.id.label, brand_selected); System.out.println("POSITION IS-->"+ brand); } }); //Click on any Store store_list.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) { String store = (String) (store_list.getAdapter()).getItem(arg2); store_name = "+"+store; store_selected.clear(); store_selected.add(store); //storeAdapter.add(store); storeAdapter.clear(); store_list.invalidate(); reload_storelist(); System.out.println("POSITION IS-->"+ store); } }); //Brand options brand_options_btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { arrayAdapter.clear(); brand_list.invalidate(); brand_list.setAdapter(brand_new_adapter); } }); // Material Options mat_options_btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub storeAdapter.clear(); store_list.invalidate(); store_list.setAdapter(store_new_adapter); } }); Button btn_reset = (Button)dialog_refine.findViewById(R.id.btn_Refine_reset); btn_reset.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub dialog_refine.dismiss(); } }); //Done Button Button done_btn=(Button)dialog_refine.findViewById(R.id.btn_Refine_Done); done_btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub //checkflag=false; count=1; SearchResultActivity.arraylists_clear(); final_keyword=et_search.getText().toString()+brand_name+store_name; Intent intent = new Intent(SearchGridActivity.this, SearchGridActivity.class); intent.putExtra("keyword", keyword); startActivity(intent); } }); break; default: dialog_refine = null; } return dialog_refine; } protected void reload_storelist() { // TODO Auto-generated method stub slected_store= new ArrayAdapter<String>(this,R.layout.ref_row, R.id.label, store_selected); store_list.setAdapter(slected_store); } protected void reload_list() { //brand_list.invalidate(); //arrayAdapter.clear(); slected_brand = new ArrayAdapter<String>(this,R.layout.ref_row, R.id.label, brand_selected); brand_list.setAdapter(slected_brand); //brand_selected.clear(); } //Flurry Implementation public void onStart() { super.onStart(); FlurryAgent.onStartSession(this, "AJT5DWUVF6IAE78NQV69"); // your code } public void onStop() { super.onStop(); FlurryAgent.onEndSession(this); // your code } }
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1 answer

I do not check all your code, but I see several problems:

1.

  grid.setAdapter(new ImageAdapter(this));//Load the GridView final ImageAdapter im = new ImageAdapter(this); im.notifyDataSetChanged();

Not sure what this should do, you create a new ImageAdapter, and then a second one and call notifyDataSetChanged on it, which seems pretty useless as it is not attached to any kind. 2. Your ImageAdapter class is broken, especially the getView method. The main idea of ​​getView is that you get a convertView transformation. If it is zero, create a view and set the information in it. If it is not null, reuse convertView and set the information in it. In your code, you only set information if the view is null, so as soon as you scroll or change the data, it will try to process the views and you will not change their contents.

The method should be something like

 public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null){ // No view passed, create one ! LayoutInflater li = getLayoutInflater(); v = li.inflate(R.layout.search_result_griditem, parent, false); } // Set the view content TextView tv = (TextView)v.findViewById(R.id.txt_SearchResultGrid_Price); tv.setText(SearchResultActivity.min_price.get(position)); ImageView iv = (ImageView)v.findViewById(R.id.img_SearchResultGrid_Product); iv.setImageBitmap(SearchResultActivity.me_bmp[position]); return v; }

You can also save the link to your adapter and call notifyDataSetChanged if you want the GridView to notifyDataSetChanged its contents.

Finally, you probably don't want the getItemId method in your ImageAdapter to return 0 all the time, since the GridView uses this identifier to manage the redesigned views and all. A simpler implementation would be

 public long getItemId(int position){ return position; }

It may also be useful to populate the getItem method.

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Source: https://habr.com/ru/post/891297/

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