I would like to populate my Listview using a loop, I have recently attempted to populate it in a very inefficient way by making multiple calls for the data from SQL. When I realized just how inefficient it was I began to pull the data from the server in one go by making use of arrays. I am having trouble changing my code for this to work.
What I need to do is find a way of looping through the below array of JSONArrays (Which is not the hard part for me), but to do so I need to have my GetSocietyDataASyncTask return the above array and find a way of passing it to the OnCreate/done method in SocietySearch.java (Alot of the Society objects in my code can be ignored and somehow replaced with List societies)
Now I believe that I have included all of the relevant code but if you need to see anything else please do not hesitate to ask me.
The data that is received by Java from my database looks like this:
[{"society_id":1,"name":"TestName1","email":"Test@email1","description":"TestDes1"},
{"society_id":2,"name":"TestName2","email":"Test@email2","description":"TestDes2"}]
SocietySearch Class:
public class SocietySearch extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_society_search);
Society society = new Society(-1, null, null, null);
ServerRequests serverRequest1 = new ServerRequests(SocietySearch.this);
serverRequest1.GetSocietyDataAsyncTask(society, new GetSocietyCallback() {
@Override
public void done(final Society returnedSociety) {
ListView lv = (ListView) findViewById(R.id.ListView);
List<ListViewItem> items = new ArrayList<>();
items.add(new ListViewItem() {{
ThumbnailResource = R.drawable.test;
Title = returnedSociety.socName;
Subtitle = returnedSociety.socDes;
}});
CustomListViewAdapter adapter = new CustomListViewAdapter(SocietySearch.this, items);
lv.setAdapter(adapter);
}
});
}
class ListViewItem {
public int ThumbnailResource;
public String Title;
public String Subtitle;
}
Relevant Part Of ServerRequests Class:
public class getSocietyDataAsyncTask extends AsyncTask<Void, Void, Society> {
Society society;
GetSocietyCallback societyCallback;
public getSocietyDataAsyncTask(Society society, GetSocietyCallback societyCallback) {
this.society = society;
this.societyCallback = societyCallback;
}
@Override
protected Society doInBackground(Void... params) {
BufferedReader reader = null;
Society returnedSociety = null;
List<Society> societies = new ArrayList<>();
try {
URL url = new URL(SERVER_ADDRESS + "/getsocietydata.php");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(CONNECTION_TIMEOUT);
con.setReadTimeout(CONNECTION_TIMEOUT);
con.setRequestMethod("POST");
con.setDoOutput(true);
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while ((line = reader.readLine()) != null) { //Read until there is something available
sb.append(line + "\n"); //Read and save line by line
}
line = sb.toString(); //Saving complete data received in string
//Check values received in Logcat
Log.i("custom_check", "The values received in the store part are as follows:");
Log.i("custom_check", line);
JSONArray ja = new JSONArray(line);
if (ja != null && ja.length() == 0) {
returnedSociety = null;
} else {
for (int i = 0; i <ja.length(); i++) {
JSONObject json = ja.optJSONObject(i);
//Storing each Json in a variable
int society_id = json.getInt("society_id");
String socName = json.getString("name");
String socEmail = json.getString("email");
String socDes = json.getString("description");
returnedSociety = new Society(society_id, socName, socEmail, socDes);
societies.add(returnedSociety);
}
return returnedSociety;
}
} catch (Exception e) {
e.printStackTrace();
Log.d("Sample", "Error has occurred!\n" + e.toString());
}
finally {
if (reader != null) {
try {
reader.close(); //Closing the
} catch (IOException e) {
e.printStackTrace();
}
}
}
return returnedSociety;
}
@Override
protected void onPostExecute(Society returnedSociety) {
super.onPostExecute(returnedSociety);
progressDialog.dismiss();
societyCallback.done(returnedSociety);
}
}
CustomListViewAdapter.java:
public class CustomListViewAdapter extends BaseAdapter {
LayoutInflater inflater;
List<SocietySearch.ListViewItem> items;
public CustomListViewAdapter(Activity context, List<SocietySearch.ListViewItem> items) {
super();
this.items = items;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
//Auto-generated method stub
return items.size(); // TODO Maybe this can be my sql count?
}
@Override
public Object getItem(int position) {
//Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
//Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
//Auto-generated method stub
ListViewItem item = items.get(position);
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.item_row, null);
ImageView test = (ImageView) vi.findViewById(R.id.imgThumbnail);
TextView txtTitle = (TextView) vi.findViewById(R.id.txtTitle);
TextView txtSubTitle = (TextView) vi.findViewById(R.id.txtSubTitle);
test.setImageResource(item.ThumbnailResource);
txtTitle.setText(item.Title);
txtSubTitle.setText(item.Subtitle);
return vi;
}
}
ListView Layour file (item_row.xml):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dip">
<ImageView
android:id="@+id/imgThumbnail"
android:layout_width="78dip"
android:layout_height="78dip"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:layout_marginLeft="-3dip"
android:scaleType="centerInside"></ImageView>
<TextView
android:id="@+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6dip"
android:layout_marginTop="6dip"
android:layout_toRightOf="@+id/imgThumbnail"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceLarge"></TextView>
<TextView
android:id="@+id/txtSubTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtTitle"
android:layout_marginLeft="6dip"
android:layout_marginTop="3dip"
android:layout_toRightOf="@+id/imgThumbnail"
android:text="TextView"></TextView>
</RelativeLayout>
