specizripn
Lurker
Hello, I have been struggling with this for some time now. I am trying to populate a ListView from an arrayList, but my ListView isn't populating. I have gone through every relevant thread I have found on the internet and I still can't figure out why this isn't working. Also I checked to make sure the arrayList was populated and it is.
I have no errors, but the ListView just displays blank. If anyone can figure out why it isn't working I will mail you a cookie! Debugging this is just getting depressing. Thanks!!!
Adapter:
Main Activity for the function:
Here is my XML code.
menu_main.xml:
activity_usermatch.xml:
list_item.xml:
And here is the User class:
Any input would be highly appreciated! Like I said, I have been struggling with this for quite some time now and it is driving me crazy! Also, I am not trying to be a mooch. I will gladly help out other members on the forum once I get this figured out and get my sanity back, as this seems like a great place. Please and thanks!
I have no errors, but the ListView just displays blank. If anyone can figure out why it isn't working I will mail you a cookie! Debugging this is just getting depressing. Thanks!!!
Adapter:
Code:
public class ResultAdapter extends ArrayAdapter<User> implements View.OnClickListener { //implements View.OnClickListener
// private Activity activity;
Context mContext;
//private static LayoutInflater inflater = null;
private int layoutResourceId;
private static final String LOG_TAG = "ResultAdapter";
private ArrayList<User> users;
private class ViewHolder { //static
TextView usrName;
TextView usrSchool;
TextView usrEmail;
}
//public ResultAdapter(Context context, ArrayList<User> users)
public ResultAdapter(ArrayList<User> data, Context context) {
super(context, R.layout.list_item, data);
this.users = data;
this.mContext = context;
}
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
Object object = getItem(position);
User user=(User)object;
}
private int lastPosition = -1;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
User user = getItem(position);
ViewHolder viewHolder;
final View result;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.list_item, parent, false); //activity_usermatch
viewHolder.usrName = (TextView) convertView.findViewById(R.id.resultName);
viewHolder.usrEmail = (TextView) convertView.findViewById(R.id.resultEmail);
viewHolder.usrSchool = (TextView) convertView.findViewById(R.id.resultSchool);
result = convertView;
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
result = convertView;
}
Animation animation = AnimationUtils.loadAnimation(mContext, (position > lastPosition) ? R.anim.up_from_bottom : R.anim.down_from_top);
result.startAnimation(animation);
lastPosition = position;
viewHolder.usrName.setText(user.getName());
viewHolder.usrEmail.setText(user.getEmail());
viewHolder.usrSchool.setText(user.getSchool());
return result; //convertView
}
}
Code:
public class UserMatchActivity extends AppCompatActivity{
private static final String TAG = UserMatchActivity.class.getSimpleName();
private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;
public ArrayList<User> matchList;
ListView listView;
private static ResultAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
matchList = new ArrayList<>();
setContentView(R.layout.activity_match_main); //activity_match_main activity_usermatch
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// Progress dialog
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// Session manager
session = new SessionManager(getApplicationContext());
// SQLite database handler
db = new SQLiteHandler(getApplicationContext());
HashMap<String, String> user = db.getUserDetails();
String name = user.get("name");
String email = user.get("email");
final String school = user.get("school");
//get name,email,school of all matches who go to the same school
String tag_string_req = "get_matches";
StringRequest strReq = new StringRequest(Request.Method.POST,
AppConfig.URL_SEARCH, new Response.Listener<String>() { //{
@Override
public void onResponse(String response) { //JSONObject response
hideDialog();
try {
JSONArray jObj = new JSONArray(response);
boolean error = false;
String errortest = String.valueOf(error);
Log.d("error", errortest);
error = false;
if (!error) {
for (int i = 0; i < jObj.length(); i++) {
JSONObject childJSONObject = jObj.getJSONObject(i);
String name = childJSONObject.getString("name");
//Log.d("name", String.valueOf(name));
String email = childJSONObject.getString("email");
//Log.d("email", String.valueOf(email));
String sch = childJSONObject.getString("school");
//Log.d("school", String.valueOf(sch));
User usr = new User(name, email, sch);
matchList.add(usr);
}
//Testing to verify matchList my arrayList isn't empty, and it isn't
String koala = Integer.toString(matchList.size());
Log.d("testing123", koala);
} else {
String errorMsg = ("brokelol");
Toast.makeText(getApplicationContext(),
errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Match Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_LONG).show();
hideDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting parameters to search url
Map<String, String> params = new HashMap<>();
params.put("school", school);
return params;
}
};
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
adapter = new ResultAdapter(matchList, getApplicationContext());
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
User users = matchList.get(position);
Snackbar.make(view, "Name: "+users.getName()+"\n"+"School: "+users.getSchool()+"\n"+"Email: "+users.getEmail(), Snackbar.LENGTH_LONG)
.setAction("No action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void hideDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}Here is my XML code.
menu_main.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".UserMatchActivity">
<item android:id="@+id/action_settings"
android:title="action_settings"
android:orderInCategory="100" />
<ListView
android:id="@+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</menu>activity_usermatch.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/listMatches">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="vertical"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:id="@+id/MatchLayout">
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="@style/Widget.AppCompat.ProgressBar.Horizontal"/>
</LinearLayout>
</ListView>list_item.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/resultName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name"
/>
<TextView
android:id="@+id/resultEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Email"
/>
<TextView
android:id="@+id/resultSchool"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="School"
/>
</LinearLayout>And here is the User class:
Code:
public class User {
public String usrname;
public String usremail;
public String usrschool;
public User(JSONObject object) {
try {
this.usrname = object.getString("name");
this.usremail = object.getString("email");
this.usrschool = object.getString("school");
} catch (JSONException e) {
e.printStackTrace();
}
}
public User(String name, String email, final String school){
this.usrname = name;
this.usremail = email;
this.usrschool = school;
}
/*public User(String name, String email, String school) {
this.usrname = name;
this.usremail = email;
this.usrschool = school;}*/
public void setUsrname(final String name) {
usrname = name;
}
public void setUsremail(final String email) {
usremail = email;
}
public void setUsrschool(final String school) {
usrschool = school;
}
public String getName() {
return usrname;
}
public String getEmail() {
return usremail;
}
public String getSchool() {
return usrschool;
}
}Any input would be highly appreciated! Like I said, I have been struggling with this for quite some time now and it is driving me crazy! Also, I am not trying to be a mooch. I will gladly help out other members on the forum once I get this figured out and get my sanity back, as this seems like a great place. Please and thanks!
Last edited: