Develop Reference

How to make Android ListView clickable using Hashmap?

First of all, i am sorry because there is similar question that already been asked before. I've tried but it does not worked in my program. Hence, I need some help from you to help me to finish my program. Thank you.
Problem : my list cannot be click to go to next activity.
ListPending.java
public void getTable(String r) {
final ListView lv;
lv = (ListView) findViewById(R.id.lsApproval);
ArrayList<HashMap<String, String>> feedList= new ArrayList<HashMap<String, String>>();
try {
JSONArray jArray = new JSONArray(r);
JSONObject jInit = jArray.getJSONObject(0);
String valid = jInit.getString("valid");
String none="NO";
String empty="EMPTY";
TextView tv;
tv = (TextView)findViewById(R.id.tvNone);
if (valid.equals(none))
{
TextView tv1,tv2,tv3;
tv1 = (TextView)findViewById(R.id.tvSname);
tv2 = (TextView)findViewById(R.id.tvDest);
tv3 = (TextView)findViewById(R.id.tvDate);
tv.setText("\n\n\n\n\n\n" + "You do not have applicant under your approval" + "\n\n\n\n" );
tv1.setText("");
tv2.setText("");
tv3.setText("");
}
else if (valid.equals(empty))
{
TextView tv1,tv2,tv3;
tv1 = (TextView)findViewById(R.id.tvSname);
tv2 = (TextView)findViewById(R.id.tvDest);
tv3 = (TextView)findViewById(R.id.tvDate);
tv.setText("\n\n\n\n\n\n" + "No Pending List" + "\n\n\n\n" );
tv1.setText("");
tv2.setText("");
tv3.setText("");
}
else
{
String j=String.valueOf(jArray.length());
tv.setText("Have " +j+" applications need your approval");
for(int i=0; i<jArray.length();i++){
JSONObject json = jArray.getJSONObject(i);
String date = json.getString("dtfrom");
StringTokenizer tk = new StringTokenizer(date);
String dat = tk.nextToken(); // <--- yyyy-mm-dd
String staff = json.getString("staffname");
String dest = json.getString("destination");
HashMap<String, String> map = new HashMap<String, String>();
map.put("image", String.valueOf(R.mipmap.view));
map.put("staff", staff);
map.put("dest", dest);
map.put("date", dat);
feedList.add(map);
SimpleAdapter simpleAdapter = new SimpleAdapter(this, feedList, R.layout.list_pending,
new String[]{"staff", "dest","date","image"},
new int[]{R.id.tvStaff, R.id.tvDest, R.id.tvDate, R.id.ibView});
lv.setAdapter(simpleAdapter);
// React to user clicks on item
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parentAdapter, View view, int position,
long id) {
Toast.makeText(ListPending.this, "try" , Toast.LENGTH_SHORT).show();
}
});
}
}
it successfully show the data from database but not clickable.

This kind of problem occur when another object on the list is either focusable or clickable. The solution is to:
Inspect your layout xml file and make sure that none of the views you are having on your list has its android:clickable set to true.
Avoid to use any clickable view like a button on your list, as this will make your list not clickable.

First of all find the views which are getting focus and not allow list to be focused and touch in all other views put
focusable=false and focusintouchMode=false in xml
and if it is still not allowing your listview to be clicked then can share your problem again.

Seem your view is not taking focus in listview.It's the issue of view when you click the list row, it is always the capture other view event. apply below property to your main layout in row file (list_pending.xml) and let me know whether its works or not?
android:descendantFocusability="blocksDescendants"
or programmatically
listView.setDescendantFocusability(ListView.FOCUS_BLOCK_DESCENDANTS);

ListView refresh items

I have a ListView with some items, but after I update a Database I'd like to "refresh" the ListView. Anyone can help me?
EDIT: populateListView add items to ListView
public void populateListView()
{
String URL = config.getUrl_For_Query() + ",&nameq=Select&tipo=select"; // my URL
String jsonString = reading.execute_query(URL); // jsonString is formatted well
try
{
JSONObject jsonResponse = new JSONObject(jsonString);
JSONArray array = jsonResponse.getJSONArray("elenco");
for (int i=0; i<array.length(); i++) // I scan all array
{
JSONObject nameObj = (JSONObject)array.get(i);
// I retrieve all information
allNames.add(nameObj.getString("name")); // Name
allLng.add(nameObj.getString("lng")); // Another information
}
}
catch (Exception e)
{ e.printStackTrace(); }
List<String> Array = new ArrayList<String>();
for(int i=0;i<allNames.size();i++) // I add all values
{
String value = allNames.get(i).toString() + ", \n\t" + allLng.get(i).toString();
Array.add(value); // here I populate my Array
}
final ListView listView = (ListView) getActivity().findViewById(R.id.List);
listView.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, Array));
//
// Click
//
}
saveChanges
public void saveChanges()
{
// I update a Database
// And then I'd like to refresh ListView's items
populateListView(); // Update ListView
}

Use a Comparator. There you define what to compare and how, in the compare() method you define what should be returned from two of your instances. Here's an example for a String Comparator.
Comparator myComparator = new Comparator<String>() {
public int compare(final String user1, final String user2) {
// This would return the ASCII representation of the first character of each string
return (int) user2.charAt(0) - (int) user1.charAt(0);
};
};
adapter.sort(myComparator);
This way, when you add an item, you don't have to recreate the whole Adapter but it will be sorted instead. But don't forget to call .notifyDataSetChanged() on your adapter, this will make (amongs other things) to refresh your layout.

Try using ArrayAdapter.insert method to insert objects in specific index.

At first take a look at this tutorial about SQlite database in Android.
So, your problem is that new items are added at the end of the list. Huh? This is because you have not notified Adapter from the changes of the Array.
ArrayAdapter<String> Adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, Array);
Your first solution is to clear Adapter before updating Database. Sth like:
Adapter.clear(); can do that. This way your Adapter is empty before updating database and new items are inserted. You can use Adapter.notifyDataSetChanched(); for awaring Adapter about the changes.
In above tutorial there is a custom Adapter. It uses this code:
List<String> Array = new ArrayList<String>();
Array = (ArrayList<String>) db.getAllContacts();
Adapter = new MyCustomAdapter(getActivity() [in fragment case or getApplicationContext() in Activity case], R.layout.simple_list_item_1, Array);
This way there is no need for clearing Adapter because it automatically does that. Wherever you use this method, updated adapter is used for showing the list.

I have all these items in a textview, how to put them in listview now

I am parsing JSON into a textview and i need some help trying to put that into a listview instead. I know this might be very easy for some, but my main focus of confusion is that in a textview, you are setting the text using the setText function. I am also new to android, so I don't have this basic down yet, but I appreciate any help in advance, thank you.
public void onClick(View arg0) {
TextView tv1 = (TextView) findViewById(R.id.textView1);
TextView tv2 = (TextView) findViewById(R.id.textView2);
try {
String buildings = getJSON("http://iam.colum.edu/portfolio/api/course?json=True");
//JSONObject jsonObject = new JSONObject(buildings);
JSONArray queryArray = new JSONArray(buildings);
//queryArray = queryArray.getJSONArray(0);
List<String> list = new ArrayList<String>();
for (int i=0; i<queryArray.length(); i++) {
list.add( queryArray.getString(i) );
}
String finaltext="";
StringBuilder sb = new StringBuilder();
for (int i=0; i<queryArray.length(); i++) {
// chain each string, separated with a new line
sb.append(queryArray.getString(i) + "\n");
}
// display the content on textview
tv1.setText(sb.toString());
//tv1.setText(arr[0]);
} catch (Exception e) {
e.printStackTrace();
Log.d("JSONError", e.toString());
}
}});

Basically you add your ListView in your layout file, and then in the code you set an Adapter on the ListView, which holds the data. And then all the magic is going to be done for you.
Please read
http://developer.android.com/guide/topics/ui/layout/listview.html
http://developer.android.com/guide/topics/ui/declaring-layout.html#AdapterViews
So in your case it would look something like this:
ListView listView = (ListView) findViewById(R.id.listview);
...
JSONArray queryArray = new JSONArray(buildings);
//queryArray = queryArray.getJSONArray(0);
ArrayList<String> list = new ArrayList<String>();
for (int i=0; i<queryArray.length(); i++) {
list.add( queryArray.getString(i) );
}
ArrayAdapter adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
This will take the content of your list and create one ListView item for each entry. The text is set to the layout file android.R.layout.simple_list_item_1 which is provided by android.
If you change the content of the ArrayAdapter (and thus the ListView) you have to call adapter.notifyDataSetChanged() to inform the system that the content has changed.
To change the layout, or add an Adapter for other data sources, please refer to the documentation.

TextView is ListView is not shown correctly

I have an app that take strings from database and put it in ListView.
this is the code for getting my String from database:
public void setLogView(String date){
ArrayAdapter<TextView> adapter = new ArrayAdapter<TextView>(this, android.R.layout.simple_list_item_1);
listView.setAdapter(adapter);
DataBaseMain dataBase = new DataBaseMain(this);
dataBase.open();
String[][] all = dataBase.dayLog(date);
dataBase.close();
if(all == null)
return;
String temporay = "";
for(int j = 0; j < all[0].length; j++){
temporay = "";
for (int i = 0; i < all.length; i++){
TextView text = new TextView(this);
temporay = temporay + " " + all[i][j];
text.setText(temporay);
adapter.add((TextView)text);
}
}
}
Its seems that i get new TextView in my ListView but the text is messed up.
I checked my temporay string and is fine.
Is somewhere in putting him in the ListView.
No error in logcat or exceptions.
here is what i got in my app ListView insted of my wanted text.(i wanted to put picutrue but i dont have enough repetion:

There, it becomes clear from the image you provided
Try, this..
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
listView.setAdapter(adapter);
Your adapter to appending textView object instead of String you are providing.
then add temporay instead of textView inside you loop..like
adapter.add(temporay);
This, will certainly solve your issue.

Change your adapter to ArrayAdapter<String>, and add temporay instead of the whole listview.
Or else, you can extend the ArrayAdapter in and override the getView()

Assuming that, you are trying to display the text in custom listview using separate layout.xml which contains only textview in it.
Check my example given below, this is how i did to achieve this:
First of all fetch the data you are want to display and store it in an ArrayList. Here, al_rec_id, al_rec_name are arraylists of the type Integer and String, respectively.
cursor = database.query("records_data", new String[]{"rec_id", "rec_name"}, "cat_id=?", new String[]{cat_id+""}, null, null, null);
if(cursor.getCount() == 0)
Toast.makeText(getBaseContext(), "No records found.", Toast.LENGTH_SHORT).show();
else
{
while(cursor.moveToNext())
{
al_rec_id.add(cursor.getInt(0));
al_rec_name.add(cursor.getString(1));
}
cursor.close();
}
After that, bind this arraylist with ArrayAdapter and then set this adapter to listview as below. Here, array_adapter_all_records is an ArrayAdapter of the type String
array_adapter_all_records = new ArrayAdapter<String>(this, R.layout.single_row_home, R.id.textViewSingleRowHome, al_rec_name);
listview_all_records.setAdapter(array_adapter_all_records);
This is my single_row_home.xml code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
android:background="#ffffff" >
<TextView
android:id="#+id/textViewSingleRowHome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
style="#style/listview_only_textview"
android:text="TextView" />
</RelativeLayout>
Thats it. And you're done...!!!

Create a class custom adapter which will extend your ArrayList Adapter in that You can either inflate a different xml which contains your textview or you can create a dynamic textview as you are doing it now in your getView method in custom Adapter. If You need an example let me know.

list results from mysql on a listview in android

I'm working on this tutorial, it's about querying the mysql database by using Json and a php script, and everything is just fine, but I'm working on listing these results you see here in a ListView and not as a TextView as you see below. Thats seems easy, but I can't make it work by replacing TextView with ListView.
image:
Here is the tutorial (code inside) :
http://blog.erlem.fr/fr/applications-mobiles/android/27-android-blog/applications-mobiles/android/59-android-connexion-a-mysql-a-laide-de-php.html

All of the below assumes you have already parsed the JSON out into an array. See this for parsing help.
ListViews use adapters to grab the elements to fill the list rows up with. You'll have to feed the JSON results into a SimpleListAdapter via a List or array (ArrayList, what have you.).
from this page about listviews:
SimpleAdapter nommes = new SimpleAdapter(
this,
list,
R.layout.main_item_two_line_row,
new String[] { "line1","line2" },
new int[] { R.id.text1, R.id.text2 } );
(in your case you could show/hide the id/name by using a one-line layout or a two-line layout like in this example)
Then apply the adapter
listView.setAdapter(nommes);
EDIT:
jObject = new JSONObject("<your JSON string from provider>");
// in my case:
res = jObject.getJSONObject("results");
**dataAdapter = new ArrayAdapter<String>(this, R.layout.item, R.id.itemName);**
try {
for (int r = 0; r < rslt.length(); r++){
JSONArray jA = rslt.getJSONArray(Integer.toString(r));
schoolLocString = jA.getString(0) +"|"+ jA.getString(1) +"[" + jA.optString(2);
**dataAdapter.add(schoolLocString);**
}
**myListView.setListAdapter(dataAdapter);**
} catch (JSONException e) {
Log.v(TAG, "Exception " + e);
} catch (NullPointerException e){
Log.v(TAG, "NPE, no rslt");
}
This is a really lazy way to do it and probably bad practice, but you can get the idea.