Parse XML and display it in an AlertDialog in Android
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27-09-2019 - |
Question
I have this .xml file with countries and their countrycodes in them. This is how it looks like:
<?xml version="1.0" encoding="UTF-8"?>
<landen>
<land>
<naam>Afghanistan</naam>
<code>AF</code>
</land>
<land>
<naam>Albani�</naam>
<code>AL</code>
</land>
<land>
<naam>Algerije</naam>
<code>DZ</code>
</land>
<land>
</landen>
Now I want people to choose one country out of an list. I though an AlertDialog would be nice to display everything.
The way i get the values out of my xml-file is like this:
protected ArrayList<Land> getLanden() {
ArrayList<Land> lijst = new ArrayList<Land>();
try {
DocumentBuilder builder =DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(getAssets().open("landenlijst.xml"));
NodeList nl = doc.getElementsByTagName("land");
for (int i=0;i<nl.getLength();i++) {
Node node = nl.item(i);
Land land = new Land();
land.land = Xml.innerHtml(Xml.getChildByTagName(node, "naam"));
land.landcode = Xml.innerHtml(Xml.getChildByTagName(node, "code"));
lijst.add(land);
}
Log.d("Gabug","Klaar met parsen");
Log.d("Gabug","Landen: " + lijst);
} catch (Exception e) {
e.printStackTrace();
}
return lijst;
}
And I use this to make my AlertDialog:
public void KiesLandMenu(){
ArrayList<Land> alleLanden = getLanden();
final CharSequence[] items = alleLanden.toArray(new CharSequence[alleLanden.size()]);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Kies land");
builder.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
switch (item){
case 0:
break;
case 1:
break;
case 2:
break;
}
}
});
AlertDialog alert = builder.create();
alert.show();
}
I don't know if this works as DDMS returns some bytecode or something when i Log it. And after that it Force Closes because of ArrayStoreException..
Now my question is; is this the best way to do this? if yes, how can I fix the ArrayStoreException? If no, what are better ways to let my user choose a country (a whole new view maybe)? Furthermore, how can I register what country someone tapped?
EDIT:
I slightly changed the sample code below and I get an NullPointerException now..
public void KiesLandMenu(){
ArrayAdapter<Land> arrAdapter;
ArrayList<Land> alleLanden = getLanden();
arrAdapter = new ArrayAdapter<Land>(this, android.R.layout.simple_list_item_single_choice, alleLanden);
ListView list = (ListView)findViewById(R.layout.lijstview);
list.setAdapter(arrAdapter);
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View view, int position,
long id) {
Log.e("item clicked", String.valueOf(position));
}
});
}
The NullPointerException is at list.setAdapter(arrAdapter);
Solution
Make a layout with a ListView, then set that layout in your onCreate. To make the list, you can do something like:
public class RunTestProject extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); //whatever you want your layout to be
}
// getLanden() implementation goes here
public void KiesLandMenu(){
ArrayList<Land> alleLanden = getLanden();
arrAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, alleLanden);
Dialog dialog = new Dialog(this);
dialog.setTitle("Kies land");
dialog.setContentView(R.layout.withList); // The dialog layout
ListView list = (ListView) dialog.findViewById(android.R.id.list); //note that it's not simply findViewById
list.setAdapter(arrAdapter);
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View view, int position,
long id) {
Log.e("item clicked", String.valueOf(position));
}
});
dialog.show();
}
}
When the user chooses on an item, you can see in the log that the item's position in the array is shown.
Your layout file can be something like:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
/>
</LinearLayout>
OTHER TIPS
You could probably extend AlertDialog
and give it a ListView
as a view. Then bind the ListView
to an ListAdapter
which uses your ArrayList
.
Edit:
ListView lv = new ListView(context);
ArrayAdapter aa = new ListAdapter(context, viewid, lijst);
lv.setAdapter(aa);
AlertDialog ad = new AlertDialog(context);
ad.setView(lv);
There is a bit more work than that though. You need to specify viewid
which is the View
representing each item in the ListView
.
The sdk reference is very good you know.
new AlertDialog.Builder(this)
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(R.string.alert_dialog_single_choice)
.setSingleChoiceItems(<ListAdapter> or CharaSequnce[] , 0, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked on a radio button do some stuff */
}
})
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
}
})
.create();
Note : Please see This link to Api for Bold text mentioned below
.setSingleChoiceItems(CharacterSequnce[] , 0, new DialogInterface.OnClickListener()....
Hope this helps . Thanks :)