问题
I need help on how to change my code below to use my own XML list view. The items 'label', 'title', & 'discription' in my cursor needs to be inflated into itemLabel, itemTitle, & itemDiscription of the xml. Any help would be appreciated: I know how to do this from a simple array. The activity I created to get the data from a database works great - I just dont know how to use/display a custom lisView w/multilines. THNX!
REVISED: I managed to get the data to display from the database using my own custom XML file. The issue I have now is all three columns are returned in each TextView. ie: columns 'title', 'label', 'description' from the db all inflate into a single TextView as one continuous line. I cant figure out how to break it up into the correct TextViews; title = R.id.listTitle, label = R.id.label, and description should inflate into R.id.caption. Help!
The ListView Activity:(REVISED):
public class List_AC extends ListActivity {
private ArrayList<String> results = new ArrayList<String>();
File dbfile = new File("/mnt/sdcard/XXX/XXX/dB/XXX.db");
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
openAndQueryDatabase();
displayResultList();
}
private void displayResultList() {
AC_Adapter adapter = new AC_Adapter(getApplicationContext(),R.layout.list_item, results, results, results);
setListAdapter(adapter);
}
private void openAndQueryDatabase() {
try {
Cursor c = db.rawQuery("SELECT label, title, discription FROM AC_list", null);
if (c != null) {
if (c.moveToFirst()) {
do {
String i1 = c.getString(c.getColumnIndex("label"));
String i2 = c.getString(c.getColumnIndex("title"));
String i3 = c.getString(c.getColumnIndex("discription"));
results.add(i1 + i2 + i3);
} while (c.moveToNext());
}
}
} catch (SQLiteException se) {
Log.e(getClass().getSimpleName(),
"Could not create or Open the database");
} finally {
if (db != null)
db.close();
}
}
}
ADDED ADAPTER(AC_Adapter.java):
public class AC_Adapter extends ArrayAdapter<String> {
static List<String> Title = new ArrayList<String>();
static List<String> Label = new ArrayList<String>();
static List<String> Description = new ArrayList<String>();
Context myContext;
public AC_Adapter (Context context, int resource, List<String> aTitle, List<String> aLabel, List<String> aDescription){
super(context, resource, aTitle);
myContext = context;
Title= aTitle;
Label= aLabel;
Description = aDescription;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) myContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.list_item, null);
}
TextView tv_label = (TextView) v.findViewById(R.id.label);
TextView tv_title = (TextView) v.findViewById(R.id.listTitle);
TextView tv_decription = (TextView) v.findViewById(R.id.caption);
if (tv_label != null) {
tv_label.setText(Label.get(position));
}
if (tv_title != null) {
tv_title.setText(Title.get(position));
}
if (tv_decription != null) {
tv_decription.setText(Description.get(position));
}
return v;
}
}
This is the XML that needs to be created (list_view.xml) in the onCreate:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="30dip"
android:padding="4dip"
android:background="@drawable/gradient" >
<ImageButton
android:id="@+id/homeBtn"
android:src="@drawable/ic_menu_icon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:background="@null" />
<TextView
android:id="@+id/titleBarTitle"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textSize="18sp" />
<ImageButton
android:id="@+id/toolBtn"
android:src="@drawable/ic_menu_list"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:background="@null" />
</RelativeLayout>
<ListView
android:id="@+id/listItems"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />
</LinearLayout>
and the list item (list_item.xml):
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="@+id/itemLabel"
style="@style/listAcronym" />
<TextView
android:id="@+id/itemTitle"
style="@style/listTitle" />
<TextView
android:id="@+id/itemDiscription"
style="@style/listDiscription"/>
<ImageView
style="@style/listNextIcon" />
回答1:
The basic process is to create a Custom Adapter which will contain the layout R.layout.list_item
Thus, you replace this line setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, results));
in your code
by
setListAdapter(new CustomAdapter(this,R.layout.list_item, results));
Now you need to create a CustomAdapter which extends ArrayAdapter or BaseAdapter and override the getView method to inflate R.layout.list_item
Please refer to this excellent tutorial by Mark Murphy Custom ListView Adapter
If you do have any other doubts after trying this, please post it over here.
回答2:
Everything is fine, just add a class extends from ArrayAdapter and do something like this:
public class CustomAdapter extends ArrayAdapter<String>
{
List<String> Title= new ArrayList<String>();
List<String> Label= new ArrayList<String>();
Context myContext;
public CustomAdapter (Context context, int resource,
int textviewresourceid,
List<String> aTitle,
List<String> aLabel)
{
super(context, resource,textviewresourceid,aType);
myContext = context;
Title= aTitle;
Label= aLabel;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View v = convertView;
if (v == null)
{
LayoutInflater vi = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.list_view, null);
}
TextView tv_title = (TextView) v.findViewById(R.id.id_tv_Title);
TextView tv_Label= (TextView) v.findViewById(R.id.id_tv_Label);
if(tv_title != null)
{
tv_title.setText(Title.get(position));
}
if(tv_Label != null)
{
tv_Label.setText(Label.get(position));
}
return v;
}
And then use this adapter like:
CustomAdapter adapter = new CustomAdapter(getAppContext(),R.layout.list_view,Textview Title Id,your lists...);
setListAdapter(adapter);
Something like this.... Hope it helps...
回答3:
I have the correct anwser HERE along with the correct code.
来源：https://stackoverflow.com/questions/5781776/listview-custom-listview