I'm trying to get data from sqlite to listview so i followed the example in the answer in this url Make listview from SQLite database
the CustomCursorAdapter is going like that
public class CustomCursorAdapter extends SimpleCursorAdapter {
private int layout;
private LayoutInflater inflater;
private Context context;
public CustomCursorAdapter (Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
this.layout = layout;
this.context = context;
inflater = LayoutInflater.from(context);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v = inflater.inflate(R.layout.topics, parent, false);
return v;
}
@Override
public void bindView(View v, Context context, Cursor c) {
//1 is the column where you're getting your data from
String name = c.getString(1);
/**
* Next set the name of the entry.
*/
TextView name_text = (TextView) v.findViewById(R.id.listLabel);
if (name_text != null) {
name_text.setText(name);
}
}
}
but onCreate i have this code
ListView listView = (ListView)findViewById(R.layout.topics);
connectToDB();
from = new String[] { "topicTitle" };
to = new int[] { R.id.listLabel };
CustomCursorAdapter adapter = new CustomCursorAdapter(this,
R.layout.topics, cursor, from, to);
listView.setAdapter(adapter);
with xml as follows
<?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"
android:padding="5dp" >
<ImageView
android:id="@+id/listLogo"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="20dp"
android:layout_marginTop="5dp"
>
</ImageView>
<TextView
android:id="@+id/listLabel"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:text="@+id/label"
android:textSize="15sp" >
</TextView>
</LinearLayout>
the problem is .. listView is Null!! .. which i don't know why!!
You are refering to your layout topics. You should have a listview defined in xml with a id. In your activity onCreate() after setCOntentView(R.layout.topics), fins the id of listview and set adapter to your list.
In your xml say topics.xml
<?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"
android:orientation="vertical"
android:background="#0095FF">
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:id="@+id/lv">
</ListView>
// other ui elements
</LinearLayout>
Then in your activity onCreate()
setContentview(R.layout.topics);
ListView listView = (ListView)findViewById(R.id.lv);
connectToDB();
from = new String[] { "topicTitle" };
to = new int[] { R.id.listLabel };
CustomCursorAdapter adapter = new CustomCursorAdapter(this,
R.layout.topics, cursor, from, to);
listView.setAdapter(adapter);
From the discussion in chat
EDIT:
Define main.xml
<?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"
android:orientation="vertical"
android:background="#0095FF">
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:focusableInTouchMode="false"
android:listSelector="@android:color/transparent"
android:layout_weight="2"
android:headerDividersEnabled="false"
android:footerDividersEnabled="false"
android:dividerHeight="8dp"
android:divider="#000000"
android:cacheColorHint="#000000"
android:drawSelectorOnTop="false">
</ListView>
</LinearLayout>
In your activivity
public class MainActivity extends Activity {
ListView lv;
CustomCursorAdapter cus;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lv = (ListView) findViewById(R.id.list);
cus= new CustomCursorAdapter(parameters);
lv.setAdapter(cus);
}
}
Define customCursor adapter inflate a custom layout. Set image for image view and text for textview.
Try to edit your xml
<?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"
android:padding="5dp"
android:id="@+id/main"
>
<ImageView
android:id="@+id/listLogo"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="20dp"
android:layout_marginTop="5dp"
>
</ImageView>
<TextView
android:id="@+id/listLabel"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:text="@+id/label"
android:textSize="15sp" >
</TextView>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/topics"
></ListView>
</LinearLayout>
In Activity onCreate
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView listView = (ListView)findViewById(R.layout.topics);
connectToDB();
from = new String[] { "topicTitle" };
to = new int[] { R.id.listLabel };
CustomCursorAdapter adapter = new CustomCursorAdapter(this,
R.layout.topics, cursor, from, to);
listView.setAdapter(adapter);
}
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