I am new to android. I searched the web and found how to do a simple array adapter that will show all the contacts saved on your device in a list view. The code was running well until I was asked to do it in background.
When I update the code to do it in AsyncTask the items of the list view are added with a defalut white color as the background color and you can see what is written in the row when you click on the item.
public class MainActivity extends Activity {
ListView lv;
ArrayAdapter<String> adapter;
public String num1;
ArrayList<String> arr = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView) findViewById(R.id.listView1);
progress=(ProgressBar) findViewById(R.id.progressBar1);
new background().execute();
public class background extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
displayContacts();
return "success";
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), "Connection successfull "+result, Toast.LENGTH_SHORT).show();
String [] values=arr.toArray(new String[arr.size()]);
adapter = new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_list_item_1, android.R.id.text1, values);
// Assign adapter to ListView
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// ListView Clicked item index
int itemPosition = position;
// ListView Clicked item value
String itemValue = (String) lv.getItemAtPosition(position);
// Show Alert
Toast.makeText(getApplicationContext(),
"Position :"+itemPosition+" ListItem : " +itemValue , Toast.LENGTH_LONG)
.show();
}
});
registerForContextMenu(lv);
progress.setVisibility(View.GONE);
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
AdapterContextMenuInfo aInfo = (AdapterContextMenuInfo) menuInfo;
// We know that each row in the adapter is a Map
String num= adapter.getItem(aInfo.position);
this.num1=num;
menu.setHeaderTitle("Options for " + num);
menu.add(1, 1, 1, "Send ");
menu.add(1, 2, 2, "Delete");
}
public boolean onContextItemSelected(MenuItem item) {
int itemId = item.getItemId();
// Implements our logic
// Toast.makeText(this, "Item id ["+itemId+"]",
// Toast.LENGTH_SHORT).show();
if (itemId == 1) {
Toast.makeText(this, "number is:"+this.num1, Toast.LENGTH_LONG).show();
}
return true;
}
private void displayContacts() {
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer.parseInt(cur.getString(
cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
new String[]{id}, null);
while (pCur.moveToNext()) {
String phoneNo = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
// Toast.makeText(this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_LONG).show();
arr.add(phoneNo);
}
pCur.close();
}
}
}
}
the displayContacts() will add all the contacts to the ArrayList arr that will be used to be displayed in the list view.
I searched for changing the list view items text color and did it but still no changes in the text color. I was able to change the background color of the list item row only.
Here is a picture showing how the 6 items are being created in the list view but with white color as the background and the item that is clicked show what is the text inside the item row.
Image showing 6 items of list view
the activity_main.xml code is:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" />
<ProgressBar
android:id="@+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
