I am trying to get contacts on a listview and get selected items on button click. I use custom adapter, but I don't know how to get the selected items.
I tries lots of different methods like setOnItemChangeListener to store change state items. But none working.
Here is the code,
package com.example.callblocker;
import java.util.ArrayList;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Checkable;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ListView;
import android.widget.Toast;
/**
* Developed by Azharahmed
*/
public class MainActivity extends ListActivity {
/** Called when the activity is first created. */
private ArrayList<Contact> contact_list = null;
private ProgressDialog mProgressDialog = null;
private contactAdapter mContactAdapter = null;
private Runnable mViewcontacts = null;
private ArrayList<Contact> items;
boolean[] isChecked;
Cursor mCursor;
ListView lv;
Button blockSelectedBtn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
contact_list = new ArrayList<Contact>();
lv = getListView();
blockSelectedBtn = (Button)findViewById(R.id.button1);
blockSelectedBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
for (int i = 0; i < mContactAdapter.getCount(); i++)
{
Contact contact = mContactAdapter.getItem(i);
if (((Checkable) contact).isChecked())
{
Toast.makeText(MainActivity.this,
contact.getContactName() + " is Checked!!",
Toast.LENGTH_SHORT).show();
}
}
}
});
mViewcontacts = new Runnable() {
@Override
public void run() {
getContacts();
}
};
Thread thread = new Thread(null, mViewcontacts, "ContactReadBackground");
thread.start();
mProgressDialog = ProgressDialog.show(MainActivity.this,
"Please Wait...", "Retriving Contacts...", true);
}
@SuppressWarnings("unused")
private void getContacts() {
try {
String[] projection = new String[] {
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.Contacts.HAS_PHONE_NUMBER,
ContactsContract.Contacts._ID };
mCursor = managedQuery(ContactsContract.Contacts.CONTENT_URI,
projection, ContactsContract.Contacts.HAS_PHONE_NUMBER
+ "=?", new String[] { "1" },
ContactsContract.Contacts.DISPLAY_NAME);
while (mCursor.moveToNext()) {
Contact contact = new Contact();
String contactId = mCursor.getString(mCursor
.getColumnIndex(ContactsContract.Contacts._ID));
contact.setContactName(mCursor.getString(mCursor
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
contact_list.add(contact);
}
isChecked = new boolean[mCursor.getCount()];
for (int i = 0; i < isChecked.length; i++) {
isChecked[i] = false;
}
this.mContactAdapter = new contactAdapter(this, R.layout.listview,
contact_list);
lv.setAdapter(this.mContactAdapter);
mCursor.close();
runOnUiThread(returnRes);
} catch (Exception e) {
Log.d("getContacts", e.getMessage());
}
}
public class contactAdapter extends ArrayAdapter<Contact> {
public contactAdapter(Context context, int textViewResourceId,
ArrayList<Contact> items1) {
super(context, textViewResourceId, items1);
items = items1;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
ViewHolder mViewHolder;
mViewHolder = new ViewHolder();
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.listview, parent, false);
mViewHolder.cb = (CheckBox) convertView.findViewById(R.id.checkBox);
mViewHolder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Toast.makeText(MainActivity.this, "item changed", Toast.LENGTH_LONG).show();
}
});
convertView.setTag(mViewHolder);
if (isChecked[position] == true)
mViewHolder.cb.setChecked(true);
else
mViewHolder.cb.setChecked(false);
mViewHolder.cb
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean ischecked) {
if (buttonView.isChecked()) {
isChecked[position] = true;
} else {
isChecked[position] = false;
}
}
});
Contact contacts = items.get(position);
if (contacts != null) {
if (mViewHolder.cb != null) {
mViewHolder.cb.setText(contacts.getContactName());
}
}
return convertView;
}
}
public class ViewHolder {
CheckBox cb;
}
private Runnable returnRes = new Runnable() {
@Override
public void run() {
if (mProgressDialog.isShowing())
mProgressDialog.dismiss();
mContactAdapter.notifyDataSetChanged();
}
};
}
Here is one of the error code.
12-13 16:36:02.407: E/AndroidRuntime(14885): FATAL EXCEPTION: main
12-13 16:36:02.407: E/AndroidRuntime(14885): java.lang.ClassCastException: com.example.callblocker.Contact
12-13 16:36:02.407: E/AndroidRuntime(14885): at com.example.callblocker.MainActivity$2.onClick(MainActivity.java:62)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.view.View.performClick(View.java:2552)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.view.View$PerformClick.run(View.java:9229)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.os.Handler.handleCallback(Handler.java:587)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.os.Handler.dispatchMessage(Handler.java:92)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.os.Looper.loop(Looper.java:130)
12-13 16:36:02.407: E/AndroidRuntime(14885): at android.app.ActivityThread.main(ActivityThread.java:3701)
12-13 16:36:02.407: E/AndroidRuntime(14885): at java.lang.reflect.Method.invokeNative(Native Method)
12-13 16:36:02.407: E/AndroidRuntime(14885): at java.lang.reflect.Method.invoke(Method.java:507)
12-13 16:36:02.407: E/AndroidRuntime(14885): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
12-13 16:36:02.407: E/AndroidRuntime(14885): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
12-13 16:36:02.407: E/AndroidRuntime(14885): at dalvik.system.NativeStart.main(Native Method)
Any hint or suggestion will be very helpful.
You could try using SparseBooleanArray to get the selected items (from positions). Similar stackoverflow questions with relevant answers: