Develop Reference

Passing data from one listview to another

I have been trying to pass the contact data from my second activity's list view to my main activity's list view, upon clicking the checkbox.But the data doesn't get transferred. How do I fix this?
MainActivity.java
package com.example.artist.sender;
import android.Manifest;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Parcelable;
import android.provider.ContactsContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.text.Editable;
import android.text.TextUtils;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;
import static android.R.id.input;
import static android.app.AlertDialog.*;
public class MainActivity extends AppCompatActivity {
EditText itemText;
Button addButton;
Button sendText;
TextView text;
Button contact;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
itemText = (EditText) findViewById(R.id.editText);
addButton = (Button) findViewById(R.id.button1);
text=(TextView) findViewById(R.id.textView);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (TextUtils.isEmpty(itemText.getText())||(itemText.getText().length()<10)||(itemText.getText().length()>10)) {
itemText.setError("The number is not valid.");
return;
} else {
text.setText(itemText.getText().toString());
itemText.setText("");
return;
}
}
});
Button delete;
delete = (Button) findViewById(R.id.btn2);
delete.setOnClickListener(new AdapterView.OnClickListener() {
#Override
public void onClick(View view) {
int con=text.getLineCount();
if(con==0)
Toast.makeText(MainActivity.this, "No number available to delete", Toast.LENGTH_SHORT).show();
else
text.setText("");
}
});
sendText=(Button) findViewById(R.id.btn3);
sendText.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String phoneno = text.getText().toString();
int count = text.getLineCount();
SmsManager smsMgrVar = SmsManager.getDefault();
if (count == 0) {
Toast.makeText(MainActivity.this, "No number available", Toast.LENGTH_SHORT).show();
}
else
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.SEND_SMS) == PackageManager.PERMISSION_GRANTED)
{
try{
smsMgrVar.sendTextMessage(phoneno, null, "Hey There!", null, null);
Toast.makeText(MainActivity.this, "Message Sent",Toast.LENGTH_LONG).show();
}
catch (Exception ErrVar)
{
Toast.makeText(MainActivity.this, "Message Sending Failed", Toast.LENGTH_SHORT).show();
ErrVar.printStackTrace();
}
}
else
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
requestPermissions(new String[]{Manifest.permission.SEND_SMS}, 10);
}
}
}
});
contact =(Button) findViewById(R.id.btn4);
contact.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
{
startActivity(new Intent(MainActivity.this,contacts.class));
}
}
});
String tempholder=getIntent().getStringExtra("Listviewclickvalue");
text.setText(tempholder);
}
}
contacts.java
package com.example.artist.sender;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.util.ArrayList;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import static android.Manifest.permission.READ_CONTACTS;
public class contacts extends MainActivity {
private static final int REQUEST_READ_CONTACTS = 444;
private ListView mListView;
private ProgressDialog pDialog;
private Handler updateBarHandler;
ArrayList<String> contactList;
Cursor cursor;
int counter;
ListView list;
String temp;
TextView itemText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pDialog = new ProgressDialog(contacts.this);
pDialog.setMessage("Reading contacts...");
pDialog.setCancelable(false);
pDialog.show();
mListView = (ListView) findViewById(R.id.list);
updateBarHandler = new Handler();
// Since reading contacts takes more time, let's run it on a separate thread.
new Thread(new Runnable() {
#Override
public void run() {
getContacts();
}
}).start();
// Set onclicklistener to the list item.
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//TODO Do whatever you want with the list data
Toast.makeText(getApplicationContext(), "item clicked : \n" + contactList.get(position), Toast.LENGTH_SHORT).show();
}
});
}
private boolean mayRequestContacts() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}
if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
return true;
}
if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
} else {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
}
return false;
}
/**
* Callback received when a permissions request has been completed.
*/
#Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
if (requestCode == REQUEST_READ_CONTACTS) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getContacts();
}
}
}
public void getContacts() {
if (!mayRequestContacts()) {
return;
}
contactList = new ArrayList<String>();
String phoneNumber = null;
// String email = null;
Uri CONTENT_URI = ContactsContract.Contacts.CONTENT_URI;
String _ID = ContactsContract.Contacts._ID;
String DISPLAY_NAME = ContactsContract.Contacts.DISPLAY_NAME;
String HAS_PHONE_NUMBER = ContactsContract.Contacts.HAS_PHONE_NUMBER;
Uri PhoneCONTENT_URI = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String Phone_CONTACT_ID = ContactsContract.CommonDataKinds.Phone.CONTACT_ID;
String NUMBER = ContactsContract.CommonDataKinds.Phone.NUMBER;
/* Uri EmailCONTENT_URI = ContactsContract.CommonDataKinds.Email.CONTENT_URI;
String EmailCONTACT_ID = ContactsContract.CommonDataKinds.Email.CONTACT_ID;
String DATA = ContactsContract.CommonDataKinds.Email.DATA;*/
StringBuffer output;
ContentResolver contentResolver = getContentResolver();
cursor = contentResolver.query(CONTENT_URI, null, null, null, null);
// Iterate every contact in the phone
if (cursor.getCount() > 0) {
counter = 0;
while (cursor.moveToNext()) {
output = new StringBuffer();
// Update the progress message
updateBarHandler.post(new Runnable() {
public void run() {
pDialog.setMessage("Reading contacts : " + counter++ + "/" + cursor.getCount());
}
});
String contact_id = cursor.getString(cursor.getColumnIndex(_ID));
String name = cursor.getString(cursor.getColumnIndex(DISPLAY_NAME));
int hasPhoneNumber = Integer.parseInt(cursor.getString(cursor.getColumnIndex(HAS_PHONE_NUMBER)));
if (hasPhoneNumber > 0) {
output.append("\n First Name:" + name);
//This is to read multiple phone numbers associated with the same contact
Cursor phoneCursor = contentResolver.query(PhoneCONTENT_URI, null, Phone_CONTACT_ID + " = ?", new String[]{contact_id}, null);
while (phoneCursor.moveToNext()) {
phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(NUMBER));
output.append("\n Phone number:" + phoneNumber);
}
phoneCursor.close();
/* // Read every email id associated with the contact
Cursor emailCursor = contentResolver.query(EmailCONTENT_URI, null, EmailCONTACT_ID + " = ?", new String[]{contact_id}, null);
while (emailCursor.moveToNext()) {
email = emailCursor.getString(emailCursor.getColumnIndex(DATA));
output.append("\n Email:" + email);
}
emailCursor.close();
String columns[] = {
ContactsContract.CommonDataKinds.Event.START_DATE,
ContactsContract.CommonDataKinds.Event.TYPE,
ContactsContract.CommonDataKinds.Event.MIMETYPE,
};*/
String where = ContactsContract.CommonDataKinds.Event.TYPE + "=" + ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY +
" and " + ContactsContract.CommonDataKinds.Event.MIMETYPE + " = '" + ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE + "' and " + ContactsContract.Data.CONTACT_ID + " = " + contact_id;
String[] selectionArgs = null;
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME;
/*Cursor birthdayCur = contentResolver.query(ContactsContract.Data.CONTENT_URI, columns, where, selectionArgs, sortOrder);
Log.d("BDAY", birthdayCur.getCount()+"");
if (birthdayCur.getCount() > 0) {
while (birthdayCur.moveToNext()) {
String birthday = birthdayCur.getString(birthdayCur.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE));
output.append("Birthday :" + birthday);
Log.d("BDAY", birthday);
}
}
birthdayCur.close();
}*/
// Add the contact to the ArrayList
contactList.add(output.toString());
}
// ListView has to be updated using a ui thread
runOnUiThread(new Runnable() {
#Override
public void run() {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.contact_text, R.id.text1, contactList);
mListView.setAdapter(adapter);
}
});
// Dismiss the progressbar after 500 millisecondds
updateBarHandler.postDelayed(new Runnable() {
#Override
public void run() {
pDialog.cancel();
}
}, 500);
}
}
//passing the number to the mainactivity's textview through intent
list=(ListView) findViewById(R.id.list);
final String listview[] = new String[list.getCount()];
for (int j = 0; j < list.getCount(); j++) {
View v = list.getChildAt(j);
TextView tv = (TextView) v.findViewById(R.id.text1);
listview[j] = (String) tv.getText();
}
itemText = (TextView) findViewById(R.id.text1);
final String number = itemText.getText().toString();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, listview);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if ((number.matches("[0-9]+"))&&(number.length()==10))
temp = listview[position].toString();
Intent intent = new Intent(contacts.this, MainActivity.class);
intent.putExtra("Listviewclickvalue", temp);
startActivity(intent);
}
}
);
}
}
logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.artist.sender/com.example.artist.sender.contacts}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setOnItemClickListener(android.widget.AdapterView$OnItemClickListener)' on a null object reference
This is the logcat for the error. It keeps showing that the setitemOnClickListener keeps referring to a null object whereas, I've already assigned the listview to its respective id.
EDIT:**I've fixed part of the error, by renaming the setContentView(R.layout.activity_main); in the contacts class to setContentView(R.layout.contacts); But now after that, it shows this error, **java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference

If the data in the database, or some other storage, only pass the _id or the location, respectively.
Instead of passing many extras, Android way is, actually, Parcable. Here a nice tutorial from Vogella
public class TestModel implements Parcelable {
String name;
String phoneNumber;
//.....
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(this.name);
dest.writeString(this.phoneNumber);
}
public static final Parcelable.Creator<TestModel> CREATOR = new Parcelable.Creator<TestModel>() {
#Override
public TestModel createFromParcel(Parcel source) {
return new TestModel(source);
}
#Override
public TestModel[] newArray(int size) {
return new TestModel[size];
}
};
}

Passing data from one listview to another textview

I have been trying to pass the contact data from my second activity's list view to my main activity's list view, upon clicking the data.But the app crashes just on clicking the contacts button. How do I fix this?
MainActivity.java
package com.example.artist.sender;
import android.Manifest;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Parcelable;
import android.provider.ContactsContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.text.Editable;
import android.text.TextUtils;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;
import static android.R.id.input;
import static android.app.AlertDialog.*;
public class MainActivity extends AppCompatActivity {
EditText itemText;
Button addButton;
Button sendText;
TextView text;
Button contact;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
itemText = (EditText) findViewById(R.id.editText);
addButton = (Button) findViewById(R.id.button1);
text=(TextView) findViewById(R.id.textView);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (TextUtils.isEmpty(itemText.getText())||(itemText.getText().length()<10)||(itemText.getText().length()>10)) {
itemText.setError("The number is not valid.");
return;
} else {
text.setText(itemText.getText().toString());
itemText.setText("");
return;
}
}
});
Button delete;
delete = (Button) findViewById(R.id.btn2);
delete.setOnClickListener(new AdapterView.OnClickListener() {
#Override
public void onClick(View view) {
int con=text.getLineCount();
if(con==0)
Toast.makeText(MainActivity.this, "No number available to delete", Toast.LENGTH_SHORT).show();
else
text.setText("");
}
});
sendText=(Button) findViewById(R.id.btn3);
sendText.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String phoneno = text.getText().toString();
int count = text.getLineCount();
SmsManager smsMgrVar = SmsManager.getDefault();
if (count == 0) {
Toast.makeText(MainActivity.this, "No number available", Toast.LENGTH_SHORT).show();
}
else
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.SEND_SMS) == PackageManager.PERMISSION_GRANTED)
{
try{
smsMgrVar.sendTextMessage(phoneno, null, "Hey There!", null, null);
Toast.makeText(MainActivity.this, "Message Sent",Toast.LENGTH_LONG).show();
}
catch (Exception ErrVar)
{
Toast.makeText(MainActivity.this, "Message Sending Failed", Toast.LENGTH_SHORT).show();
ErrVar.printStackTrace();
}
}
else
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
requestPermissions(new String[]{Manifest.permission.SEND_SMS}, 10);
}
}
}
});
contact =(Button) findViewById(R.id.btn4);
contact.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
{
startActivity(new Intent(MainActivity.this,contacts.class));
}
}
});
String tempholder=getIntent().getStringExtra("Listviewclickvalue");
text.setText(tempholder);
}
contacts.java
package com.example.artist.sender;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.util.ArrayList;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import static android.Manifest.permission.READ_CONTACTS;
public class contacts extends MainActivity {
private static final int REQUEST_READ_CONTACTS = 444;
private ListView mListView;
private ProgressDialog pDialog;
private Handler updateBarHandler;
ArrayList<String> contactList;
Cursor cursor;
int counter;
ListView list;
String temp;
TextView itemText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contacts);
pDialog = new ProgressDialog(contacts.this);
pDialog.setMessage("Reading contacts...");
pDialog.setCancelable(false);
pDialog.show();
mListView = (ListView) findViewById(R.id.list);
updateBarHandler = new Handler();
// Since reading contacts takes more time, let's run it on a separate thread.
new Thread(new Runnable() {
#Override
public void run() {
getContacts();
}
}).start();
// Set onclicklistener to the list item.
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//TODO Do whatever you want with the list data
Toast.makeText(getApplicationContext(), "item clicked : \n" + contactList.get(position), Toast.LENGTH_SHORT).show();
}
});
}
private boolean mayRequestContacts() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}
if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED)
{
return true;
}
if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
} else {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
}
return false;
}
/**
* Callback received when a permissions request has been completed.
*/
#Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
if (requestCode == REQUEST_READ_CONTACTS) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getContacts();
}
}
}
public void getContacts() {
if (!mayRequestContacts()) {
return;
}
contactList = new ArrayList<String>();
String phoneNumber = null;
// String email = null;
Uri CONTENT_URI = ContactsContract.Contacts.CONTENT_URI;
String _ID = ContactsContract.Contacts._ID;
String DISPLAY_NAME = ContactsContract.Contacts.DISPLAY_NAME;
String HAS_PHONE_NUMBER = ContactsContract.Contacts.HAS_PHONE_NUMBER;
Uri PhoneCONTENT_URI = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String Phone_CONTACT_ID = ContactsContract.CommonDataKinds.Phone.CONTACT_ID;
String NUMBER = ContactsContract.CommonDataKinds.Phone.NUMBER;
/* Uri EmailCONTENT_URI = ContactsContract.CommonDataKinds.Email.CONTENT_URI;
String EmailCONTACT_ID = ContactsContract.CommonDataKinds.Email.CONTACT_ID;
String DATA = ContactsContract.CommonDataKinds.Email.DATA;*/
StringBuffer output;
ContentResolver contentResolver = getContentResolver();
cursor = contentResolver.query(CONTENT_URI, null, null, null, null);
// Iterate every contact in the phone
if (cursor.getCount() > 0) {
counter = 0;
while (cursor.moveToNext()) {
output = new StringBuffer();
// Update the progress message
updateBarHandler.post(new Runnable() {
public void run() {
pDialog.setMessage("Reading contacts : " + counter++ + "/" + cursor.getCount());
}
});
String contact_id = cursor.getString(cursor.getColumnIndex(_ID));
String name = cursor.getString(cursor.getColumnIndex(DISPLAY_NAME));
int hasPhoneNumber = Integer.parseInt(cursor.getString(cursor.getColumnIndex(HAS_PHONE_NUMBER)));
if (hasPhoneNumber > 0) {
output.append("\n First Name:" + name);
//This is to read multiple phone numbers associated with the same contact
Cursor phoneCursor = contentResolver.query(PhoneCONTENT_URI, null, Phone_CONTACT_ID + " = ?", new String[]{contact_id}, null);
while (phoneCursor.moveToNext()) {
phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(NUMBER));
output.append("\n Phone number:" + phoneNumber);
}
phoneCursor.close();
/* // Read every email id associated with the contact
Cursor emailCursor = contentResolver.query(EmailCONTENT_URI, null, EmailCONTACT_ID + " = ?", new String[]{contact_id}, null);
while (emailCursor.moveToNext()) {
email = emailCursor.getString(emailCursor.getColumnIndex(DATA));
output.append("\n Email:" + email);
}
emailCursor.close();
String columns[] = {
ContactsContract.CommonDataKinds.Event.START_DATE,
ContactsContract.CommonDataKinds.Event.TYPE,
ContactsContract.CommonDataKinds.Event.MIMETYPE,
};*/
String where = ContactsContract.CommonDataKinds.Event.TYPE + "=" + ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY +
" and " + ContactsContract.CommonDataKinds.Event.MIMETYPE + " = '" + ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE + "' and " + ContactsContract.Data.CONTACT_ID + " = " + contact_id;
String[] selectionArgs = null;
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME;
/*Cursor birthdayCur = contentResolver.query(ContactsContract.Data.CONTENT_URI, columns, where, selectionArgs, sortOrder);
Log.d("BDAY", birthdayCur.getCount()+"");
if (birthdayCur.getCount() > 0) {
while (birthdayCur.moveToNext()) {
String birthday = birthdayCur.getString(birthdayCur.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE));
output.append("Birthday :" + birthday);
Log.d("BDAY", birthday);
}
}
birthdayCur.close();
}*/
// Add the contact to the ArrayList
contactList.add(output.toString());
}
// ListView has to be updated using a ui thread
runOnUiThread(new Runnable() {
#Override
public void run() {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.contact_text, R.id.text1, contactList);
mListView.setAdapter(adapter);
}
});
// Dismiss the progressbar after 500 millisecondds
updateBarHandler.postDelayed(new Runnable() {
#Override
public void run() {
pDialog.cancel();
}
}, 500);
}
}
//passing the number to the mainactivity's textview through intent
list=(ListView) findViewById(R.id.list);
final String listview[] = new String[list.getCount()];
for (int j = 0; j < list.getCount(); j++) {
View v = list.getChildAt(j);
TextView tv = (TextView) v.findViewById(R.id.text1);
listview[j] = (String) tv.getText();
}
itemText = (TextView) findViewById(R.id.text1);
final String number = itemText.getText().toString();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, listview);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if ((number.matches("[0-9]+"))&&(number.length()==10))
temp = listview[position].toString();
Intent intent = new Intent(contacts.this, MainActivity.class);
intent.putExtra("Listviewclickvalue", temp);
startActivity(intent);
}
}
);
}
logcat
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
at com.example.artist.sender.contacts.getContacts(contacts.java:236)
at com.example.artist.sender.contacts$1.run(contacts.java:57)
at java.lang.Thread.run(Thread.java:818)
This is the logcat for the error. It keeps showing that the findViewById keeps referring to a null object whereas, I've already assigned all the variables to their respective ids.

Use async task to modify element in a contact listview

i want to check if a phonenumber of my contacts is in a database.
So far i created a listview with a custom adapter and can display contact name, number and image. I added a fourth field that should display if the phonenumber is in the database.
i use asynctask to get a json like this {"android":{"error":"0"}} in case the number is in the database and to {"android":{"error":"1"}} if there is not.
my questions are how can i pass the phonenumber to the asynctask and what should the asynctask return so that the textview can be set to display "ok".
the code i use in all in one class.
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.PhoneLookup;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class contactos extends Activity {
ListView lv_addcontacts;
Cursor cur;
ContentResolver cr;
JSONArray android = null;
JSONParser jsonParser = new JSONParser();
private static String url = "my.php";
private static final String TAG_OS = "android";
private static final String TAG_ERROR = "error";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contactos);
readContacts();
if (!((cur.moveToFirst()) || cur.equals(null) || cur.getCount() == 0)) {
} else if (cur.getCount() > 0) {
cur.moveToFirst();
}
lv_addcontacts = (ListView) findViewById(R.id.lv_addcontact);
CustomAdapterAddContacts myad = new CustomAdapterAddContacts();
lv_addcontacts.setAdapter(myad);
}
class CustomAdapterAddContacts extends BaseAdapter {
#Override
public int getCount() {
System.out.println(cur.getCount());
return cur.getCount();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ContactViewHolder contactViewHolder;
if (convertView == null) {
// Inflate the layout
LayoutInflater li = getLayoutInflater();
convertView = li.inflate(
R.layout.contactos_detalle, null);
contactViewHolder = new ContactViewHolder();
contactViewHolder.imgContact = (ImageView) convertView
.findViewById(R.id.imgView_addcontact);
contactViewHolder.txtViewContactName = (TextView) convertView
.findViewById(R.id.txtView_addcontact_contactname);
contactViewHolder.txtViewPhoneNumber = (TextView) convertView
.findViewById(R.id.txtview_addcontact_phonenumber);
contactViewHolder.txtViewCheck = (TextView) convertView
.findViewById(R.id.txtview_addcontact_check);
convertView.setTag(contactViewHolder);
} else {
contactViewHolder = (ContactViewHolder) convertView.getTag();
}
cur.moveToPosition(position);
// Add Contact Name //
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
if (name != null)
contactViewHolder.txtViewContactName.setText(name);
else
contactViewHolder.txtViewContactName.setText("Unknown");
// Add Phone Number //
String phoneNumber = cur
.getString(cur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
if (phoneNumber != null)
contactViewHolder.txtViewPhoneNumber.setText(phoneNumber);
else
contactViewHolder.txtViewPhoneNumber.setText("Unknown");
// start async task to check if phone number is in a database
// if the async task returns true contactViewHolder.txtViewPhoneCheck.setText("OK");
// if the async task returns false contactViewHolder.txtViewPhoneCheck.setText("NOT OK");
new JSONParse().execute(phoneNumber);
Uri uri = getPhotoUri(Long.parseLong(fetchContactIdFromPhoneNumber(phoneNumber)));
if (uri != null) {
contactViewHolder.imgContact.setImageURI(uri);
} else {
contactViewHolder.imgContact
.setImageResource(R.drawable.ic_launcher);
}
return convertView;
}
private String fetchContactIdFromPhoneNumber(String phoneNumber) {
Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI,Uri.encode(phoneNumber));
Cursor cFetch = getContentResolver().query(uri,
new String[] { PhoneLookup.DISPLAY_NAME, PhoneLookup._ID },
null, null, null);
String contactId = "";
if (cFetch.moveToFirst()) {
cFetch.moveToFirst();
contactId = cFetch.getString(cFetch
.getColumnIndex(PhoneLookup._ID));
}
System.out.println(contactId);
return contactId;
}
public Uri getPhotoUri(long contactId) {
ContentResolver contentResolver = getContentResolver();
try {
Cursor cursor = contentResolver
.query(ContactsContract.Data.CONTENT_URI,
null,
ContactsContract.Data.CONTACT_ID
+ "="
+ contactId
+ " AND "
+ ContactsContract.Data.MIMETYPE
+ "='"
+ ContactsContract.CommonDataKinds.Photo.CONTENT_ITEM_TYPE
+ "'", null, null);
if (cursor != null) {
if (!cursor.moveToFirst()) {
return null; // no photo
}
} else {
return null; // error in cursor process
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
Uri person = ContentUris.withAppendedId(
ContactsContract.Contacts.CONTENT_URI, contactId);
return Uri.withAppendedPath(person,
ContactsContract.Contacts.Photo.CONTENT_DIRECTORY);
}
public class ContactViewHolder {
ImageView imgContact;
TextView txtViewContactName;
TextView txtViewPhoneNumber;
TextView txtViewCheck;
}
}
private void readContacts() {
cr = getContentResolver();
cur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");
}
// async check if gcm
private class JSONParse extends AsyncTask<String, String, JSONObject> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected JSONObject doInBackground(String... args) {
// is this the correct way to get the phoneNumber send in the execute
String phoneNumber = args[0];
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cel", phoneNumber));
JSONObject json = jsonParser.makeHttpRequest(url, "POST", params);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
try {
JSONObject android = json.getJSONObject(TAG_OS);
String error = android.optString(TAG_ERROR);
if(Integer.parseInt(error) == 0){
// if the async task returns true contactViewHolder.txtViewPhoneCheck.setText("OK");
// return true;
}
if(Integer.parseInt(error) == 1){
// if the async task returns false contactViewHolder.txtViewPhoneCheck.setText("NOT OK");
// return false;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
#Override
protected void onDestroy() {
super.onDestroy();
if (cur != null) {
cur.close();
}
}
}
thanks for helping.

You are on the right track with:
new JSONParse().execute(phoneNumber);
Just make sure phoneNumber is a String.
is this the correct way to get the phoneNumber send in the execute
String phoneNumber = args[0];
Yes, that is the correct way. The first and only argument your AsyncTask accepts is phoneNumber and the index of String..args starts at 0
Now, in your onPostExecutemethod, am not conversant with the JSONObject class, but I think if:
if(Integer.parseInt(error) == 0)
and
if(Integer.parseInt(error) == 1){
return true, then you could go ahead to set the edittext as desired?

how can i add only unique contact in my list in android

all..i have made a demo in android in that i have opened intent of addressbook and in my "onActivityResult" i am binding Contact name to List,All is going well but problem is i want ,if 1 contact name isalready added it shouldnt be added again ,my code is as below:
main.java
package com.example.mycontactpicker;
import java.util.zip.Inflater;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
public Button add;
public TextView contact;
public LinearLayout list;
private static final int CONTACT_PICKER_RESULT = 1200;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
add = (Button) findViewById(R.id.add);
list = (LinearLayout) findViewById(R.id.list);
add.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_PICK,
ContactsContract.Contacts.CONTENT_URI);
startActivityForResult(intent, CONTACT_PICKER_RESULT);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK && resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case CONTACT_PICKER_RESULT:
Uri contactData = data.getData();
Cursor c = managedQuery(contactData, null, null, null, null);
String orgName = "";
String title = "";
String emailId = "";
String cNumber = "";
String zipCode = "";
if (c.moveToFirst()) {
// Fetch Contact Name
String DisplayName = c
.getString(c
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
System.out.println("==============Display name:::::::::;; "
+ DisplayName);
View inflateView;
inflateView = LayoutInflater.from(MainActivity.this)
.inflate(R.layout.contact_row, null, true);
contact = (TextView) inflateView.findViewById(R.id.contact);
contact.setText(DisplayName);
list.addView(inflateView);
Toast.makeText(getApplicationContext(), DisplayName,
Toast.LENGTH_LONG).show();
String hasPhone = c
.getString(c
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
String contactId = c.getString(c
.getColumnIndex(ContactsContract.Contacts._ID));
// long id = c.getLong(Integer.parseInt(contactId));
if (DisplayName.equals("") || DisplayName.equals(" ")) {
DisplayName = c
.getString(c
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME_ALTERNATIVE));
System.out
.println("=============Display name:::::::::::outer side "
+ DisplayName);
}
}
}
}
}
}
pls help frends

To check if a contact name already exists in the address book you could add...
public boolean contactExists(String contact) {
if (contact != null) {
Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
while (cursor.moveToNext()) {
if (contact.equalsIgnoreCase(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)))) {
return true;
}
}
}
return false;
}

When I select contact name and address from contact list address data not retrieved

I need to get contact name and relevant address from contact list in android. I get the contact name and their phone number, but unfortunately unable to get the address details. When I select the contact address, it will return null every time.
I searched the google as well as stackoverflow. But unable to find a solution. When I searched I found that, address details are in another separate table, but I searched that table with id, but didn't return the data from the address table. So please help me to solve this problem. Thanks in advance,
Please find the code snippet which I used to get the contact details,
package com.contact.contacts;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.StructuredPostal;
import android.app.Activity;
import android.database.Cursor;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
public class MainActivity extends Activity implements OnItemClickListener{
private ListView listView;
private List<ContactBean> list = new ArrayList<ContactBean>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = (ListView) findViewById(R.id.list);
listView.setOnItemClickListener(this);
Cursor cur_phone = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null,
null, null);
while (cur_phone.moveToNext()) {
String name = cur_phone
.getString(cur_phone
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phoneNumber = cur_phone
.getString(cur_phone
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
String id = cur_phone.getString(cur_phone
.getColumnIndex(ContactsContract.Contacts._ID));
System.out.println("Cursor size : contact Name : "+name);
System.out.println("Cursor size : contact number : "+phoneNumber);
System.out.println("Cursor size : id : "+id);
Cursor cursor_address = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
cursor_address.close();
// get the data package containg the postal information for the contact
cursor_address = getContentResolver().query(ContactsContract.Data.CONTENT_URI,
new String[]{ StructuredPostal.STREET,
StructuredPostal.CITY,
StructuredPostal.POSTCODE},
ContactsContract.Data.CONTACT_ID + "=? AND " +
StructuredPostal.MIMETYPE + "=?",
new String[]{String.valueOf(id), StructuredPostal.CONTENT_ITEM_TYPE},
null);
cursor_address.moveToFirst();
System.out.println("Cursor size : Outside while");
while (cursor_address.moveToNext()) {
System.out.println("Cursor size : Inside while");
// This while statement is not running
if(cursor_address != null && cursor_address.moveToFirst())
{
if (cursor_address.getCount() > 0) {
String Street = cursor_address.getString(cursor_address.getColumnIndex(StructuredPostal.STREET));
System.out.println("Address : "+Street);
String Postcode = cursor_address.getString(cursor_address.getColumnIndex(StructuredPostal.POSTCODE));
String City = cursor_address.getString(cursor_address.getColumnIndex(StructuredPostal.CITY));
}
else
{
System.out.println("Cursor is : " + cursor_address);
Log.i("Contact : ", "Cursor :" + cursor_address);
}
}
else
{
System.out.println("Cursor Null : " + cursor_address);
Log.i("Contact App : ", "Cursor null" + cursor_address);
}
}
}
}
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
}
}

public ArrayList<String> getName(){
ArrayList<String> mdetail=new ArrayList<String>();
SQLiteDatabase db = this.getWritableDatabase();
String selectQuery = "SELECT "+COLUMN_PERSON_NAME+" from "+TABLE_DETAIL;
Cursor mCursor = db.rawQuery(selectQuery, null);
if(mCursor.moveToFirst()){
do {
mdetail.add(mCursor.getString(mCursor.getColumnIndex(COLUMN_PERSON_NAME)));
} while (mCursor.moveToNext());
}
mCursor.close();
db.close();
return mdetail;
}
if Your data is Sucessfully added in your database just use this code to retreive from database and show in list view like this....
if (!db.exists()) {
} else {
mListName=baseManager.getName();
listview.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,mListName));
}

Finally I solve the problem, Please find the below answer,
package com.contact.contacts;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.StructuredPostal;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnItemClickListener {
private ListView listView;
private List<ContactBean> list = new ArrayList<ContactBean>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = (ListView) findViewById(R.id.list);
listView.setOnItemClickListener(this);
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));
String phone = null;
String poBox = null;
String street = null;
String city = null;
String state = null;
String postalCode = null;
String country = null;
if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
//Query for phone
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
new String[]{id}, null);
while (pCur.moveToNext()) {
// Get the phone number
phone = pCur.getString(
pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
}
pCur.close();
}
String addrWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
String[] addrWhereParams = new String[]{id,
ContactsContract.CommonDataKinds.StructuredPostal.CONTENT_ITEM_TYPE};
Cursor addrCur = cr.query(ContactsContract.Data.CONTENT_URI,
null, addrWhere, addrWhereParams, null);
while(addrCur.moveToNext()) {
poBox = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POBOX));
street = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.STREET));
city = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.CITY));
state = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.REGION));
postalCode = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POSTCODE));
country = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.COUNTRY));
String type = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.TYPE));
}
addrCur.close();
ContactBean objContact = new ContactBean();
objContact.setName(name);
objContact.setPhoneNo(phone);
objContact.setAddressLine1(poBox);
objContact.setAddressLine2(street);
objContact.setCity(city);
objContact.setPostalCode(postalCode);
objContact.setCountry(country);
list.add(objContact);
ContactAdapter objAdapter = new ContactAdapter(ContactActivity.this,
R.layout.single_contact, list);
listView.setAdapter(objAdapter);
if (null != list && list.size() != 0) {
Collections.sort(list, new Comparator<ContactBean>() {
#Override
public int compare(ContactBean lhs, ContactBean rhs) {
return lhs.getName().compareTo(rhs.getName());
}
});
} else {
showToast("No Contact Found!!!");
}
}
}
}
private void showToast(String msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
#Override
public void onItemClick(AdapterView<?> listview, View v, int position,
long id) {
// Event for item click
}
}