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POCouldn't load string value in arraylist
 

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    <p>I want to get the phone contacts and show in the listView. But i couldn't load the string values in array list. i do not know how to solve this.</p> <p>Log cat error:</p> <pre><code>01-07 12:43:49.381: E/AndroidRuntime(863): FATAL EXCEPTION: main 01-07 12:43:49.381: E/AndroidRuntime(863): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rathnasoft.sample/com.rathnasoft.sample.ContactsPhone}: java.lang.NullPointerException 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.os.Handler.dispatchMessage(Handler.java:99) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.os.Looper.loop(Looper.java:123) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-07 12:43:49.381: E/AndroidRuntime(863): at java.lang.reflect.Method.invokeNative(Native Method) 01-07 12:43:49.381: E/AndroidRuntime(863): at java.lang.reflect.Method.invoke(Method.java:521) 01-07 12:43:49.381: E/AndroidRuntime(863): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-07 12:43:49.381: E/AndroidRuntime(863): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-07 12:43:49.381: E/AndroidRuntime(863): at dalvik.system.NativeStart.main(Native Method) 01-07 12:43:49.381: E/AndroidRuntime(863): Caused by: java.lang.NullPointerException 01-07 12:43:49.381: E/AndroidRuntime(863): at com.rathnasoft.sample.ContactsPhone.displayContacts(ContactsPhone.java:67) 01-07 12:43:49.381: E/AndroidRuntime(863): at com.rathnasoft.sample.ContactsPhone.onCreate(ContactsPhone.java:22) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 01-07 12:43:49.381: E/AndroidRuntime(863): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 01-07 12:43:49.381: E/AndroidRuntime(863): ... 11 more </code></pre> <p>Coding part:</p> <pre><code>public class ContactsPhone extends Activity { private ListView lvContact; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.contacts); lvContact = (ListView) findViewById(R.id.listView1); ArrayList&lt;String&gt; list = displayContacts(); ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;(getBaseContext(), android.R.layout.simple_list_item_1,list); lvContact.setAdapter(adapter); } private ArrayList&lt;String&gt; displayContacts() { ContentResolver cr = getContentResolver(); Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null); ArrayList&lt;String&gt; contact = null; String phoneNo = null; if (cur.getCount() &gt; 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))) &gt; 0) { Cursor pCur = cr.query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null); while (pCur.moveToNext()) { phoneNo = pCur .getString(pCur .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); System.out.println("name" + name + "ph no" + phoneNo); Toast.makeText(this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show(); } pCur.close(); } contact.add(name + "\n" + phoneNo); } } return contact; } } </code></pre>
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