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POCustomListView with Checkboxes
 

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    <p>I am a novice with at android programming so please bear with me. I have looked around a lot on StackOverFlow for solution for this but I couldn't understand how it works. So I tried to make one myself. All I want is to be able to view the contacts in a phone in a <em>listView</em> with <em>checkboxes</em>. This should only happen when a button is clicked. The code is pasted below</p> <pre><code>import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.ContactsContract; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleCursorAdapter; public class AddContacts extends Activity implements OnClickListener { static final String[] FROM = { ContactsContract.Contacts._ID, ContactsContract.Contacts.DISPLAY_NAME }; static final int[] TO = { R.id.contact_name, R.id.phone_number }; ListView list; Cursor cursor; SimpleCursorAdapter adapter; Button AddNumber; EditText number1; EditText number2; EditText number3; String contact1; String contact2; static final String TAG = "In AddContacts"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.secondscreen); AddNumber = (Button) findViewById(R.id.AddNumbers); number1 = (EditText) findViewById(R.id.NumberField1); number2 = (EditText) findViewById(R.id.NumberField2); number3 = (EditText) findViewById(R.id.NumberField3); AddNumber.setOnClickListener(this); list = (ListView)findViewById(R.id.list); Log.d(TAG, "onCreate"); } @Override public void onClick(View v) { Uri uri = ContactsContract.Contacts.CONTENT_URI; String[] projection = new String[] { ContactsContract.Contacts._ID, ContactsContract.Contacts.DISPLAY_NAME }; String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '1'"; String[] selectionArgs = null; String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC"; cursor = managedQuery(uri, projection, selection, selectionArgs, sortOrder); adapter = new SimpleCursorAdapter(this, R.layout.row, cursor, FROM, TO); list.setAdapter(adapter); // Intent intents = new Intent(Intent.ACTION_PICK, // ContactsContract.Contacts.CONTENT_URI); // startActivityForResult(intents, PICK_CONTACT); contact1 = number1.getText().toString(); if (!contact1.matches(regularExpression)) { AddNumber.setEnabled(false); } Log.d(TAG, "onClicked method"); Intent intent = new Intent(AddContacts.this, TrackLogic.class); intent.putExtra("contact1", contact1); Log.d(TAG, "contact values are: " + contact1); startActivity(intent); } } </code></pre> <p>This code is for the individual row in the ListView </p> <pre><code>&lt;TextView android:id="@+id/contact_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="John Doe" android:textAppearance="?android:attr/textAppearanceMedium" /&gt; &lt;TextView android:id="@+id/phone_number" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/contact_name" android:text="(999)999-9999" android:textAppearance="?android:attr/textAppearanceSmall" /&gt; &lt;CheckBox android:id="@+id/checkBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:text="CheckBox" /&gt; </code></pre> <p></p> <p>This code is for the ListView</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;TextView style="@style/AppTheme" /&gt; &lt;ListView android:id="@+id/list" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;/ListView&gt; &lt;/LinearLayout&gt; </code></pre> <p>This code run without an compilation error but crashes with a null pointer exception.</p> <blockquote> <p>06-22 10:57:48.177: E/AndroidRuntime(18986): FATAL EXCEPTION: main 06-22 10:57:48.177: E/AndroidRuntime(18986): java.lang.NullPointerException 06-22 10:57:48.177: E/AndroidRuntime(18986): at >com.example.s.AddContacts.onClick(AddContacts.java:68) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >android.view.View.performClick(View.java:4204) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >android.view.View$PerformClick.run(View.java:17355) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >android.os.Handler.handleCallback(Handler.java:725) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >android.os.Handler.dispatchMessage(Handler.java:92) 06-22 10:57:48.177: E/AndroidRuntime(18986): at android.os.Looper.loop(Looper.java:137) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >android.app.ActivityThread.main(ActivityThread.java:5041) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >java.lang.reflect.Method.invokeNative(Native Method) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >java.lang.reflect.Method.invoke(Method.java:511) 06-22 10:57:48.177: E/AndroidRuntime(18986): at >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)</p> </blockquote> <p>Can anyone tell me what am i doing wrong here? It would be great Thanks.</p>
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    1. USWayne Conrad
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    1. COPlease, write what string is it? AddContacts.java:68
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    2. CO@Dimmerg - It crashes at it list.setAdapter(adapter);
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    3. COthen either your list or adapter is null.. try checking in debug mode
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      1. USMichael Shrestha
 

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