what’s my problem?
I’m trying to create a custom adapter in the dialogue. I can not understand what is the cause of the error.
create dialog:
protected Dialog onCreateDialog(int id) {
AlertDialog.Builder adb = new AlertDialog.Builder(this);
adb.setTitle("Choose contact");
view = (LinearLayout) getLayoutInflater().inflate(R.layout.dialog, null);
adb.setView(view);
deditText = (EditText) view.findViewById(R.id.deditText);
deditText.addTextChangedListener(this);
dlvNames = (ListView) view.findViewById(R.id.dlvCheck);
Cursor cursor = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
new String[] { Phone._ID, Phone.DISPLAY_NAME, Phone.NUMBER },
null, null, null);
startManagingCursor(cursor);
while (cursor.moveToNext()) {
ID=i;
CID=Long.valueOf(cursor.getString(0));
NAME=cursor.getString(1);
PHONE=cursor.getString(2);
Contact_List.add(new Contact(ID,CID,NAME,PHONE));
i++;
}
contactAdapter = new ContactAdapter(this,Contact_List );
//crashes here
dlvNames.setAdapter(contactAdapter);
dialog = adb.create();
return dialog;
}
create custom adapter:
public class ContactAdapter extends ArrayAdapter<Contact> {
private final Activity context;
ArrayList<Contact> Contact_List;
LayoutInflater lInflater;
static class ViewHolder {
public TextView tvName;
public TextView tvPhone;
}
public ContactAdapter(Activity context, ArrayList<Contact> Contact_List) {
super(context, R.layout.item, Contact_List);
this.context = context;
this.Contact_List = Contact_List;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
View view = convertView;
if (view == null) {
LayoutInflater inflater = context.getLayoutInflater();
//view = lInflater.inflate(R.layout.item, parent, false);
view = inflater.inflate(R.layout.item, null, true);
holder = new ViewHolder();
holder.tvName = (TextView) view.findViewById(R.id.tvName);
holder.tvPhone = (TextView) view.findViewById(R.id.tvPhone);
convertView.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
Contact c = getContact(position);
holder.tvName.setText(c.name);
holder.tvPhone.setText(c.phone);
return view;
}
Contact getContact(int position) {
return ((Contact) getItem(position));
}
}
LogCat:
01-17 06:40:31.801: E/AndroidRuntime(1263): FATAL EXCEPTION: main
01-17 06:40:31.801: E/AndroidRuntime(1263): java.lang.NullPointerException
01-17 06:40:31.801: E/AndroidRuntime(1263): at com.example.testreadcontacts.ContactAdapter.getView(ContactAdapter.java:50)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.AbsListView.obtainView(AbsListView.java:2271)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.ListView.onMeasure(ListView.java:1156)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-17 06:40:31.801: E/AndroidRuntime(1263): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.View.measure(View.java:15172)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.Choreographer.doFrame(Choreographer.java:525)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.os.Handler.handleCallback(Handler.java:615)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.os.Handler.dispatchMessage(Handler.java:92)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.os.Looper.loop(Looper.java:137)
01-17 06:40:31.801: E/AndroidRuntime(1263): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-17 06:40:31.801: E/AndroidRuntime(1263): at java.lang.reflect.Method.invokeNative(Native Method)
01-17 06:40:31.801: E/AndroidRuntime(1263): at java.lang.reflect.Method.invoke(Method.java:511)
01-17 06:40:31.801: E/AndroidRuntime(1263): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-17 06:40:31.801: E/AndroidRuntime(1263): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-17 06:40:31.801: E/AndroidRuntime(1263): at dalvik.system.NativeStart.main(Native Method)
This is inside the block that checks for null. If you hit this line, that variable is garunteed to be null. You want it to be view.setTag instead.