android preferencefragment listview arrayadapter getview not called - android-listview

After researching / reviewing code the past couple days, a solution eludes me. The ArrayAdapter.getView() function is not being called.
ArrayAdapter.getCount() is returning 3.
This listview is similar to the WiFi preference fragment ..
https://android.googlesource.com/platform/packages/apps/Settings.git/+/6829c48c36fceebb46989f8ee25c369fa5f7adeb/src/com/android/settings/wifi/WifiSettings.java
The code samples at GitHub (using title search terms) show that this should be working.
Queries through stackoverflow for "getView not called" have suggested that
the List was not being passed in,
the count was not being returned,
the ArrayAdapter was not attached to the ListView properly using setListAdapter vs setAdapter
the ArrayAdapter and ListView scope need to be class vs method level
the ListView may not be visible, thus android knows it would not be able to draw it on the screen so getView() method is never called to render the objects.
Provided below are the PreferenceFragment and ArrayAdapter Classes, and XML files.
Your Thoughts?
PreferenceFragment Class
public class Settings_WebServers extends PreferenceFragment
{
protected MyAdapter adapter = null;
protected ListView lv = null;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate (savedInstanceState);
addPreferencesFromResource(R.xml.settings_webservers);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
super.onCreateView (inflater, container, savedInstanceState);
View v = inflater.inflate (R.layout.webservers, container, false);
List<String> strings = new ArrayList<String> ();
strings.add ("WebServer 1");
strings.add ("WebServer 2");
strings.add ("WebServer 3");
adapter = new MyAdapter (container.getContext(), R.layout.webservers_list, strings);
lv = (ListView) v.findViewById (android.R.id.list);
lv.setAdapter (adapter);
return v;
}
#Override
public void onStart()
{
super.onStart();;
Log.d ("onStart ", "Entered Function" );
Log.d ("ListView ", String.valueOf(lv.isShown()?"shown":"hidden"));
}
// ArrayAdapter embedded class
ArrayAdapter Class
private class MyAdapter extends ArrayAdapter<String>
{
Context context;
List<String> strings = new ArrayList<String>();
int layoutResourceId;
public MyAdapter(Context context, int layoutResourceId, List<String> objects)
{
super(context, layoutResourceId, objects);
this.layoutResourceId = layoutResourceId;
this.strings = objects;
this.context = context;
}
#Override
public int getCount ()
{ return (strings.size()); }
#Override
public View getView (int position, View convertView, ViewGroup parent)
{
Log.d ("getView position", String.valueOf (position) );
TextView lblServerName = null;
String current = strings.get (position);
LayoutInflater inflater =
(LayoutInflater) context.getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate
(R.layout.webservers_list, parent, false);
lblServerName = (TextView) convertView.findViewById (R.id.txtServerName);
if (lblServerName != null)
lblServerName.setText (String.valueOf(current));
return convertView;
}
}
}
Preference Header Segment
<header
android:fragment="ENetArch.Todo.Settings_WebServers"
android:icon="#drawable/icon_server"
android:title="WebServers"
android:summary="A list of servers to synchronize with"/>
xml.settings.webservers.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
</PreferenceScreen>
layout.webservers.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
layout.webservers_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip">
<TextView
android:id="#+id/txtServerName"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_width="match_parent"
android:text="ENetArch"
/>
</LinearLayout>
Log Trace
04-25 15:33:02.840: D/onCreateView(2941): Entered Function
04-25 15:33:02.930: D/MyAdapter(2941): construct entered
04-25 15:33:02.930: D/MyAdapter(2941): construct exited
04-25 15:33:02.950: D/getCount(2941): 3
04-25 15:33:02.950: D/getCount(2941): 3
04-25 15:33:02.950: D/onCreateView(2941): Exiting Function
04-25 15:33:03.070: D/onStart(2941): Entered Function
04-25 15:33:03.070: D/ListView(2941): hidden

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public class BaseActivity extends AppCompatActivity {
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#Override
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super.onDrawerClosed(drawerView);
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#Override
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Objects.requireNonNull(getSupportActionBar()).setTitle(getString(R.string.app_name));
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super.onDrawerOpened(drawerView);
}
#Override
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super.onDrawerSlide(drawerView, slideOffset);
}
#Override
public void onDrawerStateChanged(int newState) {
super.onDrawerStateChanged(newState);
}
};
mDrawerLayout.setDrawerListener(actionBarDrawerToggle);
if (isLaunch) {
isLaunch = false;
openActivity(1);
}
}
private void prepareListItems() {
menuList = new ArrayList<>();
menuList.add(" Activity1 ");
menuList.add(" Activity2 ");
menuList.add(" Activity3 ");
menuList.add(" Activity4 ");
}
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* #param position Launching activity when any list item is clicked.
*/
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mDrawerLayout.closeDrawer(mDrawerList);
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break;
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break;
case 2:
startActivity(new Intent(this, Activity2.class));
break;
case 3:
startActivity(new Intent(this, Activity3.class));
break;
case 4:
startActivity(new Intent(this, Activity4.class));
break;
default:
break;
}
// Toast.makeText(this, "Selected Item Position::" + position, Toast.LENGTH_LONG).show();
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#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
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return true;
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return super.onOptionsItemSelected(item);
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public class Activity1 extends BaseActivity {
#Override
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super.onCreate(savedInstanceState);
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super.onDestroy();
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navigation_drawer_base_layout
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android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
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android:layout_width="match_parent"
android:layout_height="match_parent" />
<ListView
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#drawable/simple_brushed_metal"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp" />
</androidx.drawerlayout.widget.DrawerLayout>
header
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/shade">
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android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<TextView
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android:fontFamily="serif"
android:gravity="center"
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android:gravity="center"
android:text="#string/developed_by_nd_software_solution"
android:textColor="#color/textColorPrimary"
android:textSize="12sp" />
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android:layout_height="1dp"
android:layout_marginTop="8dp"
android:background="#color/textColorPrimary" />
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drawer_list_item
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
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android:fontFamily="serif"
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android:paddingRight="16dp"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:textColor="#color/textColorPrimary" />
activity_main
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
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android:layout_height="match_parent"
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android:fontFamily="serif"
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Here I have provided code for one activity (Activity1), write code for other activities like Activity2, Activity3 etc.

togglebutton state changes when listview is scrolled down in android?

i have placed a textview and a toggle button into a list view by using the following xml file and i have used an arrayadapter to set it on to my layout, my problem is when i scroll down in the list view by unchecking a few toggle buttons (which are all set to be checked by default), they go back to default state and few others change state. As i want to fetch the state of the toggle button in my later stages its very important to stick on to the state that ive assigned to the toggle button. Please help to resolve this problem. Here are my xml file and the java code i use to set it on to the adapter. thank you in prior...
xml file that is named listdecor is included here
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lvlistdecor"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="horizontal"
android:weightSum="2" >
<TextView
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android:layout_height="wrap_content"
android:layout_weight="1.5"
android:ellipsize="marquee"
android:singleLine="true"
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android:textColor="#FFFFFF"
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android:layout_height="wrap_content"
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Sir i made certain changes and also included the custom adapter to the listview and also changed to CheckBox instead of toggle buttons. but now the entire list view is not visible on my emulator. i've included my edited java class and xml file, please suggest me the changes, thank you...
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#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); // Setting the window to full screen Step 1
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN); // Setting the window to full screen Step 2
setContentView(R.layout.attendance5);
facid = (TextView) findViewById(R.id.tvfacid);
facname = (TextView) findViewById(R.id.tvfacname);
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// llattendlist = (LinearLayout)findViewById(R.id.llattendlist);
String Uid = getIntent().getStringExtra("Uid");
facid.setText(Uid);
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subjectchosen.setText(Sub);
Attendusn = getIntent().getExtras();
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// TODO Auto-generated method stub
return checked;
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// TODO Auto-generated method stub
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this.checkbox=checkbox;
this.textview=textview;
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// TODO Auto-generated method stub
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public TextView getTextView(){
return textview;
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super(context,R.layout.listdecoration,R.id.tvlistdecor);
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public View getView(int position, View convertView, ViewGroup parent){
Stud_usn usn = (Stud_usn) this.getItem(position);
CheckBox checkbox;
TextView textview;
if(convertView == null){
convertView = inflater.inflate(R.layout.listdecoration,null);
textview = (TextView) convertView.findViewById(R.id.tvlistdecor);
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The view objects are recycled. You have to store that info sepperately. Not in the view but in the with the data you use in the adapter. When generating the views use this info to set the button state again.
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Use two components from different layouts

I have 2 layouts,in first layout I have EditText,Button and in second layout I have TextView. What I want is when i write something in EditText to copy that in second layout when you press button,but i get crash every time. Is there any way to use components from two layouts or i am missing something. If this is imposible another way would be good. Thx
main activity
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setContentView(R.layout.activity_main);
Button Start = (Button) findViewById(R.id.bStart);
Start.setOnClickListener(new View.OnClickListener() {
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setContentView(R.layout.numbers);
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startActivity(Changeto2);
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second activity
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// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.numbers);
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Next.setOnClickListener(new View.OnClickListener() {
#Override
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// TODO Auto-generated method stub
edit.setText(text.getText());
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First layout
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="Deprecated"
android:background="#drawable/grey_bg" >
<Button
android:id="#+id/bNext"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:layout_x="-1dp"
android:layout_y="405dp"
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android:textColor="#ffffff"
tools:ignore="HardcodedText" />
<EditText
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android:id="#+id/broj1"
android:layout_width="154dp"
android:layout_height="50dp"
android:layout_x="164dp"
android:layout_y="6dp"
android:background="#drawable/text_bg"
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tools:ignore="HardcodedText" >
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<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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android:layout_height="match_parent"
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android:orientation="vertical">
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android:layout_width="50dp"
android:layout_height="50dp"
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What you want to do is have two separate activities, one to edit the text, and one to display it.
The first one you want to set the layout to layout_main, and set a callback for the button. Inside the callback you want:
final EditText text = (EditText)findViewById(R.id.broj1);
Intent intent = new Intent(MainAct.this, NumGen.class);
Bundle bundle = new Bundle();
bundle.putString("mString",text.getText().toString());
intent.putExtras(bundle);
startActivity(intent);
Then inside your second activity (NumGen?) you can get that string you saved by doing this:
Bundle data = getIntent().getExtras();
String mString="";
if(data.containsKey("mString")){ mString=data.getString("mString"); }
One of the main issues it looks like you might be having is the ids defined in your XML files aren't the same as the ids in your code. After that, read up on how Activities work and pass information.

Android Listview with Listview item

I am trying to create a ListView where each item contains a TextItem and a ListView (dynamic length) but for some reason only one item is shown in the inner ListView. Is this something that is not possible or am I doing something wrong?
Here is my layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/outerListId"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
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Inner list item:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
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android:layout_height="wrap_content"
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<ListView
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android:layout_height="wrap_content"
android:id="#+id/innerListId"/>
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Code:
public class ListAllActivity extends Activity {
protected class MyListItem {
public String name;
public List<String> items;
public MyListItem(String name) {
this.name = name;
this.items = items();
}
public List<String> items() {
ArrayList<String> strings = new ArrayList<String>();
strings.add("item1");
strings.add("item2");
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}
}
public class CustomListViewAdapter extends ArrayAdapter<MyListItem> {
Context context;
public CustomListViewAdapter(Context context, int resourceId, List<MyListItem> items) {
super(context, resourceId, items);
this.context = context;
}
private class ViewHolder {
TextView nameText;
ListView myList;
}
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ViewHolder holder = null;
MyListItem rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.profile_exercises_list_item, null);
holder = new ViewHolder();
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.nameText = (TextView) convertView.findViewById(R.id.profileNameListItemId);
holder.myList = (ListView) convertView.findViewById(R.id.innerListId);
List<String> items = rowItem.items();
holder.nameText.setText(rowItem.name);
ArrayAdapter<String> myarrayAdapter = new ArrayAdapter<String>(convertView.getContext(), android.R.layout.simple_list_item_1, items);
holder.myList.setAdapter(myarrayAdapter);
holder.myList.setTextFilterEnabled(true);
return convertView;
}
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylayout);
ListView listView = (ListView) findViewById(R.id.outerListId);
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allItems.add(new MyListItem("name1"));
allItems.add(new MyListItem("name2"));
CustomListViewAdapter all = new CustomListViewAdapter(this, android.R.layout.simple_list_item_1, allItems);
listView.setAdapter(all);
listView.setTextFilterEnabled(true);
}
}
Instead of using Nested ListViews, you can use Expandable ListView.
Here are some useful links for playing with expandable ListView.
http://www.dreamincode.net/forums/topic/270612-how-to-get-started-with-expandablelistview/
http://android-adda.blogspot.com/2011/06/custom-expandable-listview.html

DialogFragments and activities, passing info

I'm trying to show a DialogFragment asking the user his name, and I need to get back this string to my main activity.
I've created an custom dialog fragment following the android guide: http://developer.android.com/guide/topics/ui/dialogs.html#CustomLayout
In my code, in response to the user click on positive button, I am able to call a function in my main activity:
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
builder.setView(inflater.inflate(R.layout.textdialog, null)).setPositiveButton("OK", new DialogInterface.OnClickListener(){
#Override
public void onClick(DialogInterface dialog, int id) {
((mainActivity)getActivity()).doPositiveClick();
}
}).setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
((mainActivity)getActivity()).doNegativeClick();
}
});
return builder.create();
}
where R.layout.textdialog is:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/textdraw"
android:inputType="textEmailAddress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginBottom="4dp"
android:hint="introduce text" />
</LinearLayout>
My question is, how could I get the text written by the user in my dialog fragment and send it back to my main activity?
thanks!
Well, I solved myself (but not sure if it's the better way)
I've done some changes in my onCreateDialog.
Save the view in a variable:
View v= inflater.inflate(R.layout.textdialog, null);
Save the edittext in a variable:
final EditText ed=(EditText)v.findViewById(R.id.textdraw);
Send back the value in edittext variable when the user clicks the positive button:
getActivity()).doPositiveClick(ed.getText().toString());
Full code is here:
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
View v= inflater.inflate(R.layout.textdialog, null);
// reference to the edittext
final EditText ed= (EditText)v.findViewById(R.id.textdraw);
builder.setView(v).setPositiveButton("OK", new DialogInterface.OnClickListener(){
#Override
public void onClick(DialogInterface dialog, int id) {
((mainActivity)getActivity()).doPositiveClick(ed.getText().toString());
}
}).setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
((mainActivity)getActivity()).doNegativeClick();
}
});
return builder.create();
}
and the code in main activity:
public void doPositiveClick(String ed){
Toast.makeText(this, "Hi, "+ed, Toast.LENGTH_SHORT).show();
}