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FindViewById giving Unreachable statement error in Fragment activity [duplicate]

This question already has answers here:
I get the error "Unreachable statement" return in android
(3 answers)
Closed 5 years ago.
I'm pretty new to Fragment based activities. I'm working on a collapsible listview inside the CollapsingToolbarLayout.
Here, I'm facing Unreachable statement error in java file. Not able to get rid of it.
My code -
public class MenuActivity extends android.support.v4.app.Fragment {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_booktable, container, false);
// get the listview
expListView = (ExpandableListView) container.findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// Listview Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
#Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "Group Clicked " + listDataHeader.get(groupPosition),
// Toast.LENGTH_SHORT).show();
return false;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
#Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getActivity().getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
#Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getActivity().getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
Toast.makeText(
getActivity().getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("South Indian");
listDataHeader.add("Quick Bites");
listDataHeader.add("Soups");
// Adding child data
List<String> SouthIndian = new ArrayList<String>();
SouthIndian.add("Kara Bath");
SouthIndian.add("Chow Chow Bath");
SouthIndian.add("2 Idli 1 Vada");
SouthIndian.add("Rava Idli");
SouthIndian.add("Curd Vada");
SouthIndian.add("Masala Dosa");
List<String> QuickBites = new ArrayList<String>();
QuickBites.add("Veg Sandwich");
QuickBites.add("Veg Toast Sandwich");
QuickBites.add("Bread Butter Jam");
QuickBites.add("Bread Jam");
QuickBites.add("Pakoda");
QuickBites.add("Masala Puri");
List<String> Soups = new ArrayList<String>();
Soups.add("Tomato Soup");
Soups.add("Sweet corn Soup");
Soups.add("Veg Soup");
Soups.add("Veg Schezwan Soup");
Soups.add("Veg Noodles Soup");
listDataChild.put(listDataHeader.get(0), SouthIndian); // Header, Child data
listDataChild.put(listDataHeader.get(1), QuickBites);
listDataChild.put(listDataHeader.get(2), Soups);
}
}
How do I fix the error for the line expListView = (ExpandableListView) container.findViewById(R.id.lvExp); and make this code run?

move return inflater.inflate(R.layout.activity_booktable, container, false) to the end of method onCreateView()

Your first line in onCreateView already returns the View so the rest of the code is not executed:
return inflater.inflate(R.layout.activity_booktable, container, false);
You have to replace it with
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View myView = inflater.inflate(R.layout.activity_booktable, container, false);
...
return myView;
}
and then better do the findViewById on this view, e.g.
expListView = (ExpandableListView) myView.findViewById(R.id.lvExp);

Expandable list style Change?

while i am searching for examples to make list of answers in expandable list i found code which use 4 java classes and one xml with expand list but not use xml for parent and child and i want to change text color and check box color
XML
<Spinner
android:id="#+id/coursescomplaint"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:layout_gravity="center"
android:spinnerMode="dialog"
style="#style/spinner_style"/>
<ExpandableListView
android:id="#+id/expandcomplaintcourse"
android:layout_height="wrap_content"
android:layout_width="match_parent"/>
<Button
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#color/Button"
android:text="Submit"
android:layout_gravity="center"/>
JAVA
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;
import android.widget.Spinner;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Complaint extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private static List<Answers> questions;
private ExpandableListView expandableListView;
private AnswersAdabter adapter;
private int lastExpandedPosition = -1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_complaint);
LoadQuestions();
expandableListView = (ExpandableListView)findViewById(R.id.expandcomplaintcourse);
adapter = new AnswersAdabter(this, questions);
expandableListView.setAdapter(adapter);
// The choice mode has been moved from list view to adapter in order
// to not extend the class ExpansibleListView
adapter.setChoiceMode(AnswersAdabter.CHOICE_MODE_SINGLE_PER_GROUP);
// Handle the click when the user clicks an any child
expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
adapter.setClicked(groupPosition, childPosition);
return false;
}
});
expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
#Override
public void onGroupExpand(int groupPosition) {
if (lastExpandedPosition != -1 && groupPosition != lastExpandedPosition) {
expandableListView.collapseGroup(lastExpandedPosition);
}
lastExpandedPosition = groupPosition;
}
});
// Spinner element
Spinner spinner = (Spinner) findViewById(R.id.coursescomplaint);
// Spinner click listener
spinner.setOnItemSelectedListener(this);
// Spinner Drop down elements
List<String> categories = new ArrayList<String>();
categories.add("Course1");
categories.add("Course2");
categories.add("Course3");
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, R.layout.spinner, categories);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
}
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// On selecting a spinner item
String item = parent.getItemAtPosition(position).toString();
// Showing selected spinner item
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
private void LoadQuestions() {
questions = new ArrayList<Answers>();
ArrayList<String> citiesAustralia = new ArrayList<String>(
Arrays.asList("Brisbane", "Hobart", "Melbourne", "Sydney"));
questions.add(new Answers("Australia", citiesAustralia));
ArrayList<String> citiesChina = new ArrayList<String>(
Arrays.asList("Beijing", "Chuzhou", "Dongguan", "Shangzhou"));
questions.add(new Answers("China", citiesChina));
ArrayList<String> citiesIndia = new ArrayList<String>(
Arrays.asList("Bombay", "Calcutta", "Delhi", "Madras"));
questions.add(new Answers("India", citiesIndia));
ArrayList<String> citiesNewZealand = new ArrayList<String>(
Arrays.asList("Auckland", "Christchurch", "Wellington"));
questions.add(new Answers("New Zealand", citiesNewZealand));
ArrayList<String> citiesRussia = new ArrayList<String>(
Arrays.asList("Moscow", "Kursk", "Novosibirsk", "Saint Petersburg"));
questions.add(new Answers("Russia", citiesRussia));
}
}

How to implement onchildclick listener?

So I am having an expandable listview. What I want is to make clickable each children. If I press the first one I want to open the class1, if I press the second one I want to open the class2, if I press the third one I want to open the class3 and so on... I am new in programming so please explain me like you would do it for a dummy.
I am getting this error message
The constructor Intent(new ExpandableListView.OnChildClickListener(){}, Class<Men>) is undefined
Source Code
package info.androidhive.expandablelistview;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
public class MainActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// Listview Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
#Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "Group Clicked " + listDataHeader.get(groupPosition),
// Toast.LENGTH_SHORT).show();
return false;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
#Override
public void onGroupExpand(int groupPosition) {
//Toast.makeText(getApplicationContext(),
//listDataHeader.get(groupPosition) + " Expanded",
//Toast.LENGTH_SHORT).show();
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
#Override
public void onGroupCollapse(int groupPosition) {
//Toast.makeText(getApplicationContext(),
//listDataHeader.get(groupPosition) + " Collapsed",
//Toast.LENGTH_SHORT).show();
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
//Toast.makeText(
//getApplicationContext(),
// listDataHeader.get(groupPosition)
// + " : "
// + listDataChild.get(
// listDataHeader.get(groupPosition)).get(
// childPosition), Toast.LENGTH_SHORT)
//.show();
switch( childPosition )
{
case 0: Intent Men = new Intent(this, Men.class);
startActivity(Men);
break;
case 1: Intent newActivity2 = new Intent(this, youtube.class);
startActivity(newActivity2);
break;
case 2: Intent newActivity1 = new Intent(this, olympiakos.class);
startActivity(newActivity1);
break;
case 3: Intent newActivity3 = new Intent(this, karaiskaki.class);
startActivity(newActivity3);
break;
case 4: Intent newActivity4= new Intent(this, reservetickets.class);
startActivity(newActivity4);
break;
}
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Top 250");
listDataHeader.add("Now Showing");
listDataHeader.add("Coming Soon..");
// Adding child data
List<String> top250 = new ArrayList<String>();
top250.add("The Shawshank Redemption");
top250.add("The Godfather");
top250.add("The Godfather: Part II");
top250.add("Pulp Fiction");
top250.add("The Good, the Bad and the Ugly");
top250.add("The Dark Knight");
top250.add("12 Angry Men");
List<String> nowShowing = new ArrayList<String>();
nowShowing.add("The Conjuring");
nowShowing.add("Despicable Me 2");
nowShowing.add("Turbo");
nowShowing.add("Grown Ups 2");
nowShowing.add("Red 2");
nowShowing.add("The Wolverine");
List<String> comingSoon = new ArrayList<String>();
comingSoon.add("2 Guns");
comingSoon.add("The Smurfs 2");
comingSoon.add("The Spectacular Now");
comingSoon.add("The Canyons");
comingSoon.add("Europa Report");
listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
listDataChild.put(listDataHeader.get(1), nowShowing);
listDataChild.put(listDataHeader.get(2), comingSoon);
}

You dont have any Men class in your application. Thats why its showing error. See for the correct class name. Again for your convenience use a different intent name
case 0: Intent goactivity = new Intent(youractivity.this, men.class);
startActivity(goactivity);
//as your coding looks looks like may be your class is **men** not **Men**
Again if it is Men check if that extends Activity or not

It is basically because when you refer to this within a OnChildClickListener, it refers to the OnChildClickListener, not the Activity. Try using MainActivity.this instead. Or you can use view.getContext(). Both will give you the proper context.

In android using OnClickListner for expandable listview

I am new to android please help me out for this problem.
In expandable list view clicking on each child list new activity should open.
here is my code
package com.example.index;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;
public class IndexMainActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_index_main);
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
}
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Part 1");
listDataHeader.add("Part 2");
listDataHeader.add("Part 3");
// Adding child data
List<String> parta = new ArrayList<String>();
parta.add("Sweet Hour Of Prayer");
parta.add("Prayer and Royal Family");
parta.add("The Holy Bible-King James Version");
parta.add("William shakespeare - Scriptres about prayer");
List<String> partb = new ArrayList<String>();
partb.add("Samuel Rutherford/scriptures-Thankfulness");
List<String> partc = new ArrayList<String>();
partc.add("Matthew Henry/Scriptures on - Faith");
partc.add("John Wesley/Scriptures on - Freedom");
partc.add("Charles Simeon/Scriptures on -Protection");
partc.add("Christmas Evans/Scriptures on - Guidance");
listDataChild.put(listDataHeader.get(0), parta); // Header, Child data
listDataChild.put(listDataHeader.get(1), partb);
listDataChild.put(listDataHeader.get(2), partc);
}
}
there are three list i.e part a , part b and part c now by clicking on part a i will get four child list by clicking on first child list i.e Sweet Hour of prayer new activity should open.

Try Below Code:
public class MyActivity extends Activity implements ExpandableListView.OnChildClickListener
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.event_mainactivity);
mExpandableListView = (ExpandableListView) findViewById(R.id.expandableListView);
ExpandableListAdapter adapter = new ExpandableListAdapter(this,
mExpandableListView, mGroupCollection);
mExpandableListView.setAdapter(adapter);
mExpandableListView.setOnChildClickListener(this);
}
#Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
{
Toast.makeText(getApplicationContext(), "Go to Activity :: "+childPosition, Toast.LENGTH_LONG).show();
return true;
}
}

There is a onChildClickListener for ExpandableListView. Check this code:
yourListView.setOnChildClickListener(new OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// Open activity using intent...
return false;
}
});
Hope it helps!

Set onChildItemClickListner for ExpadableListView?

So, I was wondering if there is any method to set Up onclickListner for Expandable List view..
I know that it is possible when you haven't implement Child data with "HashMap".
here is My code. I tired all possible onclick listeners for hashmap method. but no success yet.
enter code here
package com.prashant.dfs;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ExpandableListView;
public class Chapter_1_full extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> ListDataHeader;
HashMap<String,List<String>> listDataChild;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chapter_1_full);
//get the listView(expand)
expListView = (ExpandableListView) findViewById(R.id.ch1_expand);
//prepareDataList
prepareListData();
listAdapter=new ExpandableListAdapter(this, ListDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
}
private void prepareListData() {
ListDataHeader = new ArrayList<String>();
listDataChild=new HashMap<String, List<String>>();
//Adding child Data
ListDataHeader.add("1.1 Introductin");
ListDataHeader.add("1.2 DataType");
ListDataHeader.add("1.3 ADT");
List<String> Intro = new ArrayList<String>();
Intro.add("WHAT is DFS");
Intro.add("Algorithem");
Intro.add("Flowchart");
List<String> datatype = new ArrayList<String>();
datatype.add("WHAT is DFS");
datatype.add("Algorithem");
datatype.add("Flowchart");
List<String> ADT = new ArrayList<String>();
ADT.add("WHAT is DFS");
ADT.add("Algorithem");
ADT.add("Flowchart");
listDataChild.put(ListDataHeader.get(0),Intro);
listDataChild.put(ListDataHeader.get(1),datatype);
listDataChild.put(ListDataHeader.get(2),ADT);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.chapter_1_full, menu);
return true;
}
}

Well, assuming your adapter is correctly implementing its methods...
expandableListView.setOnChildClickListener(new OnChildClickListener() {
#Override
public boolean onChildClick(final ExpandableListView parent, final View view, final int groupPosition, final int childPosition,
final long identifier) {
final Object childObj = parent.getExpandableListAdapter().getChild(groupPosition, childPosition);
if (childObj != null) {
// Do your magic
}
return true;
}
});