Develop Reference

How to use one button to getText and setText to 3 different EditTexts and TextViews

It's quite simple. I have a button that has an onClickListener which takes a text from EditText, hides it and sets it to TextView which it shows in the same place.
Now, i want to do that to 2 more different edit texts and text views with the same button. Code below.
XML with my buttons:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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:context = ".profil"
android:orientation = "vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="230dp"
android:background="#color/pozadina"
android:id="#+id/rltv">
<ImageView
android:id="#+id/slikaProfil"
android:layout_width="130dp"
android:layout_height="160dp"
android:src="#drawable/profilna"
android:layout_centerInParent="true"/>
<TextView
android:id="#+id/textProfil1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/userProfil"
android:layout_below="#+id/slikaProfil"
android:layout_centerInParent="true"
android:textSize="20sp"
android:textStyle="bold"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_below="#+id/rltv">
<TextView
android:id="#+id/imeProfil"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Account info"
android:textSize="30sp"
android:textStyle="bold"
android:layout_marginLeft="50dp"
android:layout_marginTop="30dp"
android:layout_marginBottom="10dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ime i prezime"
android:layout_marginLeft="70dp"
android:drawableLeft="#drawable/profil"
android:drawablePadding="5dp"
android:id="#+id/imeProfil1"
android:textSize="16sp"
android:layout_below="#+id/imeProfil"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Upisite ime i prezime"
android:layout_marginTop="-5dp"
android:layout_marginLeft="70dp"
android:id="#+id/imeProfil2"
android:textSize="16sp"
android:background="#null"
android:layout_below="#+id/imeProfil1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Telefon"
android:layout_marginLeft="70dp"
android:drawableLeft="#drawable/telefon"
android:drawablePadding="5dp"
android:id="#+id/telefonProfil1"
android:textSize="16sp"
android:layout_below="#+id/imeProfil2"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Upisite broj telefona"
android:layout_marginTop="-5dp"
android:layout_marginLeft="70dp"
android:id="#+id/telefonProfil2"
android:textSize="16sp"
android:background="#null"
android:layout_below="#+id/telefonProfil1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="E-mail"
android:layout_marginLeft="70dp"
android:drawableLeft="#drawable/mail"
android:drawablePadding="5dp"
android:id="#+id/mailProfil1"
android:textSize="16sp"
android:layout_below="#+id/telefonProfil2"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Upisite e-mail"
android:layout_marginTop="-5dp"
android:layout_marginLeft="70dp"
android:id="#+id/mailProfil2"
android:textSize="16sp"
android:background="#null"
android:layout_below="#+id/mailProfil1"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Adresa"
android:layout_marginLeft="70dp"
android:drawableLeft="#drawable/adresa"
android:drawablePadding="5dp"
android:id="#+id/adresaProfil1"
android:textSize="16sp"
android:layout_below="#+id/mailProfil2"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Upisite adresu"
android:layout_marginTop="-5dp"
android:layout_marginLeft="70dp"
android:id="#+id/adresaProfil2"
android:textSize="16sp"
android:background="#null"
android:layout_below="#+id/adresaProfil1"
/>
<Button
android:id="#+id/prihvati"
android:layout_width="150dp"
android:layout_height="70dp"
android:layout_below="#+id/adresaProfil2"
android:layout_marginLeft="70dp"
android:text="#string/submit"
android:onClick="zamijeni"/>
</RelativeLayout>
</RelativeLayout>
My java file:
public class profil extends Fragment {
private Button dugme4;
private TextView text1;
private EditText text2;
public profil(){
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.activity_profil, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
text1 = view.findViewById(R.id.imeProfil1);
text2 = view.findViewById(R.id.imeProfil2);
dugme4 = view.findViewById(R.id.prihvati);
text2.setVisibility(View.INVISIBLE);
dugme4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String tekst = text2.getText().toString();
if (text1.getVisibility()== View.VISIBLE){
text1.setVisibility(View.INVISIBLE);
text2.setVisibility(View.VISIBLE);
}else if (text2.getVisibility() == View.VISIBLE){
text2.setVisibility(View.INVISIBLE);
text1.setVisibility(View.VISIBLE);
text1.setText(tekst);
}
}
});
}
}
So as you see i have an if function that on click gets the text, makes the edit text invisible and text visible and at the end sets the text to the textView.
Should i do a few more if functions or should it be done differently.

You should implement the same logic to access the text from EditText and display it in the TextView, you can make a function which should be called on the click of this button.

You can achive this more efficiently by use only a edittext.. no need to use text view.. I am giving a sample demo below
public class profil extends Fragment {
private Button dugme4;
//private TextView text1;
private EditText text2;
public profil(){
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.activity_profil, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// text1 = view.findViewById(R.id.imeProfil1);
text2 = view.findViewById(R.id.imeProfil2);
dugme4 = view.findViewById(R.id.prihvati);
// text2.setVisibility(View.INVISIBLE);
dugme4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (text2.isEnabled()){
//make it not editable and non focusable
text2.setEnable(false);
text2.setCursorVisible(false);
//for clearing underline of editText so that it looks like textview
text2.setBackgroundResource(android.R.color.transparent);
}else{
text2.setEnabled(true);
text2.setCursonVisible(true);
// set any color what you want as underline
text2.setBackgroundResource(android.R.color.black);
}
}
});
}
}
Try it.hope it will solve your problem by reducing extra element and complexity.

Fragment over listview activity [duplicate]

This question already has answers here:
Fragment won't launch
(2 answers)
Closed 5 years ago.
I am pretty new to android development, so please don't flame me for stupid questions/mistakes!
I have a listview inside my activity, but i want to open up a fragment when a frame in the listview is clicked on. I have the onclick working, but it is not launching the new activity.
I'll include my code below.
This is the oncreate
protected void onCreate (Bundle savedInstanceState)
{
//Fragment fragment_blank2=new SomeFragment();
e = myBadData.getData();
super.onCreate(savedInstanceState);
setContentView(R.layout.event_list);
events=(ListView) findViewById(R.id.dayList);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,e);
events.setAdapter(adapter);
events.setOnItemClickListener(this);
}
this is the onclick
public void onItemClick(AdapterView<?> adapterView, View view, final int i, long l)
{
myBadData.setId(i);
Fragment fr = new event_description();
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.add(R.id.eventdescription, fr);
}
this is the XML of the fragment
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id = "#+id/eventdescription"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="layout.BlankFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="137dp"
android:text="#string/event_name"
android:textSize="26sp"
android:layout_gravity="top"
android:gravity="top|center"
android:paddingTop="10dp"
android:id="#+id/textView"
android:background="#android:color/holo_orange_light"
android:textColor="#android:color/black"
android:layout_weight="1.08" />
<TextView
android:text="#string/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/date"
android:layout_marginTop="#dimen/activity_top_margin"
android:layout_marginLeft="#dimen/activity_side_margin"
android:textSize="18sp"
android:drawableTint="#android:color/background_dark" />
<TextView
android:text="#string/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/time"
android:layout_marginTop="70dp"
android:layout_marginLeft="#dimen/activity_side_margin"
android:textSize="18sp" />
<TextView
android:text="#string/cost"
android:layout_gravity="right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/cost"
android:layout_marginTop="#dimen/activity_top_margin"
android:layout_marginRight="70dp"
android:textSize="18sp"/>
<TextView
android:text="#string/address"
android:layout_gravity="right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/address"
android:layout_marginTop="70dp"
android:layout_marginRight="60dp"
android:textSize="18sp" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="135dp"
android:layout_marginLeft="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<TextView
android:id="#+id/tv_long"
android:paddingTop="10dp"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="#string/sample_text"
android:textSize="18sp"
android:layout_weight="1.08">
</TextView>
</LinearLayout>
</ScrollView>
<Button
android:text="#string/add_to_calendar"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:id="#+id/button2"
android:layout_gravity="center_horizontal"
android:layout_marginTop="95dp"/>
</FrameLayout>
here is the class of the fragment
public class event_description extends Fragment
{
#Nullable
//#Override
public View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate (R.layout.event_description, container, false);
Bundle args = getArguments();
String arg = args.getString(eventList.KEY_NAME);
//return super.(R.layout.event_description, container, false);
return view;
}
public View getView() {
return getView();
}
}

For Your Activity XML
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/my_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- TODO: Update blank fragment layout -->
<ListView
android:id="#+id/dayList"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</FrameLayout>
And Pass Activity's Container in FramgmentTransaction
public void onItemClick(AdapterView<?> adapterView, View view, final int i, long l)
{
myBadData.setId(i);
Fragment fr = new event_description();
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
//Your Container of Activity
fragmentTransaction.add(R.id.my_frame, fr);
fragmentTransaction.commit();
}
and Don't forgot to commint it.
No need to use framgment's FrameLayout as a container..

Android - Call Method With A Button From XML

I've got an app based on Sliding Tabs layout. I want to call the addMedicine method in the PageFragment class from an XML layout with a Button. The issue is that i cannot assign the method to the Button onClick event.
Here's the PageFragment class:
public class PageFragment extends Fragment {
public static final String ARG_PAGE = "ARG_PAGE";
private int mPage;
// TEMP VARIABLES //
ListView ItemsLst;
String[] Items = {"Medicine 1", "Medicine 2", "Medicine 3"};
TextView output;
EditText nameFld;
EditText formatFld;
EditText amountFld;
EditText exp_dateFld;
EditText timeFld;
DBManager dbAdapt = new DBManager(getActivity());
public static PageFragment newInstance(int page) {
Bundle args = new Bundle();
args.putInt(ARG_PAGE, page);
PageFragment fragment = new PageFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPage = getArguments().getInt(ARG_PAGE);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = null;
switch(mPage)
{
case 1:
view = inflater.inflate(R.layout.layout_sqltest, container, false);
nameFld = (EditText) view.findViewById(R.id.nameFld);
formatFld = (EditText) view.findViewById(R.id.formatFld);
amountFld = (EditText) view.findViewById(R.id.amountFld);
exp_dateFld = (EditText) view.findViewById(R.id.exp_dateFld);
timeFld = (EditText) view.findViewById(R.id.timeFld);
return view;
case 2:
view = inflater.inflate(R.layout.layout_settings, container, false);
return view;
case 3:
view = inflater.inflate(R.layout.layout_info, container, false);
return view;
}
return view;
}
public void addMedicine() // The method i want to call
{
String name = nameFld.getText().toString();
String format = formatFld.getText().toString();
int amount = Integer.parseInt(amountFld.getText().toString());
String exp_date = exp_dateFld.getText().toString();
String time = timeFld.getText().toString();
long id = dbAdapt.addMedicine(name, format, amount, exp_date, time);
}
}
And here is the layout_sqltest XML file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Name"
android:id="#+id/nameLbl"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/nameFld"
android:layout_gravity="center_horizontal"
android:inputType="text" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Format"
android:id="#+id/formatLbl"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/formatFld"
android:layout_gravity="center_horizontal"
android:inputType="text" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Amount"
android:id="#+id/amountLbl"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/amountFld"
android:layout_gravity="center_horizontal"
android:inputType="text" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Expiration Date"
android:id="#+id/exp_dateLbl"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/exp_dateFld"
android:layout_gravity="center_horizontal"
android:inputType="text" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Time"
android:id="#+id/timeLbl"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/timeFld"
android:layout_gravity="center_horizontal"
android:inputType="text" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Medicine"
android:id="#+id/addMedicineBtn"
android:layout_gravity="center_horizontal" />
</LinearLayout>
The addMedicineBtn is the button i want to call the method with.
Someone can help me? I really need that!
Thank you in advance!
EDIT: I tried giving to addMedicine method the View param, but it still doesn't appear in the available methods for the addMedicineBtn in the onClick properties (I'm using Android Studio).

Try to use onClickListener
view.findViewById(R.id.addMedicineBtn).setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
addMedicine();
}
});

You must add tools:context="PageFragment" line to the container (LinearLayout) of PagerFragment's layout file (layout_sqltest). Then onClick() method will find methods in PagerFragment class.

Why I am getting NullPointerException on ImageView?

My code is as follows:
activity_for_me.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="#+id/recco_list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
<ImageView
android:id="#+id/checkin"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="20dp"
android:onClick="ClickCheckIn"
android:src="#drawable/checkin" />
</RelativeLayout>
recco_list.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#layout/nine_patch" >
<ImageView
android:id="#+id/outlet_icon"
android:layout_marginLeft="15dp"
android:layout_height="55dp"
android:layout_width="55dp"
android:layout_marginTop="10dp"/>
<TextView
android:id="#+id/distance"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="15dp"
android:hint="Distance"
/>
<TextView
android:id="#+id/outlet_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_marginLeft = "15dip"
android:hint="outlet"
/>
<TextView
android:id="#+id/reward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/outlet_name"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_marginLeft = "15dip"
android:layout_marginTop="5dp"
android:textColor="#color/abc_search_url_text_holo"
android:hint="Reward"
/>
<View
android:id="#+id/rule"
android:layout_below="#id/reward"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_width="fill_parent"
android:layout_marginLeft = "15dip"
android:layout_height="1dp"
android:background="#c0c0c0"/>
<ImageView
android:id="#+id/favourite_icon"
android:layout_below="#id/rule"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:layout_height="15dp"
android:layout_width="15dp"
android:src="#drawable/heart_empty"/>
<ImageView
android:id="#+id/loc_icon"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_below="#id/rule"
android:layout_marginLeft = "15dip"
android:layout_marginTop="5dp"
android:layout_toRightOf="#id/outlet_icon"
android:src="#drawable/map_pointer"/>
<TextView
android:id="#+id/locality"
android:layout_toRightOf="#id/loc_icon"
android:layout_toLeftOf="#id/distance"
android:layout_below="#id/rule"
android:layout_marginRight="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft = "5dip"
android:layout_marginTop="5dp"
android:hint="Locality"
/>
</RelativeLayout>
Activity.java
public class ForMeActivity extends Fragment {
#SuppressLint("ClickableViewAccessibility")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RelativeLayout rootView = (RelativeLayout) inflater.inflate(
R.layout.activity_for_me, container, false);
ImageView favourite_heart = (ImageView) rootView
.findViewById(R.id.favourite_icon);
favourite_heart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Toast.makeText(YourActivityName.this,
// "The favorite list would appear on clicking this icon",
// Toast.LENGTH_LONG).show();
System.out.println("Favourite Icon clicked");
}
});
list = (ListView) rootView.findViewById(R.id.recco_list);
ImageView check_in_img = (ImageView) rootView
.findViewById(R.id.checkin);
ImageView outlet_logo = (ImageView) rootView
.findViewById(R.id.outlet_icon);
final String data = getArguments().getString("data");
ForMeFile = new File(getActivity().getExternalFilesDir(filepath),
filename);
final String cookie = getArguments().getString("cookie");
System.out.print(cookie);
check_in_img.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in = new Intent(getActivity(), CheckInView.class);
startActivity(in);
System.out.println("Checkin Icon clicked");
}
});
}
I want to change image for favourite_icon ImageView when I click on it. But as soon as I click on the icon I get NullPointerException. What is the reason that click of check_in_img is working but click of favourite_icon is not working even though the current layout is the one which contains favourite_icon? Other sources of SO says to check the same.

favourite_icon is a part of recco_list.xml and you are trying to find it in activity_for_me.xml. The view does not exist there and hence, the exception.
R.id.favourite_icon is not there in activity_for_me.xml.
And if you want to access the items in the listview, I suggest you read about ListView and getView().

Fragment UI components null TextViews

New android developer here. I am trying to create a dynamic UI that loads based on the users selection of a RadioGroup. Based on their selection, one of 3 possible fragments will be loaded into a LinearLayout section. This is my first attempt at my own sample problem that is not just a walk-through tutorial. Here is the main activity:
public class BaseConverter extends Activity {
RadioGroup convert;
Fragment toFragment;
RadioGroup toRadioGroup = null;
TextView inputDisplay = null;
TextView outputDisplay = null;
TextView resultTitle = null;
#Override
public void onCreate(Bundle sIS) {
super.onCreate(sIS);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.setContentView(R.layout.base_converter);
convert = (RadioGroup) this.findViewById(R.id.bc_convert_group);
convert.setOnCheckedChangeListener(new ConvertListener());
FragmentManager fm = getFragmentManager();
FragmentTransaction converterFragment = fm.beginTransaction();
ConvertEmptyFragment emptyTo = new ConvertEmptyFragment();
converterFragment.replace(R.id.bc_converter_fragment, emptyTo);
converterFragment.commit();
FragmentTransaction toFragment = fm.beginTransaction();
ConvertEmptyFragment emptyConverter = new ConvertEmptyFragment();
toFragment.replace(R.id.bc_to_fragment, emptyConverter);
toFragment.commit();
}
#Override
public void onResume() {
convert.clearCheck();
super.onResume();
}
#Override
public void onPause() {
convert.clearCheck();
super.onPause();
}
// I put a little null check so you can see how I'm trying to access the TextViews and what results
public void updateUIComponents(){
View converterView = this.findViewById(R.id.bc_converter_fragment);
inputDisplay = (TextView)converterView.findViewById(R.id.bc_display_input);
outputDisplay = (TextView)converterView.findViewById(R.id.bc_display_output);
if (inputDisplay == null){
Log.d("BaseConverter", "inputDisplay == null");
} else {
Log.d("BaseConverter", "inputDisplay != null");
}
}
class ConvertListener implements OnCheckedChangeListener {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
Fragment toFragment;
Fragment converterFragment;
switch (checkedId) {
case R.id.bc_convert_binary:
toFragment = new ConvertRBFragmentBinary();
converterFragment = new ConverterFragmentBinary();
break;
case R.id.bc_convert_decimal:
toFragment = new ConvertRBFragmentDecimal();
converterFragment = new ConverterFragmentDecimal();
break;
case R.id.bc_convert_hex:
toFragment = new ConvertRBFragmentHex();
converterFragment = new ConverterFragmentHex();
break;
default:
toFragment = new ConvertEmptyFragment();
converterFragment = new ConvertEmptyFragment();
break;
}
FragmentManager fm = getFragmentManager();
FragmentTransaction converterTransaction = fm.beginTransaction();
converterTransaction.replace(R.id.bc_converter_fragment, converterFragment);
converterTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
converterTransaction.commit();
FragmentTransaction toTransaction = fm.beginTransaction();
toTransaction.replace(R.id.bc_to_fragment, toFragment);
toTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
toTransaction.commit();
updateUIComponents();
}
}
So, based on what a user chooses, the proper fragments will be loaded into the respective LinearLayout sections. However, now I want to implement the business logic of the fragments (which is just integer base conversion; i.e. binary number to decimal...) but when I try to access the TextViews, as seen in the updateUIComponents method, I get null pointers. What am I missing?
Here's the ConverterFragmentBinary class for reference:
public class ConverterFragmentBinary extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sIS){
View v = inflater.inflate(R.layout.converter_fragment_binary, container, false);
return v;
}
}
and its respective xml layout for reference:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF000000"
android:gravity="center_horizontal"
android:orientation="vertical" >
<ImageView
android:id="#+id/bc_binary_converter_logo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dip"
android:maxHeight="30dip"
android:src="#drawable/binary_converter" />
<TextView
android:id="#+id/bc_display_input"
style="#style/input_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dip"
android:layout_marginLeft="15dip"
android:layout_marginRight="15dip"
android:layout_marginTop="5dip"
android:gravity="center_vertical|right"
android:lines="1"
android:minHeight="30sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FF000000"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/button_num_0"
style="#style/op_button_land"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:gravity="center"
android:onClick="num0"
android:text="#string/num_0" />
<Button
android:id="#+id/button_num_1"
style="#style/op_button_land"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:gravity="center"
android:onClick="num1"
android:text="#string/num_1" />
</LinearLayout>
<TextView
android:id="#+id/bc_result_title"
style="#style/radio_button_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_marginTop="10dip"
android:gravity="left"
android:text="#string/choose_convert" />
<TextView
android:id="#+id/bc_display_output"
style="#style/display_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dip"
android:layout_marginRight="15dip"
android:layout_marginTop="5dip"
android:gravity="center_vertical|right"
android:lines="1"
android:minHeight="30sp" />
</LinearLayout>
and then heres the main activity it gets loaded into:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/base_conversion_layout"
style="#style/layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="5"
android:baselineAligned="false"
android:gravity="center_vertical|left"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="2"
android:orientation="vertical" >
<TextView
style="#style/radio_button_header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/convert" />
<RadioGroup
android:id="#+id/bc_convert_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="5dip" >
<RadioButton
android:id="#+id/bc_convert_binary"
style="#style/radio_button"
android:text="#string/binary" />
<RadioButton
android:id="#+id/bc_convert_decimal"
style="#style/radio_button"
android:text="#string/decimal" />
<RadioButton
android:id="#+id/bc_convert_hex"
style="#style/radio_button"
android:text="#string/hex" />
</RadioGroup>
</LinearLayout>
<LinearLayout
android:id="#+id/bc_to_fragment"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="3"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/bc_converter_fragment"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="13"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
Thanks in advance and sorry for the long code blocks but I figured it was better to include more than less.

Also, you should inflate your Fragments layout to bring it from your XML to your Java code instead of simply referring it using findViewById() method.
So instead of doing this,
View converterView = this.findViewById(R.id.bc_converter_fragment);
Do this inside your onCreateView method of the fragment,
View converterView = infalter.inflate(R.id.bc_converter_fragment,null);
updateUIComponents(converterView);//call this methid and pass your view
new method looks like this,
public void updateUIComponents(View converterView){
inputDisplay = (TextView)converterView.findViewById(R.id.bc_display_input);
outputDisplay = (TextView)converterView.findViewById(R.id.bc_display_output);
if (inputDisplay == null){
Log.d("BaseConverter", "inputDisplay == null");
} else {
Log.d("BaseConverter", "inputDisplay != null");
}
}