Develop Reference

How to fit a LinearLayout in a ScrollView?

Earlier on I asked a question about how to reach the last item of a scrollview and someone pointed out that I should be using NestedScrollView, at first it worked but now it's not what I want.
I want to fit my list of item in the ScrollView so only that part of the screen can be scrolled and the other parts stay at their place (the 3 TextView)
So basically my xml file is like this :
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/cl_framgnent_detail_apero"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary"
tools:context=".ui.home.AperoDetailFragment">
<TextView
android:id="#+id/name_apero"
/>
<TextView
android:id="#+id/date_apero"
/>
<TextView
android:id="#+id/ingredient_title_apero"
/>
<ScrollView
android:id="#+id/rv_apero_ingredient"
android:layout_width="408dp"
android:layout_height="603dp"
android:fillViewport="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="#+id/ingredient_title_apero"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/ingredient_title_apero"
app:layout_constraintVertical_bias="1.0">
<LinearLayout
android:id="#+id/vertical_layout_ingredient"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
And in my Java code I try to populate my list with the following code :
public class AperoDetailFragment extends Fragment {
private View root;
private Apero detailApero;
public AperoDetailFragment(Apero apero) {
this.detailApero = apero;
}
#Override
public View onCreateView(#NonNull final LayoutInflater inflater,
final ViewGroup container, Bundle savedInstanceState) {
root = inflater.inflate(R.layout.fragment_detail_apero, container, false);
TextView name = (TextView) root.findViewById(R.id.name_apero);
name.setText(detailApero.getName());
TextView date = (TextView) root.findViewById(R.id.date_apero);
date.setText(detailApero.getDate());
LinearLayout ll = (LinearLayout) root.findViewById(R.id.vertical_layout_ingredient);
LinearLayout a = new LinearLayout(root.getContext());
ConstraintLayout.LayoutParams lparams = new ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.MATCH_PARENT, ConstraintLayout.LayoutParams.MATCH_PARENT);
a.setLayoutParams(lparams);
a.setOrientation(LinearLayout.VERTICAL);
for (int i = 0; i < 20; i++) {
Button b = new Button(root.getContext());
b.setText("Button " + i);
a.addView(b);
}
ll.addView(a);
return root;
}
}
The problem is that the item are covering the whole screen instead of staying in the parent container (ScrollView) :
How can I fit my list of item to stay in the parent ?

If this is your actual code, then it might help to set constraints to the text views too.
Also, if your ScrollView has a fixed height, then you should remove either the top or bottom constraint. So if you want it to stick to the bottom, remove the top constraint.

I solved this with removing the ScrollView and using a ListView

Dynamically populate a dialogue inside a fragment

I have created a fragment and want to start a dialogue on a button click on which i would display n numbers of texts distributed vertically using Linear layout vertical orientation. To begin with i have created a textview which i am populating dynamically. But i get a null pointer exception saying the any of the layout i referenced here points to NULL.
View view,tempView;
TextView myName, myPhNo, myEmail, myDob;
ImageButton selectRingTone;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_profile, container, false);
tempView = inflater.inflate(R.layout.fragment_selectsong, container, false);
myName = (TextView)view.findViewById(R.id.username);
myPhNo = (TextView)view.findViewById(R.id.userPhNo);
myEmail = (TextView)view.findViewById(R.id.useremailId);
myDob = (TextView)view.findViewById(R.id.userdob);
selectRingTone = (ImageButton)view.findViewById(R.id.selectRingTone);
setUserProfileData();
//setUserTextStatus();
//setUserAudioStatus();
selectRingTone.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
chooseAndSetRingTone();
}
});
return view;
}
private void chooseAndSetRingTone(){
final Dialog fbDialogue = new Dialog(view.getContext(), android.R.style.Theme_Black);
fbDialogue.getWindow().setTitle("Select your audio status song");
fbDialogue.getWindow().setBackgroundDrawable(new ColorDrawable(Color.argb(100, 0, 0, 0)));
fbDialogue.setContentView(R.layout.fragment_selectsong);
getSongsAndFillDialogue();
fbDialogue.setCancelable(true);
fbDialogue.show();
}
private void getSongsAndFillDialogue(){
LayoutInflater inflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout container = (LinearLayout) tempView.findViewById(R.id.eachRingToneSong);
TextView tv = new TextView(tempView.getContext());
tv.setText("Hi hello");
Button b = new Button(tempView.getContext());
b.setText("abcde");
container.addView(tv);
container.addView(b);
}
XML Code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainLyt"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ScrollView
android:id="#+id/scrollCotainerForRingToneSongs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/eachRingToneSong"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!--<TextView
android:id="#+id/song1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="abcde"
/>-->
</LinearLayout>
</ScrollView>
</RelativeLayout>

you are creating View for your Dialog in onCreateView method:
tempView = inflater.inflate(R.layout.fragment_selectsong, container, false);
and fulfilling it using getSongsAndFillDialogue method, but you are setting for your Dialog another new instance passing only resource id:
fbDialogue.setContentView(R.layout.fragment_selectsong);
when you are passing just id then Dialog is inflating this layout by itself (just like you). So there are two layouts created, one in Activity - fulfilled, and one created "automatically" by setContentView method, but not touched at all by your methods (so it stays empty)
instead of passing resource id pass already prepared tempView, like below:
fbDialogue.setContentView(tempView);

Not able to modify fragment data

I have the following fragment working in view pager:
<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"
android:background="#color/window_background"
android:id="#+id/font"
tools:context="com.cuentos.lib.cuentosmusicales.Libro">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:gravity="center"
android:id="#+id/titleBook"
android:textSize="25sp"
android:textColor="#2211CC"
android:text="#string/hello_blank_fragment" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/titleBook"
android:id="#+id/textBook"
android:textSize="15sp"
android:textColor="#44BB11"
android:text="#string/hello_blank_fragment" />
</RelativeLayout>
and i want to modify textview values from fragment class
public class Libro extends Fragment {
String titleLibro;
String text;
TextView title, text1;
public Libro() {}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_libro, container, false);
title = (TextView) view.findViewById(R.id.titleBook);
text1 = (TextView) view.findViewById(R.id.textBook);
title.setText("hi friends");
text1.setText("text");
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_libro, container, false);
}
}
So, I detect im not able to change data because there is no change, so how I can instanciate textview in fragment?

First, you're inflating your view two times. There's one on the first line of the onCreateView, which is the one that you modify the TextViews, but in the return statement you create and return another, you're not returning the one you modified, but a new one instead, so the view that will be presented in the UI is the not modified.
Also, you're calling the findViewById in the wrong lifecycle stage. Notice that onCreateView returns the view that will be present in your fragment. It's not possible to retrieve a view component like yours TextViews that way, because the view itself doesn't exists yet.
The right method to modify your view components is in the onViewCreated:
#Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
title = (TextView) view.findViewById(R.id.titleBook);
text1 = (TextView) view.findViewById(R.id.textBook);
title.setText("hi friends");
text1.setText(text);
}

Try setting the text when overriding your Fragments onActivityCreated or onResume methods.

Can't get my TextView to update in a fragment

I have tried everything I can possibly think of, I have tried many solutions in Stack as well. None seem to resolve my issue. I am trying to pass a string that I passed from an earlier intent (parsed JSON data). Everytime I call set text I get a Null Pointer Exception, I have tried using a method to set the text as well as just setting it. Any assistance would be greatly appreciated.
This is the fragment I am trying to update.
public class HomeFragment extends Fragment{
TextView tv;
public HomeFragment(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LayoutInflater lf = getActivity().getLayoutInflater();
View rootView = lf.inflate(R.layout.fragment_home, container, false);
tv = (TextView) rootView.findViewById(R.id.accountName);
tv.setText("test");
return rootView;
}
}
I just put a regular string in to test. Here is the XML.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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="Large Text"
android:id="#+id/lblCompany"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="71dp" />
</RelativeLayout>
Thanks In advance for absolutely any help.

This is the id set on your TextView in xml:
android:id="#+id/lblCompany"
This is the id you are searching for in onCreateView:
tv = (TextView) rootView.findViewById(R.id.accountName);
The ids need to match for you to update the text in that particular TextView. Try
tv = (TextView) rootView.findViewById(R.id.lblCompany);
instead.

Changing Background color of a view inside a Fragment

Ok, this is my new problem;
I am trying to change the background color of a View inside a Fragment on touch Event.
It is already setup and working fine. But it seems the background just won't change of color.
I do suspect this happens because this view has also other views on it on fill parent So even if it changes color I won't be able to see it.
Anyhow I have already set up those views color to Color.TRANSPARENT but it still does not work...
Here is my xml file:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
android:id = "#+id/lay_1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/position"
android:id="#+id/pos"/>
<ViewFlipper
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/pos"
android:id="#+id/flipper_1"
>
<include layout="#layout/cart"/>
<include layout="#layout/ang"/>
<include layout="#layout/data_graph"/>
</ViewFlipper>
If you need more information don't mind asking for it.
Thanks a lot.
Luis.

I had a similar issue and you should try to create a method called at the oncreate of the fragment to update the inside of the fragment view (background color, text...)
ex:
public static LinearLayout getcolor(LayoutInflater inflater, ViewGroup container, boolean bf){
int i;
View v;
TextView t;
LinearLayout ll;
int r = (int)Math.round(Math.random()*255+1);
int g = (int)Math.round(Math.random()*255+1);
int b = (int)Math.round(Math.random()*255+1);
i=Color.argb(200,r,g,b);
if(bf){
ll = (LinearLayout )inflater.inflate(R.layout.fragment_card_front, container, false);
v=ll.findViewById(R.id.frag_card_front);
v.setBackgroundColor(i);
t=(TextView) ll.findViewById(R.id.textf);
t.setText(""+i);
}
else{
ll = (LinearLayout )inflater.inflate(R.layout.fragment_card_back, container, false);
v=ll.findViewById(R.id.frag_card_back);
v.setBackgroundColor(i);
t=(TextView) ll.findViewById(R.id.textb);
t.setText(""+i);
}
return ll;
}
public static class CardFrontFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LinearLayout ll = (LinearLayout ) getcolor(inflater, container,true);
return ll;
}
}
public static class CardBackFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LinearLayout ll = (LinearLayout ) getcolor(inflater, container,false);
return ll;
}
}