Develop Reference

How to switch between 2 TextViews places on the layout?

I have an OnClickListener that listens to Button A clicks. I also have 2 TextViews below the Button.
I want that on every click on Button A, the 2 TextViews will switch their places between them, like this:
Before clicking:
TextView A
TextView B
After clicking:
TextView B
TextView A
How can I do it? Is there a special function that meant to do that? or some kind of a trick? Thanks!
actvity_main.xml:
<?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="fill_parent"
android:layout_height="fill_parent"
android:gravity="start"
tools:context="com.intap.tof.MainActivity">
<TextView
android:id="#+id/txtA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="20dp"
android:visibility="visible"/>
<TextView
android:id="#+id/txtB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_below="#+id/txtA
android:layout_marginTop="83dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:visibility="visible"
android:textSize="20dp" />
</RelativeLayout>
MainActivity.java:
txtA = (TextView) findViewById(R.id.txtA);
txtB = (TextView) findViewById(R.id.txtB);
float mAX = txtA.getX();
float mAY = txtA.getY();
float mBX = txtB.getX();
float mBY= txtB.getY();
txtA.setX(mBX);
txtA.setY(mBY);
txtB.setX(mAX);
txtB.setY(mAY);

Trick is changing the x and y axis of both views :
Your xml code:
<?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="fill_parent"
android:layout_height="fill_parent"
android:gravity="start"
tools:context="com.intap.tof.MainActivity">
<TextView
android:id="#+id/txtA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="20dp"
android:text="A"
android:tag="A"
android:clickable="true"
android:visibility="visible"/>
<TextView
android:id="#+id/txtB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_below="#+id/txtA"
android:text="B"
android:tag="B"
android:clickable="true"
android:layout_marginTop="83dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:visibility="visible"
android:textSize="20dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="switch"
android:id="#+id/btn1"
android:onClick="onClickButton"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
Java Code :
public class MainActivity extends Activity {
TextView txtA,txtB;
boolean _isOnTxtA;
Button btn1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtA = (TextView)findViewById(R.id.txtA);
txtB = (TextView)findViewById(R.id.txtB);
btn1 = (Button)findViewById(R.id.btn1);
}
public void onClickButton(View v)
{
float mPos1x,mPos1y,mPos2x,mPos2y;
mPos1x = txtB.getX();
mPos1y = txtB.getY();
mPos2x = txtA.getX();
mPos2y= txtA.getY();
if(_isOnTxtA)
{
txtB.setX(mPos2x);
txtB.setY(mPos2y);
txtA.setX(mPos1x);
txtA.setY(mPos1y);
_isOnTxtA = false;
}
else
{
txtB.setX(mPos2x);
txtB.setY(mPos2y);
txtA.setX(mPos1x);
txtA.setY(mPos1y);
_isOnTxtA= true;
}
}
}

View.bringToFront method may be useful.
Where your layout is like:
<LinearLayout>
<TextView A>
<TextView B>
</LinearLayout>
To call bringToFront on TextView A will bring it front (the last position in the parent LinearLayout).
<LinearLayout>
<TextView B>
<TextView A>
</LinearLayout>
For more detailed example, below is layout.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/text_holder"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="#+id/text_a"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/text_a" />
<TextView
android:id="#+id/text_b"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/text_b" />
</LinearLayout>
In your OnClickListener (in your Activity) call:
View textViewA = findViewById(R.id.text_a);
textViewA.bringToFront();
This should work.
Toggling behavior can be achieved by this application. For example:
ViewGroup textHolder = (ViewGroup) findViewById(R.id.text_holder);
textHolder.getChildAt(0).bringToFront();
ViewGroup.getChildAt(0) always returns the first child of the ViewGroup. So everytime you call bringToFront on the first child will be bring to front.

All previous answers do not work because you use a relative layout where a linear layout will suffice.
If you have to go RelativeLayout, do the following in your click listener
TextView textA = (TextView) findViewById(R.id.txtA);
TextView textB = (TextView) findViewById(R.id.txtB);
RelativeLayout.LayoutParams textALayoutParams = (RelativeLayout.LayoutParams) textA.getLayoutParams();
textALayoutParams.addRule(RelativeLayout.BELOW, R.id.txtB);
textA.setLayoutParams(textALayoutParams);
RelativeLayout.LayoutParams textBLayoutParams = (RelativeLayout.LayoutParams) textB.getLayoutParams();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
textBLayoutParams.removeRule(RelativeLayout.BELOW);
} else {
textBLayoutParams.addRule(RelativeLayout.BELOW,0);
}
textB.setLayoutParams(textBLayoutParams);
This will place A under B. You can do the same for reversing.

Showing Android Wear style AlertDialog

I'm looking for a way to recreate the alert dialog in the Setting application of Android Wear:
Which is swipe to dismissable.
But instead, what I got is this:
Just a barebone Android dialog. How can I show the AlertDialog in the Settings.apk style? (Which I think must be default for Android Wear application)

I found no default way to do this, also setting a custom view to an AlertDialog did not look good. You can still try though, maybe a different Theme works.
What I did was create a new Activity and create my own layout which looks like this:
<?xml version="1.0" encoding="utf-8"?>
<android.support.wearable.view.BoxInsetLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="10dp"
app:layout_box="all">
<TextView
android:id="#+id/tv_longtext"
android:layout_width="match_parent"
android:layout_height="0sp"
android:layout_weight="1"
android:fontFamily="sans-serif-condensed"
android:gravity="bottom"
android:padding="5sp"
android:text="Ambient screen reduces battery life."
android:textSize="16sp" />
<TextView
android:id="#+id/tv_question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-condensed"
android:gravity="center_horizontal|top"
android:paddingBottom="15sp"
android:paddingTop="5sp"
android:text="Turn on?"
android:textSize="18sp" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5sp">
<android.support.wearable.view.CircledImageView
android:id="#+id/btn_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|bottom"
android:src="#drawable/ic_cross"
app:circle_color="#AFAFAF"
app:circle_radius="25dp"
app:circle_radius_pressed="20dp" />
<android.support.wearable.view.CircledImageView
android:id="#+id/btn_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|bottom"
android:src="#drawable/ic_tick"
app:circle_color="#0EB695"
app:circle_radius="25dp"
app:circle_radius_pressed="20dp" />
</FrameLayout>
</LinearLayout>
</android.support.wearable.view.BoxInsetLayout>
It looks just like the confirmation screen from the settings. Maybe it still needs some tweaks, but I think this is the way to go.

I had a similar problem and indeed I didn't find a default way to do this. I tried to use AlertDialogs for WearOs and they don't look well, because even if you pass them a custom view, the AlertDialog class crops the layout in some unexpected ways.
How I ended up solving the problem is using the Dialog class (AlertDialog's parent class) and passing it a custom view. The Dialog class doesn't alter the layout and you can attach the dialog to an activity's lifespan (which is the idea of dialogs, creating a custom activity doesn't fit with this requirement).
So you could create a function like this inside your activity:
private void showDialog() {
Dialog dialog = new Dialog(this);
View myLayout = getLayoutInflater().inflate(R.layout.my_layout_id, null);
Button positiveButton = myLayout.findViewById(R.id.positive_button);
positiveButton.setOnClickListener(
v -> {
/* Your action on positive button clicked. */
}
);
Button negativeButton = myLayout.findViewById(R.id.negative_button);
negativeButton.setOnClickListener(
v -> {
/* Your action on negative button clicked. */
}
);
dialog.setContentView(myLayout);
dialog.show();
}

I created a similar fragment with custom layout like this:
Kotlin code:
/**
* Created by nmbinh87#gmail.com on 4/12/21.
*/
class ConfirmationDialog private constructor() : DialogFragment(R.layout.confirmation_dialog) {
var listener: Listener? = null
var longMessage: String = ""
var shortMessage = ""
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
tv_longtext.text = longMessage
tv_question.text = shortMessage
tv_longtext.visibility = if (longMessage.isEmpty()) View.GONE else View.VISIBLE
tv_question.visibility = if (shortMessage.isEmpty()) View.GONE else View.VISIBLE
btn_cancel.setSafeOnClickListener {
dismiss()
listener?.onCancel()
}
btn_ok.setSafeOnClickListener {
dismiss()
listener?.onConfirm()
}
}
override fun onStart() {
super.onStart()
val params = dialog?.window?.attributes
params?.width = WindowManager.LayoutParams.MATCH_PARENT
params?.height = WindowManager.LayoutParams.MATCH_PARENT
dialog?.window?.attributes = params as WindowManager.LayoutParams
dialog?.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT));
}
open class Listener {
fun onCancel() {
}
open fun onConfirm() {
}
}
companion object {
fun show(
fm: FragmentManager,
longMessage: String = "",
shortMessage: String = "",
listener: Listener
) {
val fragment = ConfirmationDialog()
fragment.longMessage = longMessage
fragment.shortMessage = shortMessage
fragment.listener = listener
fragment.show(fm, fm::class.simpleName)
}
}
}
Layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.wearable.view.BoxInsetLayout 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:layout_width="match_parent"
android:background="#color/colorPrimaryDark"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="10dp"
app:layout_box="all">
<TextView
android:id="#+id/tv_longtext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:fontFamily="sans-serif-condensed"
android:gravity="center"
android:padding="5sp"
android:textColor="#color/white"
android:textSize="16sp"
tools:text="Ambient screen reduces battery life." />
<TextView
android:id="#+id/tv_question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-condensed"
android:layout_weight="1"
android:gravity="center"
android:paddingTop="5sp"
android:paddingBottom="15sp"
android:textColor="#color/white"
android:textSize="18sp"
tools:text="Turn on?" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5sp">
<android.support.wearable.view.CircledImageView
android:id="#+id/btn_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|bottom"
android:src="#drawable/ic_cc_clear"
app:circle_color="#AFAFAF"
app:circle_radius="25dp"
app:circle_radius_pressed="20dp" />
<android.support.wearable.view.CircledImageView
android:id="#+id/btn_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|bottom"
android:src="#drawable/ic_cc_checkmark"
app:circle_color="#0EB695"
app:circle_radius="25dp"
app:circle_radius_pressed="20dp" />
</FrameLayout>
</LinearLayout>
</android.support.wearable.view.BoxInsetLayout>
Usage:
ConfirmationDialog.show(
childFragmentManager,
"",
"Turn alarm off?",
object : ConfirmationDialog.Listener() {
override fun onConfirm() {
super.onConfirm()
turnAlarm(false)
}
})

How to get EditTextPreference's layout items id

I have a EditPreferences.class which extends preferenceactivity and my preferences.xml layout in my xml folder
in the xml layout i used EditTextPreference control which have layout et_layout.xml
my question is how can i get my textview id in my EditPreferences.class
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:title="#string/app_name" >
<PreferenceCategory
android:icon="#drawable/batitle"
android:textColor="#000000"
android:title="كۆرۈنۈش" >
<ListPreference
android:defaultValue="#string/result_fontsize_default"
android:dialogTitle="تاللاڭ"
android:entries="#array/result_fontsize_keys"
android:entryValues="#array/result_fontsize_values"
android:key="result_fontsize"
android:summary="ئىزدەش نەتىجىسىنىڭ كۆرۈنۈش چوڭلۇقى"
android:textColor="#000000"
android:title="خەت چوڭلۇقى" />
<EditTextPreference
android:dialogIcon="#drawable/batitle"
android:dialogTitle="editText"
android:key="tel"
android:layout="#layout/layout" />
<Preference />
</PreferenceCategory>
</PreferenceScreen>
layout
<?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="match_parent"
android:gravity="right"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
</LinearLayout>

Inflate you xml
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.linear_layout, null);
textView2 = (TextView) view.findViewById(R.id.textView2);
Try this, hope it would help you out

Try this,
SharedPreferences prefs;
String x = prefs.getString("tel",defaultString value);
textView.setText(x);

The reason why a simple findViewById in your EditPreferences.onCreate doesn't work is because your layout with the TextView is created inside of a ListView and there is a delay before that actually happens when the activity is launched.
I'm not sure this is the best way, but one way to handle the event of ListView item population is to handle the OnHierarchyChange event for the ListView object. If you put this in your onCreate, after the preference layout has been loaded from what I assume is a call to addPreferencesFromResource, it should work.
ListView list = (ListView) findViewById(android.R.id.list);
list.setOnHierarchyChangeListener(new ViewGroup.OnHierarchyChangeListener() {
#Override
public void onChildViewAdded(View parent, View child) {
TextView text = (TextView) child.findViewById(R.id.textView2);
if (text != null) {
text.setText("Something else here");
}
}
#Override
public void onChildViewRemoved(View view, View view2) {
}
});

get parent's view from a layout

I have a FragmentActivity with this layout:
<?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" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/menulabel"
android:textSize="24sp" />
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:layout_below="#+id/textView1"
android:hint="#string/search_title_hint" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/spinnersearch"
android:layout_below="#+id/editText1" />
<LinearLayout
android:id="#+id/layout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView2" >
<Spinner
android:id="#+id/spinner_search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:prompt="#string/spinnersearch" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/reset_search" />
</LinearLayout>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/buttonnewcat"
android:layout_below="#+id/layout1" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/buttondelcat"
android:layout_below="#+id/button2" />
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/buttoneditcat"
android:layout_below="#+id/button3" />
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/buttonnewtext"
android:layout_below="#+id/button4" />
<Button
android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/buttondeltext"
android:layout_below="#+id/button5" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<side.menu.scroll.ScrollerLinearLayout
android:id="#+id/menu_content_side_slide_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="#drawable/ab_solid_example"
android:orientation="horizontal" >
<ImageView
android:id="#+id/main_tmp_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/actionbar_background"
android:src="#drawable/download" />
</LinearLayout>
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bg_groud" />
</side.menu.scroll.ScrollerLinearLayout>
</RelativeLayout>
and the ScrollerLinearLayout class is something like this:
public class ScrollerLinearLayout extends LinearLayout {
// code of the class
}
How to access from ScrollerLinearLayout to the parent layout to get - for example - the editetxt? FragmentActivity and ScrollerLineraLayout are in different packages of the same projects.
I tried to use the getParent() function in this way within the ScrollerLinearLayout but it doesn't work.
RelativeLayout r = (RelativeLayout) this.getParent().getParent();
int w = r.findViewById(R.id.editText1).getLayoutParams().width;
Someone help me? Thanks!

The getParent method returns a ViewParent, not a View. You need to cast the first call to getParent() also:
RelativeLayout r = (RelativeLayout) ((ViewGroup) this.getParent()).getParent();
As stated in the comments by the OP, this is causing a NPE. To debug, split this up into multiple parts:
ViewParent parent = this.getParent();
RelativeLayout r;
if (parent == null) {
Log.d("TEST", "this.getParent() is null");
}
else {
if (parent instanceof ViewGroup) {
ViewParent grandparent = ((ViewGroup) parent).getParent();
if (grandparent == null) {
Log.d("TEST", "((ViewGroup) this.getParent()).getParent() is null");
}
else {
if (parent instanceof RelativeLayout) {
r = (RelativeLayout) grandparent;
}
else {
Log.d("TEST", "((ViewGroup) this.getParent()).getParent() is not a RelativeLayout");
}
}
}
else {
Log.d("TEST", "this.getParent() is not a ViewGroup");
}
}
//now r is set to the desired RelativeLayout.

If you are trying to find a View from your Fragment then try doing it like this:
int w = ((EditText)getActivity().findViewById(R.id.editText1)).getLayoutParams().width;

You can get ANY view by using the code below
view.rootView.findViewById(R.id.*name_of_the_view*)
EDIT: This works on Kotlin. In Java, you may need to do something like this=
this.getCurrentFocus().getRootView().findViewById(R.id.*name_of_the_view*);
I learned getCurrentFocus() function from: #JFreeman 's answer

The RelativeLayout (i.e. the ViewParent) should have a resource Id defined in the layout file (for example, android:id=#+id/myParentViewId). If you don't do that, the call to getId will return null. Look at this answer for more info.

Check my answer here
The use of Layout Inspector tool can be very convenient when you have a complex view or you are using a third party library where you can't add an id to a view

parent as View
fun View.printParentSize() {
log("parentWidth = ${(parent as View).sizeW}")
log("parentHeight = ${(parent as View).sizeH}")
}

This also works:
this.getCurrentFocus()
It gets the view so I can use it.

custom EditTextPreference: can't get TextView by id

I have created a custom EditTextPreference:
<EditTextPreference
android:key="alert_planed_edittext_preference"
android:title="#string/alert_planed_edittext_preference"
android:summary="#string/alert_planed_summary_edittext_preference"
android:dialogTitle="#string/alert_planed_dialog_title_edittext_preference"
android:numeric="integer"
android:layout="#layout/edit_text_preference_layout" />
the custom layout code:
<?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:id="#+id/alert_planed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginLeft="10dip"
android:text="5" >
</TextView>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="6dip"
android:layout_marginLeft="10dip"
android:layout_marginTop="6dip" >
<TextView
android:id="#+android:id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:fadingEdge="horizontal"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+android:id/summary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#android:id/title"
android:layout_below="#android:id/title"
android:maxLines="2"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
</RelativeLayout>
I just added the text view with id alert_planed.
In my preference activity i am trying to get the new EditTextPreference value and put it in my text view alert_planed.
I am getting the EditTextPreference value, that's ok. But when i set the text i got a null exception telling me that the TextView is null.
Here is my Preference code:
addPreferencesFromResource(R.xml.preferences);
mTextViewAlertPlanned = (TextView) findViewById(R.id.alert_planed);
findPreference("alert_planed_edittext_preference").setOnPreferenceChangeListener(new OnPreferenceChangeListener()
{
#Override
public boolean onPreferenceChange(
android.preference.Preference arg0, Object value) {
if(value != null)
{
Log.i("Preference","String.valueOf(value) ="+String.valueOf(value));
Log.i("Preference","mTextViewAlertPlanned ="+mTextViewAlertPlanned);
int myVal = Integer.parseInt(String.valueOf(value));
mTextViewAlertPlanned.setText(myVal);
}
return true;
}
});
How can i get my TextView correctly (the TextView is a part of the custom EditTextPreference layout)?

Simple Inflate you xml
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.custome_layout, null);
mTextViewAlertPlanned = (TextView) view.findViewById(R.id.alert_planed);

I had the same issue has you, and what worked for me was to create a class extending from EditTextPreference:
class CustomEditTextPreference constructor(
context: Context,
attrs: AttributeSet) : EditTextPreference(context, attrs) {
lateinit var tvTitle: TextView
lateinit var summary: TextView
override fun onBindViewHolder(holder: PreferenceViewHolder) {
super.onBindViewHolder(holder)
with(holder.itemView) {
// Here would go your ids
tvTitle = findViewById(R.id.tv_title)
summary = findViewById(R.id.tv_summary)
}
}
// Whenever you want to change the 'summary' you call this function and pass the value as parameter
fun changeSummary(value: String){
summary.text = value
}
}
In the preferenceFragment, instead of doing:
preference.summary = newValue.toString()
you just call the function:
changeSummary(newValue.toString())
Hope that works!