Develop Reference

Correct way to hide and show widgets?

In my app, I need to show and hide widgets like button and textview at a certain time.
and how I am doing is as the following:
private void hideviews() {
image.setVisibility(View.GONE); ///ImageView
title1.setVisibility(View.GONE);///TextView
title2.setVisibility(View.GONE);///TextView
title3.setVisibility(View.GONE);///TextView
title4.setVisibility(View.GONE);///TextView
title5.setVisibility(View.GONE);///TextView
}
private void showviews() {
image.setVisibility(View.VISIBLE);
title1.setVisibility(View.VISIBLE);///TextView
title2.setVisibility(View.VISIBLE);///TextView
title3.setVisibility(View.VISIBLE);///TextView
title4.setVisibility(View.VISIBLE);///TextView
title5.setVisibility(View.VISIBLE);///TextView
}
I don't think this is the correct way to do this.
Because I don't know how many widgets there will be.
Any guidance on how to correctly show widgets is really appreciated.

Get the reference to root layout, iterate through the childs, check if the view at certain index is instance of EditText(or View that you dont need to hide), if not hide it
RelativeLayout root = findViewById(R.id.root)
for(i=0,i<root.getChildCount()-1,i++){
if(! (root.getChildAt(i) instance of EditText)){
root.getChildAt(i).setVisibility(View.GONE)
}
}

Since you don't know how many testviews will be attached, then I believe that the best approach will be to:
get the reference of the parent view group (that contains all the
textviews),
loop through all the childs using getChildAt,
verify whether the object is an instance of TextView/ImageView and if so set its visibility according to your logic

Instead of hiding every widget separately hide the root layout.
RelativeLayout rootLayout;
rootLayout= (RelativeLayout) findViewById(R.id.root_layout);
and use something like this to control the visibility.
public void setLayoutInvisible() {
if (rootLayout.getVisibility() == View.VISIBLE) {
rootLayout.setVisibility(View.GONE);
}
}
public void setLayoutVisible() {
if (rootLayout.getVisibility() == View.GONE) {
rootLayout.setVisibility(View.VISIBLE);
}
}

Make an array of all the views that you want to show/hide:
View[] views = {image, title1, title2, title3, title4, title5};
and then use this to hide them:
for (View view : views) {
view.setVisibility(View.GONE);
}
and use this to show them:
for (View view : views) {
view.setVisibility(View.VISIBLE);
}
although you can combine the 2 code parts in a single procedure:
void fixViews(int state) {
for (View view : views) {
view.setVisibility(state);
}
}
and call it:
fixViews(View.GONE); or fixViews(View.VISIBLE);

How to reset other view style (button) or reset all button background in layout at once?

I`m have 3 button in layout. I wish that when click one button, the styles of the other 2 buttons was set to "default". In my example: background color.
Pressing button1 must change her style and resets the styles of other buttons.
The simplest solution is to set the style of each button, on each method call, but this is the simplest solution, if the layer is only 2-5 buttons, but if there will be 10-20?
In drawable/button_bg.xml i have selector with 2 state: default and state_selected.
Is it possible to reset (or set) all styles of all buttons in the layer (layout) instantly and without reloading the app?
Or, if the button is not pressed, assign the default style? Or something like layout.AllButtons.setDefaultStyle(true) (sorry for that)
When click on one button, need to change styles for other
As you see now state_selected not reset after new click on other button.

You can do it manually by iterating over layout and setting needed params like
private void unselectButtons(ViewGroup root, View except) {
int childCount = root.getChildCount()
for (int i=0; i < childCount; ++i) {
View child = root.getChildAt(i);
if (child instanceof ViewGroup) {
unselectButtons((ViewGroup)child,except);
} else if (child instanceof Button && child != except) {
child.setSelected(false);
}
}
}

disable all elements in a layout - Android

In my Android app there is a requirement that a number of UI elements should be disabled until a button click carryout. Can I disable all the UI elements in a layout by referring the layout without disable them one by one. Is it possible.Can some one help me.

You could disable all views recursively like this.
Just pass the layout as view to the method:
private void enableViews(View v, boolean enabled) {
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
for (int i = 0;i<vg.getChildCount();i++) {
enableViews(vg.getChildAt(i), enabled);
}
}
v.setEnabled(enabled);
}
Just run enableViews(view, false) to disable, or enableViews(view, true) to enable again.

use following attribute in your xml layout( as a example textView)
android:visibility="gone"
in button click event
myText.setVisible(myText.VISIBLE)
you can either use them one by one or you can put all invisible content in a single layout and hide the layout. then once you want to show them, just VISIBLE the layout. then all will display
need any more comment.. just comment.

Android: How to propagate click event to LinearLayout childs and change their drawable

I would like to create a linear layout which would behave similarly to ImageButton.
<LinearLayout
android:id="#+id/container"
style="?WidgetHomeIconContainer">
<ImageView
android:id="#+id/icon"
style="?WidgetHomeIcon" />
<TextView
android:id="#+id/title"
style="?WidgetHomeLabel"
android:text="#string/title"
android:textAppearance="?attr/TextHomeLabel" />
</LinearLayout>
In styles of ImageView, TextView and LinearLayout, I set a selectors for all states.
Now:
when I click on ImageView (I tried it also with ImageButton) - it behaves correctly and the image is changed according the selector xml.
when I click on LinearLayout - the linear layout is clicked, but the the ImageView and TextView don't change it's drawable/appearance
So I would like to do the following. When I click on parent LinearLayout, I need to change all it's childs to pressed state.
I tried to add following code to LinearLayout onClickListener to propagate the click:
#Override
public void onClick(View v)
{
LinearLayout l = (LinearLayout) v;
for(int i = 0; i < l.getChildCount(); i++)
{
l.getChildAt(i).setClickable(true);
l.getChildAt(i).performClick();
}
}
But it still reamins the same. Thank you very much for any help.

Put
android:duplicateParentState="true"
in your ImageView and TextView..then the views get its drawable state (focused, pressed, etc.) from its direct parent rather than from itself.

Not only make for every child:
android:duplicateParentState="true"
But also additionally:
android:clickable="false"
This will prevent unexpected behaviour (or solution simply not working) if clickable child views are used.
SO Source

After having the same problem some months later, I found this solution:
private void setOnClickListeners() {
super.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
onClick(v);
}
});
for (int index = 0; index < super.getChildCount(); index++) {
View view = super.getChildAt(index);
view.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
onClick(v);
}
});
}
}
protected void onClick(View v) {
// something to do here...
}

In my case, no one of the other solutions works!
I finally had to use OnTouchListener as explained here, capturing the event when the user clicks in the parent view, and removing all childs OnClickListener.
So the idea is, delegate the click behavior to the parent, and notify the child that is really clicked, if you want to propagate the event. ¡¡That's what we are looking for!!
Then, we need to check which child has been clicked. You can find a reference here to know how it´s done. But the idea is basiclly getting the area of the child, and asking for who contains the clicked coordinates, to perform his action (or not).

At first, my child view failed to get click from parent. After investigating, what I need to do to make it work are:
remove click listener on child view
adding click listener on parent view
So, I don't need to add these on every children.
android:duplicateParentState="true"
android:clickable="false"
I only add duplicateParentState to one of my child view.
My child view is now listening to parent click event.

How to remove focus without setting focus to another control?

I like my UIs to be intuitive; each screen should naturally and unobtrusively guide the user on to the next step in the app. Barring that, I strive to make things as confusing and confounding as possible.
Just kidding :-)
I've got three TableRows, each containing a read-only and non-focusable EditText control and then a button to its right. Each button starts the same activity but with a different argument. The user makes a selection there and the sub-activity finishes, populating the appropriate EditText with the user's selection.
It's the classic cascading values mechanism; each selection narrows the available options for the next selection, etc. Thus I'm disabling both controls on each of the next rows until the EditText on the current row contains a value.
I need to do one of two things, in this order of preference:
When a button is clicked, immediately remove focus without setting focus to a different button
Set focus to the first button when the activity starts
The problem manifests after the sub-activity returns; the button that was clicked retains focus.
Re: #1 above - There doesn't appear to be a removeFocus() method, or something similar
Re: #2 above - I can use requestFocus() to set focus to the button on the next row, and that works after the sub-activity returns, but for some reason it doesn't work in the parent activity's onCreate().
I need UI consistency in either direction--either no buttons have focus after the sub-activity finishes or each button receives focus depending on its place in the logic flow, including the very first (and only) active button prior to any selection.

Using clearFocus() didn't seem to be working for me either as you found (saw in comments to another answer), but what worked for me in the end was adding:
<LinearLayout
android:id="#+id/my_layout"
android:focusable="true"
android:focusableInTouchMode="true" ...>
to my very top level Layout View (a linear layout). To remove focus from all Buttons/EditTexts etc, you can then just do
LinearLayout myLayout = (LinearLayout) activity.findViewById(R.id.my_layout);
myLayout.requestFocus();
Requesting focus did nothing unless I set the view to be focusable.

Old question, but I came across it when I had a similar issue and thought I'd share what I ended up doing.
The view that gained focus was different each time so I used the very generic:
View current = getCurrentFocus();
if (current != null) current.clearFocus();

You can use View.clearFocus().
Use View.requestFocus() called from onResume().

android:descendantFocusability="beforeDescendants"
using the following in the activity with some layout options below seemed to work as desired.
getWindow().getDecorView().findViewById(android.R.id.content).clearFocus();
in connection with the following parameters on the root view.
<?xml
android:focusable="true"
android:focusableInTouchMode="true"
android:descendantFocusability="beforeDescendants" />
https://developer.android.com/reference/android/view/ViewGroup#attr_android:descendantFocusability
Answer thanks to:
https://forums.xamarin.com/discussion/1856/how-to-disable-auto-focus-on-edit-text
About windowSoftInputMode
There's yet another point of contention to be aware of. By default,
Android will automatically assign initial focus to the first EditText
or focusable control in your Activity. It naturally follows that the
InputMethod (typically the soft keyboard) will respond to the focus
event by showing itself. The windowSoftInputMode attribute in
AndroidManifest.xml, when set to stateAlwaysHidden, instructs the
keyboard to ignore this automatically-assigned initial focus.
<activity
android:name=".MyActivity"
android:windowSoftInputMode="stateAlwaysHidden"/>
great reference

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/ll_root_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
LinearLayout llRootView = findViewBindId(R.id.ll_root_view);
llRootView.clearFocus();
I use this when already finished update profile info and remove all focus from EditText in my layout
====> Update: In parent layout content my EditText add line:
android:focusableInTouchMode="true"

What about just adding android:windowSoftInputMode="stateHidden" on your activity in the manifest.
Taken from a smart man commenting on this: https://stackoverflow.com/a/2059394/956975

I tried to disable and enable focusability for view and it worked for me (focus was reset):
focusedView.setFocusable(false);
focusedView.setFocusableInTouchMode(false);
focusedView.setFocusable(true);
focusedView.setFocusableInTouchMode(true);

First of all, it will 100% work........
Create onResume() method.
Inside this onResume() find the view which is focusing again and again by findViewById().
Inside this onResume() set requestFocus() to this view.
Inside this onResume() set clearFocus to this view.
Go in xml of same layout and find that top view which you want to be focused and set focusable true and focusableInTuch true.
Inside this onResume() find the above top view by findViewById
Inside this onResume() set requestFocus() to this view at the last.
And now enjoy......

android:focusableInTouchMode="true"
android:focusable="true"
android:clickable="true"
Add them to your ViewGroup that includes your EditTextView.
It works properly to my Constraint Layout. Hope this help

You could try turning off the main Activity's ability to save its state (thus making it forget what control had text and what had focus). You will need to have some other way of remembering what your EditText's have and repopulating them onResume(). Launch your sub-Activities with startActivityForResult() and create an onActivityResult() handler in your main Activity that will update the EditText's correctly. This way you can set the proper button you want focused onResume() at the same time you repopulate the EditText's by using a myButton.post(new Runnable(){ run() { myButton.requestFocus(); } });
The View.post() method is useful for setting focus initially because that runnable will be executed after the window is created and things settle down, allowing the focus mechanism to function properly by that time. Trying to set focus during onCreate/Start/Resume() usually has issues, I've found.
Please note this is pseudo-code and non-tested, but it's a possible direction you could try.

You do not need to clear focus, just add this code where you want to focus
time_statusTV.setFocusable(true);
time_statusTV.requestFocus();
InputMethodManager imm = (InputMethodManager)this.getSystemService(Service.INPUT_METHOD_SERVICE);
imm.showSoftInput( time_statusTV, 0);

Try the following (calling clearAllEditTextFocuses();)
private final boolean clearAllEditTextFocuses() {
View v = getCurrentFocus();
if(v instanceof EditText) {
final FocusedEditTextItems list = new FocusedEditTextItems();
list.addAndClearFocus((EditText) v);
//Focus von allen EditTexten entfernen
boolean repeat = true;
do {
v = getCurrentFocus();
if(v instanceof EditText) {
if(list.containsView(v))
repeat = false;
else list.addAndClearFocus((EditText) v);
} else repeat = false;
} while(repeat);
final boolean result = !(v instanceof EditText);
//Focus wieder setzen
list.reset();
return result;
} else return false;
}
private final static class FocusedEditTextItem {
private final boolean focusable;
private final boolean focusableInTouchMode;
#NonNull
private final EditText editText;
private FocusedEditTextItem(final #NonNull EditText v) {
editText = v;
focusable = v.isFocusable();
focusableInTouchMode = v.isFocusableInTouchMode();
}
private final void clearFocus() {
if(focusable)
editText.setFocusable(false);
if(focusableInTouchMode)
editText.setFocusableInTouchMode(false);
editText.clearFocus();
}
private final void reset() {
if(focusable)
editText.setFocusable(true);
if(focusableInTouchMode)
editText.setFocusableInTouchMode(true);
}
}
private final static class FocusedEditTextItems extends ArrayList<FocusedEditTextItem> {
private final void addAndClearFocus(final #NonNull EditText v) {
final FocusedEditTextItem item = new FocusedEditTextItem(v);
add(item);
item.clearFocus();
}
private final boolean containsView(final #NonNull View v) {
boolean result = false;
for(FocusedEditTextItem item: this) {
if(item.editText == v) {
result = true;
break;
}
}
return result;
}
private final void reset() {
for(FocusedEditTextItem item: this)
item.reset();
}
}