Develop Reference

Android AutoCompleteTextView width

I am following this guide to create a dropdown menu:
https://material.io/components/menus/android#exposed-dropdown-menus
So I have a TextInputLayout containing a custom subclass of MaterialAutoCompleteTextView.
I override convertSelectionToString to show a shorter version of the selected item:
#Override
protected CharSequence convertSelectionToString(Object selectedItem) {
if (selectedItem instanceof CountryInfo) {
CountryInfo country = (CountryInfo) selectedItem;
return country.toShortString();
}
return super.convertSelectionToString(selectedItem);
}
You can see below what it looks like. However what I want is for the upper text input box to wrap only the shortened text, while the dropdown expands wide enough to show its contents.
What I have
What I want (mock)

You need to compute the width of the view based on the selection of the item in it.
I guess your custom view has some method like setText, right?
And after that you can set the width to wrap content of the currently selected view. So something like this:
CharSequence selectedText = convertSelectionToString(selectedObject);
yourView.setText(selectedText);
// ConstraintLayout is mentioned here, but it can be any layout
yourView.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
yourView.invalidate(); // might be needed to use

I need to make a box in andengine

protected void texto() {
activity.runOnUiThread(new Runnable() {
public void run() {
final EditText input = new EditText(activity);
String value = input.getText().toString().trim();
input.setInputType(InputType.TYPE_CLASS_TEXT);
}
});
}
Doesn´t show me the text box on the scene maybe someone knows I'm doing wrong.

You need to at it to your View. Right now you are instantiating an EditText view but is not added to the layout View (LinearLayout, RelativeLayout, etc.) that your screen is rendering, thus making it not appearing.
To solve it, first you need to get your View using activity.findViewById, then you add the EditText view as a subview to it.
Adjust the position if needed.

Keyboard placement obscures view below EditText would like to keep visible

I have an activity that is basically a long form of entry fields.
On each row, I want to show a TextView to serve as hint text just below each EditText and I want the TextView to remain visible at all times when the user is entering data. Unfortunately, the soft keyboard obscures the hint text and always positions itself immediately below the EditText. Is there any technique that will allow the TextView below the EditText to also be visible when the soft keyboard appears and the contents are adjusted (via windowSoftInputMode=adjustResize|adjustPan), without having the user scroll ?

Vishavjeet got me on the right track in suggesting I scrolldown to reveal the view that may be overlapped by the keyboard. Below is a function similar to what I used to solve the problem. It can be called when the EditText above the TextView receives focus:
// View targetView; // View that may be hidden by keyboard
// ScrollView scrollContainerView; // Scrollview containing hiddenView
//
void assureViewVisible (View targetView, ScrollView, scrollContainerView) {
Window rootWindow = activity.getWindow();
Rect rMyView = new Rect();
View rootview = rootWindow.getDecorView();
rootview.getWindowVisibleDisplayFrame(rMyView); // Area not taken up by keyboard
int subTextPos[] = new int[2];
targetView.getLocationInWindow(subTextPos); // Get position of targetView
int subTextHt = targetView.getHeight(); // Get bottom of target view
if ((subTextPos[1]+subTextHt) > rMyView.bottom) { // Is targetView at all obscured?
int scrollBy = (subTextPos[1]+subTextHt) - rMyView.bottom + 10; // add a small bottom margin
mMeasurementViewScrollView.smoothScrollBy(0, scrollBy); // Scroll to subtext
}
}

EDIT:
By understanding the problem more deeply, I think that you should add scroll programatically when user clicks on the Edittext. Here is the code to do that:
private final void focusOnView()
{
new Handler().post(new Runnable()
{
#Override
public void run()
{
your_scrollview.scrollTo(0, your_EditBox.getBottom());
}});
}
From my personal experience I think there is not such way to do that. The thing you can do is place the hint textview toRightOf the editext. Or Use modern Approach by using a Hint Placeholder on Edittext:
In XML, it's simply android:hint="someText"
Programatically you can use edittext.setHint(int);
pass R.string.somestring in above method.

Change textsize of textview with button

I want to implement a feature that allows user to change the textSize of a textView in another view inside the app,
So I have a button with its ＂onClick" property set to:
Class mainActivity
public void increaseFont(View view)
{
MainViewPager.changeTextViewTextSize(mTextSize);
}
Class MainViewPager
static public void changeTextViewTextSize(int aTextSize)
{
View detailView = (View) LayoutInflater.from(mContext).inflate(R.layout.details, null);
TextView description = (TextView) detailView.findViewById(R.id.story_description);
description.setTextSize(aTextSize);
}
QUESTIONS is the textSize can't be changed when clicking the button. So how to?

The text size can changed at run time of course. You issue is related to the method changeTextViewTextSize. Using the inflater you are creating a new instance of R.layout.details, and through it, you are looking for the TextView you want to change the text size. But that layout is not at screen. It is not what you are seeing.

changing visibility of text android

Hi i have two textViews that i initially set its visibility to gone then animate in and become visible. now i want to make the invisible again but for some reason they're still showing on screen does anyone no why?
in my onCreate() i make the view gone
register = (TextView)findViewById(R.id.register);
register.setVisibility(View.GONE);
forgotpassword = (TextView)findViewById(R.id.forgotpw);
forgotpassword.setVisibility(View.GONE);
then later on i make it visible
public void run()
{
animations();
loginForm.setVisibility(View.VISIBLE);
register.setVisibility(View.VISIBLE);
forgotpassword.setVisibility(View.VISIBLE);
}
and then when a user presses a button i want the text views to become invisible so that they retain their layout but they stay visible on screen
signInBtn = (Button) findViewById(R.id.signin);
signInBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
signInProcess();
}
});
public void signInProcess() {
register.setVisibility(View.INVISIBLE);
forgotpassword.setVisibility(View.INVISIBLE);
setuploader.setVisibility(View.VISIBLE);
}

In Android when you animate something, It's just drawn somewhere else. The actual element is not moved. So when you animate signInBtn it's drawn somewhere else, but the actual button is not moved from the original position. So when you click the button the click handler is not called.
To avoid this set fillAfter = True in your animation so the button will actually get moved at the end of your animation.
Also, after animating a view in Android make sure you call View.clearAnimation() before trying to change its visibility.