Develop Reference

Edittext not display for emoji keyboard

EditText not seen when a keyboard is open. I have changed in
android:windowSoftInputMode=adjustPan manifest file and remove static keyboard height.
The keyboard does not update height as per the different size of devices (especially Samsung device)
I have also tried to get keyboard height and set emoji_keyboard layout and I followed this demo https://github.com/edsilfer/emoji-keyboard
Assing emoji-keyboard layout height dynamically
mRootWindow = getWindow();
mRootView = mRootWindow.getDecorView().findViewById(android.R.id.content);
mRootView.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout(){
Rect r = new Rect();
View view = mRootWindow.getDecorView();
view.getWindowVisibleDisplayFrame(r);
// r.left, r.top, r.right, r.bottom
}
});

Android How To hide/show some view when keyboard show/hide?

just like the picture, when the keyboard is show ,it hide the logo.
the question is how to listen the keyboard show/hide even? have some sample?

add this attribute to your activity in manifest
android:windowSoftInputMode="adjustResize"

Get a reference to the layout which you want to hide when keyboard pops up. You can set the visibility of that to GONE when keyboard is shown and to VISIBLE otherwise. So your task now is to detect whether the keyboard is shown or hidden. For that you can use ViewTreeObserver.OnGlobalLayoutListener().
rootView = getWindow().getDecorView().getRootView();
rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
Rect rect = new Rect();
rootView.getWindowVisibleDisplayFrame(rect);
int screenHeight = rootView.getHeight();
int keyboardHeight = screenHeight - (rect.bottom - rect.top);
if(keyboardHeight > screenHeight / 3){
//hide the layout
}
else{
//show the layout
}
}
});

How do you set the height of a view programmatically?

I have 2 views - a container view, and a gauge view. I want to programmatically change the height of the gauge view. The problem is that when I get the height of the container view - it always comes back as 2.0 - even though the height is full-screen!
int fullHeight = containerView.getLayoutParams().height;
Number height = fullHeight * (thisTank.getTankTotalVolume().doubleValue()/thisTank.getTankMaxVolume().doubleValue());
Number width = gaugeView.getWidth();
//gaugeView.setLayoutParams(new LinearLayout.LayoutParams(width.intValue(), height.intValue()));
gaugeView.getLayoutParams().height = height.intValue() * fullHeight;
gaugeView.requestLayout();

Actually, if you set the view's height to WRAP_CONTENT or MATCH_PARENT in XML, the containerView.getLayoutParams().height should be equals to 2, its a default value...!
You have to two options,
First, you can defined a fix value in the XML file
Second, and recommended, you can use a tree observer for this purpose. Please see the below code...!
final View layout = (View)findViewById(R.id.YOUR_VIEW_ID);
ViewTreeObserver vto = layout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
this.layout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
int width = layout.getMeasuredWidth();
int height = layout.getMeasuredHeight();
}
});

Dynamically getting Height and Width of Layout

In my app I'm adding many views inside the Layout having below properties how shall i get the correct height of the layout at run time
LinearLayout ll = new LinearLayout(this);
ll.setLayoutParams(new LayoutParams(840,LayoutParams.WRAP_CONTENT));
ll.setOrientation(LinearLayout.VERTICAL);
ll.addView(view1);
ll.addView(view2);
ll.getHeight();
how to get Height of layout at that point consider adding of view1 and view2 , irrespective of my property(LayoutParams.WRAP_CONTENT), beacause it always return 0 to me?

Try this way,hope this will help you to solve your problem.
int width;
int height;
ll.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
width = view.getMeasuredWidth();
height = view.getMeasuredHeight();
}
});

You can call
ll.post(new Runnable()
{
public void run()
{
ll.getHeight();
}
});
This will give you ll's height after adding the child views.

Programmatically add items to scrollview top, but should not scroll to top

I have scrollview with child LinearLayout . I am adding data programmaticaly to it. When i add some data to top of linearlayout it automatically scrolls to top element. But i want something like , user reaches top -> scrolls upside to load previous data ->add data to linearlayout top but should not get focus, after addition complete , if user scrolls then and then only it should display .
How to achieve this?

Well I thought of a way and it works almost perfectly.
I have a LinearLayout (llCommunicationsLayout) inside a ScrollView (svCommunications) .
I inflate a new LinearLayout, I'm going to add views to the top of this new LinearLayout and then add this new layout to the LinearLayout inside the ScrollView.
This is the new layout:
final LinearLayout wrapperLayout = (LinearLayout) mInflater.inflate(R.layout.empty_layout, null);
I add my views to the 0'th position of this layout.
wrapperLayout.addView(view, 0);
After all the views are added into the wrapperLayout, I add the wrapperLayout into the llCommunicationsLayout (the one inside my ScrollView)
llCommunicationsLayout.addView(wrapperLayout, 0);
After this, I calculate their heights after the wrapperLayout is on screen (has a measurable height)
wrapperLayout.post(new Runnable() {
#Override
public void run() {
int wrapperHeight = wrapperLayout.getHeight();
int svHeight = svCommunications.getHeight();
int scrollHeight = Math.abs(svHeight - wrapperHeight);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int displayHeight = displaymetrics.heightPixels / 4;
svCommunications.scrollTo(0, (scrollHeight + displayHeight));
}
});
Here, I get both the newly added layout's and the ScrollView's heights.
I calculate their difference, add the 1/4 of the height of the screen of my device and scroll it, voila!
It's not perfect, but after the layouts are added, it no longer scrolls to the top of the screen. Experiment with the displayHeight for different results.
Hope this helps someone out.

You can grab the current view which is on top of your LinearLayout then add new content to your LinearLayout and then scroll back to view which was previously on top. The code would be something like:
public void addViewsOnTop(List<View> views) {
final View currentViewOnTop = (linearLayout.getChildCount() > 0) ? linearLayout.getChildAt(0) : null;
// Add Views. Note that views will appear in reverse order
for(View view : views) {
linearLayout.addView(view, 0);
}
// Scroll back to view which was on top
if(currentViewOnTop != null) {
new Handler().post(new Runnable() {
#Override
public void run() {
scrollView.scrollTo(0, currentViewOnTop.getBottom());
}
});
}
}

Solved....
Try this, worked for me ,
lv_chat.setAdapter(adapter);
lv_chat.setSelection(somePreviousPosition);