How to push recyclerView up when keyboard appear?

Question

I want to build a message layout like WhatsApp. I have an EditText and a RecyclerView.

The problem is when the keyboard appears, it hide the messages at the bottom of the list.

So let's say this the RecyclerView:

---item 1---  
---item 2---  
---item 3---  
---item 4---  
---EditText---

when the the keyboard appears, I get this:

---item 1---  
---item 2---  
---EditText---
---Keyboard---  

but I want to get this:

---item 3---  
---item 4---  
---EditText---
---Keyboard---

NOTE: when I set linearLayoutManager.setStackFromEnd(true); it works but when there is one message it appears at the bottom of the page.

Answer 1

set adjustresize for the activity with recyclerview and editText :

android:windowSoftInputMode="adjustResize"

add onLayoutChangeListener to your RecyclerView and set scrollToPosition to data.size() -1 in onLayoutChange:

  mRecyclerView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
 @Override

public void onLayoutChange(View v, int left, int top, int right,int bottom, int oldLeft, int oldTop,int oldRight, int oldBottom)
{

mRecyclerView.scrollToPosition(mMessages.size()-1);

}
    });

Answer 2

The way I did it, is to set setStackFromEnd() according the size of the item holder, and set adjustResize in androidManifest.

This is how I check:

if (recycleView.getChildCount() == items.size()){
    mLayoutManager.setStackFromEnd(true);
}
else{
    mLayoutManager.setStackFromEnd(false);
}

Answer 3

I am not good at English. Use ChatRecyclerView and set the stackfromend of the linearlayoutmanager to false.

public class ChatRecyclerView extends RecyclerView {
    private int oldHeight;

    public ChatRecyclerView(Context context) {
        super(context);
    }

    public ChatRecyclerView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ChatRecyclerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        int delta = b - t - this.oldHeight;
        this.oldHeight = b - t;
        if (delta < 0) {
            this.scrollBy(0, -delta);
        }
    }
}