I have a RelativeLayout with an EditText that has a Button below it. Ideally as the user clicks the EditText and fills in multiple lines of text, the RelativeLayout would also expand as the lines increase. However, the behavior I have now is that after the first line of the EditText is filled, the keyboard begins to cover the Button below it and after 3-4 lines of text in the EditText, the Button is gone below the keyboard. Is there any way to have it so that as I type in text, the entire layout increases in size so that the button stays above the keyboard? Here is my code:
AndroidManifest.xml:
    <activity
        android:name="<Name of project>.activity.Comments"
        android:configChanges="orientation|keyboardHidden"
        android:label="Comments"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.NoActionBar"
        android:windowSoftInputMode="stateHidden|adjustResize" />
Comments.xml:
<RelativeLayout
        android:id="@+id/send_message"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:layout_margin="4dp"
        android:layout_alignParentBottom="true">
        <EditText
            android:fontFamily="sans-serif"
            android:id="@+id/write_comment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="12dp"
            android:gravity="left"
            android:textSize="16sp"
            android:textColor="@color/black"
            android:cursorVisible="false"
            android:textColorHint="@color/material_color_grey_300"
            android:hint="@string/commentBack"
            android:background="@drawable/edittext_bg"
            android:inputType="textMultiLine"
            android:isScrollContainer="true"
            android:maxLength="200"
            android:scrollHorizontally="false" />
        <Button
            android:fontFamily="sans-serif-medium"
            android:id="@+id/send_comment"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="16sp"
            android:textColor="@color/colorPrimary"
            android:layout_marginTop="8dp"
            android:text="@string/send"
            android:background="@null"
            android:layout_below="@id/write_comment"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:textAllCaps="false" />
    </RelativeLayout>
I've tried to add android:isScrollContainer="true" thinking that it would create a scroll container to the EditText so that it would help expand the layout but that didn't seem to work. Any help would be appreciated. Thanks!
Edit: Added in entire layout based on answer below:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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" android:fitsSystemWindows="true"
    android:id="@+id/comments_layout">
    <android.support.design.widget.AppBarLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/comments_appbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
    </android.support.design.widget.AppBarLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <RelativeLayout
            android:layout_alignParentTop="true"
            android:layout_marginTop="?attr/actionBarSize"
            android:layout_width="match_parent"
            android:id="@+id/comments_listview"
            android:layout_height="match_parent">
            <ListView
                android:scrollbars="vertical"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/rv_view_comments">
            </ListView>
            <TextView
                android:layout_below="@id/rv_view_comments"
                android:gravity="center_horizontal"
                android:padding="16dp"
                android:textSize="16sp"
                android:id="@+id/empty_list_item"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:visibility="gone"
                android:text="@string/noComments" >
            </TextView>
            <include layout="@layout/include_progress_overlay"/>
        </RelativeLayout>
        <RelativeLayout
    android:id="@+id/send_message"
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:layout_margin="4dp"
    android:layout_alignParentBottom="true">
    <EditText
        android:fontFamily="sans-serif"
        android:id="@+id/write_comment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="12dp"
        android:gravity="left"
        android:textSize="16sp"
        android:textColor="@color/black"
        android:cursorVisible="false"
        android:textColorHint="@color/material_color_grey_300"
        android:hint="@string/commentBack"
        android:background="@drawable/edittext_bg"
        android:inputType="textMultiLine"
        android:isScrollContainer="true"
        android:maxLength="200"
        android:scrollHorizontally="false" />
    <Button
        android:fontFamily="sans-serif-medium"
        android:id="@+id/send_comment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textColor="@color/colorPrimary"
        android:layout_marginTop="8dp"
        android:text="@string/send"
        android:background="@null"
        android:layout_below="@id/write_comment"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:textAllCaps="false" />
</RelativeLayout>
    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
Edit: As per Jaydroider's request, I have included a photo to show my problem. If I could make a GIF or something, if I add more text to my EditText field, the Send button will disappear under the keyboard and unless I remove text from the EditText, the `Send cannot be pushed:
Edit: I have also shown how I scroll to the bottom of my ListView when I click on the EditText here if this helps.
public void setupComment(final EditText comment) {
        //Once we send the post, we want to scroll to bottom of listview
        comment.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId,
                                          KeyEvent event) {
                if (event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)) {
                    comment.setImeOptions(EditorInfo.IME_ACTION_DONE);
                    resetKeyboardSettings();
                }
                return false;
            }
        });
        //Hide the cursor until view is clicked on
        View.OnTouchListener onTouchListener = new View.OnTouchListener(){
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                System.out.println("Touched");
                if (v.getId() == comment.getId()) {
                    comment.setCursorVisible(true);
                }
                commentsView.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        commentsView.smoothScrollToPosition(commentsView.getAdapter().getCount());
                    }
                }, 750);
                return false;
            }
        };
        comment.setOnTouchListener(onTouchListener);
    }

 
    
 
     
     
     
    