Hello all readers. In this blog,I am going to tell you how to restrict a particular view (Relative or Linear) to be always at parent bottom of your activity even when the keyboards appears.

Lets us first look at the xml, activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ssss" />


    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tv">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <LinearLayout
                android:id="@+id/ll"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="1"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="2"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="3"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="4"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="5"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="6"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="7"
                    android:singleLine="true" />

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="20dp"
                    android:hint="8"
                    android:singleLine="true" />


            </LinearLayout>

            <View
                android:id="@+id/viewTemp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <RelativeLayout
                android:id="@+id/rlBottom"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_below="@+id/ll"
                android:background="@android:color/holo_blue_light">

                <Button
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="hit" />

            </RelativeLayout>
        </RelativeLayout>

    </ScrollView>
</RelativeLayout>

In this xml, i have used a Textview, 8 Edittext, a View and a Button.

Now the Java file, MainActivity.java

private RelativeLayout rlBottom;
private View viewTemp;
private int viewWidth, viewHeight, temp, screenHeight, screenWidth, scrollWidth, scrollHeight;

Copy the code in onCreate of your Activity,

 rlBottom = (RelativeLayout) findViewById(R.id.rlBottom);
        viewTemp = findViewById(R.id.viewTemp);
        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        screenHeight = displaymetrics.heightPixels;
        screenWidth = displaymetrics.widthPixels;

        Log.v("width is", screenWidth + "");
        Log.v("height is", screenHeight + "");

        ViewTreeObserver viewTreeObserver = rlBottom.getViewTreeObserver();

        if (viewTreeObserver.isAlive()) {
            viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    rlBottom.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                    viewWidth = rlBottom.getWidth();
                    viewHeight = rlBottom.getHeight();

                    Log.v("view width is", viewWidth + "");
                    Log.v("view height is", viewHeight + "");
                    temp = (screenHeight - (2 * viewHeight));
                    viewTemp.setMinimumHeight(temp);
                    Log.v("view height calculated", temp + "");
              
                }
            });
        }

Here i have calculated width and height of the android phone. After calculating that, width and height of Relative layout with id rlBottom is calculated using ViewTreeObserver. A View is set to minimum height which is calculated by 

temp = (screenHeight - (2 * viewHeight));

Build your project and Run,Relative layout will always be a parent bottom and doesn't come up when keyboard appears.

Note:In your manifest file,use windowSoftInputMode=adjustResize of your particular avtivity.

That's all. Hope it helps :)