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  • Restricting a View to parentbottom when keyboard appears.

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    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 :)

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