How to make a tabbed activity go full screen in Android?

Question

I am trying to make a tabbed activity(with swipe pages) go full screen but its not working....I have tried the way I know to resolve the issue ie using,

 requestWindowFeature(Window.FEATURE_NO_TITLE);
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);

but this crashes my app.... Can anyone walk me through for this, please ? PS I have used fragments to make individual swipe pages.

Here is the Java file for the Activity

package com.example.neo.introv21;

import android.app.Activity;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    private SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //No title bar is set for the activity
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //Full screen is set for the Window
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);


        setContentView(R.layout.activity_main);

        //This is to hide the toolbar that resides on the top of the screen instead
        //of using the fullscreen activity
        //Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
       // setSupportActionBar(toolbar);
       // getSupportActionBar().hide();

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);


        /*FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });*/

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        //getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }





    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position){
                case 0:
                    page1 pg1_object = new page1();
                    return pg1_object;
                case 1:
                    page2 pg2_object = new page2();
                    return pg2_object;
                case 2:
                    page3 pg3_object = new page3();
                    return pg3_object;
                case 3:
                    page4 pg4_object = new page4();
                    return pg4_object;
                case 4:
                    page5 pg5_object = new page5();
                    return pg5_object;
                case 5:
                    page6 pg6_object = new page6();
                    return pg6_object;
                case 6:
                    page7 pg7_object = new page7();
                    return pg7_object;
                case 7:
                    page8 pg8_object = new page8();
                    return pg8_object;
                case 8:
                    page9 pg9_object = new page9();
                    return pg9_object;

                default:
                    return null;
            }
        }

        @Override
        public int getCount() {
            // Show 9 total pages.
            return 10;
        }
}

This is one of the java file that acts like a fragment to inflate the tabbed activity

public class page1 extends Fragment {
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.page1, container, false);
        return rootView;
    }
}

Supporting XML file for the fragment page

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.neo.introv21.MainActivity">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ss1"
        tools:ignore="ContentDescription" />

</android.support.constraint.ConstraintLayout>

Answer 1

To make any activity go full screen just follow this - 1. Add this theme to styles.xml

<style name="AppTheme.NoTitle" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="android:windowFullscreen">true</item>
        <item name="android:windowContentOverlay">@null</item>
</style>

2. Apply this theme to your activity in manifest

<activity android:name=".YourActivity"
          android:theme="@style/AppTheme.NoTitle"/>

3. Override onWindowsFocusChanged in your activity

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus)
            if (Build.VERSION.SDK_INT >= 19) {
                getWindow().getDecorView().setSystemUiVisibility(
                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                                | View.SYSTEM_UI_FLAG_FULLSCREEN
                                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
            } else {
                if (Build.VERSION.SDK_INT > 10) {
                    findViewById(android.R.id.content).setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
                    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
                }
            }

    }

PS - If you want action bar for your app do not set below in your theme.

<item name="android:windowNoTitle">true</item>
<item name="windowActionBar">false</item>