BaseFullscreenFragment.java

package com.loopeer.codereader.ui.fragment;

import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.view.View;

public class BaseFullscreenFragment extends BaseFragment {

    private static final boolean AUTO_HIDE = true;

    private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
    private static final int UI_ANIMATION_DELAY = 300;

    private View mDecorView;

    private final Handler mHideHandler = new Handler();

    private final Runnable mHideRunnable = new Runnable() {
        @Override
        public void run() {
            mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        }
    };

    private boolean mVisible;

    protected final View.OnTouchListener mDelayHideTouchListener = (view, motionEvent) -> {
        if (AUTO_HIDE) {
            delayedHide(AUTO_HIDE_DELAY_MILLIS);
        }
        return false;
    };

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mDecorView = getActivity().getWindow().getDecorView();
        mVisible = true;
    }

    private void toggle() {
        if (mVisible) {
            hide();
        } else {
            show();
        }
    }

    protected void hide() {
        mVisible = false;
        mHideHandler.postDelayed(mHideRunnable, UI_ANIMATION_DELAY);
    }

    protected void show() {
        mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
        mVisible = true;

        mHideHandler.removeCallbacks(mHideRunnable);
    }

    protected void delayedHide(int delayMillis) {
        mHideHandler.removeCallbacks(mHideRunnable);
        mHideHandler.postDelayed(mHideRunnable, delayMillis);
    }

}