一、作用

    去除标题栏和底部导航栏

二、使用

    在onCreate()中setContentView加载layout之前使用

NavigationBarUtil.hideNavigationBar(getWindow());

三、注意

    1.使用dialog等会使得底部导航栏再次出现，以下是解决办法

//失能焦点
NavigationBarUtil.focusNotAle(dialog.getWindow());
dialog.show();
//显示虚拟栏的时候 隐藏
NavigationBarUtil.hideNavigationBar(dialog.getWindow());
//再清理失能焦点
NavigationBarUtil.clearFocusNotAle(dialog.getWindow());

四、代码

import android.os.Build;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
/**
 * author : GodH
 * date   : 2019/8/22 15:39
 * desc   ：控制虚拟栏
 * version: 1.0
 */
public class NavigationBarUtil {
    /**
     * 隐藏虚拟栏 ，显示的时候再隐藏掉
     *
     * @param window
     */
    static public void hideNavigationBar(final Window window) {
        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        window.getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                        //布局位于状态栏下方
                        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                        //全屏
                        View.SYSTEM_UI_FLAG_FULLSCREEN |
                        //隐藏导航栏
                        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                        View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                        View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
                if (Build.VERSION.SDK_INT >= 19) {
                    uiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
                } else {
                    uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
                }
                window.getDecorView().setSystemUiVisibility(uiOptions);
            }
        });
    }
    static public void showNavigationBar(final Window window) {
        if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = window.getDecorView();
            v.setSystemUiVisibility(View.VISIBLE);
        } else if (Build.VERSION.SDK_INT >= 19) {
            View decorView = window.getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE|
                    View.SYSTEM_UI_FLAG_IMMERSIVE;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }
    /**
     * dialog 需要全屏的时候用，和clearFocusNotAle() 成对出现
     * 在show 前调用  focusNotAle   show后调用clearFocusNotAle
     *
     * @param window
     */
    static public void focusNotAle(Window window) {
        window.setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    }
    /**
     * dialog 需要全屏的时候用，focusNotAle() 成对出现
     * 在show 前调用  focusNotAle   show后调用clearFocusNotAle
     *
     * @param window
     */
    static public void clearFocusNotAle(Window window) {
        window.clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    }
}