Android – Bloquear a expansão da barra de status programaticamente (prevent status bar expansion)

StatusBarUtils.java

import android.app.Activity;
import android.content.Context;
import android.graphics.PixelFormat;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.view.WindowManager;
 
/**
 * <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
 * Created by gbzarelli on 1/29/18.
 */
public class StatusBarUtils {
 
    public static void removeViewGroup(Activity activity, ViewGroup viewGroup) {
        WindowManager manager = (WindowManager) activity.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
        manager.removeView(viewGroup);
    }
 
    public static ViewGroup preventStatusBarExpansion(Activity activity) {
        return preventStatusBarExpansion(activity, new DefaultCustomView(activity));
    }
 
    public static ViewGroup preventStatusBarExpansion(Activity activity, ViewGroup viewGroup) {
        WindowManager manager = ((WindowManager) activity.getApplicationContext()
                .getSystemService(Context.WINDOW_SERVICE));
 
        WindowManager.LayoutParams localLayoutParams = new WindowManager.LayoutParams();
        localLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;
        localLayoutParams.gravity = Gravity.TOP;
        localLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
 
        localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
 
        int resId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");
        int result = 0;
        if (resId > 0) {
            result = activity.getResources().getDimensionPixelSize(resId);
        }
 
        localLayoutParams.height = result;
        localLayoutParams.format = PixelFormat.TRANSPARENT;
 
        if (viewGroup == null) {
            viewGroup = new DefaultCustomView(activity);
        }
        manager.addView(viewGroup, localLayoutParams);
        return viewGroup;
    }
 
    public static class DefaultCustomView extends ViewGroup {
        public DefaultCustomView(Context context) {
            super(context);
        }
        @Override
        protected void onLayout(boolean changed, int l, int t, int r, int b) {
        }
        @Override
        public boolean onInterceptTouchEvent(MotionEvent ev) {
            return true;
        }
    }
}

onde colocar este arquivo e como chamá-lo

@Tmsolutions você pode colocar em qualquer lugar (estrutura que desejar) no caso de onde chama-lo, quando implementei utilizei na minha Activity principal do projeto, sendo chamada pelo meu fragment. Ex:>

Activity:>

[...]
class HomeActivity : Activity() {

    companion object {
        @SuppressLint("StaticFieldLeak")
        private var customStatusBar: ViewGroup? = null

        fun resetStatusBar(activity: Activity) {
            if (customStatusBar != null) {
                StatusBarUtils.removeViewGroup(activity, customStatusBar)
                customStatusBar = null
            }
        }
    }
[...]

Chamada pelo Fragment associada a activity:

class GridActivity : FragmentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_grid)
        HomeActivity.resetStatusBar(this)
    }
}