Always disable status bar and bottom bar in a custom launcher

Question

I need to write custom android launcher with only one my application and with disabling android system statusbar and bottom bar. Here is my code

in AndroidManifest.xml

    <activity android:name=".MainActivity"
        android:launchMode="singleTask"
        android:stateNotNeeded="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER"/>
            <category android:name="android.intent.category.HOME" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

in styles.xml

 <item name="android:windowShowWallpaper">true</item>
 <item name="android:windowBackground">@android:color/transparent</item>

ins MainActivity.class

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        hideSystemUi()
        buttonStartMyApp.setOnClickListener {
            Toast.makeText(this@MainActivity, "Start own app", Toast.LENGTH_SHORT).show()
        }
    }

private fun hideSystemUi() {
        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_FULLSCREEN
                or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)
        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
    }

This launcher starts with only one button (its okay) and without status bar and bottom nav bar. BUT we can to get them with top-down swipe on the top of the screen. How to disable this function? Thanks.

Answer 1

You have implemented the IMMERSIVE_STICKY flag which allows the status bar to be called by top-down swipe on the top of the screen. To disable this:

super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY);
setContentView(R.layout.your_layout);

To disable status drop down, use this method. This is an overlay over status bar and consumed all input events. It prevents the status from expanding.

Note:

customViewGroup is custom class which extends any layout(frame,relative layout etc) and consumes touch event. To consume touch event override the onInterceptTouchEvent method of the view group and return true.

Android Manifest

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/> 

customViewGroup implementation

WindowManager manager = ((WindowManager) 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|

            // this is to enable the notification to recieve touch events
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |

            // Draws over status bar
            WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

    localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
    localLayoutParams.height = (int) (50 * getResources()
            .getDisplayMetrics().scaledDensity);
    localLayoutParams.format = PixelFormat.TRANSPARENT;

    customViewGroup view = new customViewGroup(this);

    manager.addView(view, localLayoutParams);