Android: show/hide status bar/power bar

Do you have the fullscreen theme set in the manifest?

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

I don't think you'll be able to go fullscreen without this.

I would use the following to add and remove the fullscreen flag:

// Hide status bargetWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);// Show status bargetWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

For Some People, Showing status bar by clearing FLAG_FULLSCREEN may not work,

Here is the solution that worked for me, (Documentation) (Flag Reference)

Hide Status Bar

// Hide Status Barif (Build.VERSION.SDK_INT < 16) {            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                    WindowManager.LayoutParams.FLAG_FULLSCREEN);}else {   View decorView = getWindow().getDecorView();  // Hide Status Bar.   int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;   decorView.setSystemUiVisibility(uiOptions);}

Show Status Bar

   if (Build.VERSION.SDK_INT < 16) {              getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);    }    else {       View decorView = getWindow().getDecorView();      // Show Status Bar.       int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE;       decorView.setSystemUiVisibility(uiOptions);    }

used for kolin in androidfor hide status bar in kolin no need to used semicolon(;) at the end of the line

window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)

in android using java language for hid status bar

getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);