SystemUIManage.gif

Dimming the System Bars (沉浸模式)

知乎 和 Medium 中都使用到了这个效果，作为沉浸式阅读模式。

// This example uses decor view, but you can use any visible view.

View decorView = getWindow().getDecorView();

int uiOptions = View.SYSTEM_UI_FLAG_LOW_PROFILE;

decorView.setSystemUiVisibility(uiOptions);

Reveal the Status and Navigation Bars (全屏模式)

public void toggleHideyBar() {

// BEGIN_INCLUDE (get_current_ui_flags)

// The UI options currently enabled are represented by a bitfield.

// getSystemUiVisibility() gives us that bitfield.

int uiOptions = getWindow().getDecorView().getSystemUiVisibility();

int newUiOptions = uiOptions;

// END_INCLUDE (get_current_ui_flags)

// BEGIN_INCLUDE (toggle_ui_flags)

boolean isImmersiveModeEnabled =

((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);

if (isImmersiveModeEnabled) {

Log.i("SystemUI", "Turning immersive mode mode off. ");

} else {

Log.i("SystemUI", "Turning immersive mode mode on.");

}

// Navigation bar hiding: Backwards compatible to ICS.

if (Build.VERSION.SDK_INT >= 14) {

newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;

}

// Status bar hiding: Backwards compatible to Jellybean

if (Build.VERSION.SDK_INT >= 16) {

newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;

}

// Immersive mode: Backward compatible to KitKat.

// Note that this flag doesn't do anything by itself, it only augments the behavior

// of HIDE_NAVIGATION and FLAG_FULLSCREEN. For the purposes of this sample

// all three flags are being toggled together.

// Note that there are two immersive mode UI flags, one of which is referred to as "sticky".

// Sticky immersive mode differs in that it makes the navigation and status bars

// semi-transparent, and the UI flag does not get cleared when the user interacts with

// the screen.

if (Build.VERSION.SDK_INT >= 18) {

newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

}

getWindow().getDecorView().setSystemUiVisibility(newUiOptions);

//END_INCLUDE (set_ui_flags)

}