Talk is cheap, show me the code.

--Linus Torvalds

Okay, here:

一、導航欄：

1. private void hideNavigationBar() {
2. View decorView = getWindow().getDecorView();
3. int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
4. | View.SYSTEM_UI_FLAG_FULLSCREEN;
5. decorView.setSystemUiVisibility(uiOptions);
6. }
8. private void showNavigationBar() {
9. View decorView = getWindow().getDecorView();
10. int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE;
11. decorView.setSystemUiVisibility(uiOptions);
12. }

相關：

SYSTEM_UI_FLAG_VISIBLE——顯示狀態欄和導航欄

SYSTEM_UI_FLAG_LOW_PROFILE——此模式下，狀態欄的圖標可能是暗的

SYSTEM_UI_FLAG_HIDE_NAVIGATION——隱藏導航欄

SYSTEM_UI_FLAG_FULLSCREEN——全屏，隱藏狀態欄和導航欄

SYSTEM_UI_FLAG_LAYOUT_STABLE

SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN——全屏，隱藏導航欄，狀態欄浮在布局上。

SYSTEM_UI_FLAG_IMMERSIVE——沈浸式：半透明的狀態欄和導航欄

SYSTEM_UI_FLAG_IMMERSIVE_STICKY——粘性沈浸式

二、狀態欄：

1. private void setStatusBarVisible(boolean
   show) {
2. if (show) {
3. int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
4. uiFlags |= 0x00001000;
5. getWindow().getDecorView().setSystemUiVisibility(uiFlags);
6. } else {
7. int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
8. | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
9. | View.SYSTEM_UI_FLAG_FULLSCREEN;
10. uiFlags |= 0x00001000;
11. getWindow().getDecorView().setSystemUiVisibility(uiFlags);
12. }
13. }

1. private void setSystemUIVisible(boolean show) {
2. if (show) {
3. int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
4. uiFlags |= 0x00001000;
5. getWindow().getDecorView().setSystemUiVisibility(uiFlags);
6. } else {
7. int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
8. | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
9. | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
10. | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
11. | View.SYSTEM_UI_FLAG_FULLSCREEN;
12. uiFlags |= 0x00001000;
13. getWindow().getDecorView().setSystemUiVisibility(uiFlags);
14. }
15. }

Android 動態隱藏顯示導航欄，狀態欄