Android Dimming the System Bars 隐藏虚拟按键

官方原文链接

Dim the Status and Navigation Bars

(隐藏状态栏和导航条)

You can dim the status and notification bars on Android 4.0 and higher using the SYSTEM_UI_FLAG_LOW_PROFILE flag, as follows:

// This example uses decor view, but you can use any visible view.
View decorView = getActivity().getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_LOW_PROFILE;
decorView.setSystemUiVisibility(uiOptions);

As soon as the user touches the status or navigation bar, the flag is cleared, causing the bars to be undimmed. Once the flag has been cleared, your app needs to reset it if you want to dim the bars again.

(如果点击了屏幕,这个Flag就被清除了,系统虚拟按钮将被显示,如果你还需要dim,请再次设置.)

Reveal the Status and Navigation Bars(显示状态栏和导航条)

If you want to programmatically clear flags set with setSystemUiVisibility(), you can do so as follows:

View decorView = getActivity().getWindow().getDecorView();
// Calling setSystemUiVisibility() with a value of 0 clears
// all flags.
decorView.setSystemUiVisibility(0);

官方sample

代码片:

/**
* Detects and toggles immersive mode (also known as "hidey bar" mode).
*/
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 = getActivity().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(TAG, "Turning immersive mode mode off. ");
} else {
Log.i(TAG, "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;
}

getActivity().getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
//END_INCLUDE (set_ui_flags)
}

在你的Activity种添加这样的一句代码:

<activity android:name=".MainActivity"
android:label="@string/app_name"
android:uiOptions="splitActionBarWhenNarrow">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

亲测可行,完毕.