是否可以永久删除活动上的导航栏？我想用平板电脑上屏幕按钮上显示的按钮删除栏，而不是操作栏。 Here。
我知道不建议这样做，我没有做出这个决定，但我需要这样做。在我的布局上，还有另一个按钮可以离开活动。我的应用程序的其余部分可以拥有并确实拥有导航栏。
我找到了这段代码并对其进行了一些调整。问题是，即使我隐藏导航栏，也会留下一个黑色空间。我想系统会计算屏幕尺寸并考虑到导航栏？
public static class Content extends ImageView implements View.OnSystemUiVisibilityChangeListener, View.OnClickListener, ActionBar.OnMenuVisibilityListener {
Activity mActivity;
TextView mTitleView;
Button mPlayButton;
SeekBar mSeekView;
boolean mAddedMenuListener;
boolean mMenusOpen;
boolean mPaused;
boolean mNavVisible;
int mLastSystemUiVis;
Runnable mNavHider = new Runnable() {
@Override public void run() {
setNavVisibility(false);
}
};
public Content(Context context, AttributeSet attrs) {
super(context, attrs);
setOnSystemUiVisibilityChangeListener(this);
setOnClickListener(this);
}
public void init(Activity activity, TextView title, Button playButton,
SeekBar seek) {
// This called by the containing activity to supply the surrounding
// state of the video player that it will interact with.
mActivity = activity;
mTitleView = title;
mPlayButton = playButton;
mSeekView = seek;
mPlayButton.setOnClickListener(this);
setPlayPaused(true);
}
@Override protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mActivity != null) {
mAddedMenuListener = true;
mActivity.getActionBar().addOnMenuVisibilityListener(this);
}
}
@Override protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (mAddedMenuListener) {
mActivity.getActionBar().removeOnMenuVisibilityListener(this);
}
}
@Override public void onSystemUiVisibilityChange(int visibility) {
// Detect when we go out of nav-hidden mode, to clear our state
// back to having the full UI chrome up. Only do this when
// the state is changing and nav is no longer hidden.
int diff = mLastSystemUiVis ^ visibility;
mLastSystemUiVis = visibility;
if ((diff&SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0
&& (visibility&SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) {
setNavVisibility(true);
}
}
@Override protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
// When we become visible or invisible, play is paused.
setPlayPaused(true);
}
@Override public void onClick(View v) {
if (v == mPlayButton) {
// Clicking on the play/pause button toggles its state.
setPlayPaused(!mPaused);
} else {
// Clicking elsewhere makes the navigation visible.
setNavVisibility(true);
}
}
@Override public void onMenuVisibilityChanged(boolean isVisible) {
mMenusOpen = isVisible;
setNavVisibility(true);
}
void setPlayPaused(boolean paused) {
mPaused = paused;
mPlayButton.setText(paused ? R.string.play : R.string.pause);
setKeepScreenOn(!paused);
setNavVisibility(true);
}
void setNavVisibility(boolean visible) {
int newVis = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| SYSTEM_UI_FLAG_LAYOUT_STABLE;
if (!visible) {
newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_FULLSCREEN
| SYSTEM_UI_FLAG_HIDE_NAVIGATION;
}
// If we are now visible, schedule a timer for us to go invisible.
if (visible) {
Handler h = getHandler();
if (h != null) {
h.removeCallbacks(mNavHider);
if (!mMenusOpen && !mPaused) {
// If the menus are open or play is paused, we will not auto-hide.
h.postDelayed(mNavHider, 1500);
}
}
}
// Set the new desired visibility.
setSystemUiVisibility(newVis);
mTitleView.setVisibility(visible ? VISIBLE : INVISIBLE);
mPlayButton.setVisibility(visible ? VISIBLE : INVISIBLE);
mSeekView.setVisibility(visible ? VISIBLE : INVISIBLE);
}
}
AFAIK，如果没有root访问权限，这是不可能的。能够拥有一个无法通过系统按钮退出的应用程序将是一个安全问题。
编辑，请看这里：Hide System Bar in Tablets
有一个解决方案从KitKat（4.4.2）开始，称为Immersive Mode：https://developer.android.com/training/system-ui/immersive.html
基本上，您应该将此代码添加到onResume（）方法：
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
您可以
有两种方法（都需要设备root）：
1-首先，在adb window command中打开设备，然后运行以下命令：
adb shell >
su >
pm disable com.android.systemui >
并得到它只是做同样但改变disable到enable。
2-秒方式，将以下行添加到设备的build.prop文件的末尾：
qemu.hw.mainkeys = 1
然后把它拿回来就把它移除。
如果您不知道如何编辑build.prop文件：
你可以隐藏导航栏，只需在你的onCreate()上调用这个方法，
public void FullScreencall() {
if(Build.VERSION.SDK_INT < 19){
View v = this.getWindow().getDecorView();
v.setSystemUiVisibility(View.GONE);
} else {
//for higher api versions.
View decorView = getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
decorView.setSystemUiVisibility(uiOptions);
}
}
这将隐藏整个nagiation panel.hope它可以帮助你
更改清单中的主题。
如果要隐藏一个活动的导航栏，可以使用：
<activity
android:name="Activity Name"
android:theme="@android:style/Theme.Black.NoTitleBar"
android:label="@string/app_name" >
如果要隐藏整个应用程序的导航栏，可以使用：
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.Black.NoTitleBar" >
观看DevBytes video（由Roman Nurik撰写）并阅读文档中的最后一行后，其中写道：
注意：如果您喜欢IMMERSIVE_STICKY的自动隐藏行为，但也需要显示您自己的UI控件，只需使用IMMERSIVE结合Handler.postDelayed（）或类似的东西，几秒后重新进入沉浸式模式。
答案，radu122给了我，为我工作。只需设置一个处理程序，你就可以了。
这是适合我的代码：
@Override
protected void onResume() {
super.onResume();
executeDelayed();
}
private void executeDelayed() {
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
// execute after 500ms
hideNavBar();
}
}, 500);
}
private void hideNavBar() {
if (Build.VERSION.SDK_INT >= 19) {
View v = getWindow().getDecorView();
v.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
谷歌说“几秒钟后” - 但我希望尽快提供这项功能。也许我稍后会改变这个值，如果必须的话，我会更新这个答案。
首先隐藏在活动的OnResume（）中，然后保持隐藏，如下所示：
decorView.setOnSystemUiVisibilityChangeListener
(new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
// Note that system bars will only be "visible" if none of the
// LOW_PROFILE, HIDE_NAVIGATION, or FULLSCREEN flags are set.
if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
//visible
hideSystemUI();
}
}
}
});`
public void hideSystemUI() {
// Set the IMMERSIVE flag.
// Set the content to appear under the system bars so that the content
// doesn't resize when the system bars hide and show.
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
| View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
| View.SYSTEM_UI_FLAG_IMMERSIVE);
}
我的解决方案，只隐藏导航栏，是：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final View decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener (new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
});
}
@Override
protected void onResume() {
super.onResume();
final int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
final View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(uiOptions);
}
来自Google文档：
您可以使用SYSTEM_UI_FLAG_HIDE_NAVIGATION标志隐藏Android 4.0及更高版本上的导航栏。此代码段隐藏了导航栏和状态栏：
View decorView = getWindow().getDecorView();
// Hide both the navigation bar and the status bar.
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
// a general rule, you should design your app to hide the status bar whenever you
// hide the navigation bar.
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
http://developer.android.com/training/system-ui/navigation.html