我正在开发一款针对Android的游戏，我希望我的Activity全屏（甚至删除某些设备中保持在底部的导航栏），所以我在我的onResume()上写了这个Activity：
super.onResume();
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);
但奇怪的是，这导致我的Activity仅在第二次点击后检测到按钮点击。我甚至尝试在活动标签内的清单中使用android:theme="@android:style/Theme.NoTitleBar.Fullscreen"，但这并没有解决按钮错误。有人能帮助我吗？
答案 0 :(得分：0)
此问题与"Immersive mode failing: Is it the code, or the virtual device?"中的问题非常相似。主要问题似乎是，在某些设备上，View.SYSTEM_UI_FLAG_HIDE_NAVIGATION仅导致每隔一个ACTION_DOWN收到触摸事件。
不幸的是，没有报道任何解决方案。但是，您可以通过阅读其他问题及其包含的代码来获得更多理解。
顺便说一句，toggleHideyBar()使用^=来切换导航用户界面。您将使用|=代替，因为您要设置标志，而不是切换它们。另外，请注意toggleHideyBar()不会替换所有现有标志（就像您在代码中所做的那样），但只修改它关心的特定标志 - 这样更安全，因为您不想意外更改任何其他标志标志。
答案 1 :(得分：0)
我基于InmersiveMode SDK示例创建了下一个类，您可以为您的requeriments改进此类：
/**
* Created by clarkxp on 10-02-15.
*/
public class SystemUIController {
public FragmentActivity actionBarActivity;
public static final int FLAG_LAYOUT_IN_SCREEN_OLDER_DEVICES = 0x1;
public static final int FLAG_FULLSCREEN = 0x2;
public static final int FLAG_HIDE_NAVIGATION = FLAG_FULLSCREEN | 0x4;
protected int mFlags;
private int mShowFlags;
/**
* Flags for {@link View#setSystemUiVisibility(int)} to use when hiding the
* system UI.
*/
private int mHideFlags;
/**
* Flags to test against the first parameter in
* {@link android.view.View.OnSystemUiVisibilityChangeListener#onSystemUiVisibilityChange(int)}
* to determine the system UI visibility state.
*/
private int mTestFlags;
/**
* Whether or not the system UI is currently visible. This is cached from
* {@link android.view.View.OnSystemUiVisibilityChangeListener}.
*/
private boolean mVisible = true;
private View mAnchorView;
private OnInmersiveModeListener onInmersiveModeListener;
public SystemUIController(ActionBarActivity actionBarActivity) {
this.actionBarActivity = actionBarActivity;
onInmersiveModeListener = (OnInmersiveModeListener) actionBarActivity;
mShowFlags = View.SYSTEM_UI_FLAG_VISIBLE;
mHideFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;
mTestFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;
if ((mFlags & FLAG_FULLSCREEN) != 0) {
// If the client requested fullscreen, add flags relevant to hiding
// the status bar. Note that some of these constants are new as of
// API 16 (Jelly Bean). It is safe to use them, as they are inlined
// at compile-time and do nothing on pre-Jelly Bean devices.
mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_FULLSCREEN;
}
if ((mFlags & FLAG_HIDE_NAVIGATION) != 0) {
// If the client requested hiding navigation, add relevant flags.
mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
mTestFlags |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
}
}
public boolean isVisible() {
return mVisible;
}
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 = actionBarActivity.getWindow().getDecorView().getSystemUiVisibility();
int newUiOptions = uiOptions;
// END_INCLUDE (get_current_ui_flags)
// BEGIN_INCLUDE (toggle_ui_flags)
// 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;
}
actionBarActivity.getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
//END_INCLUDE (set_ui_flags)
boolean isImmersiveModeEnabled =
((newUiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == newUiOptions);
if (isImmersiveModeEnabled) {
// Log.i(TAG, "Turning immersive mode mode off. ");
mVisible = false;
} else {
mVisible = true;
// Log.i(TAG, "Turning immersive mode mode on.");
}
onInmersiveModeListener.inmersiveChanged(isVisible());
}
public interface OnInmersiveModeListener{
public void inmersiveChanged(boolean visible);
}
}
要在您的活动中使用此代码：
public class ActivityExample extends ActionBarActivity implements SystemUIController.OnInmersiveModeListener {
private SystemUIController systemUIController;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myLayout);
systemUIController = new SystemUIController(this);
Button button = (Button) findViewById(R.id.myButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
systemUIController.toggleHideyBar();
}
});
}
@Override
public void inmersiveChanged(boolean visible) {
Toast.makeText(this,"Is Visible? "+visible,Toast.LENGTH_SHORT).show();
}
}