[英]Show Navigation Bar on Android KitKat after hiding it
在我的應用中,我想讓用戶隱藏或顯示導航欄(后退,主頁,菜單)。 系統欄(電池,wifi,通知)應始終處於隱藏狀態。
我用以下代碼隱藏系統欄:
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
並且我成功隱藏了帶有以下標志的導航欄:
final static int flagsHide = 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;
但是我還沒有發現如何再次顯示導航欄。 我可以用標志來做還是需要其他東西? 系統欄必須保持不可見。
使用此標志再次顯示它
SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
SYSTEM_UI_FLAG_LAYOUT_STABLE
我的解決方案。
private void hideNavigationBar() {
// set navigation bar status, remember to disable "setNavigationBarTintEnabled"
final int flags = 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_IMMERSIVE_STICKY;
// This work only for android 4.4+
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
getWindow().getDecorView().setSystemUiVisibility(flags);
// Code below is to handle presses of Volume up or Volume down.
// Without this, after pressing volume buttons, the navigation bar will
// show up and won't hide
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(flags);
}
}
});
}
}
private void showNavigationBar() {
// set navigation bar status, remember to disable "setNavigationBarTintEnabled"
final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
// This work only for android 4.4+
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
getWindow().getDecorView().setSystemUiVisibility(flags);
// Code below is to handle presses of Volume up or Volume down.
// Without this, after pressing volume buttons, the navigation bar will
// show up and won't hide
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(flags);
}
}
});
}
}
區別在於removing "View.SYSTEM_UI_FLAG_HIDE_NAVIGATION"
。
最好的解決方案用於我所有的項目
public final class SystemUIUtil {
public static void hideDefaultControls(@NonNull final Activity activity) {
final Window window = activity.getWindow();
if (window == null) {
return;
}
window.clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
final View decorView = window.getDecorView();
if (decorView != null) {
int uiOptions = decorView.getSystemUiVisibility();
if (Build.VERSION.SDK_INT >= 14) {
uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
}
if (Build.VERSION.SDK_INT >= 16) {
uiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
}
if (Build.VERSION.SDK_INT >= 19) {
uiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
}
decorView.setSystemUiVisibility(uiOptions);
}
}
public static void showDefaultControls(@NonNull final Activity activity) {
final Window window = activity.getWindow();
if (window == null) {
return;
}
window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
window.addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
final View decorView = window.getDecorView();
if (decorView != null) {
int uiOptions = decorView.getSystemUiVisibility();
if (Build.VERSION.SDK_INT >= 14) {
uiOptions &= ~View.SYSTEM_UI_FLAG_LOW_PROFILE;
}
if (Build.VERSION.SDK_INT >= 16) {
uiOptions &= ~View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
}
if (Build.VERSION.SDK_INT >= 19) {
uiOptions &= ~View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
}
decorView.setSystemUiVisibility(uiOptions);
}
}
}
這將有助於顯示導航欄:
私人無效showSystemUI(){
mDecorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
mDecorView是您的父布局。 請參閱此鏈接以獲取更多詳細信息https://developer.android.com/training/system-ui/immersive.html
全屏全屏模式
activity.getWindow()
.getDecorView()
.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);
恢復
activity.getWindow()
.getDecorView()
.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
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