问题描述
沉浸式(-sticky)模式无法完全隐藏导航栏。当我点击并显示弹出菜单时,导航栏(具有透明背景)像僵尸一样升起。这种现象在 API-29 或更早版本和 API-30 上都是一样的。
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.inflateMenu(R.menu.main);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
hidesystemUI();
}
}
private void hidesystemUI() {
Window window = getwindow();
View decorView = window.getDecorView();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
WindowInsetsController windowInsetsController = decorView.getwindowInsetsController();
windowInsetsController.setSystemBarsBehavior(
WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
);
windowInsetsController.hide(
WindowInsets.Type.statusBars()
| WindowInsets.Type.navigationBars()
);
window.setDecorFitsSystemWindows(false);
} else {
window.addFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN
| WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
);
decorView.setsystemUIVisibility(
View.SYstem_UI_FLAG_IMMERSIVE_STICKY
| View.SYstem_UI_FLAG_FULLSCREEN
| View.SYstem_UI_FLAG_HIDE_NAVIGATION
| View.SYstem_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYstem_UI_FLAG_LAYOUT_HIDE_NAVIGATION
);
}
}
}
布局:
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:popupTheme="@style/Theme.AppCompat.Light"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
我已经阅读了an old similar question,但直到现在还没有答案。
解决方法
我认为这种行为是有意为之。
当主窗口聚焦时隐藏导航栏是有限的。当弹出窗口被激活时,就像对话一样,当主窗口丢失时,它具有焦点。于是导航栏重新出现。