问题
I'd like to create a TRUE fullscreen activity, but there is always a black status bar on screen top. Android 9.0.
I've tried almost all I can find with Google and existing Apps with similar jobs. Manifest, code, style, AS sample fullscreen activity, all were tried.
styles.xml:
<style name="AppThemeA" parent="@style/Theme.AppCompat.Light.NoActionBar">
<item name="android:statusBarColor">@android:color/transparent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowActionBar">false</item>
<item name="android:windowFullscreen">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>
</style>
Manifest:
<activity android:name=".ScreenActivity" android:theme="@style/AppThemeA" />
Layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/rootLayout"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Kotlin (commented lines are tried and failed):
class ScreenActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
//setTheme(R.style.AppThemeDetector)
super.onCreate(savedInstanceState)
//window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN)
//window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)
//window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_FULLSCREEN
/*
window.decorView.systemUiVisibility = (
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
or View.SYSTEM_UI_FLAG_FULLSCREEN
)*/
setContentView(R.layout.activity_screen_detector)
...
}
}
The expected result:
What I actually got:
[[[[ Solution ]]]]
Found what caused this. You should set the App to FullScreen App in Settings -> Display.
https://www.gottabemobile.com/how-to-enable-full-screen-apps-on-galaxy-s10
So fixed. Thanks for all your help.
回答1:
I had a problem with displaying content through the notch or the cutout area. Found this in the docs:
LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES - Content renders into the cutout area in both portrait and landscape modes.
Key thing for me was this line in the activity style:
// Important to draw through the cutouts
<item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
I wanted to show an image in immersive mode, and when I click it, the system UI (status & navigation bars) should show up.
Here is my complete solution:
1- Methods to show/hide system UI in the Activity
private fun hideSystemUI() {
sysUIHidden = true
window.decorView.systemUiVisibility = (
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
// Hide the nav bar and status bar
or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // Hide nav bar
or View.SYSTEM_UI_FLAG_FULLSCREEN // Hide status bar
)
}
private fun showSystemUI() {
sysUIHidden = false
window.decorView.systemUiVisibility = (
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
// Set the content to appear under the system bars so that the
// content doesn't resize when the system bars hide and show.
or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION // layout Behind nav bar
or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN // layout Behind status bar
)
}
2- Make sure this in the root view of your xml layout
android:fitsSystemWindows="false"
3- The Style for the Full screen Activity will give status/navigation bars a semi transparent background when they show up:
<style name="FullscreenTheme" parent="AppTheme">
<item name="android:actionBarStyle">@style/FullscreenActionBarStyle</item>
<item name="android:windowActionBarOverlay">true</item>
<item name="android:windowBackground">@null</item>
<item name="metaButtonBarStyle">?android:attr/buttonBarStyle</item>
<item name="metaButtonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
<item name="android:statusBarColor">#50000000</item>
<item name="android:navigationBarColor">#50000000</item>
// Important to draw behind cutouts
<item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
</style>
<style name="FullscreenActionBarStyle" parent="Widget.AppCompat.ActionBar">
<item name="android:background">@color/sysTransparent</item>
</style>
回答2:
Here's a way to implement the edge-to-edge display starting from Android Q. The code is inspired by this blog.
First, in your styles.xml, modify the AppTheme like:
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
...
<item name="android:navigationBarColor">@android:color/transparent</item>
<item name="android:statusBarColor">@android:color/transparent</item>
</style>
Suppose, we need to make the MainActivity fullscreen, then in MainActivity.kt:
window.decorView.systemUiVisibility = (
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
or View.SYSTEM_UI_FLAG_FULLSCREEN
)
Also, check the docs here for enabling fullscreen mode.
回答3:
In addition to your code you just need adding this code before your setContentView in your activity
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
回答4:
Add this method in your activity
public static void hideSystemUI() {
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_LOW_PROFILE
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_IMMERSIVE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
}
before adding this call this below super.onCreate(savedInstanceState); onCreate
hideSystemUI();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
getWindow().getAttributes().layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
}
above attribute is use if your device have notch cutout for camera.
回答5:
Try this:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(getResources().getColor(R.color.colorPrimary));
} else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
Window window = mContext.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
int statusBarHeight = (int) dpToPx(24);
View view = new View(mContext);
view.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
view.getLayoutParams().height = statusBarHeight;
((ViewGroup) window.getDecorView()).addView(view);
view.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
}
dpToPx
public float dpToPx(float dp) {
return (dp * Resources.getSystem().getDisplayMetrics().density);
}
来源：https://stackoverflow.com/questions/56353716/how-to-remove-top-status-bar-black-background