How to dim the status bar in a fragment - android

Im trying to dim the status bar at the bottom of the screen in a fragment, then show it again when the fragment goes away. Here's the code:
#Override
public void onPause()
{
super.onPause();
getActivity().getActionBar().show();
getView().setSystemUiVisibility(View.STATUS_BAR_VISIBLE);
}
#Override
public void onStart()
{
super.onStart();
getActivity().getActionBar().hide();
getView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
}
If the user launches my fragment, it works. It dims correctly. But if they hit "back", it seems like the status bar gets shown again correctly, but then after a split second, it goes dim again by itself. Has any one else seen this behavior? I think the system is doing something automatically with the status bar, but I cant figure out what it is. If I take out my call to show the status bar, it still shows it by itseft if the user hits back, but then a split second later, it gets dimmed again.

I had the same issue. I think the problem was that I wasn't setting the visibility on the main content view. I ended up copying the code from HoneycombGallery's ContentFragment.java and that finally worked for me.

Related

Hide ProgressBar widget

I start an Activity1 from my MainActivity using Intent.
Activity1 takes quite a while to load (perhaps the Ads) so to reassure users that my app has not crushed I display a Circular ProgressBar in a linear layout id loading. To do this I turn Visibility of loading to Visible in the onClick event of a button.
Coming back from Activity1 I set visibility to Invisible like this:
ActivityResultLauncher<Intent> resultLaunch = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result -> {
if(result.getResultCode()==111){
assert result.getData() != null;
String data= result.getData().getStringExtra("from");
if(data.equals("activity1")) {
loading.setVisibility(View.INVISIBLE);// back from Activity1 switch-off
loading
}
}
This works well but if user clicks the back button of his phone Progress Bar stays visible forever.
I have tried to set visibility in onResume() of MainActivity but it does not work.
I rather avoid to set up a timer. Any help?
#Override
public void onResume(){
super.onResume();
loading.setVisibility(View.INVISIBLE);// back from Activity1 switch-off loading
}
I turns out to work fine
This is happening because, the result code is not equals to 111. Change 111 with Result.Sucess and it will work fine. If you also want to hide the progress bar even if data is empty, add else statement and set visibility of progress bar to gone in there.

Handle back action for multiple view

I have an activity which have multiple piece of UI panel(you can think them as view in android), these panels will be invisible by default.
Now when user trigger action1, PanelA will display, when trigger action2, PanelB will display(at different location of the screen).
Both PanelA and PanelB is visible at the moment, now when user hit the back menu, the PanelB should disappear, and PanelA should disappear when hit the back menu again.
At first, I use View to hold different panels, however I found it is difficult to keep the state consist, for example, the activity will be a little different between PanelA and PanelB.
Then I found the fragment, however after I tried and tested, I found that the addTobackStack() can not apply to my us-case, since the PanelA and PanelB are at different location, android can not save their state by default.
So I wonder if there is any other solution for my requirement?
You need to manually handle this scenario inside onBackPressed() method of an Activity.
For instance -
#Override
public void onBackPressed() {
if (panelB.isOpened()) {
panelB.close()
} else if (panelA.isOpened()) {
panelA.close()
} else {
super.onBackPressed();
}
}
When panelB is opened, it will close only panelB and wont do anything else. Same goes for panelA, if its opened and when both the panel are closed then it will exit the app like normal.
I highly recommend to use DialogFragments here as you can call show() and dismiss() any point of time on that and they can handle custom views pretty well.
Hope it helps.

Android DrawerLayout.setDrawerLockMode() not working

I have a Navigation Drawer (appcompat v7) in my app which is working perfectly fine.
Now I want to disable it, until the user buys an in-app-purchase to unlock additional functionality. So in my Activity.onCreate(), after initializing the drawer and populating it, I am calling this function:
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
This function is not doing anything. The drawer continues to open and close as normal after tapping the drawer carat in the actionbar. I tried calling this function in Activity.onResume() without any difference.
What is the correct way to use this function?
(I tried looking online for answers, but couldn't find anything which addresses my issue). Any help is appreciated, as I am stuck on this issue for quite sometime now.
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
is only disabling the opening drawer layout by swiping till you click navigation drawer icon
keep a boolean variable
write mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED); in onStart() and also write below lines of code
#Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
if(!disabled)
{
if (item.getItemId() == android.R.id.home) {
if (mDrawerLayout.isDrawerOpen(mDrawerLinearLayout)) {
mDrawerLayout.closeDrawer(mDrawerLinearLayout);
} else {
mDrawerLayout.openDrawer(mDrawerLinearLayout);
}
}
}
return super.onOptionsItemSelected(item);
}
this will work for sure
When you call setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED) it locks opening and closing drawer only by swipes.
The drawer continues to open and close as normal after tapping the drawer carat in the action bar because your drawer will still respond to calls to openDrawer(int), closeDrawer(int) although a drawer is locked.
You need to add some logic in your action bar menu button listener and not to call openDrawer(int) when you don't want it to open.
Btw, it is okay to call setDrawerLockMode(int) in onŠ”reate
There is a bug with DrawerLayout and used gravity. I have reported it here:
https://issuetracker.google.com/issues/136738274

status bar flicker when exiting fullscreen activity

I noticed a pretty irritating flicker that happens in the following scenario: display a fullscreen activity and then launch another activity that is not fullscreen.
In my app I use an action bar at the top of the second activity and I clearly see how a flickering is done when switching between the activities.
When the status bar appears, it doesn't smoothly push my activity down, but very quickly and with this annoying flicker.
Is there some API I can use to control this behaviour?
Or some other workaround?
I had same issue.
Below workaround fixed it, put this code before finishing your first activity.
Handler handler = new Handler();
handler.post(new Runnable() {
#Override
public void run() {
YourActivity.this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
}
});

How to tell the activity has been covered by the notification area?

Usually, Android calls onPause on your Activity when it starts being obscured or hidden, followed by onStop when it's no longer shown at all. In my game, I pause the game in onPause, so the user doesn't lose the game while looking elsewhere.
However, when the user drags down the notification bar, it covers my Activity, but neither onPause nor onStop are called. This doesn't seem to be mentioned in the documentation. The game ticks away in the background with nobody looking at it. Is there some other way to tell my Activity has been obscured when this happens, so I can pause the game before the user loses? I can't find anything at all about this on the Android Developers site.
The onWindowFocusChanged(boolean hasFocus) of Activity should serve the required purpose. It is called with false when the notification area is dragged down, and with true once the area is dragged back up. The corresponding Android documentation states that this method "is the best indicator of whether this activity is visible to the user". It also explicitly states that the callback is triggered when the "status bar notification panel" is shown.
It is important to note that this method is also called in other situations. A good example is the display of an AlertDialog. onWindowFocusChanged is even called when the activity itself shows an AlertDialog. This might require consideration, depending on if your game uses AlertDialogs or something else which causes a focus change.
In a scenario similar to the one described in this question, we've used the onWindowFocusChanged method successfully, e.g. on a Nexus 5 with Android 4.4, or a Sony Xperia Tablet with Android 4.1.
Since the StatusBarManager isn't part of the official API, I find it unlikely that there is a way to detect it. Even using reflection, none of the statusbar-classes seem to have a hook for listeners.
If it is feasible, you could deactivate the statusbar. Otherwise, I think you are out of luck :(
Interacting with the status bar has 2 cases:
Case 1: If your activity is already hiding the status bar, and the user pulls down the status bar area without showing the notification: this can be handled by registering OnSystemUiVisibilityChangeListener listener to get notified of system UI visibility changes
boolean mStatusBarShown;
View decorView = getWindow().getDecorView();
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) {
// TODO: The system bars are visible. Make any desired
// adjustments to your UI, such as showing the action bar or
// other navigational controls.
mStatusBarShown = true;
} else {
// TODO: The system bars are NOT visible. Make any desired
// adjustments to your UI, such as hiding the action bar or
// other navigational controls.
mStatusBarShown = false;
}
}
});
Case 2: If the status bar is already shown to the user, and the user pulls it down to show the notification area; to detect that, you need to override onWindowFocusChanged(boolean hasFocus) in the
activity, where hasFocus parameter value will be 'false' in case the user pulls the status bar down, and when the user pushes the status bar up again; then the onWindowFocusChanged will be invoked again but this time hasFocus will be true
#Override
public void onWindowFocusChanged(boolean hasFocus) {
// handle when the user pull down the notification bar where
// (hasFocus will ='false') & if the user pushed the
// notification bar back to the top, then (hasFocus will ='true')
if (!hasFocus) {
Log.i("Tag", "Notification bar is pulled down");
} else {
Log.i("Tag", "Notification bar is pushed up");
}
super.onWindowFocusChanged(hasFocus);
}
Check this link for more info.

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