I have a homescreen in my app that doesn't have any tabs. It just has a series of buttons. Clicking a button launches the new activity that contains a tabbar at the top. This functions normally. I can click through all the tabs just fine. What I'd like to do though is add another tab that doesn't really have content but instead, when clicked, will take the user back to the homescreen. Is this possible, and if so how would I go about doing this?
What about just closing the "tabbar at the top"- Activity with finish(). Your homescreen is right under if you did not finish() it. This is IMHO the most basic way to navigate in Android.
Another way is from your "tabbar at the top"- Activity you could do this
Intent intent = new Intent(this,homescreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
This should kill your "tabbar at the top"- Activity and start homescreen activity if it's not started. If it's started it will pop up
Check this How do you use Intent.FLAG_ACTIVITY_CLEAR_TOP
Related
When my android app is started, main activity is launched. It displays a full screen image for 5 seconds, and then it jumps to another activity using intent. What i want is to kill the main activity, so that when user presses the back button of navigation bar, instead of opening main activity, the app gets closed.
One more thing:- i don't want to keep on destroying previous activities. I just want to kill that one activity(namely main activity), just after the intent is sent to new activity, Because i will be adding more activities.
We can say that my true purpose is destruction of main activity, and making the next activity(out of all other activities) as a activity through which the app can be leaved using back button of navigation bar.
I am not able to properly explain my problem in words, but please try to figure out my problem what what all i have mentioned.
In your MainAcitivity ,call the second activity like this:
Intent intent=new Intent(this,<your second activity.class>;
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
I would add
android:noHistory="true"
to the AndroidManifest.xml, specifically in the MainActivity definition
To kill Activity you have to use method finish();
In MainActivity in code, where you are starting next activity add finish();:
Intent i = new Intent(MainActivity.this, NextActivity.class);
startActivity(i);
finish();
What you're trying to achieve is called a splash screen.
In your main activity start another activity and if the user presses back on another activity, simply call o finish on main activity. Destroying parent activities before child is sort of messy.
I'd recommend googling splash screens through cold app booting.
So I would like to know how I can manage the back stack for activities that are launched from the NavigationDrawer. If I launch various activities via the NavigationDrawer by default Android will add them to the back stack and it would cause back button hell as user.
I imagine this should be a common problem so there must be a adequate solution.
But I need a solution to cater for the following 3 requirements.
Requirement 1)
I have 2 items in the navigation drawer (Activity1 and Activity2) which each launch different Activites. If I open the items via the navigation drawer a number of times when I press back I wish to go back to the initial starting activity and if I press back again I wish to exit the app
Requirement 2)
I launch Activity 1 from Nav then I launch Activity 2 and from within this activity I launch a new activity SubActivity. Now when I press back I would expect to be taken back to Activity 2 and then if I press back again I would expect to be taken to the initial Activity (not Activity 1), and then pressing back again would exit.
Requirement 3)
Same as above but actually the initial Activity is dynamic. So the landing Activity is defined by a user setting about what their first screen shall be.
As you can see I can not use NO_HISTORY flag because of (requirement 2)and I cant hardcode the parent of the Activities because of (requirement 3).
So other than overriding the back button is there any other way that i can manipulate the back stack ?
Thanks
Launch mode will not help. The answers lies in using TaskStackBuilder, its a very powerful api that allows you to define exactly what is to go into the backstack of the activity that you are about to launch. Here is how to use it.
Intent activityInBackstack = new Intent(this, ActivityA.class);
Intent activityToBeLaunched = new Intent(this, ActivityB.class);
TaskStackBuilder builder = TaskStackBuilder.create(this);
builder.addNextIntent(activityInBackstack);
builder.addNextIntent(activityToBeLaunched);
builder.startActivities();
So now if you are in ActivityB and you press back button you will always go to ActivityA. Pressing back on ActivityA would exit the app.
I want to create a "home" button that will bring the user back to the "Home" in my app from whatever activity they are in at the time. I have overridden the action bar so I won't be able to use one. My problem is that when
Home → A → B
I want to press the home button to return to Home. Originally I had the home button simply finish() the activity but in this case that will return me to A. Is there a way to do what I'm attempting?
Just to clarify this is an ImageButton on screen, not the hardware home button on the device.
You can use the Intent-Flag FLAG_ACTIVITY_CLEAR_TOP
If you don't have many Activities then you can simply create an onClick in each that is something like
Intent intent = new Intent(CurrentActivity.this, HomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
this flag will take you back to the "Home" Activity and clear all others off of the stack
If you have many Activities then it may be easier to create a base Activity from which to extend all others and include the home button functionality inside that base Activity
You can simply have your Image Button create an intent to start your home screen activity, assuming this is what you were looking for. within the OnClick of the button, generate an intent, and startActivity(intent)
I have application with main activity and some more.
On each other activity there is the logo of the application.
When user presses the logo button, I want to get back to the main activity.
I do not want to create new intent, since activity aready on the activity stack.
How can I get it - use the one on the stack?
How can I clear the whole activity stack, so back button will actually exit from the application instead of getting back to the previous activity?
Yoav
I do not want to create new intent, since activity aready on the activity stack.
If you start an activity (via intents or any other way) which was already started and is on the stack , then Android just takes that same instance of the activity and places it on top of the stack. A new instance is not created. Ofcourse this happens if you did not manually kill the activity (by calling finish() in it).
How can I clear the whole activity stack, so back button will actually exit from the application instead of getting back to the previous activity?
Its not recommended to override the back button to quit the application in every activity(Unless your app has strong reasons to do so). generally the app should let the user go back to the previous activity when he presses the back button (which is what a user might be expecting).
If you still would like to quit with the back button then you can override the back button function and launch the intent that leads to the home screen:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
I faced a somewhat similar problem. The following link might be helpful for you:
clearing stack of activities with just one press
Its very simple.
Don't call finish() on Home/Main activity.
For Ex: Say you have 4 activities.. If your requirement is like this .. Act1-->Act2-->Act3-->Act4-->Act1 . So, don't call finish() on Act1. But call finish() on Act2, Act3 while you are going to other activity. So when you click on logo in Act4, just call finish(). So, automatically you will come back to Act1 which is your Main activity.
If you have logo in Act2, Act3 also then call finish() on click of logo to go back to Main. But remember to call finish() on Act2 while you are going from Act2 to Act3
I am new in android and I have total 6-7 activities in my application. I want to know how can I manage my activities properly means when I move to the A->B->C->D like that. Then how can I move that the stack of these activities not created.
On moving from one activity to the other I am using the below code:
Intent intent=new Intent(current.this,next.class);
startActivityForResult(intent, 0);
And now if I want to move back on the earlier activity I used the code as:
Intent start = new Intent(current.this,next.class);
startActivity(start);
finishActivity(0);
Is there a special reason that you don't want to use the activity stack and let the activities handle themselves?
The Android system has done a very good job with the activity lifecycle. It allows you to start an Activity from different places without confusing the user because the back button will bring the user back to a different activity.
If you don't have a very good reason to not use the Android guideline try to stick to the way the system is doing it. Every other thing will only give you problems.
You are starting activities for a result but how I understand you you will never return to them.
You can start an Activity and after that just finish the current Activity. That way the activity will not be put on the back stack. Now you need to listen for back button pushes and create the activities that you want to bring the user to.
If you want to move from Activity A to D like going to the start/home screen of you app you do the following:
Intent goBackToA = new Intent(context, StdActivity.class);
goBackToA.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(goBackToA);
The flag FLAG_ACTIVITY_CLEAR_TOP will tell the system that if the backstack contains an instance of the Activity this activity will be shown and all activity that are between the current activity and the target activity are removed from the backstack. This allows you to go back to a home activity without creating huge loops that the user can move through with the back button.
To move back to the previous activity you don't have to create a new intent, you can simply call this.finish() on the one that should dissapear.
To move back to the previous activity you don't have to create a new intent, you can simply call this.finish() on the one that should dissapeear or you can press Back button to see the previous Activity .
whenever you want to navigate from one class to another use this code, may be this help you to navigate the Activity,
Intent nextpage = new Intent(CurrentActivity.this,NextActivity.class);
startActivity(nextpage);
this.finish();