Android :: Free Up Memory By Finishing An Activity After Calling Another?
Feb 25, 2010
Hopefully the title wasn't to confusing but what I meant was the following:
Lets say activity A starts activity B by calling:
Intent myIntent = new Intent(Activity_A.this, Activity_B.class);
Activity_A.this.startActivity(myIntent);
Could I save/free up some memory by finishing Activity_A after Activity_B is begun (if thats even possible). Maybe through the following:
Intent myIntent = new Intent(Activity_A.this, Activity_B.class);
Activity_A.this.startActivity(myIntent);
Activity_A.finish();
Or would Acitivty_A call startActivity() and wait for Activity_B to finish before it called finish()?
The idea would then be that when the users end with Activity_B, it would just restart Acitivity_A (and finish itself in a similar fashion)? Would this create too much overhead? Thanks for any answers and I apologize if the formatting of this post isn't correct.
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Nov 11, 2010
I want to get the hour of the calling from the Android CallLog. It is, the exactly hour that the user start the calling and if possible when he finishes the calling. Someone knows how to?
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Apr 21, 2009
I have made a game with just one activity.. I just replace the views when I want to change screen. The game runs fine for a really long time inspite of what ever I do within the game.
But once I close the main game, by calling finish on the only activity in the application, and then when I start again, within the next 30 secs it crashes telling VM budget exceeded..
When I don't have a dispose() or a delete method in JAVA.. how the, am I supposed to remove the objects used in memory.. moreover I have android:launchMode="singleInstance" in my manifest
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Jan 11, 2010
How can i make an activity go to background without calling its finish() method and return to the Parent activity that started this .I tried so much but it really dint help.So if you guys could help i would be very thankful.
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Sep 13, 2010
I want to show a simple toast, when exiting an application. The problem is, that the toast is not shown. I assume it is because the acitivity is finished or because of System.exit(0), but I don't know how to solve it. Does anyone have a tip?
In my activity I have the following code...
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Aug 10, 2010
Let's say you have a TabActivity with activities A1, A2, A3, and A4. When you click on the different tabs, no matter how many times you navigate between them, when you press the back key you leave the entire tab group, instead of navigating to a previous tab. My problem is, I am not using an actual TabActivity.
Does anyone know how to specify to Android that I'd like to mimic that behavior with a group of activities? The classic solution (that I know of) would to simply finish() the activity as you navigate away from it. That clears the stack, so that when you went from A1 and then to A2, and pressed back, you don't go back to A1.
The problem with using finish() is that I don't want the activity removed from memory. These activities load data from the network, so unless the data was cached, it would need to be reloaded on every navigation which would not be a great user experience.
I was looking at the flags which you can specify how to change this behavior: http://developer.android.com/guide/topics/fundamentals.html#acttask I tried using these: intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); But no matter what, when I go from A1 to A2 and press back, I always get back to A1.
In trying to clear the navigation stack without using finish()?
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Jul 9, 2010
I have a Contact Activity which is derived from ListActivity, which displays list of contacts, and on click of item, a new Activity Message Activity derived from ListActivity is initialized.Now I know, I can pack some information in Bundle and pass it before creating activity, but is there a way I can get instance of "ContactActivity" in onCreate method of "MessageActivity"?
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Oct 26, 2010
I have a rooted 2.2 android incredible phone but my reception at my house is terrible and I would like to make calls over my wifi connection for free.I have saw there are many different ways to doing this but either I am not setting it up right or they dont work any more. Some of these guides are confusing. Can anyone help? I have a google voice number and I tried setting up through sipgate but it keeps saying it fails to register on my phone and I don't know why. Whats the best and easiest way to get free wifi calls?
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May 28, 2010
Just to let my fellow Incredible Users know, I just got calling via WiFi working on my Inc.Using GV + Sipgate + Fring + GV Dial.
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May 28, 2010
Could someone write a tutorial for setting up free voice calling without using VZ minutes or point me to one that works with the Inc? It's kind of confusing because it's not just one app that gets it all going. Help! I'm out of minutes!
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Apr 15, 2010
After I've used a MediaStore.ACTION_IMAGE_CAPTURE intent to take a photo, when I try to retrieve the captured image, I sometimes get an out of memory error as shown below. The odd thing is the huge size of the memory trying to be allocated is always reported as 10,077,696 (x99c600). However, the image file is much smaller, typically around 750,000 bytes.Any suggestions on how to get around this problem? I'm testing this on a Nexus One with firmware version: 2.1-update1 and Build number: ERE27. Code...
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Dec 7, 2009
I have a TabActivity subclass that attempts to start a new activity via a menu item selection in onOptionsItemSelected.I am receiving the following exception which eludes me at the moment.I'm not sure why it thinks I am *not* in an activity!
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Nov 19, 2010
i am writing an app in which i need a background service to call an activity and show some result.
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Apr 4, 2010
me and my partners are working on developing a pwa client for android Am getting an error while calling an activity from another activity.the error is as follows...
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Oct 28, 2010
I am developing an app where a single activity is instantiated multiple times by itself. I guess you could think of it like a book where each activity is a page. At the end of the page (activity) the user presses a button to go to a new page. I fire off an Intent for the same Activity, but I push different data into the Bundle so that a different page is loaded. This works fine, and I like the fact that the user can back up to a previous point, but my question is whether this will eventually be a problem? What happens if this activity is instantiated 10 times, or 50, or 100? Will the device run out of memory, will GC come along and clean up old activities, or what? If GC does clean them up, what happens when the user presses Back and the previous Activity is no longer on the stack? Is it better to keep track of the user's path, finish() the activity, and override the Back button so that whether the user is moving forward or backwards, I only load a single Activity? Another approach I could take is to refresh all the data on the page so that it's still the same activity, but with new data. The Back button would not work as expected in this case.
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Apr 23, 2010
I'm writing an android application which listens the phone calling events. What I want to do is, if there is a call incomes or outgoes, an activity shows with my customized info.I want to this screen keeps showing during the calling period. However, if a call is coming, the system UI which shows the contact always appears on top of my activity.I've found some apps already realized this function, but mine can't.
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Sep 11, 2010
I'm using an AlarmManager to trigger an intent that broadcasts a signal. The following is my code:
CODE:................
I'm calling this code from an activity, so I don't know how I could be getting the following error...
CODE:....................
Is this really what you want?
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Oct 12, 2010
I have implemented a ListView in my Android application.
I bind to this ListView using a custom subclass of the ArrayAdapter class. Inside the overridden ArrayAdapter.getView(...) method, I assign an OnClickListener. In the onClick(View v) method of the OnClickListener, I want to launch a new activity.
I get the exception:
Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
How can I get the context that the ListView (the current Activity) is working under?
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Apr 26, 2010
The first Activity that loads in my application is an initialization activity, and once complete it loads a new Activity. I want to ensure if the user presses 'Back' they go straight to the Launcher, and not the initialization screen. Side note, is this even the best approach, or would this be better done with some kind of Intent Flag?
Is it correct to call finish() after calling startActivity() on the new activity?
CODE:...................
I'm still taking in the whole 'Message Queue' method of doing things in Android, and my assumption is that calling startActivity() and then finish() from my first Activity's onCreate() will log each respective message in the message queue, but finish execution of onCreate() before moving on to starting the next Activity and finishing my first one. Is this a correct understanding?
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Feb 2, 2010
Can any one guide me how to achieve this?
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Dec 3, 2009
I'm having this strange issue where upon exiting a subactivity that is translucent (android:theme="@android: style/Theme.Translucent" ) the onStop() method doesn't appear to be called. have a TimerTask that runs and is supposed to be terminated when the subactivity ends in the onStop() method, but I'm instead left with an orphaned thread running in the background. It go particularly bad when I ran the subactivity several times. When I revert to no theme, the onStop() method is called and the activity behaves properly. Is there something I missed about how Translucent activities'lifecycles differ from standard activities?
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Jul 23, 2010
I have two activities:
"a" that spawns thread for generating a dynamic array of values inside public void run() function.
"b", graphics activity that will help me draw rectangular pulses based on array values calculated in activity "a" (calculated in a's thread to be precise).
When I am in thread inside "a", how do I pass values of array to activity "b" and
call activity as well.
activity A
CODE:..........
activity B
CODE:..............
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Jul 1, 2010
I have an image which is taken from andorid by calling image _capture how do i upload it to a windows server?
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Jan 12, 2010
I open splash screen at the end i call finish() then i moved to browse page. At the browse page when i click on home button it hide the application.(b/c of Android's Multi tasking feature) When i go to Android's desktop launch application again it starts from splash screen. Android Platform 1.6
I open splash screen at the end i call finish() then i moved to browse page. At the browse page when i click on home button it hide the application.(b/c of Android's Multi tasking feature) When i go to Android's desktop launch application again it always starts from browse screen instead of splash screen why is that..............
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Nov 5, 2010
I created a thread in my activity, and that thread will print out the value of my instance variables in my activity after running for about 10 seconds. I pressed the back key to destroy my activity before the thread prints out the values, and when the thread reaches that line of code, it can still print out the values correctly. That means even though the activity is finished, the java object of the activity is still there. Will the object always be there? Or it is just waiting to be GCed? Or it will be killed only when Android needs memory?
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Jan 17, 2009
im not sure if this is a repost or if everyone already knows this but this is a very awesome tip. when i hard reset the phone and went to the market, i clicked "my downloads" and my apps that i had b4 were all listed and they said "free", (which meant i had to redownload). so it keeps your history according to your intial google sign in on the phone. ive hard reset bout 3 times just so i lower my market "MB". im at 3mb on my market and 50mb free of memory. i also have 67 apps installed. i highly recommend to hard reset your phone every now and then. it gives you so much more memory when you go and reinstall all your previous apps from "my downloads" section of the market. plus your contacts all sync to your gmail so you dont even have to worry bout losing any contacts. trust me, it really makes a difference in performance after the phone frees up that much memory. b4 i first did it i had like 27mb in my market and like 45 apps with 10mb of free mem on my phone. man did that suck. every time you go in the market or even when you uninstall an app it will still be eating your memory. try it out and leave some feed back. its really harmless. the only thing is that you will have to set your settings on some apps to how it was pre hard reset. for example, missed call, scoreboard, weather channel, and more. but its really worth it.
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Jul 2, 2010
I am trying to call my service class's stopService() method from my activity. But I don't know how to access stopservice method from my activity class. I have the below code but its not working. This is HomeScreen class:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
enablecheck = (CheckBox)findViewById(R.id.enablecheck);
enablecheck.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(enablecheck.isChecked()){
startService(new Intent(HomeScreen.this, AutoService.class));
} else {
stopService(new Intent(HomeScreen.this, AutoService.class));
} } });
}
This is Service Class:
public class AutoService extends Service {
private static final String TAG = "AutoService";
private Timer timer;
private TimerTask task;
@Override
public IBinder onBind(Intent intent) {
return null;
} @Override
public void onCreate() {
Toast.makeText(this, "Auto Service Created", Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
int delay = 5000; // delay for 5 sec.
int period = 5000; // repeat every sec.
timer = new Timer();
timer.scheduleAtFixedRate(task = new TimerTask(){
public void run() {
System.out.println("done");
} }, delay, period);
}
@Override
public boolean stopService(Intent name) {
// TODO Auto-generated method stub
timer.cancel();
task.cancel();
return super.stopService(name);
} }
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Jun 29, 2010
Is there a way that a Service can report back to the calling activity when the Service has reached a particular stage of processing? Consider a music player activity that initiates the actual music playing in the background as an Android Service. I want to detect and inform the Activity when the Service has reached the Mediaplayer's onPrepared. Is there a way that the Service can tell the calling Activity when the MediaPlayer's onPrepared is called, to let the Activity know that the audio is prepared and ready to play?I am basically looking to see if there is work around, rather than having a thread in the activity, pinging constantly to check if the Service has reached onPrepared.
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Aug 4, 2010
My MAIN activity is spawning a child activity that contains a ListView. While this ListView is being populated (through an AsyncTask), an indeterminate progress bar is shown.However, assuming that I am an impatient user and I press the BACK button, the progress bar is cancelled but I am left with a blank screen. I have to press BACK one more time to go back to the MAIN activity.I would like the app to go back directly to the MAIN activity by pressing BACK only once. Can somebody point me in the right direction? I am thinking I should call finish() somewhere but I don't know where to put it.
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Sep 13, 2010
I am having two activities, say activity A and B. Activity A is an ListActivity, and when the items in the list is selected, it will call startActivity() to bring up B. The problem here is that when I am in B and click the home key, and then go to the application launcher to resume my application, A will be brought up again. This time when I click a different item in A, it will bring up B with the old data of the previously selected item before the home key was clicked.
After examinzing the code, I found that the startActivity does not update the intent of B. I found a post here about the similar question, and the answer was to overwrite the onNewIntent. However, I found that it doesn't work, because this method never get called when the second time I call startActivity. I am sure that this is the same instance, because I've printed out the instance number. Is there any other ways to update the intent of the activity? Or I need some other settings to make the onNewIntent get called? I didn't set any flags or launch modes, so everything is default.
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