Android : Back Button Functioning Like The Emulators
May 10, 2010
I have 3 activities
1: Welcome screen
2:List of country
3:Details abt that country
Now i want to from activity 3 to 2
Currently wat im doing is
Intent i = new Intent(getApplicationContext(), selectcountry.class); startActivity(i);
This way the onCreate methode of 2nd activity is called ... and the whole list is populated again ...
But the back button of emulated function differently ...
what code should i write to make my back button behave like the emulators ...
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Nov 22, 2010
Basically what happens is my home button stops functioning. Instead of taking me back to my default screen, the screen will just flash. So I have to use the back arrow now.
I have launcherpro and beautiful widgets installed, but I dont know if either of these would cause the issue.
Ive had to reboot my phone several times before its fixed, then it will randomly happen again.
Has anyone experienced this? Please help. This is so frustrating and annoying.
I unstalled launcher pro plus and beautiful widgets and rebooted and its still happening. Im trying to find out if this is an issue others have experienced or if I have a defective unit that I need to return?
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Nov 7, 2010
I couldn't find anything on this so here we go.We all have the hard button for "Search".is it possible to have it search EVERYTHING but not give you Google suggestions first? (I can uncheck Google in the settings, but I want those suggestions as well, just not to clutter the top of the search) Let's say I want to find a Pizza place down the street from me.It's very possible it's already in my contacts, so when I type in "Johnny G's", I'd rather see any possible contacts first, and google searches after.But instead I get all google and youtube suggestions first and have to scroll through a long list to see if the contact is in my phone.This is the same for Songs and Artists as well.ALSO, anybody have a problem using the search button in Landscape?I type in something, then hit the back button to drop the keyboard, and it returns me back to the home screen.This works for dropping the keyboard in text messages because it's quicker than Holding the menu button.
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Jul 23, 2010
For periods of time, my Home & Back buttons doesn't work on my Desire. Sometimes, they work perfectly without any problems. My menu and search buttons always work fine. Is it a loose connection that i can repair somehow?
It has never been dropped or damaged in any way. I've tried to find someone with the same problem as I, but with no luck.
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Jul 16, 2010
I just got my first android phone, the droid x yesterday. Loving it so far but I've got a minor issue that drives me insane (even though it really is a non issue). I've got the volume keys on the right, and then the home and back keys at the bottom front. Whenever I click home or back, they do the home and back function, but also do volume up and volume down with every click. Its painfully annoying, because it vibrates and pops up the volume window over the top of everything, every time. And obviously, the home and back keys are two of the most clicked buttons on the phone, so its constantly going up n down. I think this also adds to battery drainage as its double functioning/working twice as much. Does anyone know of a way to disable the home lkey and back key from controlling my volume as well?
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Apr 10, 2010
I know that iphone users can jail break to get the old school emulators and I think that by now, there are some emulators in the apple market. My question is on a couple levels...
- Without jailbreaking, can you get roms on the iphone for free?
- If so how?
- How well does the on screen controller work
- Is the small screen you have to use on the iphone emu an issue?
Also add any feedback you like and your opinion as well. I'm just curious that's all. Hopefully one of you has experience in this field
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Jul 15, 2010
This is my first android device and i'm loving it... but one thing that irks me is the use, or lack thereof, of the back button.
As I am navigating menus and options in the Settings, I cannot simply go back one menu using the back key. For example, if I go to Settings->Battery Manager->Battery Profile Options and want to go back to the Settings screen, I cannot.
Pushing the back button does nothing and I can only go back to the Settings menu by going Home, then re-entering.
Another quirk regarding the back button is when reading emails. Using a regular email account such as Hotmail, I cannot simply read an email and go back to the inbox using the button.
It makes navigating the phone very tedious.
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Sep 2, 2010
I have 3 activities in my app: Activity1 -> Activity2 -> Activity3. Inside Activity3, if the user presses Back, I would like to return to Activity2. In Activity3's onPause event, I added a finish() statement. That's probably not even necessary, but I wanted to make sure this Activity gets cleaned up. This works fine.
However, while in Activity3, if the user presses Home or starts a new app (through notification bar or some other means), I want both Activity3 and Activity2 to finish. If the user returns to this app, he should resume with Activity1.
I have figured out how to do one or the other, but I can't figure out how to handle both cases, if it's even possible. Can I trap the "Back" button in Activity3 and send a message back to Activity2 telling it not to finish()? It seems like the Activities follow the same lifecycle flow (Pause, Stop) regardless of what you do to send them to the background. Just to answer the question of why I want this behavior, imagine that Activity1 is a login screen, Activity2 is a selection screen, and Activity3 is a content screen. If I press Back from the content page, I want to be able to make a new selection. If I exit via any other means (Home, notification bar), I want the user to be "logged out".
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Mar 31, 2009
I call WebView.clearHistory(), but I am still able to go back after doing so. I want to reuse a WebView, but I don't want the back button to allow the user to go back further than the current "session" of using the WebView. Anybody know what is the best way to handle this? I thought for sure that clearHistory() would do it.
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Oct 11, 2010
In my android application i have a video list screen,a buffering screen and a videoplayer screen.
As soon as the user clicks an item from videolist screen ,he is navigated to buffering screen and then to videoplayer.
In the buffering screen i am using Async task and doing the loading process in on background process.
Now my issue is like the user if has selested a video then gets navigated to buffering screen.But if the user clicks back when he is in buffering screen then initially he is getting navigated to videolist screen but immediately after that again he is navigated to videoplayer screen.
What i would like to have is either the back button should be made disable in buffering or should prevent the player tostart if back is clicked.
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Jun 16, 2009
In My code I am displaying a AlertDialog based on some condition.
CODE:.......................
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Jul 19, 2010
I'm finding that I'm using the back button A LOT whether browsing the web or just navigating the OS. It kind of sucks because the buttons on the droid x are well, really small, and sometimes hard to press because they are so narrow and flimsy feeling. And depending on how you are holding the phone, it could be a good bit of distance for your thumb to travel or I'm finding myself having to reposition the phone in my hands just to reach the back button, which you seem to need very frequently.
Anyone know of any kind of back 'swipe' implementation ? Like some software you can install that makes it if you swipe left to right on maybe the top bar it goes back?
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May 5, 2010
Instead of trying to grab the notification bar and swiping it down, simply start ABOVE the screen and swipe down. Fast or slow makes no difference.
You can swipe it back up, or simply hit the back button.
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Sep 8, 2013
In the last few days I am having to press the back button twice when using both the stock android browser and the latest version of chrome on my rooted S3.
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Jan 4, 2010
On pressing the back button, I'd like my application to go into the stopped state, rather than the destroyed state. In the Android docs it states: not all activities have the behavior that they are destroyed when BACK is pressed. When the user starts playing music in the Music application and then presses BACK, the application overrides the normal back behavior, preventing the player activity from being destroyed, and continues playing music, even though its activity is no longer visible
How do I replicate this functionality in my own application? I think there must be three possibilities.
1) Capture the back button press (as below) and then call whatever method(s) the home button calls...........
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Sep 1, 2009
Trying to the do as the title describes with the following code, but it doesn't seem to work. It just does nothing once i have altered the keyCode. Do i have to do something to the event?
..............
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Jul 15, 2010
I am a new to android development I want to override the default back button operation in android,please let me know how i can do this in code.
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Jul 24, 2010
For the past month, my WeatherEye app does not function. It starts, but all it get is "data not available".
Anyone else?
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Jul 4, 2010
This has been brought up before, but I was unable to find a satisfying answer. And I know it's a newbish question.
What is the difference between exiting an app with the back button compared to the home button? I am not talking about switching to the home screen, I am talking about a scenario when you want to exit an app. For example, you play a game, you're done - do you press home or back? Or, you're in the Facebook app and you want to exit to the homescreen - what do you press - back or home? At first, I thought both buttons do the same with the difference that home brings you to the homescreen instantly while back goes through your previous steps/pages/screens in the current app and then returns you the homescreen.
But later I noticed that 'reactivating' some apps that were exited via the back button cause them to 'reload' (the loading screen shows up - with certain games, grooveshark's loading screen, etc.) while they switch back instantly when "exited" with the home button.
I gather the way to 'leave' an app you don't plan on using for at least a short while (I am not talking about closing the app, I know it's up to Android, or some task-killer) is the back button, while home is more for task switching/starting new apps while old ones are running.
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Aug 12, 2009
I want to get the Text data value from Sub-Activity back. And everything is ok. But when the Sub-activity was opened, then I just click back "button" on the phone, it throw an exception error. I found on the android NotePad life-cycle control toturial but It's hard to understand. Can someone help me? This is my code:
public class SBooks extends ListActivity {
private String title_raw;
private SBooksDbAdapter mDbHelper;private static final int ACTIVITY_SEARCH = 0;private static final int SEARCH_ID = Menu.FIRST; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sbooks_list);
mDbHelper = new SBooksDbAdapter(this);
mDbHelper.open();
Create Menu Option
@Override public boolean onCreateOptionsMenu(Menu menu) {
boolean result = super.onCreateOptionsMenu(menu);
menu.add(0, SEARCH_ID, 0, R.string.menu_search);
return result;
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case SEARCH_ID:
Intent intent = new Intent(this, SBooksSearch.class);
startActivityForResult(intent, ACTIVITY_SEARCH);
return super.onOptionsItemSelected(item);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
super.onActivityResult(requestCode, resultCode, intent);
switch(requestCode){
case ACTIVITY_SEARCH:
Bundle bundle = intent.getExtras();
title_raw = bundle.getString(SBooksDbAdapter.KEY_TITLE_RAW);
if(title_raw!=null){
Cursor cursor = mDbHelper.searchData(title_raw);
String[] from = new String[]{ SBooksDbAdapter.KEY_ROWID,
SBooksDbAdapter.KEY_TITLE, SBooksDbAdapter.KEY_LYRICS };
int[] to = new int[]{ R.id.id, R.id.title, R.id.lyrics };
SimpleCursorAdapter adapter =
new SimpleCursorAdapter(this, R.layout.sbooks_row, cursor, from, to );
setListAdapter(adapter);This is my Sub-Activity:
public class SBooksSearch extends Activity {
private EditText mTextSearch;
private Button searchButton;
private SBooksDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sbooks_search);
mTextSearch = (EditText)findViewById(R.id.text_search);
searchButton = (Button)findViewById(R.id.btn_search);
searchButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
Intent intent = new Intent();
intent.putExtra(SBooksDbAdapter.KEY_TITLE_RAW, mTextSearch.getText().toString());
setResult(RESULT_OK, intent);
finish();
@Override
protected void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
@Override
protected void onPause(){
super.onPause();
checkState();
@Override
protected void onResume(){
super.onResume();
}private void checkState() {
This is Logcat:
08-12 18:44:39.211: WARN/InputManagerService(581): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@43719140 (uid=10004 pid=623)
08-12 18:44:39.510: INFO/ActivityManager(581): Displayed activity com.original.sbooks/.SBooks: 4934 ms
08-12 18:44:40.821: WARN/KeyCharacterMap(730): No keyboard for id 0
08-12 18:44:40.821: WARN/KeyCharacterMap(730): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
08-12 18:44:41.412: INFO/ARMAssembler(581): generated scanline__00000177:03515104_00001A01_00000000 [ 64 ipp] (89 ins) at [0x297608:0x29776c] in 952924 ns
08-12 18:44:41.520: INFO/ARMAssembler(581): generated scanline__00000177:03515104_00000A01_00000000 [ 46 ipp] (70 ins) at [0x297798:0x2978b0] in 517061 ns
08-12 18:44:42.171: INFO/ActivityManager(581): Starting activity: Intent { comp={com.original.sbooks/com.original.sbooks.SBooksSearch} }
08-12 18:44:52.196: WARN/ActivityManager(581): Launch timeout has expired, giving up wake lock!
08-12 18:44:52.279: WARN/ActivityManager(581): Activity idle timeout for HistoryRecord{436bfc80 {com.original.sbooks/com.original.sbooks.SBooksSearch}}
08-12 18:44:57.350: DEBUG/dalvikvm(620): GC freed 4103 objects / 231808 bytes in 75ms
08-12 18:45:05.130: DEBUG/dalvikvm(649): GC freed 2604 objects / 150112 bytes in 88ms
08-12 18:45:10.120: DEBUG/dalvikvm(623): GC freed 2750 objects / 149592 bytes in 71ms
08-12 18:45:11.920: INFO/ActivityManager(581): Displayed activity com.original.sbooks/.SBooksSearch: 29748 ms
08-12 18:45:17.263: WARN/ActivityManager(581): Activity pause timeout for HistoryRecord{436bfc80 {com.original.sbooks/com.original.sbooks.SBooksSearch}}
08-12 18:45:26.762: WARN/ActivityManager(581): Launch timeout has expired, giving up wake lock!
08-12 18:45:27.272: WARN/ActivityManager(581): Activity idle timeout for HistoryRecord{435a7760 {com.original.sbooks/com.original.sbooks.SBooks}}
08-12 18:46:04.905: DEBUG/AndroidRuntime(730): Shutting down VM
08-12 18:46:04.905: WARN/dalvikvm(730): threadid=3: thread exiting with uncaught exception (group=0x4000fe70)
08-12 18:46:04.905: ERROR/AndroidRuntime(730): Uncaught handler: thread main exiting due to uncaught exception
08-12 18:46:04.991: ERROR/AndroidRuntime(730): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=0, data=null} to activity {com.original.sbooks/com.original.sbooks.SBooks}: java.lang.NullPointerException
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread.deliverResults(ActivityThread.java:3005)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3047)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread.access$2300(ActivityThread.java:112)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1721)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.os.Looper.loop(Looper.java:123)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread.main(ActivityThread.java:3948)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at java.lang.reflect.Method.invokeNative(Native Method)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at java.lang.reflect.Method.invoke(Method.java:521)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at dalvik.system.NativeStart.main(Native Method)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): Caused by: java.lang.NullPointerException
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at com.original.sbooks.SBooks.onActivityResult(SBooks.java:111)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.Activity.dispatchActivityResult(Activity.java:3595)
08-12 18:46:04.991: ERROR/AndroidRuntime(730): at android.app.ActivityThread.deliverResults(ActivityThread.java:3001)
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Aug 25, 2010
I was wondering how or if it is possible to exclude activities from the back buttons history list? For example not letting the user back into the Splash Screen?
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Nov 24, 2010
I want to implement back button functionality in my Android Application similar to the back button in the Browser but without using Intents.
I m going to view a sport listview, in that i click football listview , in that i click my favorite player listview, suppose if the user press back button in football listview then i have to diaplay sport listview.
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Sep 1, 2009
I have a bunch of activities that are launching each other through intents. somehow, i got into a code state where some of the screens the back button (physical button) works, but others it does not.
I didn't do anything intentionally to disable the back button - what could be causing the back button not to work?
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Nov 2, 2010
on the ui i am having a back button displayed. there are three activities say A,B,C. Activity A is splash screen. Activity B is home screen. Activity C is edit screen. on edit screen only i am having a back button. when the user press that i open the activity B which also contains some sort of http request and response. i want that the previous activity from stack should get displayed? how can i achieve that? i am able to open previous activity on pressing the back button of device? when i press back button on device there doesnt goes any http request? i want to achieve this behaviour when i press the ui back button.
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Aug 17, 2010
My app chains some activities.
if you press the back button, you go back through old activities then you suddenly quit the application !
so I need to show a message like "do you really want to exit" if it's the last activity on stack
I know how to override the back button but i can't figure how to know how many activity are in history
CODE:..................
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Sep 1, 2010
I'm writing an application which will have two Activities, when the user presses the back button on the second activity a dialog should pop up asking the user to confirm the action. So how do I intercept this? I seriously doubt about this coz the backstack is a part of the OS itself. Has anyone found a workaround?
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Sep 27, 2010
I have an activity that calls the
CODE:.........
I would like to add a button to the notes_row.xml that displays at the bottom of the screen "on top of" the actual notes_row allowing the user to still scroll through the list but hit the button if they want. Every time I try to change the layout of notes_row, I get the button on each item in the list. I am pretty new to Android and I think I need to inflate the button somehow so that it is layered in front of the list but doesn't impede the list, how do I go about doing that?
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Mar 2, 2013
I'm trying to use the SWM and when I have everything all set up it tells me I have no device set up. I looked to see if I could find drivers for me Xperia X10 and all I kept getting linked to was the sony PC companion that apparently had those drivers installed. When I installed it and did all the set up stuff it still wouldn't recognize my phone other than as a removable disk. I have the USB debugging turned on, .Net framework installed, and supposed the drives yet it still won't read my phone.
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Apr 5, 2010
am new to this android development. I have index page and am displaying every links in the same page using div concept.Now i want to use the back button for my application i have developed code to handle the div and it is working in the AVD(Andriod Virtual Device 5556) but if i upload the apk into my device it is not working.
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Sep 17, 2009
what the default behaviour of the back button is, as far as the Android platform is concerned.
For example, in the Contacts Application, if I am creating a contact, I just key in a name, and the press back button, the contact is saved with only the name. Fair enough. But, I then edit this contact to include a phone number and press back button. This contact is updated which now includes the phone number. I again edit this contact. This time I remove the name, as well as the phone number and press the back button. I get a message saying, "Contact doesn't exist". In this case, it deletes the contact. :(
In the mail appllication, while composing, when I press back, it goes to the drafts folder. Thats good. But, if I just have to cancel this, and I don't want this to go to drafts folder. For this, I have to open the menu, and select "Cancel".
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