"You can use the state passed in to onCreate() to determine whether
you are starting for the first time or not."
How do I do that?
I'm looking at onCreate --
public void onCreate(Bundle savedInstanceState) {
and I look at savedInstanceState, nothing jumps out at me...
On Aug 24, 10:39 pm, Dianne Hackborn <[email protected]> wrote:
> If you just want pressing back to not close the activity, just catch the
> BACK key and call Activity.moveTaskToBack() instead of letting it do the
> default behavior (of calling finish()).
>
> There is no need to use launchMode nor alwaysRetainTaskState.
>
> However, you DO need to deal with the normal lifecycle behavior -- in
> particular, when you are in the background, regardless of how this happened,
> the system is free to kill your process, so when the user next returns to
> your app a new instance of your activity will be created. You can use the
> state passed in to onCreate() to determine whether you are starting for the
> first time or not.
>
> Also, a "quit" menu on an android application is not normal, expected, nor
> desired. Please don't do it; there is no need. I think you will have a
> much better time if you try to design your app to follow the kind of flow
> shown by the existing applications, rather than trying to make it work like
> a desktop application.
>
> For example: you could save your current state to persistent storage when
> the user leaves the app, and restore it when they return, so they know they
> will always come back to the same thing. If it makes for them to actually
> throw away that state, you could have an option for them to reset the app so
> they can decide to do that at the time they want, rather than having to
> decide earlier on to have this happen as a side-effect of some unusual
> "quit" command.
>
>
>
> On Mon, Aug 24, 2009 at 10:16 PM, sdphil <[email protected]> wrote:
>
> > I want my application to work like this:
>
> > 1. When the user launches the application, it starts up.
> > 2. When the user hits back, or home, the application is still running
> > (although not visible).
> > 3. If the user hits "menu->quit" the application exits cleanly.
> > 4. If the user starts the application, hits "home" and selects the
> > application icon *again*, I want it to bring up the existing insance
> > of the application with whatever activity state it had before it left.
> > 5. I do not ever want more than one instance of my application to be
> > running (i.e. singleton).
> > 6. I always want to retain activity stack/state. when you come back
> > into the application, it's like you never left.
>
> > <?xml version="1.0" encoding="utf-8"?>
> > <manifest xmlns:android="http://schemas.android.com/apk/res/android";
> > package="com.company.gui"
> > android:versionCode="1"
> > android:versionName="1.0">
> > <application android:icon="@drawable/icon"
> > android:label="@string/app_name"
> > android:debuggable="true">
> > <activity android:name=".Main"
> > android:launchMode="singleTask"
> > android:alwaysRetainTaskState="true"
> > android:label="@string/app_name"
> > android:screenOrientation="portrait"
> > android:theme="@android:style/Theme.NoTitleBar">
> > <intent-filter>
> > <action android:name="android.intent.action.MAIN" />
> > <category
> > android:name="android.intent.category.LAUNCHER" />
> > </intent-filter>
> > </activity>
>
> > <activity android:name=".SplashScreen"
> > android:label="@string/app_name">
> > </activity>
>
> > </application>
> > <uses-sdk android:minSdkVersion="3" />
> > <uses-permission android:name="android.permission.INTERNET"></uses-
> > permission>
> > </manifest>
>
> > my main activity onCreate() looks like this:
>
> > startActivityForResult( new Intent(this, SplashScreen.class),
> > SPLASH_REQUEST_ID );
> > new Thread() {
> > public void run() {
> > try {
> > Thread.sleep(4 * 1000);
>
> > // put initialization stuff here.
>
> > } catch (InterruptedException e) {
> > e.printStackTrace();
> > }
> > finishActivity( SPLASH_REQUEST_ID );
> > }
> > }.start();
>
> > setContentView(R.layout.main);
>
> > If I leave the application by hitting home and then selecting the icon
> > again, it starts with the splash screen again!
>
> > any ideas on how to best fix this?
>
> > tia.
>
> --
> Dianne Hackborn
> Android framework engineer
> [email protected]
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails. All such
> questions should be posted on public forums, where I and others can see and
> answer them.
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