am fe5cd35d: am ea779669: am 159a5ff7: fix a few bugs. xxhpi bug: 10071401...

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<h2 id="StartActivity">Start an Activity with the Intent</h2>

<div class="figure" style="width:200px">

<div class="figure" style="width:200px;margin-top:-10px">

  <img src="{@docRoot}images/training/basics/intents-choice.png" alt="" />

  <p class="img-caption"><strong>Figure 1.</strong> Example of the selection dialog that appears

when more than one app can handle an intent.</p>

<h2 id="AppChooser">Show an App Chooser</h2>

<div class="figure" style="width:200px">

<div class="figure" style="width:200px;margin-top:-10px">

  <img src="{@docRoot}images/training/basics/intent-chooser.png" alt="" />

  <p class="img-caption"><strong>Figure 2.</strong> Example of the chooser dialog that appears

when you use {@link android.content.Intent#createChooser createChooser()} to ensure

that the user is always shown a list of apps that respond to your intent.</p>

  <p class="img-caption"><strong>Figure 2.</strong> A chooser dialog.</p>

</div>

<p>Notice that when you start an activity by passing your {@link android.content.Intent} to {@link

the intent, the user can select which app to use by default (by selecting a checkbox at the bottom

of the dialog; see figure 1). This is nice when performing an action for which the user

generally wants to use the same app every time, such as when opening a web page (users

likely use just one web browser) or taking a photo (users likely prefer one camera). However, if

the action to be performed could be handled by multiple apps and the user might

likely use just one web browser) or taking a photo (users likely prefer one camera).</p>

<p>However, if the action to be performed could be handled by multiple apps and the user might

prefer a different app each time—such as a "share" action, for which users might have several

apps through which they might share an item—you should explicitly show a chooser dialog,

which forces the user to select which app to use for the action every time (the user cannot select a

apps through which they might share an item—you should explicitly show a chooser dialog

as shown in figure 2. The chooser dialog

forces the user to select which app to use for the action every time (the user cannot select a

default app for the action).</p>

<p>To show the chooser, create an {@link android.content.Intent} using {@link

Intent intent = new Intent(Intent.ACTION_SEND);

...

// Always use string resources for UI text. This says something like "Share this photo with"

String title = getResources().getText(R.string.chooser_title);

// Always use string resources for UI text.

// This says something like "Share this photo with"

String title = (String) getResources().getText(R.string.chooser_title);

// Create and start the chooser

Intent chooser = Intent.createChooser(intent, title);

startActivity(chooser);

@Override

protected void onCreate(Bundle savedInstanceState) {

    ...

    RetainFragment mRetainFragment =

    RetainFragment retainFragment =

            RetainFragment.findOrCreateRetainFragment(getFragmentManager());

    mMemoryCache = RetainFragment.mRetainedCache;

    mMemoryCache = retainFragment.mRetainedCache;

    if (mMemoryCache == null) {

        mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {

            ... // Initialize cache here as usual

        }

        mRetainFragment.mRetainedCache = mMemoryCache;

        retainFragment.mRetainedCache = mMemoryCache;

    }

    ...

}