SDK only: now that support lib is in SDK, we can link to it.

Update some of the platform documentation to directly link to
relevent support lib docs.  Yay!

Also improve BroadcastReceiver documentation to more clearly
discussion security around receivers, and how the support
lib's LocalBroadcastManager can help.

Change-Id: I563c7516d5fbf91ab884c86bc411aff726249e42

Author: Dianne Hackborn

core/java/android/app/Fragment.java

@@ -181,7 +181,8 @@ public FragmentState[] newArray(int size) {
  *
  * While the Fragment API was introduced in
  * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API
- * is also available for use on older platforms.  See the blog post
+ * at is also available for use on older platforms through
+ * {@link android.support.v4.app.FragmentActivity}.  See the blog post
  * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html">
  * Fragments For All</a> for more details.
  *

core/java/android/app/FragmentManager.java

@@ -51,6 +51,13 @@
  * <p>For more information about using fragments, read the
  * <a href="{@docRoot}guide/topics/fundamentals/fragments.html">Fragments</a> developer guide.</p>
  * </div>
+ *
+ * While the FragmentManager API was introduced in
+ * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API
+ * at is also available for use on older platforms through
+ * {@link android.support.v4.app.FragmentActivity}.  See the blog post
+ * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html">
+ * Fragments For All</a> for more details.
  */
 public abstract class FragmentManager {
     /**

core/java/android/app/LoaderManager.java

@@ -36,7 +36,8 @@
  *
  * While the LoaderManager API was introduced in
  * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API
- * is also available for use on older platforms.  See the blog post
+ * at is also available for use on older platforms through
+ * {@link android.support.v4.app.FragmentActivity}.  See the blog post
  * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html">
  * Fragments For All</a> for more details.
  *

core/java/android/content/BroadcastReceiver.java

@@ -28,11 +28,21 @@
 
 /**
  * Base class for code that will receive intents sent by sendBroadcast().
- * You can either dynamically register an instance of this class with
+ *
+ * <p>If you don't need to send broadcasts across applications, consider using
+ * this class with {@link android.support.v4.content.LocalBroadcastManager} instead
+ * of the more general facilities described below.  This will give you a much
+ * more efficient implementation (no cross-process communication needed) and allow
+ * you to avoid thinking about any security issues related to other applications
+ * being able to receive or send your broadcasts.
+ *
+ * <p>You can either dynamically register an instance of this class with
  * {@link Context#registerReceiver Context.registerReceiver()}
  * or statically publish an implementation through the
  * {@link android.R.styleable#AndroidManifestReceiver &lt;receiver&gt;}
- * tag in your <code>AndroidManifest.xml</code>. <em><strong>Note:</strong></em>
+ * tag in your <code>AndroidManifest.xml</code>.
+ * 
+ * <p><em><strong>Note:</strong></em>
  * &nbsp;&nbsp;&nbsp;If registering a receiver in your
  * {@link android.app.Activity#onResume() Activity.onResume()}
  * implementation, you should unregister it in 
@@ -86,8 +96,8 @@
  * 
  * <p>Topics covered here:
  * <ol>
+ * <li><a href="#Security">Security</a>
  * <li><a href="#ReceiverLifecycle">Receiver Lifecycle</a>
- * <li><a href="#Permissions">Permissions</a>
  * <li><a href="#ProcessLifecycle">Process Lifecycle</a>
  * </ol>
  *
@@ -98,32 +108,39 @@
  * developer guide.</p>
  * </div>
  *
- * <a name="ReceiverLifecycle"></a>
- * <h3>Receiver Lifecycle</h3>
- * 
- * <p>A BroadcastReceiver object is only valid for the duration of the call
- * to {@link #onReceive}.  Once your code returns from this function,
- * the system considers the object to be finished and no longer active.
- * 
- * <p>This has important repercussions to what you can do in an
- * {@link #onReceive} implementation: anything that requires asynchronous
- * operation is not available, because you will need to return from the
- * function to handle the asynchronous operation, but at that point the
- * BroadcastReceiver is no longer active and thus the system is free to kill
- * its process before the asynchronous operation completes.
- * 
- * <p>In particular, you may <i>not</i> show a dialog or bind to a service from
- * within a BroadcastReceiver.  For the former, you should instead use the
- * {@link android.app.NotificationManager} API.  For the latter, you can
- * use {@link android.content.Context#startService Context.startService()} to
- * send a command to the service.
- * 
- * <a name="Permissions"></a>
- * <h3>Permissions</h3>
- * 
+ * <a name="Security"></a>
+ * <h3>Security</h3>
+ *
+ * <p>Receivers used with the {@link Context} APIs are by their nature a
+ * cross-application facility, so you must consider how other applications
+ * may be able to abuse your use of them.  Some things to consider are:
+ *
+ * <ul>
+ * <li><p>The Intent namespace is global.  Make sure that Intent action names and
+ * other strings are written in a namespace you own, or else you may inadvertantly
+ * conflict with other applications.
+ * <li><p>When you use {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)},
+ * <em>any</em> application may send broadcasts to that registered receiver.  You can
+ * control who can send broadcasts to it through permissions described below.
+ * <li><p>When you publish a receiver in your application's manifest and specify
+ * intent-filters for it, any other application can send broadcasts to it regardless
+ * of the filters you specify.  To prevent others from sending to it, make it
+ * unavailable to them with <code>android:exported="false"</code>.
+ * <li><p>When you use {@link Context#sendBroadcast(Intent)} or related methods,
+ * normally any other application can receive these broadcasts.  You can control who
+ * can receive such broadcasts through permissions described below.  Alternatively,
+ * starting with {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH}, you
+ * can also safely restrict the broadcast to a single application with
+ * {@link Intent#setPackage(String) Intent.setPackage}
+ * </ul>
+ *
+ * <p>None of these issues exist when using
+ * {@link android.support.v4.content.LocalBroadcastManager}, since intents
+ * broadcast it never go outside of the current process.
+ *
  * <p>Access permissions can be enforced by either the sender or receiver
- * of an Intent.
- * 
+ * of a broadcast.
+ *
  * <p>To enforce a permission when sending, you supply a non-null
  * <var>permission</var> argument to
  * {@link Context#sendBroadcast(Intent, String)} or
@@ -133,7 +150,7 @@
  * {@link android.R.styleable#AndroidManifestUsesPermission &lt;uses-permission&gt;}
  * tag in their <code>AndroidManifest.xml</code>) will be able to receive
  * the broadcast.
- * 
+ *
  * <p>To enforce a permission when receiving, you supply a non-null
  * <var>permission</var> when registering your receiver -- either when calling
  * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter, String, android.os.Handler)}
@@ -144,10 +161,30 @@
  * {@link android.R.styleable#AndroidManifestUsesPermission &lt;uses-permission&gt;}
  * tag in their <code>AndroidManifest.xml</code>) will be able to send an
  * Intent to the receiver.
- * 
+ *
  * <p>See the <a href="{@docRoot}guide/topics/security/security.html">Security and Permissions</a>
  * document for more information on permissions and security in general.
+ *
+ * <a name="ReceiverLifecycle"></a>
+ * <h3>Receiver Lifecycle</h3>
+ * 
+ * <p>A BroadcastReceiver object is only valid for the duration of the call
+ * to {@link #onReceive}.  Once your code returns from this function,
+ * the system considers the object to be finished and no longer active.
+ * 
+ * <p>This has important repercussions to what you can do in an
+ * {@link #onReceive} implementation: anything that requires asynchronous
+ * operation is not available, because you will need to return from the
+ * function to handle the asynchronous operation, but at that point the
+ * BroadcastReceiver is no longer active and thus the system is free to kill
+ * its process before the asynchronous operation completes.
  * 
+ * <p>In particular, you may <i>not</i> show a dialog or bind to a service from
+ * within a BroadcastReceiver.  For the former, you should instead use the
+ * {@link android.app.NotificationManager} API.  For the latter, you can
+ * use {@link android.content.Context#startService Context.startService()} to
+ * send a command to the service.
+ *
  * <a name="ProcessLifecycle"></a>
  * <h3>Process Lifecycle</h3>
  * 

core/java/android/content/Loader.java

@@ -58,6 +58,13 @@ public class Loader<D> {
     boolean mReset = true;
     boolean mContentChanged = false;
 
+    /**
+     * An implementation of a ContentObserver that takes care of connecting
+     * it to the Loader to have the loader re-load its data when the observer
+     * is told it has changed.  You do not normally need to use this yourself;
+     * it is used for you by {@link CursorLoader} to take care of executing
+     * an update when the cursor's backing data changes.
+     */
     public final class ForceLoadContentObserver extends ContentObserver {
         public ForceLoadContentObserver() {
             super(new Handler());
@@ -74,6 +81,14 @@ public void onChange(boolean selfChange) {
         }
     }
 
+    /**
+     * Interface that is implemented to discover when a Loader has finished
+     * loading its data.  You do not normally need to implement this yourself;
+     * it is used in the implementation of {@link android.app.LoaderManager}
+     * to find out when a Loader it is managing has completed so that this can
+     * be reported to its client.  This interface should only be used if a
+     * Loader is not being used in conjunction with LoaderManager.
+     */
     public interface OnLoadCompleteListener<D> {
         /**
          * Called on the thread that created the Loader when the load is complete.