Android compatibility fixes

* doc/emacs/android.texi (Android Windowing): Document
restrictions on number of windows under Android 4.4 and earlier.

* java/AndroidManifest.xml.in <EmacsActivity>
<EmacsOpenActivity, EmacsMultitaskActivity>: Assign each class
of activity a unique task affinity.

* java/org/gnu/emacs/EmacsDesktopNotification.java (display1):
Remove redundant priority assignment.

* java/org/gnu/emacs/EmacsOpenActivity.java (onCreate): Handle
file URIs when processing attachments from a mailto URI, and
check for KitKat before opening content ones.

* java/org/gnu/emacs/EmacsWindow.java <pointerMap>
(figureChange): Replace coordinate HashMap with a SparseArray.

* java/org/gnu/emacs/EmacsWindowAttachmentManager.java
(registerWindow): Don't specify FLAG_ACTIVITY_NEW_DOCUMENT on
systems where it is absent.

1 files changed, 3 insertions, 1 deletions

diff --git a/java/AndroidManifest.xml.in b/java/AndroidManifest.xml.in
index 4d23c752747..563914fb02c 100644
--- a/java/AndroidManifest.xml.in
+++ b/java/AndroidManifest.xml.in
@@ -218,6 +218,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>. -->
 
     <activity android:name="org.gnu.emacs.EmacsActivity"
               android:launchMode="singleInstance"
+              android:taskAffinity="emacs.primary_frame"
               android:windowSoftInputMode="adjustResize"
               android:exported="true"
               android:configChanges="orientation|screenSize|screenLayout|keyboardHidden|locale|fontScale">
@@ -229,7 +230,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>. -->
     </activity>
 
     <activity android:name="org.gnu.emacs.EmacsOpenActivity"
-              android:taskAffinity="open.dialog"
+              android:taskAffinity="emacs.open_dialog"
               android:excludeFromRecents="true"
               android:exported="true">
 
@@ -273,6 +274,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>. -->
     </activity>
 
     <activity android:name="org.gnu.emacs.EmacsMultitaskActivity"
+              android:taskAffinity="emacs.secondary_frame"
               android:windowSoftInputMode="adjustResize"
               android:exported="true"
               android:configChanges="orientation|screenSize|screenLayout|keyboardHidden|locale|fontScale"/>