Update Android port

* INSTALL.android: Update.
* build-aux/ndk-build-helper-1.mk: Fix typo.
* configure.ac: Enable --with-json on Android.
* cross/ndk-build/ndk-build-shared-library.mk:
(NDK_CFLAGS_$(LOCAL_MODULE)):
(LOCAL_MODULE_FILENAME):
* cross/ndk-build/ndk-build-static-library.mk:
(ALL_OBJECT_FILES$(LOCAL_MODULE)):
(LOCAL_MODULE_FILENAME): Recursively resolve dependencies.
* cross/ndk-build/ndk-resolve.mk: New function.

* doc/emacs/android.texi (Android Startup): Document how Emacs
is dumped during initial startup.

* java/Makefile.in (filename): Fix build with multiple shared
libraries.
* java/README: Improve commentary.
* java/org/gnu/emacs/EmacsApplication.java (onCreate): Look and
set dump file.
* java/org/gnu/emacs/EmacsNative.java (EmacsNative): New
function getFingerprint.
* java/org/gnu/emacs/EmacsPreferencesActivity.java (onCreate):
Add option to erase the dump file.
* java/org/gnu/emacs/EmacsService.java (browseUrl): New
function.
* java/org/gnu/emacs/EmacsThread.java (run): Specify dump file
if found.
* lisp/loadup.el: Always dump during loadup on Android.

* lisp/net/browse-url.el (browse-url--browser-defcustom-type):
(browse-url-default-browser):
(browse-url-default-android-browser): New browse url type.

* m4/ndk-build.m4 (ndk_package_map): Map jansson to libjansson.
* src/android.c (struct android_emacs_service): New method
`browse_url'.
(getFingerprint): New function.
(android_init_emacs_service): Initialize new method.
(android_browse_url): New function.

* src/android.h: Update prototypes.

* src/androidselect.c (Fandroid_browse_url): New function.
(syms_of_androidselect): Define it.

* src/emacs.c (load_pdump): Don't look in fancy places on
Android.
* src/pdumper.c (Fdump_emacs_portable): Allow dumping while
interactive on Android.
(syms_of_pdumper): New variable `pdumper-fingerprint'.

* src/sfntfont-android.c (sfntfont_android_composite_bitmap):
Fix unused variables.

java/org/gnu/emacs/EmacsApplication.java

@@ -19,9 +19,59 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 package org.gnu.emacs;
 
-import android.app.Application;
+import java.io.File;
+import java.io.FileFilter;
 
-public class EmacsApplication extends Application
+import android.app.Application;
+import android.util.Log;
+
+public class EmacsApplication extends Application implements FileFilter
 {
-  /* This class currently does nothing.  */
+  private static final String TAG = "EmacsApplication";
+
+  /* The name of the dump file to use.  */
+  public static String dumpFileName;
+
+  @Override
+  public boolean
+  accept (File file)
+  {
+    return (!file.isDirectory ()
+	    && file.getName ().endsWith (".pdmp"));
+  }
+
+  @Override
+  public void
+  onCreate ()
+  {
+    File filesDirectory;
+    File[] allFiles;
+    String wantedDumpFile;
+    int i;
+
+    wantedDumpFile = ("emacs-" + EmacsNative.getFingerprint ()
+		      + ".pdmp");
+
+    Log.d (TAG, "onCreate: looking for " + wantedDumpFile);
+
+    /* Obtain a list of all files ending with ``.pdmp''.  Then, look
+       for a file named ``emacs-<fingerprint>.pdmp'' and delete the
+       rest.  */
+    filesDirectory = getFilesDir ();
+    allFiles = filesDirectory.listFiles (this);
+
+    /* Now try to find the right dump file.  */
+    for (i = 0; i < allFiles.length; ++i)
+      {
+	if (allFiles[i].getName ().equals (wantedDumpFile))
+	  dumpFileName = allFiles[i].getAbsolutePath ();
+	else
+	  /* Delete this outdated dump file.  */
+	  allFiles[i].delete ();
+      }
+
+    Log.d (TAG, "onCreate: found " + dumpFileName);
+
+    super.onCreate ();
+  }
 };

java/org/gnu/emacs/EmacsNative.java

@@ -25,6 +25,10 @@ import android.content.res.AssetManager;
 
 public class EmacsNative
 {
+  /* Obtain the fingerprint of this build of Emacs.  The fingerprint
+     can be used to determine the dump file name.  */
+  public static native String getFingerprint ();
+
   /* Set certain parameters before initializing Emacs.  This proves
      that libemacs.so is being loaded from Java code.
 

java/org/gnu/emacs/EmacsPreferencesActivity.java

@@ -19,6 +19,8 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 package org.gnu.emacs;
 
+import java.io.File;
+
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
@@ -93,6 +95,31 @@ public class EmacsPreferencesActivity extends Activity
       });
     layout.addView (textView);
 
+    textView = new TextView (this);
+    textView.setPadding (8, 20, 20, 8);
+
+    params = new LinearLayout.LayoutParams (LayoutParams.MATCH_PARENT,
+					    LayoutParams.WRAP_CONTENT);
+    textView.setLayoutParams (params);
+    textView.setText ("Erase dump file");
+    textView.setOnClickListener (new View.OnClickListener () {
+	@Override
+	public void
+	onClick (View view)
+	{
+	  String wantedDumpFile;
+	  File file;
+
+	  wantedDumpFile = ("emacs-" + EmacsNative.getFingerprint ()
+			    + ".pdmp");
+	  file = new File (getFilesDir (), wantedDumpFile);
+
+	  if (file.exists ())
+	    file.delete ();
+	}
+      });
+    layout.addView (textView);
+
     super.onCreate (savedInstanceState);
   }
 };

java/org/gnu/emacs/EmacsService.java

@@ -43,6 +43,8 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.res.AssetManager;
 
+import android.net.Uri;
+
 import android.os.Build;
 import android.os.Looper;
 import android.os.IBinder;
@@ -504,4 +506,27 @@ public class EmacsService extends Service
 						      EmacsService.class));
       }
   }
+
+  /* Ask the system to open the specified URL.
+     Value is NULL upon success, or a string describing the error
+     upon failure.  */
+
+  public String
+  browseUrl (String url)
+  {
+    Intent intent;
+
+    try
+      {
+	intent = new Intent (Intent.ACTION_VIEW, Uri.parse (url));
+	intent.setFlags (Intent.FLAG_ACTIVITY_NEW_TASK);
+	startActivity (intent);
+      }
+    catch (Exception e)
+      {
+	return e.toString ();
+      }
+
+    return null;
+  }
 };

java/org/gnu/emacs/EmacsThread.java

@@ -38,10 +38,23 @@ public class EmacsThread extends Thread
   {
     String args[];
 
-    if (!startDashQ)
-      args = new String[] { "libandroid-emacs.so", };
+    if (EmacsApplication.dumpFileName == null)
+      {
+	if (!startDashQ)
+	  args = new String[] { "libandroid-emacs.so", };
+	else
+	  args = new String[] { "libandroid-emacs.so", "-Q", };
+      }
     else
-      args = new String[] { "libandroid-emacs.so", "-Q", };
+      {
+	if (!startDashQ)
+	  args = new String[] { "libandroid-emacs.so", "--dump-file",
+	                        EmacsApplication.dumpFileName, };
+	else
+	  args = new String[] { "libandroid-emacs.so", "-Q",
+				"--dump-file",
+				EmacsApplication.dumpFileName, };
+      }
 
     /* Run the native code now.  */
     EmacsNative.initEmacs (args);