Add VPN settings classes to Settings app.

PATCH SET 2:
+ Add import com.android.settings.R

PATCH SET 3:
+ Remove @Override interface methods to be compilable by Java 1.5.

PATCH SET 4:
+ Add import android.net.vpn.VpnManager

PATCH SET 5:
+ Add license headers.

PATCH SET 6:
+ Remove Constant.java and move the constants to VpnSettings.
+ Make AuthenticationActor implement DialogInterface's handlers.
+ Remove trailing spaces.

PATCH SET 7:
+ Remove default username.

src/com/android/settings/vpn/Util.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.vpn;
+
+import com.android.settings.R;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.widget.Toast;
+
+import org.apache.commons.codec.binary.Base64;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+class Util {
+
+    static void showShortToastMessage(Context context, String message) {
+        Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
+    }
+
+    static void showShortToastMessage(Context context, int messageId) {
+        Toast.makeText(context, messageId, Toast.LENGTH_SHORT).show();
+    }
+
+    static void showLongToastMessage(Context context, String message) {
+        Toast.makeText(context, message, Toast.LENGTH_LONG).show();
+    }
+
+    static void showLongToastMessage(Context context, int messageId) {
+        Toast.makeText(context, messageId, Toast.LENGTH_LONG).show();
+    }
+
+    static void showErrorMessage(Context c, String message) {
+        createErrorDialog(c, message, null).show();
+    }
+
+    static void showErrorMessage(Context c, String message,
+            DialogInterface.OnClickListener listener) {
+        createErrorDialog(c, message, listener).show();
+    }
+
+    static boolean isNullOrEmpty(String message) {
+        return ((message == null) || (message.length() == 0));
+    }
+
+    static String base64Encode(byte[] bytes) {
+        return new String(Base64.encodeBase64(bytes));
+    }
+
+    static void deleteFile(String path) {
+        deleteFile(new File(path));
+    }
+
+    static void deleteFile(String path, boolean toDeleteSelf) {
+        deleteFile(new File(path), toDeleteSelf);
+    }
+
+    static void deleteFile(File f) {
+        deleteFile(f, true);
+    }
+
+    static void deleteFile(File f, boolean toDeleteSelf) {
+        if (f.isDirectory()) {
+            for (File child : f.listFiles()) deleteFile(child, true);
+        }
+        if (toDeleteSelf) f.delete();
+    }
+
+    static boolean isFileOrEmptyDirectory(String path) {
+        File f = new File(path);
+        if (!f.isDirectory()) return true;
+
+        String[] list = f.list();
+        return ((list == null) || (list.length == 0));
+    }
+
+    static boolean copyFiles(String sourcePath , String targetPath)
+            throws IOException {
+        return copyFiles(new File(sourcePath), new File(targetPath));
+    }
+
+    // returns false if sourceLocation is the same as the targetLocation
+    static boolean copyFiles(File sourceLocation , File targetLocation)
+            throws IOException {
+        if (sourceLocation.equals(targetLocation)) return false;
+
+        if (sourceLocation.isDirectory()) {
+            if (!targetLocation.exists()) {
+                targetLocation.mkdir();
+            }
+            String[] children = sourceLocation.list();
+            for (int i=0; i<children.length; i++) {
+                copyFiles(new File(sourceLocation, children[i]),
+                        new File(targetLocation, children[i]));
+            }
+        } else if (sourceLocation.exists()) {
+            InputStream in = new FileInputStream(sourceLocation);
+            OutputStream out = new FileOutputStream(targetLocation);
+
+            // Copy the bits from instream to outstream
+            byte[] buf = new byte[1024];
+            int len;
+            while ((len = in.read(buf)) > 0) {
+                out.write(buf, 0, len);
+            }
+            in.close();
+            out.close();
+        }
+        return true;
+    }
+
+    private static AlertDialog createErrorDialog(Context c, String message,
+            DialogInterface.OnClickListener okListener) {
+        AlertDialog.Builder b = new AlertDialog.Builder(c)
+                .setTitle(R.string.vpn_error_title)
+                .setMessage(message);
+        if (okListener != null) {
+            b.setPositiveButton(R.string.vpn_back_button, okListener);
+        } else {
+            b.setPositiveButton(android.R.string.ok, null);
+        }
+        return b.create();
+    }
+
+    private Util() {
+    }
+}