Add missing file from the file chooser work

src/com/fsck/k9/helper/FileBrowserHelper.java

@@ -0,0 +1,116 @@
+package com.fsck.k9.helper;
+
+import java.io.File;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.ActivityNotFoundException;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.text.InputType;
+import android.widget.EditText;
+
+import com.fsck.k9.K9;
+import com.fsck.k9.R;
+
+public class FileBrowserHelper {
+    private static FileBrowserHelper sInstance;
+
+    /**
+     * callback class to provide the result of the fallback textedit path dialog
+     */
+    public interface FileBrowserFailOverCallback {
+        /**
+         * the user has entered a path
+         * @param path the path as String
+         */
+        public void onPathEntered(String path);
+        /**
+         * the user has cancel the inputtext dialog
+         */
+        public void onCancel();
+    }
+    /**
+     * factory method
+     *
+     */
+    private FileBrowserHelper() {
+    }
+    public synchronized static FileBrowserHelper getInstance() {
+        if (sInstance == null) {
+            sInstance = new FileBrowserHelper();
+        }
+        return sInstance;
+    }
+
+
+    /**
+     * tries to open known filebrowsers.
+     * If no filebrowser is found and fallback textdialog is shown
+     * @param c the context as activty
+     * @param startPath: the default value, where the filebrowser will start.
+     *      if startPath = null => the default path is used
+     * @param requestcode: the int you will get as requestcode in onActivityResult
+     *      (only used if there is a filebrowser installed)
+     * @param callback: the callback (only used when no filebrowser is installed.
+     *      if a filebrowser is installed => override the onActivtyResult Method
+     *
+     * @return true: if a filebrowser has been found (the result will be in the onActivityResult
+     *          false: a fallback textinput has been shown. The Result will be sent with the callback method
+     *
+     *
+     */
+    public boolean showFileBrowserActivity(Activity c, File startPath, int requestcode, FileBrowserFailOverCallback callback) {
+        boolean success = false;
+        Intent intent = new Intent("org.openintents.action.PICK_DIRECTORY");
+        if (startPath == null)
+            startPath = new File(K9.getAttachmentDefaultPath());
+        if (startPath != null)
+            intent.setData(Uri.fromFile(startPath));
+
+        try {
+            c.startActivityForResult(intent, requestcode);
+            success = true;
+        } catch (ActivityNotFoundException e) {
+            try {
+                intent = new Intent("com.androidworkz.action.PICK_DIRECTORY");
+                c.startActivityForResult(intent, requestcode);
+                success = true;
+            } catch (ActivityNotFoundException ee) {
+                //No Filebrowser is installed => show an fallback textdialog
+                showPathTextInput(c, startPath, callback);
+                return false;
+            }
+        }
+        return success;
+    }
+
+    private void showPathTextInput(final Activity c, final File startPath, final FileBrowserFailOverCallback callback) {
+        AlertDialog.Builder alert = new AlertDialog.Builder(c);
+
+        alert.setTitle(c.getString(R.string.attachment_save_title));
+        alert.setMessage(c.getString(R.string.attachment_save_desc));
+        final EditText input = new EditText(c);
+        input.setInputType(InputType.TYPE_CLASS_TEXT);
+        if (startPath != null)
+            input.setText(startPath.toString());
+        alert.setView(input);
+
+        alert.setPositiveButton(c.getString(R.string.okay_action), new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int whichButton) {
+                String path = input.getText().toString();
+                callback.onPathEntered(path);
+            }
+        });
+
+        alert.setNegativeButton(c.getString(R.string.cancel_action),
+        new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int whichButton) {
+                callback.onCancel();
+            }
+        });
+
+        alert.show();
+    }
+}