move the SelectFolder dialog handling in a separate file

app/src/main/java/com/simplemobiletools/filemanager/dialogs/SelectFolderDialog.java

@@ -0,0 +1,136 @@
+package com.simplemobiletools.filemanager.dialogs;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.app.AlertDialog;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ListView;
+
+import com.simplemobiletools.filemanager.Breadcrumbs;
+import com.simplemobiletools.filemanager.R;
+import com.simplemobiletools.filemanager.Utils;
+import com.simplemobiletools.filemanager.adapters.ItemsAdapter;
+import com.simplemobiletools.filemanager.fragments.ItemsFragment;
+import com.simplemobiletools.filemanager.models.FileDirItem;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class SelectFolderDialog extends DialogFragment {
+    private static String mPath;
+    private static ListView mListView;
+    private static Breadcrumbs mBreadcrumbs;
+
+    public static SelectFolderDialog newInstance(String path) {
+        mPath = path;
+        return new SelectFolderDialog();
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View view = getActivity().getLayoutInflater().inflate(R.layout.directory_picker, null);
+        mListView = (ListView) view.findViewById(R.id.directory_picker_list);
+        mBreadcrumbs = (Breadcrumbs) view.findViewById(R.id.directory_picker_breadcrumbs);
+
+        updateItems();
+        setupBreadcrumbs();
+
+        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        builder.setTitle(getResources().getString(R.string.select_destination));
+        builder.setView(view);
+        builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                sendResult();
+            }
+        });
+        builder.setNegativeButton(R.string.cancel, null);
+
+        return builder.create();
+    }
+
+    private void updateItems() {
+        final List<FileDirItem> items = getItems(mPath);
+        if (!containsDirectory(items)) {
+            sendResult();
+            return;
+        }
+
+        Collections.sort(items);
+        final ItemsAdapter adapter = new ItemsAdapter(getContext(), items);
+        mListView.setAdapter(adapter);
+
+        mBreadcrumbs.setInitialBreadcrumb(mPath);
+        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+                final FileDirItem item = items.get(position);
+                if (item.getIsDirectory()) {
+                    mPath = item.getPath();
+                    updateItems();
+                }
+            }
+        });
+    }
+
+    private void sendResult() {
+        Intent intent = new Intent();
+        intent.putExtra(ItemsFragment.SELECT_FOLDER_PATH, mPath);
+        getTargetFragment().onActivityResult(ItemsFragment.SELECT_FOLDER_REQUEST, Activity.RESULT_OK, intent);
+        dismiss();
+    }
+
+    private void setupBreadcrumbs() {
+        mBreadcrumbs.setListener(new Breadcrumbs.BreadcrumbsListener() {
+            @Override
+            public void breadcrumbClicked(int id) {
+                final FileDirItem item = (FileDirItem) mBreadcrumbs.getChildAt(id).getTag();
+                mPath = item.getPath();
+                updateItems();
+            }
+        });
+    }
+
+    private List<FileDirItem> getItems(String path) {
+        final List<FileDirItem> items = new ArrayList<>();
+        final File base = new File(path);
+        File[] files = base.listFiles();
+        if (files != null) {
+            for (File file : files) {
+                if (!file.isDirectory())
+                    continue;
+
+                final String curPath = file.getAbsolutePath();
+                final String curName = Utils.getFilename(curPath);
+                int children = getChildren(file);
+                long size = file.length();
+
+                items.add(new FileDirItem(curPath, curName, file.isDirectory(), children, size));
+            }
+        }
+        return items;
+    }
+
+    private int getChildren(File file) {
+        if (file.listFiles() == null || !file.isDirectory())
+            return 0;
+
+        return file.listFiles().length;
+    }
+
+    private boolean containsDirectory(List<FileDirItem> items) {
+        for (FileDirItem item : items) {
+            if (item.getIsDirectory()) {
+                return true;
+            }
+        }
+        return false;
+    }
+}