put directories and files in the same list + permission handling

app/src/main/java/com/simplemobiletools/filemanager/models/FileDirItem.java

@@ -0,0 +1,45 @@
+package com.simplemobiletools.filemanager.models;
+
+public class FileDirItem implements Comparable {
+    private final String mPath;
+    private final String mName;
+    private final boolean mIsDirectory;
+
+    public FileDirItem(String path, String name, boolean isDirectory) {
+        mPath = path;
+        mName = name;
+        mIsDirectory = isDirectory;
+    }
+
+    public String getPath() {
+        return mPath;
+    }
+
+    public String getName() {
+        return mName;
+    }
+
+    public boolean getIsDirectory() {
+        return mIsDirectory;
+    }
+
+    @Override
+    public int compareTo(Object object) {
+        final FileDirItem item = (FileDirItem) object;
+        if (mIsDirectory && !item.getIsDirectory()) {
+            return -1;
+        } else if (!mIsDirectory && item.getIsDirectory()) {
+            return 1;
+        }
+
+        return mName.compareToIgnoreCase(item.getName());
+    }
+
+    @Override
+    public String toString() {
+        return "FileDirItem {" +
+                "name=" + getName() +
+                ", isDirectory=" + getIsDirectory() +
+                ", path=" + getPath() + "}";
+    }
+}