DraggableTreeView is a custom view that mimics a Tree View directory and also implements drag and drop. The tree view can go to the n-th level by default there is no limit.
Add this to your build.gradle file for your app.
allprojects { repositories { ... maven { url 'https://jitpack.io' } } }Add this to your dependencies in build.gradle for your project.
dependencies { compile 'com.github.jakebonk:DraggableTreeView:1.0.1' }DraggableTreeView is organized by a custom adapter called TreeViewAdapter, I included a Simple implementation of the adapter class called SimpleTreeViewAdapter.
DraggableTreeView draggableTreeView = (DraggableTreeView)findViewById(R.id.dtv); TreeNode root = new TreeNode(this); TreeNode item = new TreeNode("Item 1"); TreeNode item2 = new TreeNode("Item 2"); TreeNode subitem = new TreeNode("Sub Item 2"); subitem.addChild(new TreeNode("Sub Sub Item 1")); item.addChild(subitem); item.addChild(new TreeNode("Sub Item 1")); root.addChild(new TreeNode("Item 3")); root.addChild(new TreeNode("Item 4")); root.addChild(new TreeNode("Item 5")); root.addChild(new TreeNode("Item 6")); root.addChild(new TreeNode("Item 7")); root.addChild(new TreeNode("Item 8")); root.addChild(new TreeNode("Item 9")); root.addChild(new TreeNode("Item 10")); root.addChild(new TreeNode("Item 11")); root.addChild(new TreeNode("Item 12")); root.addChild(item2); root.addChild(item); SimpleTreeViewAdapter adapter = new SimpleTreeViewAdapter(this,root); draggableTreeView.setAdapter(adapter);You can also change both the succesful placeholder as well as the bad placeholder by passing a view through the function
adapter.setBadPlaceholder(view);or
adapter.setPlaceholder(view); By assigning the variable maxLevel a value you can define how many levels the tree view can drag to.
draggableTreeView.maxLevels = 4; There are three call back functions that can be used, onStartDrag, onChangedPosition, and onEndDrag to use it simply call setOnDragItemListener
Example:
draggableTreeView.setOnDragItemListener(new DraggableTreeView.DragItemCallback() { @Override public void onStartDrag(View item, TreeNode node) { Log.e("start",(String)node.getData()); } @Override public void onChangedPosition(View item, TreeNode child, TreeNode parent, int position) { Log.e("changed",(String)parent.getData()+" > "+(String)child.getData()+":"+String.valueOf(position)); } @Override public void onEndDrag(View item, TreeNode child, TreeNode parent, int position) { Log.e("end",(String)parent.getData()+" > "+(String)child.getData()+":"+String.valueOf(position)); } });