DraggableTreeView
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.
Example
Download library with Jitpack.io
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'
}
Usage
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;
Callback functions
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));
}
}
);