https://github.com/jakebonk/draggabletreeview
TreeView with drag and drop (n-th level)
https://github.com/jakebonk/draggabletreeview
android custom-view drag-and-drop java nestedscrollview tree-view
Last synced: 5 months ago
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TreeView with drag and drop (n-th level)
- Host: GitHub
- URL: https://github.com/jakebonk/draggabletreeview
- Owner: jakebonk
- License: mit
- Created: 2017-06-21T05:23:10.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2017-06-26T19:05:00.000Z (over 8 years ago)
- Last Synced: 2025-08-01T07:56:10.911Z (6 months ago)
- Topics: android, custom-view, drag-and-drop, java, nestedscrollview, tree-view
- Language: Java
- Homepage:
- Size: 115 KB
- Stars: 102
- Watchers: 6
- Forks: 16
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
Awesome Lists containing this project
README
[](https://jitpack.io/#jakebonk/DraggableTreeView)
# 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.
```java
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
```
Add this to your dependencies in build.gradle for your project.
```java
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.
```java
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
```java
adapter.setBadPlaceholder(view);
```
or
```java
adapter.setPlaceholder(view);
```
By assigning the variable maxLevel a value you can define how many levels the tree view can drag to.
```java
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:
```java
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));
}
});
```