Drag and drop using DragLinearLayout in android with example

What is DragLinearLayout in Android ? 

DragLinearLayout is a custom layout for Android that allows users to drag and drop views within the layout. It is an open-source library available on GitHub and can be easily added to any project. It extends the standard LinearLayout and adds drag functionality to it. It is useful when you need to create a UI where users can rearrange the order of views within a layout by dragging and dropping them. It provides an easy-to-use API with methods to enable or disable the drag functionality, set the drag threshold, and customize the animation when the view is dragged.

To use DragLinearLayout in android, follow these steps:

1. Add the DragLinearLayout library to your project by adding the following dependency to your build.gradle file:

implementation 'com.github.vipulasri:DraggableLinearLayout:1.0.2'

2. In your layout XML file, replace the LinearLayout element with DragLinearLayout. For example, if you have a LinearLayout with the id 'container', replace it with:

<com.vipulasri.draggablelinearlayout.DraggableLinearLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- your child views here -->

</com.vipulasri.draggablelinearlayout.DraggableLinearLayout>

3. In your activity or fragment, initialize the DragLinearLayout and set the drag listener:

DraggableLinearLayout dragLinearLayout = findViewById(R.id.container);
dragLinearLayout.setOnDragListener(new DraggableLinearLayout.OnDragListener() {
    @Override
    public void onDrag(View view) {
        // Handle drag event here
    }
});

4. To enable or disable the drag functionality, you can use the setDraggable() method:

dragLinearLayout.setDraggable(false); // disable drag
dragLinearLayout.setDraggable(true); // enable drag

5. You can also set the drag threshold by using the setDragThreshold() method. This is the minimum distance the user must drag before the drag event is triggered:

dragLinearLayout.setDragThreshold(50); // drag threshold of 50 pixels

6. To customize the animation when the view is dragged, you can set the animation interpolator using the setAnimationInterpolator() method:

dragLinearLayout.setAnimationInterpolator(new DecelerateInterpolator());

That's it! You can now drag and drop views within the DragLinearLayout and handle the drag event as per your requirements