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  • How to create multiple view with drag and drop functionality in Android

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    This tutorial will help to the develop the Drag and Drop functionality, individual can create multiple view in their android application. Each view will have different onTouchListener and onLongClickListener.

    Step 1- Create a XML file res/activity_main.xml

    <Button
        android:id="@+id/button"
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:text="Button View" />
    
    <AbsoluteLayout
        android:id="@+id/boardLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/board"
        android:gravity="center"
        android:padding="20dp" >
    
    </AbsoluteLayout>
    

     

    Step-2 Create a Activity called src/MainActivity

    import android.app.Activity;
    import android.content.ClipData;
    import android.os.Bundle;
    import android.view.DragEvent;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.View.OnLongClickListener;
    import android.view.ViewGroup;
    import android.view.ViewGroup.LayoutParams;
    import android.widget.AbsoluteLayout;
    import android.widget.Button;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;
    
    
    public class DragDrop extends Activity implements OnLongClickListener,
    View.OnDragListener,OnClickListener{
    
        private RelativeLayout relativeLayoutrectangleView;
        private ImageView rectangleView;
        private String IMAGE_RECTANGLE = "RECTANGLE";
        float X,Y;
        boolean temp;
        private AbsoluteLayout absoluteLayout, boardLayout,containView;
        private Button button;
        private int heightlayout,widthlayout;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            boardLayout=(AbsoluteLayout)findViewById(R.id.boardLayout);
            boardLayout.setOnDragListener(this);
    
            button=(Button)findViewById(R.id.button);
            button.setOnClickListener(this);
        }
    
    // Override onDrag() method called when start to drag a view with some different event 
    
    
    
     @Override
            public boolean onDrag(View v, DragEvent event) {
    
                // Defines a variable to store the action type for the incoming
                // event
                final int action = event.getAction();
    
                // Handles each of the expected events
                switch (action) {
    
                case DragEvent.ACTION_DRAG_STARTED:
    
                    // Invalidate the view to force a redraw in the new tint
                    v.invalidate();
    
                    // returns true to indicate that the View can accept the
                    // dragged data.
                    return true;
    
                case DragEvent.ACTION_DRAG_ENTERED:
    
                    // Invalidate the view to force a redraw in the new tint
                    v.invalidate();
    
                    return false;
    
                case DragEvent.ACTION_DRAG_LOCATION:
    
                    X = event.getX();
                    Y = event.getY();
    
                    if(X>widthlayout && Y>heightlayout){
                        temp = true;
                    }
                    // Ignore the event
                    return false;
    
                case DragEvent.ACTION_DRAG_EXITED:
    
    
                    //v.invalidate();
    
                    return false;
    
                case DragEvent.ACTION_DROP:
    
                    // Gets the item containing the dragged data
                    ClipData dragData = event.getClipData();
    
                    // Gets the text data from the item.
                    final String tag = dragData.getItemAt(0).getText().toString();
                    View view = (View) event.getLocalState();
                    ViewGroup viewgroup = (ViewGroup) view.getParent();
                    viewgroup.removeView(view);
    
                    X = event.getX();
                    Y = event.getY();
                    view.setX(X-(view.getWidth()/2));
                    view.setY(Y-(view.getHeight()/2));
                    containView = (AbsoluteLayout) v;
                    containView.addView(view);
    
                    view.setVisibility(View.VISIBLE);
                    // Invalidates the view to force a redraw
                    v.invalidate();
    
                    // Returns true. DragEvent.getResult() will return true.
                    return true;
    
    
                case DragEvent.ACTION_DRAG_ENDED:
    
                    v.invalidate();
    
    
                    return false;
    
                default:
                    break;
                }
    
                return false;
            }
    

    // Override onLongClick() method used to create a shadow of view when a start drag .

    @Override
        public boolean onLongClick(View v) {
            String tag = v.getTag().toString();
            ClipData dragData = ClipData.newPlainText("TAG", tag);
    
            // Instantiates the drag shadow builder.
            View.DragShadowBuilder myShadow = null;
            //v.setBackgroundResource(0);
    
    
    
            if(tag.equals(IMAGE_RECTANGLE)){
                v.setVisibility(View.INVISIBLE);
    
                myShadow = new View.DragShadowBuilder(relativeLayoutrectangleView);
            }
            // Starts the drag
            v.startDrag(dragData, myShadow, v, 0);
            return false;
    
        }
    

    // this method will call when press button to create a new view each time press this button.

    @Override
        public void onClick(View v) {
    
            createCustomView();
    
        }
    
    
    private void createCustomView() {
            absoluteLayout=new AbsoluteLayout(this);
            absoluteLayout.setLayoutParams(new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            relativeLayoutrectangleView = new RelativeLayout(this); 
            relativeLayoutrectangleView.setLayoutParams(new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    
            relativeLayoutrectangleView.getLayoutParams().height=100;
            relativeLayoutrectangleView.getLayoutParams().width=100;
    
            rectangleView=new ImageView(this);
            rectangleView.setLayoutParams(new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            relativeLayoutrectangleView.setTag(IMAGE_RECTANGLE);
            rectangleView.getLayoutParams().height=300;
            rectangleView.getLayoutParams().width=300;
            rectangleView.setImageResource((R.drawable.rectangle));
            relativeLayoutrectangleView.setOnLongClickListener(this);
            relativeLayoutrectangleView.setBackgroundResource(R.drawable.rectangle);
            ViewGroup.LayoutParams la_pm = rectangleView.getLayoutParams();
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(la_pm);
            //relativeLayoutrectangleView.addView(rectangleView,lp);  
    
            absoluteLayout.addView(relativeLayoutrectangleView);
            boardLayout.addView(absoluteLayout);
    
    
    
    
        }
    
    
    
        @Override
        public void onWindowFocusChanged(boolean hasFocus){
            widthlayout=boardLayout.getWidth();
            heightlayout=boardLayout.getHeight();
        }
    
    }
    

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