创建imageview android的副本/克隆

问题描述

我正在创建拖放主布局上的对象的拖放应用程序。我的问题是我想要有图像视图的无限/无限副本，所以我可以尽可能多地拖动图像。

I am creating a drag and drop application that drags an object on the main layout. My problem is I want to have unlimited/infinity copy of the image view so I can drag the image as many as I can.

例如心形，当我已经拖动图像我不能有另一个心脏的形状，因为我只有一个图像（心脏）在布局。

For example the heart shape, when I already drag the image I cannot have another heart shape because I only have one image(heart) in the layout.

这是我在imageViews（Star，Heart，lightning）上的触摸代码：

This is my code on touch on imageViews (Star, Heart, lightning):

private final class MyTouchListener implements OnTouchListener {

    public boolean onTouch(View view, MotionEvent motionEvent) {
        if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
          ClipData data = ClipData.newPlainText("", "");
          DragShadowBuilder shadowBuilder = new DragShadowBuilder(view);
          view.startDrag(data, shadowBuilder, view, 0);
          view.setVisibility(View.INVISIBLE);
          return true;
        } else {
        return false;
        }
      }

    }

我的拖放监听器的下拉区域/主图像：

this is my drag listener of the drop zone/main image:

class MyDragListener implements OnDragListener {
    @Override
      public boolean onDrag(View v, DragEvent event) {
        int action = event.getAction();
        final int X = (int) event.getX();
        final int Y = (int) event.getY();

        switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
        // do nothing
          break;
        case DragEvent.ACTION_DRAG_ENTERED:
          break;
        case DragEvent.ACTION_DRAG_EXITED:
          break;
        case DragEvent.ACTION_DROP:
          // Dropped, reassign View to ViewGroup
          View view = (View) event.getLocalState();
          ViewGroup owner = (ViewGroup) view.getParent();
          owner.removeView(view);
          RelativeLayout container = (RelativeLayout) v;

          RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(30, 30);
           params1.leftMargin = (int) event.getX() - 15;
           params1.topMargin = (int) event.getY() -15;

          container.addView(view,params1);
          view.setVisibility(View.VISIBLE);
          break;
        case DragEvent.ACTION_DRAG_ENDED:
          default:
          break;
        }
        return true;
      }
  }

推荐答案

您可以使用画布轻松开发您的案例。

Drag and drop in your case is much easier to develop with canvas.

创建一个扩展View的类，使一个rect来绘制图像，setOntouch在该视图中，让直接跟随您的触摸，并使用invalidate（）强制重新绘制视图。

Create a class that extends View, make a rect to draw you image inside, setOntouch on that view, let rect follow your touch, and use invalidate() to force redraw the view.

编辑
使用画布时，不要从边缘和布局参数头痛，这只是简单的。

EditWhen using canvas you don't get headache from margins and layout parameters, it's just straightforward.

DragDropView.java

DragDropView.java

public class DragDropView extends View implements OnTouchListener  {
    Rect originalRect , draggableRect;
    int left, right, top, bottom, newX, newY, size;
    Drawable originalDrawable,draggableDrawable;

    public DragDropView(Context context)
    {
        super(context, null);
        size = 20;
        originalRect= new Rect();
        originalRect.set(200, 200, 240, 240); //left , top , right , bottom
        draggableRect= new Rect();
        draggableRect.set(200, 200, 240, 240);
        originalDrawable = getResources().getDrawable(R.drawable.ic_launcher);
        draggableDrawable = getResources().getDrawable(R.drawable.ic_launcher);
        originalDrawable.setBounds(originalRect); // since it wont move no need to do that in onDraw()
        newX = 220;
        newY=220;
        this.setOnTouchListener(this);
    }
    public DragDropView(Context context, AttributeSet attrs)
    {    super(context, attrs);    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        originalDrawable.draw(canvas);
        draggableRect.set(newX-size, newY-size, newX+size, newY+size);
        draggableDrawable.setBounds(draggableRect);
        draggableDrawable.draw(canvas);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event)
    {
        newX = (int)event.getX();
        newY = (int)event.getY();
        invalidate(); // force redraw

        //if you need special touch events
//      //on touch down
//      if( event.getAction() == MotionEvent.ACTION_DOWN )
//      {   }
//      //on touch move
//      if( event.getAction() == MotionEvent.ACTION_MOVE )
//      {   }
//      //on touch up
//      if( event.getAction() == MotionEvent.ACTION_UP )
//      {   }

        return true; // always return true to let touch listener listen to next touch
    }
}

YourActivity.java

YourActivity.java

DragDropView dragDropView = new DragDropView();

这篇关于创建imageview android的副本/克隆的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！