android - 如何在 Android 的阴影框中显示文本项？

Question

当我拖动项目时，我想用另一个词在阴影部分显示文本我想在阴影部分显示项目文本（当用户长按并想放到另一个地方时）！在 startdrag 中，当我调用 myshadow 时，我有数据和项目文本，我无法在阴影框中设置文本（颜色为黄色）。

OnItemLongClickListener listSourceItemLongClickListener = new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> l, View v, int position,
        long id) {

    // Selected item is passed as item in dragData
    ClipData.Item item = new ClipData.Item(lv_arr[position]);

    String[] clipDescription = { ClipDescription.MIMETYPE_TEXT_PLAIN };
    ClipData dragData = new ClipData((CharSequence) v.getTag(),
            clipDescription, item);
    DragShadowBuilder myShadow = new MyDragShadowBuilder(v);

    v.startDrag(dragData, // ClipData
            myShadow, // View.DragShadowBuilder
            lv_arr[position], // Object myLocalState
            0); // flags

    // commentMsg = v.getTag() + " : onLongClick.\n";
    // comments.setText(commentMsg);

    return true;
}
}
private static class MyDragShadowBuilder extends View.DragShadowBuilder{
  private static Drawable shadow;

public MyDragShadowBuilder(View v) {
    super(v);
    shadow = new ColorDrawable(Color.LTGRAY);
}

@Override
public void onProvideShadowMetrics(Point size, Point touch) {
    int width = getView().getWidth();
    int height = getView().getHeight();

    shadow.setBounds(0, 0, width, height);
    size.set(width, height);
    touch.set(width / 2, height / 2);
}


@Override
public void onDrawShadow(Canvas canvas) {
    shadow.draw(canvas);
}
}

Answer 1

我相信你可以覆盖onDrawShadow(Canvas canvas)（你实际上已经覆盖）并使用画布对象引用来调用drawText传递你想要在那里的文本的方法。

试试看。

Answer 2

是的，谢谢 我刚刚补充说，这对我有用！

    @Override
    public void onDrawShadow(Canvas canvas) {

        shadow.draw(canvas);
        super.onDrawShadow(canvas);

    }