【Android】HorizontalScrollView內子控件橫向拖拽

本文轉載自查看原文 2014-03-13 21:19 12229 4、Android/ android HorizontalScrollView drag/ android DragShadowBuilder

前言

網上ListView上下拖動的例子有，效果也很好，但是項目要橫着拖的，只要硬着頭皮自己寫（主要是沒找到合適的），參考文章1修改而來，分享一下。

聲明

歡迎轉載，但請保留文章原始出處:)
博客園：http://www.cnblogs.com

農民伯伯： http://over140.cnblogs.com

正文

截圖

代碼

java

public class HoDragActivity extends Activity {

     private LinearLayout main;

     private GestureDetector mGestureDetector;

    @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        setContentView(R.layout.main_cc);

        main = (LinearLayout) findViewById(R.id.main);

        bindDrapListener(R.id.myimage1);
        bindDrapListener(R.id.myimage2);
        bindDrapListener(R.id.myimage3);
        bindDrapListener(R.id.myimage4);
        bindDrapListener(R.id.myimage5);
        bindDrapListener(R.id.myimage6);
        bindDrapListener(R.id.myimage7);
        bindDrapListener(R.id.myimage8);
        bindDrapListener(R.id.myimage9);
        bindDrapListener(R.id.myimage10);
        bindDrapListener(R.id.myimage11);
        bindDrapListener(R.id.myimage12);

        mGestureDetector = new GestureDetector( this, new DrapGestureListener());
    }

     private View mDrapView;

     private void bindDrapListener( int id) {
        View v = findViewById(id);
        v.setOnTouchListener(mOnTouchListener);
        v.setOnDragListener(mOnDragListener);
    }

     private OnTouchListener mOnTouchListener = new OnTouchListener() {

        @Override
         public boolean onTouch(View v, MotionEvent event) {
            mDrapView = v;

             if (mGestureDetector.onTouchEvent(event))
                 return true;

             switch (event.getAction() & MotionEvent.ACTION_MASK) {
             case MotionEvent.ACTION_UP:

                 break;
            }

             return false;
        }
    };

     private OnDragListener mOnDragListener = new OnDragListener() {

        @Override
         public boolean onDrag(View v, DragEvent event) {
             switch (event.getAction()) {
             case DragEvent.ACTION_DRAG_STARTED:
                 // Do nothing
                 break;
             case DragEvent.ACTION_DRAG_ENTERED:
                v.setAlpha(0.5F);
                 break;
             case DragEvent.ACTION_DRAG_EXITED:
                v.setAlpha(1F);
                 break;
             case DragEvent.ACTION_DROP:
                View view = (View) event.getLocalState();
                 for ( int i = 0, j = main.getChildCount(); i < j; i++) {
                     if (main.getChildAt(i) == v) {
                         // 當前位置
                        main.removeView(view);
                        main.addView(view, i);
                         break;
                    }
                }
                 break;
             case DragEvent.ACTION_DRAG_ENDED:
                v.setAlpha(1F);
             default:
                 break;
            }
             return true;
        }
    };

     private class DrapGestureListener extends SimpleOnGestureListener {
        @Override
         public boolean onSingleTapConfirmed(MotionEvent e) {
             return super.onSingleTapConfirmed(e);
        }

        @Override
         public void onLongPress(MotionEvent e) {
             super.onLongPress(e);
            ClipData data = ClipData.newPlainText("", "");
            MyDragShadowBuilder shadowBuilder = new MyDragShadowBuilder(
                    mDrapView);
            mDrapView.startDrag(data, shadowBuilder, mDrapView, 0);
        }

        @Override
         public boolean onDown(MotionEvent e) {
             return true;
        }
    }

     private class MyDragShadowBuilder extends View.DragShadowBuilder {

         private final WeakReference<View> mView;

         public MyDragShadowBuilder(View view) {
             super(view);
            mView = new WeakReference<View>(view);
        }

        @Override
         public void onDrawShadow(Canvas canvas) {
            canvas.scale(1.5F, 1.5F);
             super.onDrawShadow(canvas);
        }

        @Override
         public void onProvideShadowMetrics(Point shadowSize,
                Point shadowTouchPoint) {
             // super.onProvideShadowMetrics(shadowSize, shadowTouchPoint);

             final View view = mView.get();
             if (view != null) {
                shadowSize.set(( int) (view.getWidth() * 1.5F),
                        ( int) (view.getHeight() * 1.5F));
                shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2);
            } else {
                 // Log.e(View.VIEW_LOG_TAG,
                 // "Asked for drag thumb metrics but no view");
            }
        }
    }
}

代碼說明

1、 MyDragShadowBuilder主要用於縮放拖拽的ImageView，這里放大了1.5倍，而又不至於影響原控件，這里是放大兩倍

2、這里是通過長按來喚起拖拽操作，所以監聽了onLongPress

3、注意拖拽onDragListener是Android 3.0才新增的API

文章

Android Drag and Drop - Tutorial

Android開發者指南-用戶界面-拖放-Drag and Drop

下載

VogellaDraganddrop.zip

結束

歡迎交流！想做成拖動插入時自動兩邊擠開的效果，沒弄出來，出來是抖動的效果。

免責聲明！

本站轉載的文章為個人學習借鑒使用，本站對版權不負任何法律責任。如果侵犯了您的隱私權益，請聯系本站郵箱yoyou2525@163.com刪除。

猜您在找 android 拖拽控件移動【Android】無限滾動的HorizontalScrollView Android UI系列-----ScrollView和HorizontalScrollView winform 控件拖拽和縮放 Flutter 拖拽控件Draggable PyQt5 控件拖拽 Android基礎控件——RecyclerView實現拖拽排序側滑刪除效果 android 橫向滾動文字的實現【android】簡易實現橫向的ListView Android RecyclerView實現橫向滾動