Android HorizontalScrollView內子控制項橫向拖拽執行個體代碼_Android

前言

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

本文

截圖

實現代碼：

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，這裡放大了1.5倍，而又不至於影響原控制項，這裡是放大兩倍

   2、這裡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。

 以上就是Android HorizontalScrollView內子控制項橫向拖拽執行個體，歡迎交流，有需要參考下。