安卓: ScrollView onTouch事件截获ImageVIew ontouch Drag

Question

我正在使用scrollview中的imageview控制器。当涉及到实现和测试时，我发现滚动总是重写onTouch事件而不是imageView (dragImage)。

我尝试使用它来启用滚动

scv.setOnTouchListener(null);    

并禁用此功能

scv.setOnTouchListener( new OnTouchListener(){ 
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return true; 
    }
});

它显示dragImage只拖动一个很小的移动，而不是随意拖动到我想要的地方。你能告诉我当我触摸ImageView而不是scrollView时，关闭滚动的更好的方法吗？

以下是我的工作：

public static class PlaceholderFragment extends Fragment   {



private static final String ARG_SECTION_NUMBER = "section_number";

    /**
     * Returns a new instance of this fragment for the given section number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);            
        return fragment;
    }




    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View  rootView = inflater.inflate(R.layout.frag_flight_bank, container, false);
        r1  = (RelativeLayout) rootView.findViewById(R.id.relativeLayouyt1);

        r2  = (RelativeLayout) rootView.findViewById(R.id.relativeLayouyt2);
        r3  = (RelativeLayout) rootView.findViewById(R.id.relativeLayouyt3);
        r4  = (RelativeLayout) rootView.findViewById(R.id.relativeLayouyt4);
        r5  = (RelativeLayout) rootView.findViewById(R.id.relativeLayouyt5);
        rTop  = (RelativeLayout) rootView.findViewById(R.id.rTop);

        scv = (ScrollView) rootView.findViewById(R.id.scrollView1);
        initialise(rootView);

        return rootView;
    }



    private void initialise(View rootView) {
        // TODO Auto-generated method stub

        tvCustom= (TextView) rootView.findViewById(R.id.ttvCustomize);
        tvRename= (TextView) rootView.findViewById(R.id.tvRename);
        tvNormal= (TextView) rootView.findViewById(R.id.tvNorma);
        tvExper= (TextView) rootView.findViewById(R.id.txExper);


    ...
            dragImage = (ImageView) rootView.findViewById(R.id.dragImage);
            //dragImage.setVisibility(View.GONE);

        dragImage.setOnTouchListener(new OnTouchListener(){
            private int _xDelta;
            private int _yDelta;
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                final int X = (int) event.getRawX();
                final int Y = (int) event.getRawY();
                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                case MotionEvent.ACTION_DOWN:
                    RelativeLayout.LayoutParams lParams =      (RelativeLayout.LayoutParams) dragImage
                    .getLayoutParams();

                    _xDelta = X - lParams.leftMargin;
                    _yDelta = Y - lParams.topMargin;
                    break;
                case MotionEvent.ACTION_UP:
                    break;
                case MotionEvent.ACTION_POINTER_DOWN:
                    break;
                case MotionEvent.ACTION_POINTER_UP:
                    break;
                case MotionEvent.ACTION_MOVE:
                    RelativeLayout.LayoutParams ParamsA = (RelativeLayout.LayoutParams) dragImage
                    .getLayoutParams();
                    ParamsA.leftMargin = X - _xDelta;
                    ParamsA.topMargin = Y - _yDelta;
                    ParamsA.rightMargin = -250;
                    ParamsA.bottomMargin = -250;

                    dragImage.setLayoutParams(ParamsA);
                    break;
                }
                return true;

            }

        });

解决方案:在开头插入(onCreteView)

scv.setOnTouchListener(new View.OnTouchListener() 
        {
            public boolean onTouch(View p_v, MotionEvent p_event) 
            {
                dragImage.getParent().requestDisallowInterceptTouchEvent(false);
                //  We will have to follow above for all scrollable contents
                return false;
            }
        });

在setOnTouchListener中，onTouch方法：

v.getParent().requestDisallowInterceptTouchEvent(true);

Answer 1

在您的MotionEvent.ACTION_DOWN和MotionEvent.ACTION_MOVE案例中添加以下代码可以解决您的问题：

dragImage.getParent().requestDisallowInterceptTouchEvent(true);

Answer 2

我终于让它正常工作了，你还需要在onTouch事件中返回true。下面的代码将缩放您的图像以填充imageview像素宽度。用户可以拖动封面图片来重新定位，您将需要跟踪Y矩阵以供以后显示。ImageView比例类型设置为矩阵。

//declare in activity
private float lastY = 0;

//Added to onCreate of Activity
            if (CoverPic!=null){
            CoverPic.setOnTouchListener(new OnTouchListener() {
                public boolean onTouch(View v, MotionEvent event) {
                     if (event.getAction() == MotionEvent.ACTION_DOWN) {
                         lastY = event.getY();
                         CoverPic.getParent().requestDisallowInterceptTouchEvent(true);
                         return true;
                     } 
                     else if (event.getAction() == MotionEvent.ACTION_MOVE) {
                         float[] values = new float[9];
                         Matrix m = CoverPic.getImageMatrix();
                         m.getValues(values);
                         float y = values[Matrix.MTRANS_Y];
                         float deltaY = lastY - event.getY();                            
                         y -= deltaY;

                         //original height / original width x new width = new height
                         int newwidth = CoverPic.getWidth();
                         float curwidth = CoverPic.getMeasuredWidth();
                         curwidth = CoverPic.getDrawable().getBounds().width();
                         float newscale = newwidth / curwidth;

                         //We need to limit y Max and Min
                         int viewheight = CoverPic.getHeight();
                         float curheight = CoverPic.getDrawable().getBounds().height() * newscale;
                         float limitmove = curheight - viewheight;
                         limitmove = limitmove * -1;
                         if (y<limitmove) y = limitmove;
                         if (y>0) y = 0;                             

                         Matrix matrix = new Matrix();
                         matrix.postScale(newscale, newscale);
                         matrix.postTranslate(values[Matrix.MTRANS_X], y);

                         profile.setCoverOffY(y); //Update profile cover for saving                          
                         CoverPic.setImageMatrix(matrix);                            
                         CoverPic.invalidate();
                         CoverPic.getParent().requestDisallowInterceptTouchEvent(true);
                         return true;
                     } 
                     else if (event.getAction() == MotionEvent.ACTION_UP) {
                         CoverPic.getParent().requestDisallowInterceptTouchEvent(true);
                         return true;
                     }
                     return false;
                }
            }
            );                          
        }