Question

我的ListView项目布局在中心使用了HorizontalScrollView。我在父android:descendantFocusability="blocksDescendants"上使用了android属性“LinearLayout”，因此ListView项仍然可以选择。

我遇到的问题是，当点击ListView项HorizontalScrollView的部分时，不会调用ListView项目点击事件。

如何让HorizontalScrollView的点击事件调用ListView列表项单击事件？

Answer 1

HorizontalScrollView没有“onClick（）”，请看这个 http://developer.android.com/reference/android/widget/HorizontalScrollView.html

它支持手势并且“onTouchEvent（MotionEvent ev）”

因此您可以将其用作点击。请参阅我准备的以下演示。

//      Followin  code will not work  for HorizontalScrollView
        /*hsv1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(HorizontalListActivity.this, tvMiddle.getText().toString().trim(), Toast.LENGTH_SHORT).show();
            }
        });*/

        hsv1.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Toast.makeText(YourActivity.this, "Your Msg", Toast.LENGTH_SHORT).show();
                return false;
            }
        });

Answer 2

如下所示，将布尔变量touchDown和touchUp添加到适配器类似乎工作得很好：

private class MyListAdapter extends ArrayAdapter<MyObject>{
    ...
    //touch down + touch up with no other motion events in between = click
    boolean touchDown = false;
    boolean touchUp = false;
    private int iHostViewID;
    ...

    public MyListAdapter(Context context,int viewResourceId, List<MyObject> objects) {
        super(context, textViewResourceId, objects);
        iHostViewID = viewResourceId;
    }

    @Override
    public View getView(int pos, View convertView, ViewGroup parent){
        View itemView = convertView;

        //iff we cannot re-use a view
        if(itemView == null){
            LayoutInflater inflater = (
            (LayoutInflater)hContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            itemView = inflater.inflate(iHostViewID, null);
        }

        final View hItemView = itemView;
        final int hPosition = pos;
        ...
        final HorizontalScrollView textDataSV = 
        (HorizontalScrollView)itemView.findViewById(R.id.widget_hsv);
        textDataSV.setOnTouchListener(new OnTouchListener(){

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

                    if(event.getAction() == MotionEvent.ACTION_DOWN){

                        touchDown = true;
                    }
                    else if(event.getAction() == MotionEvent.ACTION_UP){

                        touchUp = true;
                     }

                    else{

                        touchDown = false;
                        touchUp = false;
                    }

                    if(touchDown && touchUp){
                        //click 
                        //mMyListView is the reference to the list view
                        //instantiated in the view controller class responsible
                        //for setting this adapter class as the list view's adapter
                        mMyListView.performItemClick(hItemView, hPosition, 
                        hItemView.getId());
                    }



                    return false;
                 }
         });
    }
}

这远非完美，但应该适用于大多数标准用例

ListView项目中的水平Scrollview？

2 个答案: