Question

我尝试实施图片控件的垂直滑块。图像位于ScrollView内。当涉及ImageView的垂直拖动时，相对布局的上边距总是提供不同的读数。

如果在向下拖动时大于600，则相对布局的背景图像与我拖动的图像位置一起垂直延伸。

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:fillViewport="true" >
...


   <RelativeLayout
                android:id="@+id/relativeLayouyt6"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_below="@+id/rTop"
                android:background="@drawable/plain" >

                <ImageView
                    android:id="@+id/dragImage"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:src="@drawable/arrow_one"
                    android:visibility="gone" />
            </RelativeLayout>

请你告诉我如何

获取我在我的滚动视图中滚动的偏移量？
我知道触摸位置减去滚动位置加上图像Y位置，完成拖动后如何实现此参数？
如何在相对布局中设置imageview的相对边界？将此背景图像作为图像视图更明智吗？
如果我以编程方式重新定位6个相对布局但是达到相同的宽度，是否会影响滚动位置和scollview总高度？如果是这样，如何计算重新定位的偏移量Y？

以下是截至2月11日的代码：

dragImage.setOnTouchListener(new OnTouchListener(){
                //private int _xDelta;
                private int _yDelta;
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                v.getParent().requestDisallowInterceptTouchEvent(true);



                final float y = event.getY();

                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    //_yDelta = Y - lParams.topMargin;
                    mOldY2 = y;
                    break;
                case MotionEvent.ACTION_UP:
                    mViewPager.setPagingEnabled(true);
                    break;
                case MotionEvent.ACTION_POINTER_DOWN:
                    break;
                case MotionEvent.ACTION_POINTER_UP:
                    break;
                case MotionEvent.ACTION_MOVE:
                    btn4.setBackgroundResource(R.drawable.fbl02);
                    final float dy = y - mOldY2;
                    mNewY2 += dy;
                    mOldY2 = y;
                    System.out.println(mNewY2);                 

                    while(mNewY2 > 224){
                        mNewY2 -= 224;
                    }

                    while(mNewY2 < 157){
                        mNewY2 += 157;
                    }


                    if(mNewY2 < 157 || mNewY2 > 224)
                        break;

                    v.setTranslationY((int)mNewY2);

                    v.invalidate();

                    float power = (float) ( 51.5/67 -(0.2/67) * mNewY2) ;
                    System.out.println(power);

                    Float roundF = new Float( Math.round(power));
                    midBandStick = roundF;
                    btn4.setText(String.valueOf(midBandStick) );
                    //}
                    //break;
                }
                return true;

            }

以下是我的代码：

public static void setRLBelowAnother(RelativeLayout rA , RelativeLayout rB   ){         
        RelativeLayout.LayoutParams rparam4 =  
                (android.widget.RelativeLayout.LayoutParams) rB.getLayoutParams();
        rparam4.addRule(RelativeLayout.BELOW, rA.getId());              
        rB.setLayoutParams(rparam4);             
    } 



            setRLBelowAnother(rTop , r1);
            setRLBelowAnother(r1 , r2);
            setRLBelowAnother(r2 , r6  );
            setRLBelowAnother(r6 , r3  );
            setRLBelowAnother(r3 , r4 );
            setRLBelowAnother(r4 , r5  );
    dragImage.setVisibility(View.VISIBLE);
        dragImage.setImageResource(R.drawable.slide_lshort);

        dragImage.setX((float) (0.15*screenWidth));
        dragImage.setY((float) (0.05*screenHeight));
        dragImage.setOnTouchListener(new OnTouchListener(){
            //private int _xDelta;
            private int _yDelta;
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                v.getParent().requestDisallowInterceptTouchEvent(true);
                final int X = (int) event.getX();
                final int Y = (int) event.getY();
                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:
                    mViewPager.setPagingEnabled(true);

                    break;
                case MotionEvent.ACTION_POINTER_DOWN:
                    break;
                case MotionEvent.ACTION_POINTER_UP:
                    break;
                case MotionEvent.ACTION_MOVE:

                    midStick = 0.2f;
                    btn4.setBackgroundResource(R.drawable.fbl02);

                    RelativeLayout.LayoutParams ParamsA = (RelativeLayout.LayoutParams) dragImage
                    .getLayoutParams();
                    //ParamsA.leftMargin = X - _xDelta;
                    ParamsA.topMargin = Y - _yDelta;
                    //ParamsA.rightMargin = -250;
                    ParamsA.bottomMargin = -250;
                    mViewPager.setPagingEnabled(false);


                    int offYb = 0;
                    int pos = ParamsA.topMargin +  offYb ;
                    if(pos > -52 &&  pos < 582 ){
                        dragImage.setLayoutParams(ParamsA);
                        System.out.println(ParamsA.topMargin);
                        float power = (float) (100 + (900/634) * ParamsA.topMargin) ;
                        Float roundF = new Float( Math.round(power));
                        midStick = roundF;
                        btn4.setText(String.valueOf(midStick));

                    }
                    break;
                }
                return true;

            }

        });

Answer 1

从getScrollY()调用ScrollView方法获取Y索引（滚动索引）
如果我理解（否则请纠正我）你可以在ImageView和RelativeLayout之间获得一个框架（边界），为ImageView添加填充或边距。你只需要调用android：padding =＆＃34;＆＃34;或者android：margin =＆＃34;＆＃34;
如果新添加的RelativeLayout / ImageView不完全适合可用空间，则ScrollView的高度会发生变化，scrollY也会发生变化。添加新布局后，您可以从ScrollView获取scrollY并查看ScrollView滚动到的位置。

你能改进问题2,3和4吗？这很令人困惑。

Android拖动imageview时拉伸背景图像

1 个答案: