android：向左或向右滑动以滑动视图

Question

我有一个列表视图。单击某个项目时，将打开该项目的详细视图。这个布局有很多小部件，比如文本视图ImageView Buttons等。现在我想滑动这个项目的细节视图来显示列表中下一个项目的细节视图。类似的从左到右的前一项。

我无法实现视图滑动我已经完成了如何获取列表中的上一个/下一个项目。但实际滑动是问题

我在Android 中尝试过手势检测器：从左到右和从右到左滑动

以及其他一些例子。但是当我尝试滑动时，没有效果。我根本看不到任何视觉滑动。

如何解决这个问题？

试过这段代码，但仍然没有幻灯片发生

 public class ProductActivity extends Activity implements OnGestureListener {


     @
     Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.product_details);
         setContent();
     }

     private void setContent() {
         Bundle extras = getIntent().getExtras();
         TextView title = (TextView) findViewById(R.id.title);
         title.setText(extras.getString("Title"));
         TextView desc = (TextView) findViewById(R.id.desc);
         desc.setText(extras.getString("Desc"));
         Button buy = (Button) findViewById(R.id.buy);
         String priceTag = ("$" + String.format("%.2g", extras.getDouble("Price")) + "  Buy Now >>");
         buy.setText(priceTag);
         ImageView image = (ImageView) findViewById(R.id.productimage);
         Utils.imageLoader.DisplayImage(extras.getString("Image"), image);

     }




     private static final int SWIPE_MIN_DISTANCE = 6; // 120;
     private static final int SWIPE_MAX_OFF_PATH = 125; // 250;
     private static final int SWIPE_THRESHOLD_VELOCITY = 100; // 200;
     private GestureDetector gestureScanner;

     @
     Override
     public boolean onTouchEvent(MotionEvent me) {
         return gestureScanner.onTouchEvent(me);
     }

     // @Override
     public boolean onDown(MotionEvent e) {
         // viewA.setText("-" + "DOWN" + "-");
         return true;
     }

     // @Override
     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
         float velocityY) {
         try {
             if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                 return false;
             // right to left swipe
             if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                 Toast.makeText(getApplicationContext(), "Left Swipe",
                     Toast.LENGTH_SHORT).show();

             } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                 Toast.makeText(getApplicationContext(), "Right Swipe",
                     Toast.LENGTH_SHORT).show();

             } else if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                 Toast.makeText(getApplicationContext(), "Swipe up",
                     Toast.LENGTH_SHORT).show();

             } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                 Toast.makeText(getApplicationContext(), "Swipe down",
                     Toast.LENGTH_SHORT).show();

             }
         } catch (Exception e) {
             // nothing
         }

         return true;
     }

     @
     Override
     public void onLongPress(MotionEvent e) {
         Toast mToast = Toast.makeText(getApplicationContext(), "Long Press",
             Toast.LENGTH_SHORT);
         mToast.show();
     }

     // @Override
     public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
         float distanceY) {
         // viewA.setText("-" + "SCROLL" + "-");
         return true;
     }

     // @Override
     public void onShowPress(MotionEvent e) {
         // viewA.setText("-" + "SHOW PRESS" + "-");
     } // @Override

     public boolean onSingleTapUp(MotionEvent e) {
         Toast mToast = Toast.makeText(getApplicationContext(), "Single Tap",
             Toast.LENGTH_SHORT);
         mToast.show();
         return true;
     }

 }

Answer 1

我认为一个新的答案是个好主意，因为旧的答案是如此不同。

我将从一些背景知识开始：这里的想法是使用水平滚动视图以漂亮的方式移动到下一组控件。因此，当用户停止向左或向右滚动滚动视图时，我们要更改图片和文本，然后将滚动移回中间，为下一次滑动做准备。有人已经回答了如何在滚动视图停止时监听，我已经提供了一个几乎有效的示例，说明如何使用它来获得您正在寻找的效果。

我希望这对您有所帮助，如果您还有问题，请随时询问。

 @Override
 protected void onScrollChanged(int x, int y, int oldX, int oldY) {
     if (Math.abs(y - oldY) > SlowDownThreshold) {
         currentlyScrolling = true;
     } else {
         currentlyScrolling = false;
         if (!currentlyTouching) {
             //scrolling stopped...handle here
             //Check if it was a left or right swipe by comparing the new and old scroll locations
             if (y > oldY) {
                 //Scroll moved Right
                 //So we would do something like 
                 setContents(Index + 1);
                 //We find out where the middle of the scroll is
                 int middleHScroll = (Hscrollview.getMeasuredWidth() / 2) - (Hscrollview.getMeasuredWidth() / 2)
                 //We then return the scroll view to the middle
                 HScroll.scrollTo(middleHScroll);
             } else {
                 //Scroll moved Left
                 //We get set the pictures and text to the previous Index of the contents
                 setContents(Index - 1);
                 //We find out where the middle of the scroll is
                 int middleHScroll = (Hscrollview.getMeasuredWidth() / 2) - (Hscrollview.getMeasuredWidth() / 2)
                 //We then return the scroll view to the middle
                 HScroll.scrollTo(middleHScroll);
             }
             super.onScrollChanged(x, y, oldX, oldY);
         }
     }
 }

xml 应该是这样的。要实现这一目标，还有很多工作要做，但我希望这能让您朝着正确的方向前进。

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/textview1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/title_bar"
            android:gravity="center_horizontal"
            android:text="PRODUCTS >> PRODUCT DETAILS" />

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <RelativeLayout
                android:id="@+id/RelativeLayout1"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:orientation="vertical"
                android:weightSum="2" >

                <HorizontalScrollView
                    xmlns:android="http://schemas.android.com/apk/res/android"
                    android:id="@+id/HorizontalScrollView1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentTop="true" >


                    <LinearLayout
                        xmlns:android="http://schemas.android.com/apk/res/android"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginRight="70dp"
                        android:orientation="horizontal" >



                        <ImageView
                            android:id="@+id/productimage3"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="70dp"
                            android:layout_marginRight="20dp"
                            android:layout_weight="1"
                            android:background="@drawable/product_detail_gradient"
                            android:minHeight="100dp"
                            android:minWidth="100dp" />

                        <ImageView
                            android:id="@+id/productimage2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="70dp"
                            android:layout_marginRight="70dp"
                            android:layout_weight="1"
                            android:background="@drawable/product_detail_gradient"
                            android:minHeight="100dp"
                            android:minWidth="100dp" />

                        <ImageView
                            android:id="@+id/productimage1"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="70dp"
                            android:layout_marginRight="70dp"
                            android:layout_weight="1"
                            android:background="@drawable/product_detail_gradient"
                            android:minHeight="100dp"
                            android:minWidth="100dp" />

                    </LinearLayout>
                </HorizontalScrollView>

                <RelativeLayout
                    android:id="@+id/description"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_alignParentBottom="true"
                    android:layout_alignParentLeft="true"
                    android:layout_below="@+id/HorizontalScrollView1"
                    android:layout_weight="1"
                    android:background="@drawable/black_img_bg" >

                    <TextView
                        android:id="@+id/title"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:textSize="15dip"
                        android:textStyle="bold" >
                    </TextView>

                    <TextView
                        android:id="@+id/desc"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:layout_below="@+id/title" >
                    </TextView>

                    <Button
                        android:id="@+id/addtocart"
                        android:layout_width="80dip"
                        android:layout_height="wrap_content"
                        android:layout_alignParentBottom="true"
                        android:layout_alignParentLeft="true"
                        android:background="@drawable/button_green_lhs"
                        android:gravity="left|center_vertical"
                        android:onClick="addToCartOrBuy"
                        android:text="Add To Cart"
                        android:textSize="10dip" />

                    <Button
                        android:id="@+id/buy"
                        android:layout_width="150dip"
                        android:layout_height="wrap_content"
                        android:layout_alignParentBottom="true"
                        android:layout_toRightOf="@+id/addtocart"
                        android:background="@drawable/button_orange_mid"
                        android:onClick="addToCartOrBuy"
                        android:text="Buy"
                        android:textSize="10dip" />

                    <Button
                        android:id="@+id/tellafriend"
                        android:layout_width="80dip"
                        android:layout_height="wrap_content"
                        android:layout_alignParentBottom="true"
                        android:layout_alignParentRight="true"
                        android:layout_toRightOf="@+id/buy"
                        android:background="@drawable/button_green_rhs"
                        android:gravity="right|center_vertical"
                        android:onClick="tellAFriend"
                        android:text="Tell A Friend"
                        android:textSize="10dip" />
                </RelativeLayout>
            </RelativeLayout>
        </RelativeLayout>

    </LinearLayout>