我有一个列表视图。单击项目时，项目的详细视图将打开。此布局有许多小部件，如文本视图，ImageView Buttons等。现在我想滑动项目的详细视图，以显示列表中下一项的详细视图。同样是从左到右的前一项。
我无法实现视图滑动我已经完成了如何获取列表中的prev / next项目。但实际滑动是问题
我在Android: Swipe left to right and right to left
中尝试过gesturedetector和其他一些例子。但是当我试图滑动时，没有效果。我根本没有看到任何视觉滑动。
如何解决这个问题？
尝试了这段代码，但仍然没有发生幻灯片
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;
}
}
答案 0 :(得分：2)
我认为一个新的答案是个好主意，因为旧答案是如此不同。
我将从一些背景开始： 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，我们想要更改图片和文本，然后将滚动条移回中间以准备下一次滑动。当滚动视图停止时，有人已经回答了如何监听 我已经包含了一个几乎可以运用的例子，说明如何使用它来获得你想要的效果。
我希望这会有所帮助，并随时询问您是否还有问题。
@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应该是这些行的东西。要完成这项工作还有很多工作要做，但我希望这能让你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>
答案 1 :(得分：1)
如果我理解正确，您只需要使用手势监听器，然后调用您用来填充下一个信息实例的所有文本视图和图像视图的方法。
我发现这个例子在我学习手势识别时非常有用。
首先将手势监听器添加到公共类myClass
import android.widget.Toast;
public class myClass extends Activity implements OnGestureListener {
接着是以后的事情，以便我们可以倾听 对于每个触摸事件。
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;
}
您可以将用于调用前一个或下一个实例的方法放在toast所在的相关侦听器中。
您可以通过更改这些变量来调整滑动的感官度
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;
我希望这会有所帮助。
编辑：
对不起混淆，你的onCreate应该包含gestureScanner = new GestureDetector（this）;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_details);
setContent();
gestureScanner = new GestureDetector(this);
}
除了视觉效果之外，应该让它工作。您可以尝试使用ScrollView来帮助处理幻灯片。