ListView中滑动手势 - Android

Question

我是Android的新手。我得到了一个关于如何实现的教程，我实现了它，它工作正常。我需要实现相同的ViewSwitcher。当我刷卡歌像，我需要得到一些选项，如发挥，添加到队列等，

请去通过教程，并请帮助。我几乎从3周开始挣扎。

希望有人能帮助我。

编辑1： 下面的代码是主要活动：

import java.util.ArrayList; 
import java.util.HashMap; 

import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ListView; 

import android.view.GestureDetector; 
import android.view.GestureDetector.OnGestureListener; 
import android.view.MotionEvent; 
import android.widget.ViewSwitcher; 

public class CustomizedListView extends Activity implements OnGestureListener{ 
// All static variables 
static final String URL = "http://api.androidhive.info/music/music.xml"; 
// XML node keys 
static final String KEY_SONG = "song"; // parent node 
static final String KEY_ID = "id"; 
static final String KEY_TITLE = "title"; 
static final String KEY_ARTIST = "artist"; 
static final String KEY_DURATION = "duration"; 
static final String KEY_THUMB_URL = "thumb_url"; 


private ViewSwitcher switcher1; 
private GestureDetector gesturedetector = null; 
ListView list; 
LazyAdapter adapter; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>(); 

    XMLParser parser = new XMLParser(); 
    String xml = parser.getXmlFromUrl(URL); // getting XML from URL 
    Document doc = parser.getDomElement(xml); // getting DOM element 

    NodeList nl = doc.getElementsByTagName(KEY_SONG); 
    // looping through all song nodes <song> 
    for (int i = 0; i < nl.getLength(); i++) { 
     // creating new HashMap 
     HashMap<String, String> map = new HashMap<String, String>(); 
     Element e = (Element) nl.item(i); 
     // adding each child node to HashMap key => value 
     map.put(KEY_ID, parser.getValue(e, KEY_ID)); 
     map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE)); 
     map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST)); 
     map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION)); 
     map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL)); 

     // adding HashList to ArrayList 
     songsList.add(map); 

    } 


    list=(ListView)findViewById(R.id.list); 

    // Getting adapter by passing xml data ArrayList 
    adapter=new LazyAdapter(this, songsList);   
    list.setAdapter(adapter); 


    // Click event for single list row 
    list.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 


     } 
    }); 



} 


@Override 
public boolean onTouchEvent(MotionEvent event) { 
     return gesturedetector.onTouchEvent(event); 
} 

public boolean onDown(MotionEvent e) { 
    // TODO Auto-generated method stub 
    return false; 
} 
int SWIPE_MIN_VELOCITY = 100; 
int SWIPE_MIN_DISTANCE = 100; 
//Sự kiện khi bạn vuốt màn hình đưa sang một bên nào đó 

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) { 
    //Get Position 
    float ev1X = e1.getX(); 
    float ev2X = e2.getX(); 

    //Get distance of X (e1) to X (e2) 
    final float xdistance = Math.abs(ev1X - ev2X); 
    //Get veclocity of cusor 
    //Vận tốc = số điểm ảnh (px)/giây 
    final float xvelocity = Math.abs(velocityX); 

    //Vận tốc chuyển đổi X > 100 và khoảng cách từ điểm kéo đầu đến điểm kéo cuối > 100 
    if((xvelocity > SWIPE_MIN_VELOCITY) && (xdistance > SWIPE_MIN_DISTANCE)) 
    { 
     if(ev1X > ev2X)//Switch Left 
     { 
      previousView(); 
     } 
     else//Switch Right 
     { 
      nextView(); 
     } 
    } 

    return false; 
} 

public void onLongPress(MotionEvent e) { 

} 

public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) { 
    return false; 
} 

public void onShowPress(MotionEvent e) { 

} 

public boolean onSingleTapUp(MotionEvent e) { 
    return false; 
} 

//Next, Previous Views 
private void previousView() { 
    switcher1.showPrevious(); 
} 
private void nextView() { 
    switcher1.showNext(); 
} 

下面代码的XML文件。

<?xml version="1.0" encoding="utf-8"?> 
    <ViewSwitcher xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/viewSwitcher1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" > 

    <include 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    layout="@layout/list_row_main" /> 

    <include 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    layout="@layout/list_row_swipe" /> 

</ViewSwitcher> 

Answer 1

正如我理解你的问题，你的问题是检测ListView内的触摸手势，对不对？

因此，您必须在onInterceptTouchEvent方法中扩展ListView并检测横向触摸手势。

继承人是ListView的一个例子，它不会对水平触摸事件做出反应。这些事件将被分派给你的子视图，这实际上是你的列表项视图，它必须捕获这些事件（使用手势监听器）并触发ViewSwitcher。

public class SampleListView extends ListView { 

. 
. 
. 

@Override 
    public boolean onInterceptTouchEvent(MotionEvent ev) { 
     switch (ev.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
       // reset difference values 
       mDiffX = 0; 
       mDiffY = 0; 

       mLastX = ev.getX(); 
       mLastY = ev.getY(); 
       break; 

      case MotionEvent.ACTION_MOVE: 
       final float curX = ev.getX(); 
       final float curY = ev.getY(); 
       mDiffX += Math.abs(curX - mLastX); 
       mDiffY += Math.abs(curY - mLastY); 
       mLastX = curX; 
       mLastY = curY; 

       // don't intercept event, when user tries to scroll vertically 
       if (mDiffX > mDiffY) { 
        return false; // do not react to horizontal touch events, these events will be passed to your list item view 
       } 
     } 

     return super.onInterceptTouchEvent(ev); 
    } 

. 
. 
. 

} 

Answer 2

您可以使用motionevent来做到这一点。你只需要追踪速度。

例如。

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
     float velocityY) { 
    // TODO Auto-generated method stub 
     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();     
      }