在Android應用中添加滑動手勢

Question

我正在嘗試向我的應用添加滑動手勢。我跟着一個教程，但我似乎無法得到它的工作。我究竟做錯了什麼？

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.GestureDetector; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 

public class Home extends Activity { 

     private static final int SWIPE_MIN_DISTANCE = 120; 
     private static final int SWIPE_THRESHOLD_VELOCITY = 200; 
     GridView gridMenu; 
     private GestureDetector gestureDetector; 

     /** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.home); 

      gridMenu = (GridView)findViewById(R.id.gridMenu); 

      gridMenu.setAdapter(new ImageAdapter(this)); 
      gridMenu.setHorizontalScrollBarEnabled(false); 

      gestureDetector = new GestureDetector(this, new OnSwipeGestureListener()); 

      gridMenu.setOnItemClickListener(new OnItemClickListener(){ 
      public void onItemClick(AdapterView<?>parent, View v, int position, long id){ 

       Intent url; 
       Bundle urlBundle = new Bundle(); 

       switch(position){ 
       case 0: 
        // Public Affairs 

        url = new Intent(Home.this, PublicAffairs.class); 
        urlBundle.putString("url", "http://kyfbnewsroom.com/category/public-affairs/feed"); 
        url.putExtras(urlBundle); 
        startActivity(url); 
        break; 

       case 1: 
        // Action Alerts 

        url = new Intent(Home.this, ActionAlerts.class); 
        urlBundle.putString("url", "http://kyfbnewsroom.com/category/public-affairs/notifications/feed"); 
        url.putExtras(urlBundle); 
        startActivity(url);  
        break; 

       case 2: 
        // Market Updates 

        url = new Intent(Home.this, MarketUpdates.class); 
        urlBundle.putString("url", "http://kyfbnewsroom.com/category/market-updates/feed"); 
        url.putExtras(urlBundle); 
        startActivity(url); 
        break; 

       case 3: 
        // Ag Stories 

        url = new Intent(Home.this, AgNews.class); 
        urlBundle.putString("url", "http://kyfbnewsroom.com/category/ag-news/feed"); 
        url.putExtras(urlBundle); 
        startActivity(url); 
        break; 

       case 4: 
        // KFB News 

        url = new Intent(Home.this, KFBMagazine.class); 
        urlBundle.putString("url", "http://kyfbnewsroom.com/category/kfb-news/feed/"); 
        url.putExtras(urlBundle); 
        startActivity(url); 
        break; 

       case 5: 
        // Member Benefits 


        Intent member = new Intent(Home.this, MemberBenefits.class); 
        startActivity(member); 
         //overridePendingTransition(R.anim.fadeon, R.anim.fadeoff); 
        break; 

       case 6: 
       //Monthly Video 

       startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.youtube.com/user/kentuckyfarmbureau"))); 
        break; 

       case 7: 
        // Photos 

       // Intent flickr = new Intent(Home.this, Flickr.class);      

         // startActivity(flickr); 
         //overridePendingTransition(R.anim.fadeon, R.anim.fadeoff); 

        // Farm Markets 

        Intent markets = new Intent(Home.this, RSFM.class); 
        startActivity(markets); 
        break; 

       case 8: 
        // Social Media 

        Intent social = new Intent(Home.this, SocialMedia.class);      
        startActivity(social); 
       //overridePendingTransition(R.anim.fadeon, R.anim.fadeoff); 
        break; 
       } 
      } 
      }); 
     } 

     @Override 
     public boolean onTouchEvent(MotionEvent event) 
     { 
      if (gestureDetector.onTouchEvent(event)) 
      { 
       return true; 
      } 
      else 
      { 
       return false; 
      } 
     } 

     private class OnSwipeGestureListener extends GestureDetector.SimpleOnGestureListener 
     { 
      @Override 
      public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) 
      { 
       float deltaX = e2.getX() - e1.getX(); 
       if ((Math.abs(deltaX) < SWIPE_MIN_DISTANCE) || (Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY)) 
       { 
        return false; 
       } 
       else 
       { 
        if (deltaX < 0) 
        { 
         handleSwipeLeftToRight(); 
        } 
        else 
        { 
         handleSwipeRightToLeft(); 
        } 
       } 
       return true; 
      } 
     } 

     private void handleSwipeLeftToRight() 
     { 
      System.out.println("Swipe Left to Right"); 
      Intent intent = new Intent(Home.this, RSFM.class); 
      startActivity(intent); 
     } 

     private void handleSwipeRightToLeft() 
     { 
      System.out.println("Swipe Right to Left"); 
      Intent intent = new Intent(Home.this, RSFM.class); 
      startActivity(intent); 
     } 



     /* 
     * This method is used to check whether there is internet connection or not. 
     */ 
     public boolean isConnect() { 
      ConnectivityManager cm = 
       (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
      NetworkInfo netInfo = cm.getActiveNetworkInfo(); 
      if (netInfo != null && netInfo.isConnectedOrConnecting()) { 
       return true; 
      } 
      return false; 
     } 

    public class ImageAdapter extends BaseAdapter { 

      Context mContext; 
      public static final int ACTIVITY_CREATE = 10; 

      public ImageAdapter(Context c){ 
       mContext = c; 
      } 

      public int getCount(){ 
       return MenuIcon.length; 
      } 

      public Object getItem(int position){ 
       return null; 
      } 

      public long getItemId(int position){ 
       return 0; 
      } 

      public View getView(int position, View convertView, ViewGroup parent){ 
       View v; 
       if(convertView == null){ 
        LayoutInflater li = getLayoutInflater(); 
        v = li.inflate(R.layout.grid_layout, null); 
       }else{ 
        v = convertView; 
       } 

       ImageView imgIcon = (ImageView) v.findViewById(R.id.imgIcon); 
       imgIcon.setImageResource(MenuIcon[position]); 
       //TextView txtIcon = (TextView) v.findViewById (R.id.txtIcon); 
       //txtIcon.setText(TextIcon[position]); 

       return v; 
      } 

      private Integer[] MenuIcon = { 
        R.drawable.publicaffairs, R.drawable.actionalerts, R.drawable.marketupdates, 
        R.drawable.agnews, R.drawable.kfbmagazine, R.drawable.memberbenefits, R.drawable.monthlyvideo, 
        R.drawable.roadsidemarkets, R.drawable.socialmedia 
      }; 


     } 


} 

Answer 1

你想抓住GridView？

你的onTouchEvent()只有當觸摸的視圖（在你的活動）不處理它本身（如ImageView）時才被調用。 GridView確實（可點擊）！

嘗試在GridView上設置OnTouchListener，並將這些事件推送到您的GestureDetector。