如何使用Fragment类中的View Pager创建滑动图像？

*我想要显示来自WebService的完整图像并在向前和向后两侧创建滑动图像。我用过ViewPager，PagerAdapter Class。片段类，如何使用Fragment类中的View Pager创建滑动图像？

package com.Fragment.Classes; 




    import java.util.ArrayList; 

    import org.json.JSONArray; 
    import org.json.JSONException; 
    import org.json.JSONObject; 

    import com.PersianBeauty.Adapter.ImagePagerAdapter; 
    import com.persianbeauty.R; 
    import com.utility.ConnectionDetector; 
    import com.utility.JSONfunctions; 


    import android.annotation.SuppressLint; 
    import android.app.Fragment; 
    import android.app.FragmentManager; 
    import android.app.ProgressDialog; 
    import android.os.AsyncTask; 
    import android.os.Bundle; 
    import android.support.v4.view.ViewPager; 
    import android.util.Log; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.widget.Toast; 

    @SuppressLint("ValidFragment") 
    public class ModelPortFoliolFragment extends Fragment 
    { 
     ImagePagerAdapter pagerAdapter; 

     ViewPager pager; 
     String[] imageUrls; 
     View rootView; 
     ArrayList<String> imageList; 
     // Declare Variables 
     JSONObject jsonobject; 
     JSONArray jsonarray; 

     // JSON Node names 
     static String TAG_MODEL = "model"; 
     static String TAG_MODELIMAG1 = "ModelImage"; 
     static String TAG_MODEL_IMAGE2 = "ModelImage_2"; 
     static String TAG_MODEL_IMAGE3= "ModelImage_3"; 

     ProgressDialog mProgressDialog; 
     String ID; 
     public ModelPortFoliolFragment(String ID) 
     { 
      this.ID=ID; 
     } 


     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) 
     { 

      rootView = inflater.inflate(R.layout.fragment_model_portfolio, container, false); 


      if(!ConnectionDetector.networkStatus(getActivity())) 
      { 
       ConnectionDetector.displayNoNetworkDialog(getActivity()); 
      } 
      else 
      { 
       new ParseModelPortFolioJSonData().execute(); 
      } 
      pager = (ViewPager) rootView.findViewById(R.id.pager); 
      // pager.setAdapter(new ImagePagerAdapter(imageList,getActivity())); 
      //pager.setCurrentItem(pagerPosition); 
      pagerAdapter=new ImagePagerAdapter(imageList,getActivity()); 
      pager.setAdapter(pagerAdapter); 
      //pager.setAdapter(new ImagePagerAdapter(imageList,getActivity())); 
      //pager.setCurrentItem(pagerPosition); 


      return rootView; 
     } 
    // @Override 
    // public void onDestroyView() 
    // { 
    //  super.onDestroyView(); 
    // 
    // } 
     // DownloadJSON AsyncTask 
     public class ParseModelPortFolioJSonData extends AsyncTask<Void, Void, Void> 
     { 


      @Override 
      protected void onPreExecute() 
      { 
       super.onPreExecute(); 
       mProgressDialog = new ProgressDialog(getActivity()); 
       mProgressDialog.setMessage("Please wait..."); 
       //   mProgressDialog.setIndeterminate(false); 
       mProgressDialog.setCancelable(false); 
       mProgressDialog.show(); 
      } 


      @Override 
      protected Void doInBackground(Void... arg0) 

      { imageList=new ArrayList<String>(); 
      // Create an array 

      try { 
       //http://www.persianbeautyawards.com/services/GetModelProfile.php?model_id=56 
       jsonobject = JSONfunctions.getJSONfromURL(getResources().getString(R.string.base_url).trim() +"GetModelPortfolio.php?model_id="+ID); 
       System.out.println(getResources().getString(R.string.base_url).trim() +"GetModelPortfolio.php?model_id="+ID+"....................."); 
       // Locate the array name in JSON 
       System.out.println(jsonobject+"................."); 
       if(jsonobject !=null) 
       { 
        jsonarray = jsonobject.getJSONArray(TAG_MODEL); 

        for (int i = 0; i < jsonarray.length(); i++) 
        { 
         jsonobject = jsonarray.getJSONObject(i); 

         imageList.add(jsonobject.getString(TAG_MODELIMAG1)); 
         System.out.println(jsonobject.getString(TAG_MODELIMAG1)+"..........."); 

         imageList.add(jsonobject.getString(TAG_MODEL_IMAGE2)); 
         System.out.println(jsonobject.getString(TAG_MODEL_IMAGE2)+"..........."); 

         imageList.add(jsonobject.getString(TAG_MODEL_IMAGE3)); 
         System.out.println(jsonobject.getString(TAG_MODEL_IMAGE3)+"..........."); 

        } 

        // Set the JSON Objects into the array 
       } 


      } catch (JSONException e) { 
       Log.e("Error", e.getMessage()); 
       e.printStackTrace(); 
      } 
      return null; 
      } 

      protected void onPostExecute(Void args) 
      { 
       if(imageList !=null) 
       { 
        pagerAdapter.notifyDataSetChanged(); 
        if (rootView != null) { 
         ViewGroup parentViewGroup = (ViewGroup) rootView.getParent(); 
         if (parentViewGroup != null) { 
          parentViewGroup.removeAllViews(); 
         } 
        } 

       } 


       else 
       { 
        Toast.makeText(getActivity(),"Server Error try Again", Toast.LENGTH_LONG).show(); 
       } 
       mProgressDialog.dismiss(); 
      } 
     } 
    }

我已经使用适配器类别从PageAdapter延伸，我PageAdapter类是，

PageAdapter: 

package com.PersianBeauty.Adapter; 



import java.util.ArrayList; 

import com.nostra13.universalimageloader.core.ImageLoader; 
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; 
import com.persianbeauty.R; 

import android.content.Context; 
import android.support.v4.view.PagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 



public class ImagePagerAdapter extends PagerAdapter 
{ 
    LayoutInflater inflator; 
    ImageView imgDisplay; 
Context context; 
ArrayList<String> slideShowImages; 
private ImageLoader imageLoader; 
public ImagePagerAdapter(ArrayList<String> slideShowImages,Context context) 
{ 
    this.context=context; 
    this.slideShowImages =slideShowImages; 
    imageLoader = ImageLoader.getInstance(); 
    imageLoader.init(ImageLoaderConfiguration.createDefault(context)); 
} 
@Override 
public int getCount() 
{ 
    return slideShowImages.size(); 
} 

@Override 
public boolean isViewFromObject(View view, Object object) { 
    return view == ((ImageView) object); 
} 

@Override 
public Object instantiateItem(ViewGroup container, int position) 
{ 
    inflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View viewLayout = inflator.inflate(R.layout.item_pager_view, container, 
      false); 
    imgDisplay = (ImageView) viewLayout.findViewById(R.id.image); 
// BitmapFactory.Options options = new BitmapFactory.Options(); 
// options.inPreferredConfig = Bitmap.Config.ARGB_8888; 
// Bitmap bitmap = BitmapFactory.decodeFile(_imagePaths.get(position), options); 
// imgDisplay.setImageBitmap(bitmap); 
// 

    System.out.println("ImageUrl---------------------"+slideShowImages.get(position)); 
    imageLoader.displayImage(slideShowImages.get(position).trim(), imgDisplay); 
    ((ViewPager) container).addView(imgDisplay, 0); 
    return imgDisplay; 

} 

@Override 
public void destroyItem(ViewGroup container, int position, Object object) 
{ 
    ((ViewPager) container).removeView((ImageView) object); 
} 
}

片段布局：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.view.ViewPager 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/pager" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" />

图像布局，其膨胀ImageLoader的类，

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:padding="1dip" > 

    <ImageView 
     android:id="@+id/image" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_gravity="center" 
     android:adjustViewBounds="true" 
     /> 


</FrameLayout>

，当我运行这段代码它给下面的错误，并不会加载任何类型的图像视图页面上

，

02-12 09:13:22.034: E/AndroidRuntime(3050): FATAL EXCEPTION: main 
02-12 09:13:22.034: E/AndroidRuntime(3050): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.view.ViewGroup.addViewInner(ViewGroup.java:3339) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.view.ViewGroup.addView(ViewGroup.java:3210) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.addView(ViewPager.java:1304) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.view.ViewGroup.addView(ViewGroup.java:3155) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at com.PersianBeauty.Adapter.ImagePagerAdapter.instantiateItem(ImagePagerAdapter.java:62) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:832) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.populate(ViewPager.java:982) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:550) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:509) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager.dataSetChanged(ViewPager.java:908) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.ViewPager$PagerObserver.onChanged(ViewPager.java:2819) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.support.v4.view.PagerAdapter.notifyDataSetChanged(PagerAdapter.java:276) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at com.Fragment.Classes.ModelPortFoliolFragment$ParseModelPortFolioJSonData.onPostExecute(ModelPortFoliolFragment.java:151) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at com.Fragment.Classes.ModelPortFoliolFragment$ParseModelPortFolioJSonData.onPostExecute(ModelPortFoliolFragment.java:1) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.os.AsyncTask.finish(AsyncTask.java:631) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.os.AsyncTask.access$600(AsyncTask.java:177) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.os.Handler.dispatchMessage(Handler.java:99) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.os.Looper.loop(Looper.java:137) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at java.lang.reflect.Method.invoke(Method.java:511) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
02-12 09:13:22.034: E/AndroidRuntime(3050):  at dalvik.system.NativeStart.main(Native Method)

请给我一些建议。

来源

2014-02-12 Sandip Phatangare

具有u从给定的回答解决问题了吗？ – Erum

创建活动名为适配器的属性：

private ImagePagerAdapter adapter;

和onCreate：

adapter= new ImagePagerAdapter(imageList,getActivity());

就叫adapter.notifyDataSetChange()：

if(imageList !=null) 
     { 
      adapter.notifyDataSetChange(); 
     }

来源

2014-02-12 07:07:52

如何使用Fragment类中的View Pager创建滑动图像？

回答

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