ImageButtonがGridViewでアプリケーションをクラッシュさせます

Question

ねえ、私はアンドロイドアプリのGridViewにImageButtonを追加しようとしています。私はImageButtonを追加するまで、アプリケーションは正常に実行されます。ここでlogCat

であることはここに私のここでXML

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 

<RelativeLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" > 
<ImageButton 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:id="@+id/calendar" 
android:src="@drawable/android_calendar" 
android:layout_marginRight="120dp" 
android:layout_alignParentBottom="true" 
android:layout_alignParentLeft="true" 
android:layout_alignParentStart="true" /> 

</RelativeLayout> 

<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/gridView" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:columnWidth="120dp" 
android:numColumns="auto_fit" 
android:stretchMode="columnWidth"> 
</GridView> 

</RelativeLayout> 

Javaファイルです。

package com.yourname.photogallery; 

import java.util.ArrayList; 

import android.annotation.TargetApi; 
import android.app.Activity; 
import android.app.SearchManager; 
import android.app.SearchableInfo; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.Build; 
import android.os.Bundle; 
import android.os.Handler; 
import android.preference.PreferenceManager; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.GridView; 
import android.widget.ImageButton; 
import android.widget.ImageView; 
import android.widget.SearchView; 

public class PhotoGalleryFragment extends VisibleFragment { 
private static final String TAG = "PhotoGalleryFragment"; 
GridView mGridView; 
ArrayList<GalleryItem> mItems; 
ThumbnailDownloader<ImageView> mThumbnailThread; 

private ImageButton calendarButt; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setRetainInstance(true); 
    setHasOptionsMenu(true); 

    updateItems(); 

    calendarButt = (ImageButton) mGridView.findViewById(R.id.calendar); 
    calendarButt.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

     } 
    }); 

    //mThumbnailThread = new ThumbnailDownloader<ImageView>(); 
    mThumbnailThread = new ThumbnailDownloader<ImageView>(new Handler()); 
    mThumbnailThread.setListener(new ThumbnailDownloader.Listener<ImageView>(){ 
     public void onThumbnailDownloaded(ImageView imageView, Bitmap thumbnail) { 
      if (isVisible()) { 
       imageView.setImageBitmap(thumbnail); 
      } 
      } 
     }); 

    mThumbnailThread.start(); 
    mThumbnailThread.getLooper(); 
    Log.i(TAG, "Background thread started"); 
} 
public void updateItems() { 
    new FetchItemsTask().execute(); 
} 



@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View v = inflater.inflate(R.layout.fragment_photo_gallery, container, false); 


    mGridView = (GridView)v.findViewById(R.id.gridView); 

    setupAdapter(); 

    mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> gridView, View view, int pos, 
           long id) { 
      GalleryItem item = mItems.get(pos); 

      Uri photoPageUri = Uri.parse(item.getPhotoPageUrl()); 
      Intent i = new Intent(getActivity(), PhotoPageActivity.class); 
      i.setData(photoPageUri); 

      startActivity(i); 
     } 
    }); 

    return v; 
} 

@Override 
public void onDestroyView() { 
    super.onDestroyView(); 
    mThumbnailThread.clearQueue(); 
} 

@Override 
@TargetApi(11) 
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
    super.onCreateOptionsMenu(menu, inflater); 
    inflater.inflate(R.menu.fragment_photo_gallery, menu); 

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { 
     //pull out the SearchView 
     MenuItem searchItem = menu.findItem(R.id.menu_item_search); 
     SearchView searchView = (SearchView)searchItem.getActionView(); 

     //Get the data from out searchable.xml as a Searchable 
     SearchManager searchManager = (SearchManager)getActivity() 
       .getSystemService(Context.SEARCH_SERVICE); 
     ComponentName name = getActivity().getComponentName(); 
     SearchableInfo searchInfo = searchManager.getSearchableInfo(name); 
     searchView.setSearchableInfo(searchInfo); 
    } 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.menu_item_search: 
     getActivity().onSearchRequested(); 
     return true; 
    case R.id.menu_item_clear: 
     PreferenceManager.getDefaultSharedPreferences(getActivity()) 
     .edit() 
     .putString(FlickrFetchr.PREF_SEARCH_QUERY, null) 
     .commit(); 
     updateItems(); 
     return true; 
     case R.id.menu_item_toggle_polling: 
     boolean shouldStartAlarm = !PollService.isServiceAlarmOn(getActivity()); 
     PollService.setServiceAlarm(getActivity(), shouldStartAlarm); 

      if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) 
       getActivity().invalidateOptionsMenu(); 

      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
    } 
} 

@Override 
public void onPrepareOptionsMenu(Menu menu) { 
    super.onPrepareOptionsMenu(menu); 

    MenuItem toggleItem = menu.findItem(R.id.menu_item_toggle_polling); 
    if(PollService.isServiceAlarmOn(getActivity())) { 
     toggleItem.setTitle(R.string.start_polling); 
    } 
} 

@Override 
public void onDestroy() { 
    super.onDestroy(); 
    mThumbnailThread.quit(); 
    Log.i(TAG, "Background thread destroyed"); 
} 



void setupAdapter() { 
    if (getActivity() == null || mGridView == null) return; 

    if (mItems !=null) { 
     //mGridView.setAdapter(new ArrayAdapter<GalleryItem>(getActivity(), android.R.layout.simple_gallery_item, mItems)); 
    mGridView.setAdapter(new GalleryItemAdapter(mItems)); 
    } 
    else { 
     mGridView.setAdapter(null); 
    } 
} 



private class FetchItemsTask extends AsyncTask<Void, Void, ArrayList<GalleryItem>>{ 
//private class FetchItemsTask extends AsyncTask<Void, Void, Void> { 
    @Override 
    protected ArrayList<GalleryItem> doInBackground(Void... params) { 
    //protected Void doInBackground(Void... params) { 
     /*try { 
      String result = new FlickrFetchr().getUrl("http://www.google.com"); 
      Log.i(TAG, "Fetched contents of URL: " + result); 
     } 
     catch (IOException ioe) { 
      Log.e(TAG, "Failed to fetch URL: ", ioe); 
     }*/ 
     /*new FlickrFetchr().fetchItems(); 
     return null;*/ 
     //String query = "android"; //Just for testing 
     Activity activity = getActivity(); 
     if(activity==null) 
      return new ArrayList<GalleryItem>(); 

     String query = PreferenceManager.getDefaultSharedPreferences(activity) 
       .getString(FlickrFetchr.PREF_SEARCH_QUERY, null); 
     if(query != null) { 
      return new FlickrFetchr().search(query); 
     } 
     else { 
     return new FlickrFetchr().fetchItems(); 
     } 

     } 
    @Override 
    protected void onPostExecute(ArrayList<GalleryItem> items) { 
     mItems = items; 
     setupAdapter(); 
    } 
    } 
private class GalleryItemAdapter extends ArrayAdapter<GalleryItem> { 
    public GalleryItemAdapter (ArrayList<GalleryItem> items) { 
     super(getActivity(), 0, items); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      convertView = getActivity().getLayoutInflater() 
        .inflate(R.layout.gallery_item, parent, false); 
     } 
     ImageView imageView = (ImageView)convertView 
       .findViewById(R.id.gallery_item_imageView); 
       imageView.setImageResource(R.drawable.brian_up_close); 
     GalleryItem item = getItem(position); 
     mThumbnailThread.queueThumbnail(imageView, item.getUrl()); 

       return convertView; 
     } 
    } 
} 

これは、gridView.findViewByIdと関係があると思います。私がgridViewを離して、findViewByIdを使用すると、エラーが解決できず、int argを探しています。前もって感謝します。

Answer 1

calendarButt = (ImageButton) mGridView.findViewById(R.id.calendar)

1. mGridViewは

2. R.id.calendarがあなたのGridViewの子ではありません。この時点では準備ができていないことがあります。

3. カレンダーの画像ボタンにはレイアウトのvを使用してください。onCreateViewに移動してください。 calendarButt = (ImageButton) v.findViewById(R.id.calendar)