加載圖像

我有麻煩使用通用的圖像加載程序庫從自定義網址獲取圖像中的片段，這裏是我使用的代碼：我不知道爲什麼它不工作，因爲它應該工作。任何建議的幫助將不勝感激！加載圖像

最好的問候，

public class Fragment2 extends Fragment { 

public Fragment2(){} 

String[] imageUrls; 
AbsListViewBaseActivity aa = new AbsListViewBaseActivity(); 

DisplayImageOptions options; 

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

    View rootView = inflater.inflate(R.layout.fragment2, container, false); 

    Bundle bundle = getActivity().getIntent().getExtras(); 
    imageUrls = bundle.getStringArray(Extra.IMAGES); 

    options = new DisplayImageOptions.Builder() 
     .showImageOnLoading(R.drawable.ic_stub) 
     .showImageForEmptyUri(R.drawable.ic_empty) 
     .showImageOnFail(R.drawable.ic_error) 
     .cacheInMemory(true) 
     .cacheOnDisc(true) 
     .considerExifParams(true) 
     .bitmapConfig(Bitmap.Config.RGB_565) 
     .build(); 

    aa.listView = (GridView) rootView.findViewById(R.id.gridview); 
    ((GridView) aa.listView).setAdapter(new ImageAdapter()); 
    aa.listView.setOnItemClickListener(new OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      startImagePagerActivity(position); 
     } 

    }); 
    return rootView; 
} 

private void startImagePagerActivity(int position) { 
    Intent intent = new Intent(getActivity(), ImagePagerActivity.class); 
    intent.putExtra(Extra.IMAGES, imageUrls); 
    intent.putExtra(Extra.IMAGE_POSITION, position); 
    startActivity(intent); 
} 

public class ImageAdapter extends BaseAdapter { 
    @Override 
    public int getCount() { 
     return imageUrls.length; 
    } 

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

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     final ViewHolder holder; 
     View view = convertView; 
     if (view == null) { 
      view = getActivity().getLayoutInflater().inflate(R.layout.item_grid_image, parent, false); 
      holder = new ViewHolder(); 
      assert view != null; 
      holder.imageView = (ImageView) view.findViewById(R.id.image); 
      holder.progressBar = (ProgressBar) view.findViewById(R.id.progress); 
      view.setTag(holder); 
     } else { 
      holder = (ViewHolder) view.getTag(); 
     } 

     aa.imageLoader.displayImage(imageUrls[position], holder.imageView, options, new SimpleImageLoadingListener() { 
            @Override 
            public void onLoadingStarted(String imageUri, View view) { 
             holder.progressBar.setProgress(0); 
             holder.progressBar.setVisibility(View.VISIBLE); 
            } 

            @Override 
            public void onLoadingFailed(String imageUri, View view, 
              FailReason failReason) { 
             holder.progressBar.setVisibility(View.GONE); 
            } 

            @Override 
            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { 
             holder.progressBar.setVisibility(View.GONE); 
            } 
           }, new ImageLoadingProgressListener() { 
            @Override 
            public void onProgressUpdate(String imageUri, View view, int current, 
              int total) { 
             holder.progressBar.setProgress(Math.round(100.0f * current/total)); 
            } 
           } 
     ); 

     return view; 
    } 

    class ViewHolder { 
     ImageView imageView; 
     ProgressBar progressBar; 
    } 

} 

}

代碼佈局：

<?xml version="1.0" encoding="utf-8"?> 
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/gridview" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:gravity="center" 
android:horizontalSpacing="4dip" 
android:numColumns="3" 
android:stretchMode="columnWidth" 
android:verticalSpacing="4dip" 
android:padding="4dip" />

和清單文件：

<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.SET_DEBUG_APP"></uses-permission> 

<application 
    android:name="MyApplication" 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.example.loadimage.SplashScreen" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
     <activity 
     android:name="zeal.kingdom.koreamania.Fragment1" 
     android:label="@string/app_name" > 
    </activity> 
<activity 
     android:name="com.example.loadimage.Fragment2" 
     android:label="@string/app_name" > 
    </activity> 
    <activity 
     android:name="com.example.loadimage.Fragment3" 
     android:label="@string/app_name" > 
    </activity> 
    <activity 
     android:name="com.example.loadimage.Fragment4" 
     android:label="@string/app_name" > 
    </activity> 
      <activity 
     android:name="com.example.loadimage.Fragment5" 
     android:label="@string/app_name" > 
    </activity> 
    <activity 
     android:name="com.example.loadimage.Fragment6" 
     android:label="@string/app_name"  
android:configChanges="locale|orientation|keyboardHidden" 
android:noHistory="true" > 
    </activity> 

      <activity 
     android:name="com.example.loadimage.Fragment7" 
     android:label="@string/app_name" > 
    </activity> 


    <activity 
     android:name="com.example.loadimage.MainActivity" 
     android:label="@string/app_name" > 
    </activity> 

</application>

日誌貓：

Thread [<1> main] (Suspended (exception NullPointerException)) 
<VM does not provide monitor information> 
Fragment2.onCreateView(LayoutInflater, ViewGroup, Bundle) line: 42 
Fragment2(Fragment).performCreateView(LayoutInflater, ViewGroup, Bundle) line: 1700 
FragmentManagerImpl.moveToState(Fragment, int, int, int, boolean) line: 890 
FragmentManagerImpl.moveToState(int, int, int, boolean) line: 1062 
BackStackRecord.run() line: 684 
FragmentManagerImpl.execPendingActions() line: 1447 
FragmentManagerImpl$1.run() line: 443 
Handler.handleCallback(Message) line: 733 
Handler.dispatchMessage(Message) line: 95 
Looper.loop() line: 136 
ActivityThread.main(String[]) line: 5017  
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method] 
Method.invoke(Object, Object...) line: 515 
ZygoteInit$MethodAndArgsCaller.run() line: 779 
ZygoteInit.main(String[]) line: 595 
NativeStart.main(String[]) line: not available [native method] 

42: imageUrls = bundle.getStringArray(Extra.IMAGES); 
1700: return onCreateView(inflater, container, savedInstanceState); 
890: f.mView = f.performCreateView(f.getLayoutInflater(
moveToState(f, newState, transit, transitStyle, false);

來源

2014-04-07 Antonin Gavrel

任何答案裏面片段歡迎從互聯網加載的圖片！ –

你如何設置你的'ImageLoader'實例和'RequestQueue'實例？有沒有任何理由你不使用'NetworkImageView'？ –

嗨，亞當，我在此期間切換到通用圖像加載器，希望修復，但仍然出現錯誤。我更新了我使用的代碼:)非常感謝您的幫助！儘管如此，任何在片段中使用gridview的代碼都可以。 –

我onCreateView

imageLoader = ImageLoader.getInstance(); 
imageLoader.init(ImageLoaderConfiguration.createDefault(getActivity())); 

imageUrls = IMAGES;

添加該代碼，並宣佈

import static com.example........app.Constants.IMAGES;

來源

2014-06-19 23:37:42 Walkira

你能解釋一下你的答案，而不是僅僅將代碼粘貼？ – DavidG

連我自己都面臨着同樣的問題。這個問題與Fragment不同。問題是，我在那裏試圖加載圖像的ImageView的寬度和高度爲「WRAP_CONTENT」和環球圖像裝載機將不能接受。所以，我們需要指定寬度和ImageView的高度像「100dp」什麼的。希望它能幫助:)

來源

2015-05-22 14:33:33

回答

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