android – ClassCastException：AbsListView $LayoutParams无法强制转换为Gallery $LayoutParams

概述我正在尝试开发 Android 3.1平板电脑应用程序. 这个应用程序将有很多图像,我已经按照Processing Bitmaps Off the UI Thread教程,但我做错了,因为我得到： java.lang.ClassCastException：android.widget.AbsListView $LayoutParams无法强制转换为android.widget.Gallery $L 我正在尝试开发 Android 3.1平板电脑应用程序.

这个应用程序将有很多图像,我已经按照Processing Bitmaps Off the UI Thread教程,但我做错了,因为我得到：

java.lang.classCastException：androID.Widget.AbsListVIEw $LayoutParams无法强制转换为androID.Widget.gallery $LayoutParams

这是我的代码：

我在一个Activity上设置了gallery

mFactgallery = (gallery)mVIEw.findVIEwByID(R.ID.factgallery);mFactgallery.setAdapter(new ImagegalleryAdapter(mActivity,ImageVIEw.ScaleType.FIT_END,180,90));

ImagegalleryAdapter.java

public class ImagegalleryAdapter extends BaseAdapter{    private ArrayList<String> mImagesPath;    private Context mContext;    private int mWIDth;    private int mHeight;    public ArrayList<String> getmImagesPath()    {        return mImagesPath;    }    public voID setmImagesPath(ArrayList<String> mImagesPath)    {        this.mImagesPath = mImagesPath;    }    public voID addImage(String imagePath)    {        mImagesPath.add(imagePath);    }    public ImagegalleryAdapter(Context context,ImageVIEw.ScaleType scaleType,int wIDth,int height)    {        mContext = context;        mWIDth = wIDth;        mHeight = height;        mScaleType = scaleType;        mImagesPath = new ArrayList<String>();    }    @OverrIDe    public int getCount()    {        return mImagesPath.size();    }    @OverrIDe    public Object getItem(int position)    {        return position;    }    @OverrIDe    public long getItemID(int position)    {        return position;    }    @OverrIDe    public VIEw getVIEw(int position,VIEw convertVIEw,VIEwGroup parent)    {        // Get a VIEw to display image data                             ImageVIEw imageVIEw;        // if it's not recycled,initialize some attributes        if (convertVIEw == null)        {            imageVIEw = new ImageVIEw(mContext);            imageVIEw.setScaleType(ImageVIEw.ScaleType.CENTER_CROP);            imageVIEw.setLayoutParams(new GrIDVIEw.LayoutParams(                    LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));        }        else        {            imageVIEw = (ImageVIEw) convertVIEw;            // Recicla el Bitmap.            Bitmap bm = ((BitmapDrawable) imageVIEw.getDrawable()).getBitmap();            if (bm != null)                bm.recycle();        }        String filePath = mImagesPath.get(position);        if (BitmapTools.cancelPotentialWork(filePath,imageVIEw))        {            String[] params = {filePath,Integer.toString(mWIDth),Integer.toString(mHeight)};            final BitmapWorkerTask task = new BitmapWorkerTask(imageVIEw);            final AsyncDrawable asyncDrawable =                    new AsyncDrawable(mContext.getResources(),filePath,task);            imageVIEw.setimageDrawable(asyncDrawable);            task.execute(params);        }        return imageVIEw;    }}

BitmapWorkerTask.java

public class BitmapWorkerTask extends AsyncTask<String,VoID,Bitmap>{    private final WeakReference<ImageVIEw> imageVIEwReference;    public String imgPath = "";    public BitmapWorkerTask(ImageVIEw imageVIEw) {        // Use a WeakReference to ensure the ImageVIEw can be garbage collected        imageVIEwReference = new WeakReference<ImageVIEw>(imageVIEw);    }    // Decode image in background.    @OverrIDe    protected Bitmap doInBackground(String... params)    {        imgPath = params[0];        int wIDth = Integer.valueOf(params[1]).intValue();        int height = Integer.valueOf(params[2]).intValue();        return BitmapTools.decodeSampledBitmapFromdisk(imgPath,wIDth,height);    }    // Once complete,see if ImageVIEw is still around and set bitmap.    @OverrIDe    protected voID onPostExecute(Bitmap bitmap)    {        if (isCancelled())        {            bitmap = null;        }        if (imageVIEwReference != null && bitmap != null)        {            final ImageVIEw imageVIEw = imageVIEwReference.get();            final BitmapWorkerTask bitmapWorkerTask =                    BitmapTools.getBitmapWorkerTask(imageVIEw);            if (this == bitmapWorkerTask && imageVIEw != null)            {                imageVIEw.setimageBitmap(bitmap);            }        }    }}

AsyncDrawable.java

public class AsyncDrawable extends BitmapDrawable{    private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;    public AsyncDrawable(Resources res,String filepath,BitmapWorkerTask bitmapWorkerTask)    {        super(res,filepath);        bitmapWorkerTaskReference =            new WeakReference<BitmapWorkerTask>(bitmapWorkerTask);    }    public BitmapWorkerTask getBitmapWorkerTask()    {        return bitmapWorkerTaskReference.get();    }}

我究竟做错了什么？

解决方法 用gallery.LayoutParams替换GrIDVIEw.LayoutParams,如下所示,这将解决您的问题

imageVIEw.setLayoutParams(new gallery.LayoutParams(                    LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));

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