Android ClassCastException:AblistView$LayoutParams不能强制转换为Gallery$LayoutParams
我正在尝试开发一款Android 3.1平板电脑应用程序 这个应用程序将有很多图像,我已经按照教程进行了操作,但我做了一些错误的事情,因为我得到了: java.lang.ClassCastException:android.widget.AblistView$LayoutParams不能强制转换为android.widget.Gallery$LayoutParams 这是我的代码: 我在活动中设置了图库Android ClassCastException:AblistView$LayoutParams不能强制转换为Gallery$LayoutParams,android,android-asynctask,android-gallery,Android,Android Asynctask,Android Gallery,我正在尝试开发一款Android 3.1平板电脑应用程序 这个应用程序将有很多图像,我已经按照教程进行了操作,但我做了一些错误的事情,因为我得到了: java.lang.ClassCastException:android.widget.AblistView$LayoutParams不能强制转换为android.widget.Gallery$LayoutParams 这是我的代码: 我在活动中设置了图库 mFactGallery = (Gallery)mView.findViewById(R.i
mFactGallery = (Gallery)mView.findViewById(R.id.factGallery);
mFactGallery.setAdapter(new ImageGalleryAdapter(mActivity, ImageView.ScaleType.FIT_END, 180, 90));
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);
}
}
}
}
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();
}
}
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;
}
}
公共类ImageGalleryAdapter扩展了BaseAdapter
{
私人律师事务所;
私有上下文;
私人英特姆维兹;
私营机构;
公共阵列列表getmImagesPath()
{
返回mImagesPath;
}
public void setmImagesPath(数组列表mImagesPath)
{
this.mImagesPath=mImagesPath;
}
公共无效添加图像(字符串图像路径)
{
mImagesPath.add(图像路径);
}
公共ImageGalleryAdapter(上下文上下文,ImageView.ScaleType ScaleType,int-width,int-height)
{
mContext=上下文;
mWidth=宽度;
mHeight=高度;
mScaleType=scaleType;
mImagesPath=newarraylist();
}
@凌驾
public int getCount()
{
返回mImagesPath.size();
}
@凌驾
公共对象getItem(int位置)
{
返回位置;
}
@凌驾
公共长getItemId(int位置)
{
返回位置;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图)
{
//获取显示图像数据的视图
图像视图图像视图;
//如果没有回收,初始化一些属性
if(convertView==null)
{
imageView=新的imageView(mContext);
imageView.setScaleType(imageView.ScaleType.CENTER\U裁剪);
imageView.setLayoutParams(新的GridView.LayoutParams(
LayoutParams.MATCH_父级,LayoutParams.MATCH_父级);
}
其他的
{
imageView=(imageView)convertView;
//循环位图。
位图bm=((BitmapDrawable)imageView.getDrawable()).getBitmap();
如果(bm!=null)
bm.recycle();
}
字符串filePath=mImagesPath.get(位置);
if(BitmapTools.cancelPotentialWork(文件路径、图像视图))
{
String[]params={filePath,Integer.toString(mWidth),Integer.toString(mHeight)};
最终BitmapWorkerTask任务=新的BitmapWorkerTask(imageView);
最终异步可绘制异步可绘制=
新的AsyncDrawable(mContext.getResources(),文件路径,任务);
setImageDrawable(asyncDrawable);
task.execute(params);
}
返回图像视图;
}
}
BitmapWorkerTask.javamFactGallery = (Gallery)mView.findViewById(R.id.factGallery);
mFactGallery.setAdapter(new ImageGalleryAdapter(mActivity, ImageView.ScaleType.FIT_END, 180, 90));
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);
}
}
}
}
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();
}
}
公共类BitmapWorkerTask扩展异步任务
{
私有最终WeakReference imageViewReference;
公共字符串imgPath=“”;
公共位图工作任务(ImageView ImageView){
//使用WeakReference确保可以对ImageView进行垃圾收集
imageViewReference=新的WeakReference(imageView);
}
//在背景中解码图像。
@凌驾
受保护位图doInBackground(字符串…参数)
{
imgPath=params[0];
int width=Integer.valueOf(参数[1]).intValue();
int height=Integer.valueOf(参数[2]).intValue();
返回BitmapTools.decodeSampledBitmapFromDisk(imgPath,width,height);
}
//完成后,查看ImageView是否仍然存在并设置位图。
@凌驾
受保护的void onPostExecute(位图)
{
如果(isCancelled())
{
位图=空;
}
if(imageViewReference!=null&&bitmap!=null)
{
最终ImageView=imageViewReference.get();
最终位图工作任务位图工作任务=
getBitmapWorkerTask(imageView);
if(this==bitmapWorkerTask&&imageView!=null)
{
设置图像位图(位图);
}
}
}
}
AsyncDrawable.javamFactGallery = (Gallery)mView.findViewById(R.id.factGallery);
mFactGallery.setAdapter(new ImageGalleryAdapter(mActivity, ImageView.ScaleType.FIT_END, 180, 90));
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);
}
}
}
}
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();
}
}
公共类AsyncDrawable扩展了BitmapDrawable
{
私有最终WeakReference位图工作区taskreference;
公共AsyncDrawable(资源、字符串文件路径、,
位图工作任务(位图工作任务)
{
super(res,filepath);
bitmapWorkerTaskReference=
新的WeakReference(位图工作任务);
}
公共BitmapWorkerTask getBitmapWorkerTask()
{
返回bitmapWorkerTaskReference.get();
}
}
我做错了什么?在ImageGalleryAdapter.java中,这是错误的:
imageView.setLayoutParams(new GridView.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
使用正确的LayoutParams类,它应该是
imageView.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
(LayoutParams的超类是
Gallery
而不是GridView
)将GridView.LayoutParams
替换为Gallery.LayoutParams
,如下所示,这将解决您的问题
imageView.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
我们需要另一只眼睛来发现代码中的错误。谢谢你的回答。你能帮点忙吗?我们需要另一只眼睛来发现代码中的错误。谢谢你的回答。我也有同样的问题