如何在Gallery android中为下一个、上一个视图发送呼叫?
我在画廊里用的是一本书。首先,我为缩略图显示一个网格。当用户单击缩略图图像时,我得到了该位置,并将其传递到一个新的活动,该活动显示LoaderImageView库,该库从internet获取大图像,同时显示ProgressBar 我想做的是,当用户选择一个图像,然后也应该有b自动调用下一个,上一个视图。实际查看并加载图像 我正在尝试使用OnItemSelectedListener来实现这一点 这是密码。但这不是很好。当我滚动上一张图片时,它会转到第一张图片。而且也不符合我的逻辑如何在Gallery android中为下一个、上一个视图发送呼叫?,android,android-widget,android-gallery,Android,Android Widget,Android Gallery,我在画廊里用的是一本书。首先,我为缩略图显示一个网格。当用户单击缩略图图像时,我得到了该位置,并将其传递到一个新的活动,该活动显示LoaderImageView库,该库从internet获取大图像,同时显示ProgressBar 我想做的是,当用户选择一个图像,然后也应该有b自动调用下一个,上一个视图。实际查看并加载图像 我正在尝试使用OnItemSelectedListener来实现这一点 这是密码。但这不是很好。当我滚动上一张图片时,它会转到第一张图片。而且也不符合我的逻辑 class Bi
class BigImageAdapter extends BaseAdapter {
DisplayMetrics displayMatrics;
HashMap<String, Bitmap> hasLargeBitmap;
SharedPhotosData sharedPhotosData;
Context mContext;
public BigImageAdapter(Context contex, SharedPhotosData photoData) {
mContext = contex;
displayMatrics = new DisplayMetrics();
hasLargeBitmap = new HashMap<String, Bitmap>();
getWindowManager().getDefaultDisplay().getMetrics(displayMatrics);
sharedPhotosData = photoData;
}
public void recycleAllBitmap() {
try {
int i = 0;
Collection<Bitmap> temp = hasLargeBitmap.values();
for (Bitmap bitmap : temp) {
if (bitmap != null) {
if (bitmap.isRecycled() == false) {
bitmap.recycle();
i++;
}
}
}
Log.e("Recycled", "No of images recycled"+i);
} catch (Exception e) {
e.printStackTrace();
}
}
public int getCount() {
if (sharedPhotosData != null) {
if (sharedPhotosData.photoData != null) {
return sharedPhotosData.photoData.size();
} else {
Log.e(TAG, "sharedData.photoData is null");
}
} else {
Log.e(TAG, "sharedData is null");
}
return 0;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = null;
try {
MyData curData = null;
curData = sharedPhotosData.photoData.get(position);
if (convertView == null) {
String imagePath = Environment.getExternalStorageDirectory().toString() + SMConstants.FILE_PATH_BASE
+ SMConstants.S3Folders.PHOTO + curData.getLargeURLLocalPath() + "/" + SMConstants.FILE_NAME_PREFIX
+ curData.getFileName();
if (hasLargeBitmap.containsKey(imagePath) == false) {
rowView = new AsynImageView(hasLargeBitmap, PhotoGalleryActivity.this, curData);
} else {
Bitmap image = hasLargeBitmap.get(imagePath);
ImageView mImageView = new ImageView(mContext);
mImageView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
Gravity.CENTER));
mImageView.setImageBitmap(image);
mImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
mImageView.setAdjustViewBounds(true);
rowView = mImageView;
}
rowView.setLayoutParams(new Gallery.LayoutParams(android.view.ViewGroup.LayoutParams.FILL_PARENT,
android.view.ViewGroup.LayoutParams.FILL_PARENT));
} else {
rowView = convertView;
}
} catch (Exception e) {
Log.e("Exception", "LargeSlideShow.GetView Message = " + e);
e.printStackTrace();
} catch (Error e) {
Log.e("Error", "LargeSlideShow.GetView Message = " + e);
e.printStackTrace();
}
return rowView;
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
try {
if (position - 1 >= 0) {
myGalleryForLargeImage.setSelection((position - 1));
}
if (position + 1 < size) {
myGalleryForLargeImage.setSelection((position + 1));
}
} catch (Exception e) {
Log.e(TAG, "Exception = " + e.toString());
e.printStackTrace();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
嗯。我发现我的GalleryforLargeImage.setSelectionposition-1没有执行;必须这样做。现在它尝试获取视图,当getView方法调用它时,它会启动该图像请求
@Override
public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
try {
if (position - 1 >= 0) {
bigImageAdapter.getView(position-1, null, myGalleryForLargeImage);
}
if (position + 1 < size) {
bigImageAdapter.getView(position+1, null, myGalleryForLargeImage);
}
} catch (Exception e) {
Log.e(TAG, "Exception = " + e.toString());
e.printStackTrace();
}
}