请帮忙。我正在寻求将 viewpager 应用到 Gridview 的详细 View 。当您使用本地镜像时,有在线教程,但我想使用从 Parse.com 检索的图像,但我遇到了困难。
主要 fragment :
public class GalleryActivity extends Activity {
private GridView gridView;
private GridViewAdapter gridAdapter;
private int columnWidth;
GridViewAdapter urgentTodosAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photogallery);
final ParseQueryAdapter<ParseObject> mainAdapter;
gridView = (GridView) findViewById(R.id.gridView);
urgentTodosAdapter = new GridViewAdapter(this);
gridView.setAdapter(urgentTodosAdapter);
gridView.setOnScrollListener(new SampleScrollListener(this));
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ParseObject todo = urgentTodosAdapter.getItem(position);
String about = todo.getString("comment");
ParseFile image = todo.getParseFile("image"); //getParseFile() is a method of ParseObject
String imageUrl = image.getUrl();
Intent intent = new Intent("com.package.name.DetailsActivity");
intent.putExtra("id", position);
intent.putExtra("about",about);
intent.putExtra("position",position);
intent.putExtra("image",imageUrl); //pass along imageUrl
startActivity(intent);
}
});
}
GridViewAdapter
:
public class GridViewAdapter extends ParseQueryAdapter<ParseObject> {
ProgressBar progressBar;
ParseImageView todoImage;
String what;
protected ImageLoader imageLoader;
public GridViewAdapter(Context context) {
super(context, new ParseQueryAdapter.QueryFactory<ParseObject>() {
public ParseQuery create() {
ParseQuery query = new ParseQuery("WallImageObject");
// query.whereEqualTo("highPri", true);
query.orderByDescending("createdAt");
// query.setLimit(1000);
return query;
}
});
}
public long getItemId(int position) {
return 0;
}
@Override
public View getItemView(ParseObject object, View v, ViewGroup parent) {
ViewHolder viewHolder;
imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(getContext()));
if (v == null) {
v = View.inflate(getContext(), R.layout.photoisgallery, null);
viewHolder = new ViewHolder();
viewHolder.image = (ParseImageView) v.findViewById(R.id.image);
v.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) v.getTag();
}
ParseFile imageFile = object.getParseFile("image");
if (imageFile != null) {
if (viewHolder.image.getTag() == null ||
!viewHolder.image.getTag().equals(imageFile.getUrl())) {
imageLoader.getInstance().displayImage(imageFile.getUrl(), viewHolder.image, new SimpleImageLoadingListener());
viewHolder.image.setTag(imageFile.getUrl());
}
}
return v;
}
private static class ViewHolder {
ParseImageView image;
TextView title;
}
UDAPTED:DetailsActivity
:根据位置单击,重新调整同一图像三次。
public class DetailsActivity extends Activity {
private static Context context;
private ViewPager pager;
public static int position;
private TouchImageView image;
public static String pic;
Intent getPic;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pagergallery);
// get intent from GalleriesFragment - get selected image
getPic = getIntent();
// get image
pic = getPic.getStringExtra("image");
// get position to open image tapped and display in the pager
position = getPic.getExtras().getInt("id");
Log.d("position = ", +position + "");
pager = (ViewPager) findViewById(R.id.pager);
SwipeImageAdapter swipeAdapter = new SwipeImageAdapter();
pager.setAdapter(swipeAdapter);
pager.setCurrentItem(position);
}
@Override
public void finish() {
super.finish();
}
private class SwipeImageAdapter extends PagerAdapter {
private int[] images = new int[] {
R.drawable.ic_danger,
R.drawable.ic_4,
R.drawable.ic_beycd
};
@Override
public int getCount() {
return images.length;
// return GalleryActivity.todo.g
}
Object getItem(int position){
return position;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Context context = DetailsActivity.this;
ImageView imageView = new ImageView(context);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
// imageView.setImageResource(images[position]);
String url = getPic.getStringExtra("image"); //get the url String
Picasso.with(context).load(url)
.noFade()
.into(imageView);
((ViewPager) container).addView(imageView, 0);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((ImageView) object);
}
}
最佳答案
为了实现您想要的行为,您需要向 PagerAdapter 提供要显示的项目列表。您可以通过创建如下所示的构造函数来做到这一点:
public SwipeImageAdapter(Context context, ArrayList<Image> data) {
this.mContext = context;
this.mData = data;
}
然后使用mData
将数据填充到您的itemView(instantiateItem
方法)
请记住在DetailsActivity
中将setCurrentItem
设置为您的寻呼机
关于java - 使用解析图像从 Gridview 到 ViewPager,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30662618/