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我试图使用HashMap来填充我的GridView但我面临这样的问题:在使用此代码从火力点数据(书籍信息)和填充我的GridView我得到一个填充的GridView随着火力地堡使用的Hashmap
空网格视图:
mDatabasee = FirebaseDatabase.getInstance().getReference();
mDatabasee.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot : snapshot.child("Items").getChildren()) {
Item person = postSnapshot.getValue(Item.class);
Log.d("picture",person.getBookImage());
hm.put(postSnapshot.getKey().toString(),person.getBookImage());
String number = String.valueOf(hm.size());
Log.d("count",number);
这Log.d返回数:1酷似我在火力
}
for(Map.Entry m:hm.entrySet()){
System.out.println(m.getKey()+" "+m.getValue());
}
}
public void onCancelled(DatabaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
String number = String.valueOf(hm.size());
Log.d("css css css",number);
gridView.setAdapter(new ImageAdapter(this, hm));
最后Log.d回报 “的CSS的CSS CSS 0" 所以这是正常的,我收到一个空的网格视图,以确保我有手动添加1本书使新的代码变成:
hm.put("-KWyZJM9GhhTe1PzuJMh","http://books.google.com/books/content?id=aJeTCgAAQBAJ&printsec=frontcover&img=1&zoom=1&source=gbs_api");
String number = String.valueOf(hm.size());
Log.d("css css css",number);
gridView.setAdapter(new ImageAdapter(this, hm));
手动添加这本书我能填充后的GridView –