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网格图像适配器排序

gridview sorting arrays android java

Dima Bokov · 技术社区 · 6 年前

我用图像构建了一些gridView,一切正常。问题是-当我向适配器添加新映像时-它被添加到堆栈的末尾。 (我自己做了一些事情(正如你在评论中看到的),它会像我想要的那样显示,但是当我点击图片时,我得到了错误的图片):

final ArrayList<String> imgString = new ArrayList<>();
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
        Query query = reference
                .child("user_photos")
                .child(FirebaseAuth.getInstance().getCurrentUser().getUid());
        query.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for ( DataSnapshot singleSnapshot :  dataSnapshot.getChildren()){
                    // photos.add(singleSnapshot.getValue(Photo.class));
                    imgString.add(singleSnapshot.child("postimage").getValue().toString());
                }
                //setup our image grid
                int gridWidth = getResources().getDisplayMetrics().widthPixels;
                int imageWidth = gridWidth/NUM_GRID_COLUMNS;
                gridView.setColumnWidth(imageWidth);

                final ArrayList<String> imgUrls = new ArrayList<String>();
                for(int i = 0; i < imgString.size(); i++){
                    imgUrls.add(imgString.get(i));
//                for(int i = imgString.size()-1; i >=0 ; i--){
//                    imgUrls.add(imgString.get(i));
                }
                GridImageAdapter adapter = new GridImageAdapter(ProfileActivity.this,R.layout.layout_grid_imageview,"", imgUrls);
                gridView.setAdapter(adapter);



                gridView.setOnItemClickListener(new AdapterView.OnItemClickListener()
                {
                    @Override
                    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                        PostKey=imgString.get(i);
                        Intent intent = new Intent(ProfileActivity.this, ViewPostActivity.class);
                        intent.putExtra("PostKey_profile",PostKey);
                        startActivity(intent);
                        finish();
                    }
                });
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Log.d(TAG, "onCancelled: query cancelled.");
            }
        });
    }

1 回复 | 直到 6 年前

navylover 6 年前

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    PostKey=imgString.get(i);//here i is the position of the view in the adapter.

正如你所做的:

for(int i = imgString.size()-1; i >=0 ; i--){
              imgUrls.add(imgString.get(i));//imgUrls.get(0) stored imgString.get(imgString.size()-1)

imgString.get(0) ,但是 imgString.get(imgString.size()-1) .

试试这个:

PostKey=imgString.get(imgString.size()-1-i);