Question

我有一个viewpager。有一个按钮布局。当用户点击它时，它应该从当前图像中提供数据。但是它给出了下一张图片的标题。

 @Override
    public Object instantiateItem(ViewGroup container, int position) {

        layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.image_fullscreen_preview, container, false);

        imageViewPreview = (ImageView) view.findViewById(R.id.image_preview);
        imageViewPreview.setOnTouchListener(new ImageMatrixTouchHandler(view.getContext()));
        Photos image = images.get(position);

        img_title = image.getTitle();


        Glide.with(getActivity())
                .load(image.getUrl())
                .thumbnail(Glide.with(getActivity()).load(R.drawable.loader))
                .fitCenter()
                .crossFade()
                .into(imageViewPreview);
        Button  save_img = (Button) view.findViewById(R.id.save_img);
        save_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Toast.makeText(getActivity(), img_title, Toast.LENGTH_SHORT).show();
            }
        });
        share_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                shareImage(view);
            }
        });


        container.addView(view);
        return view;

    }

如何从当前图片中获取标题？

Answer 1

因为ViewPager初始化三个对象：当前位置的对象，前一个位置的对象和下一个位置的对象。而且我看到你每次更新img_title并且对象正在初始化

img_title = image.getTitle();

你要做的就是把它变成一个局部变量：

@Override
    public Object instantiateItem(ViewGroup container, int position) {

        layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.image_fullscreen_preview, container, false);

        imageViewPreview = (ImageView) view.findViewById(R.id.image_preview);
        imageViewPreview.setOnTouchListener(new ImageMatrixTouchHandler(view.getContext()));
        Photos image = images.get(position);

        final String img_title = image.getTitle();


        Glide.with(getActivity())
                .load(image.getUrl())
                .thumbnail(Glide.with(getActivity()).load(R.drawable.loader))
                .fitCenter()
                .crossFade()
                .into(imageViewPreview);
        Button  save_img = (Button) view.findViewById(R.id.save_img);
        save_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Toast.makeText(getActivity(), img_title, Toast.LENGTH_SHORT).show();
            }
        });
        share_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                shareImage(view);
            }
        });


        container.addView(view);
        return view;

    }

在buttonclick上从viewpager获取图像和标题

1 个答案: