android图片查看器，List<T> 泛型集合

最新推荐文章于 2021-05-29 06:58:15 发布

宋鹏飞_

最新推荐文章于 2021-05-29 06:58:15 发布

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本文链接：https://blog.youkuaiyun.com/qq_29849667/article/details/62881143

本文介绍了一个强大的图片查看器组件，支持直接传入实体类对象显示图片，并提供了灵活的数据处理方式和丰富的交互功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

以前使用照片查看器时，将PhotoViewDialog中传入List<String> ，外部传入时遍历一遍数据，代码量很大，使用泛型，并且指定哪个字段是url，哪个字段是图片name。

PhotoViewDialog

/**
 * Created by Sick on 2017/2/17.
 * <p>
 * 十分强大的图片查看器，直接传入实体类对象就可以，对象中的url在Tlistener中设置
 * <p>
 * 图片查看器直接传入实体类Entity
 * 必须实现的方法，setData 1.两个参数（ArrayList<T>,T）2.一个参数（T）
 * setTListener   此方法必须实现，返回T中的图片url和图片name
 * <p>
 * <p>
 */
public class PhotoViewDialog<T> extends BaseDialogFragment {

    @Bind(R.id.id_vp)
    HackyViewPager mIdVp;
    @Bind(R.id.tv_image_name)
    TextView mTvImageName;
    @Bind(R.id.tv_image_num)
    TextView mTvImageNum;
    @Bind(R.id.iv_back)
    ImageView mIvBack;
    @Bind(R.id.iv_download)
    ImageView mIvDownload;

    private ArrayList<T> tList;
    private T t;
    private PhotoViewAdapter adapter;
    public TListener<T> listener;
    private String TAG = PhotoViewDialog.class.getSimpleName();

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //getActivity().setTheme(com.baoyz.actionsheet.R.style.ActionSheetStyleWeCaiWu);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.dialog_photo_view, container, false);
        ButterKnife.bind(this, view);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mIdVp.setOnPageChangeListener(new PhotoViewOnPagerChangeListener());
        adapter = new PhotoViewAdapter(listener, tList, getActivity());
        adapter.setItemClickListener(new PhotoViewAdapter.VHClickListener() {
            @Override
            public void onPhotoTap(View view, float x, float y) {
                getDialog().dismiss();
            }
        });
        getImageData(tList).subscribe(new Subscriber<ArrayList<T>>() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {
                ToastUtil.showLong("图片查看器发生异常！");
            }

            @Override
            public void onNext(ArrayList<T> ts) {


                mIdVp.setAdapter(adapter);

                if (t != null) {
                    mIdVp.setCurrentItem(tList.indexOf(t));
                    updateUI(tList.indexOf(t));
                } else {
                    mIdVp.setCurrentItem(0);
                    updateUI(0);
                }
            }
        });

    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        ButterKnife.unbind(this);
    }

    @OnClick({R.id.iv_back, R.id.iv_download})
    public void onClick(View view) {
        if (Util.isFastDoubleClick()) {
            return;
        }

        switch (view.getId()) {
            case R.id.iv_back:
                getDialog().dismiss();
                break;
            case R.id.iv_download:
                Glide.with(getActivity())
                        .load(listener.getImageUrl(t))
                        .asBitmap()
                        .into(new SimpleTarget<Bitmap>() {
                            @Override
                            public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
                                if (resource != null)
                                    Util.saveLocalImage(resource, (AppCompatActivity) getActivity());
                            }
                        });
                break;
        }
    }

    /**
     * 刷新UI
     *
     * @param position
     */
    private void updateUI(int position) {
        this.t = tList.get(position);
        mTvImageNum.setText(position + 1 + "/" + tList.size());
        if (listener != null) {
            mTvImageName.setText(listener.getImageName(tList.get(position)));
        }
    }


    /**
     * @param tList list集合
     * @param t     选中的list集合中的某个对象
     * @return
     */
    public PhotoViewDialog setData(ArrayList<T> tList, T t) {
        this.tList = new ArrayList<>();
        this.tList.addAll(tList);
        this.t = t;
        return this;
    }

    /**
     * @param t 含有图片的实体类
     * @return
     */
    public PhotoViewDialog setData(T t) {
        this.tList = new ArrayList<>();
        this.tList.add(t);
        return this;
    }

    /**
     * @param listener 实体类中的
     * @return
     */
    public PhotoViewDialog setTListener(TListener<T> listener) {
        this.listener = listener;
        return this;
    }

    /**
     * viewpager监听
     */
    private class PhotoViewOnPagerChangeListener implements ViewPager.OnPageChangeListener {

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            updateUI(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    }

    /**
     * Rxjava    过滤数据
     *
     * @param tList
     * @return
     */
    public Observable<ArrayList<T>> getImageData(ArrayList<T> tList) {
        return Observable.just(tList).map(new Func1<ArrayList<T>, ArrayList<T>>() {
            @Override
            public ArrayList<T> call(ArrayList<T> humorModels) {
                Iterator<T> iterator = humorModels.iterator();
                while (iterator.hasNext()) {
                    T model = iterator.next();
                    if (listener != null && TextUtils.isEmpty(listener.getImageUrl(model))) {
                        iterator.remove();
                    }
                }
                return tList;
            }
        }).compose(RxUtils.rxSchedulerHelper())
                .compose(this.bindToLifecycle());
    }


}

PhotoViewAdapter

public class PhotoViewAdapter<T> extends PagerAdapter {
    private ArrayList<T> tList;
    public TListener<T> listener;
    private Context mContext;

    public PhotoViewAdapter(TListener<T> listener, ArrayList<T> tList, Context mContext) {
        this.listener = listener;
        this.tList = tList;
        this.mContext = mContext;
    }

    @Override
    public View instantiateItem(ViewGroup container, final int position) {
        PhotoView photoView = new PhotoView(container.getContext());
        photoView.setOnPhotoTapListener(new PhotoViewOnPhotoTapListener());

        photoView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {


                return true;
            }
        });

        if (listener == null) {
            throw new RuntimeException("PhotoViewDialog must be set up a TListener , PhotoViewDialog.setTListener(mListener)!");
        }

        if (listener != null && TextUtils.isEmpty(listener.getImageName(tList.get(position)))) {
            throw new RuntimeException("Tlistener must be set up a attribute !");
        }

        if (listener != null && !TextUtils.isEmpty(listener.getImageUrl(tList.get(position)))) {
            Glide.with(photoView.getContext())
                    .load(listener.getImageUrl(tList.get(position)))
                    .fitCenter()
                    .override(ScreenUtils.getScreenWidth(photoView.getContext()), ScreenUtils.getScreenHeight(photoView.getContext()))
                    .into(photoView);
            container.addView(photoView);
        }

        return photoView;
    }

    @Override
    public int getCount() {
        return tList.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    public interface VHClickListener {

        void onPhotoTap(View view, float x, float y);

    }

    public VHClickListener vhClickListener;

    public void setItemClickListener(VHClickListener vhClickListener) {
        this.vhClickListener = vhClickListener;
    }

    private class PhotoViewOnPhotoTapListener implements PhotoViewAttacher.OnPhotoTapListener {
        @Override
        public void onPhotoTap(View view, float x, float y) {
            if (vhClickListener != null) {
                vhClickListener.onPhotoTap(view, x, y);
            }
        }

        @Override
        public void onOutsidePhotoTap() {

        }
    }
}

布局文件自己写吧记得引入 com.github.chrisbanes:PhotoView:1.3.1

调用方法：

PhotoViewDialog<HumorModel> dialog = new PhotoViewDialog<HumorModel>();
                dialog.setData(humorList, model);
                dialog.setTListener(new TListener<HumorModel>() {
                    @Override
                    public String getImageUrl(HumorModel humorModel) {
                        return humorModel.getImg();//读取实体类中的img字段   图片的url
                    }

                    @Override
                    public String getImageName(HumorModel humorModel) {
                        return humorModel.getHumorUserModel().getUserName() + "(用户名替代图片名)";//图片名
                    }
                });
                dialog.show(getActivity(), "xxxx");