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微信小程序：电商源码

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微信小程序：电商源码

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android中ExpandableListView用法的一个简单实例附效果图
喜欢显示好友QQ那样的列表，可以展开，可以收起，在android中，以往用的比较多的是listview，虽然可以实现列表的展示，但在某些情况下，我们还是希望用到可以分组并实现收缩的列表，那就要用到android的ExpandableListView，今天研究了一下这个的用法，也参考了很多资料动手写了一个小demo，实现了基本的功能，但界面优化方面做得还不够好，有待改进，素材采用了Q版三国杀武将的图片，很有爱哈哈，下面直接上效果图以及源代码~！

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【核心代码】 public interface CameraSource { static final String LOG_TAG = "camera"; /** * Open the camera source for subsequent use via calls to capture(). * * @return true if the camera source was successfully opened. */ boolean open(); /** * Close the camera source. Calling close on a closed CameraSource is * permitted but has no effect. The camera source may be reopened after * being closed. */ void close(); /** * The width of the captured image. * * @return the width of the capture in pixels */ int getWidth(); /** * The height of the captured image. * * @return the height of the capture in pixels */ int getHeight(); /** * Attempts to render the current camera view onto the supplied canvas. * The capture will be rendered into the rectangle (0,0,width,height). * Outstanding transformations on the canvas may alter this. * * @param canvas the canvas to which the captured pixel data will be written * @return true iff a frame was successfully written to the canvas */ boolean capture(Canvas canvas); boolean saveImage(String savePath, String fileName); }

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or " MediaStore.Images.Media.MIME_TYPE "=?", new String[] { "image/jpeg", "image/png" }, MediaStore.Images.Media.DATE_MODIFIED); Log.e("TAG", mCursor.getCount() ""); while (mCursor.moveToNext()) { // 获取图片的路径 String path = mCursor.getString(mCursor .getColumnIndex(MediaStore.Images.Media.DATA)); Log.e("TAG", path); // 拿到第一张图片的路径 if (firstImage == null) firstImage = path; // 获取该图片的父路径名 File parentFile = new File(path).getParentFile(); if (parentFile == null) continue; String dirPath = parentFile.getAbsolutePath(); ImageFloder imageFloder = null; // 利用一个HashSet防止多次扫描同一个文件夹（不加这个判断，图片多起来还是相当恐怖的~~） if (mDirPaths.contains(dirPath)) { continue; } else { mDirPaths.add(dirPath); // 初始化imageFloder imageFloder = new ImageFloder(); imageFloder.setDir(dirPath); imageFloder.setFirstImagePath(path); } int picSize = parentFile.list(new FilenameFilter() { @Override public boolean accept(File dir, String filename) { if (filename.endsWith(".jpg") || filename.endsWith(".png") || filename.endsWith(".jpeg")) return true; return false; } }).length; totalCount = picSize; imageFloder.setCount(picSize); mImageFloders.add(imageFloder); if (picSize > mPicsSize) { mPicsSize = picSize; mImgDir = parentFile; } } mCursor.close(); // 扫描完成，辅助的HashSet也就可以释放内存了 mDirPaths = null; // 通知Handler扫描图片完成 mHandler.sendEmptyMessage(0x110); } }).start(); } /** * 初始化View */ private void initView() { mGirdView = (GridView) findViewById(R.id.id_gridView); mChooseDir = (TextView) findViewById(R.id.id_choose_dir); mImageCount = (TextView) findViewById(R.id.id_total_count); mBottomLy = (RelativeLayout) findViewById(R.id.id_bottom_ly); } private void initEvent() { /** * 为底部的布局设置点击事件，弹出popupWindow */ mBottomLy.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mListImageDirPopupWindow .setAnimationStyle(R.style.anim_popup_dir); mListImageDirPopupWindow.showAsDropDown(mBottomLy, 0, 0); // 设置背景颜色变暗 WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.alpha = .3f; getWindow().setAttributes(lp); } }); } @Override public void selected(ImageFloder floder) { mImgDir = new File(floder.getDir()); mImgs = Arrays.asList(mImgDir.list(new FilenameFilter() { @Override public boolean accept(File dir, String filename) { if (filename.endsWith(".jpg") || filename.endsWith(".png") || filename.endsWith(".jpeg")) return true; return false; } })); /** * 可以看到文件夹的路径和图片的路径分开保存，极大的减少了内存的消耗； */ mAdapter = new MyAdapter(getApplicationContext(), mImgs, R.layout.grid_item, mImgDir.getAbsolutePath()); mGirdView.setAdapter(mAdapter); // mAdapter.notifyDataSetChanged(); mImageCount.setText(floder.getCount() "张"); mChooseDir.setText(floder.getName()); mListImageDirPopupWindow.dismiss(); }}

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微信小程序：电商源码

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