快速开始

1// 读取Asset中的图片
2private static InputStream loadInputStreamFromAssetFile(Context context, String fileName){
3    AssetManager am = context.getAssets();
4    try {
5        return am.open(fileName);
6    } catch (IOException e) {
7        e.printStackTrace();
8    }
9    return null;
10}
11
12private static ByteArrayOutputStream readDataFromInpuStream(InputStream inputStream) {
13    try {
14        ByteArrayOutputStream output = new ByteArrayOutputStream();
15        byte[] buffer = new byte[8192];
16        int bytesRead;
17        while ((bytesRead = inputStream.read(buffer)) != -1) {
18            output.write(buffer, 0, bytesRead);
19        }
20        return output;
21    } catch (IOException e) {
22        e.printStackTrace();
23    }
24    return null;
25}
26
27// 使用百度智能云HEIF图片加载SDK进行解码
28private void decodeImageWithBaidu(byte[] heifData) {
29    ImageView image = mRootView.findViewById(R.id.image_bdcloud);
30    try {
31        // 获取HEIF图片元数据
32        HeifInfo heifInfo = new HeifInfo();
33        HeifDecoder.getInfo(heifData.length, heifData, heifInfo);
34        // 当前仅支持单帧静图解码
35        HeifSize heifSize = heifInfo.getFrameList().get(0);
36        // 获取HEIF图片宽高
37        int width = heifSize.getWidth();
38        int height = heifSize.getHeight();
39        // 创建Android Bitmap
40        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
41        // 将HEIF图片解码为Bitmap
42        HeifDecoder.toRgba(heifData.length, heifData, bitmap);
43    } catch (Exception e) {
44        e.printStackTrace();
45    }
46    return;
47}
48
49// 完整业务流程展示
50private void showLocalImage() {
51    InputStream inputStream = loadInputStreamFromAssetFile(mContext, DEFAULT_LOCAL_IMG_URL);
52    if (inputStream == null) {
53        return;
54    }
55
56    ByteArrayOutputStream baos = readDataFromInpuStream(inputStream);
57    if (baos == null) {
58        return;
59    }
60    
61    byte[] heifData = baos.toByteArray();
62    decodeImageWithBaidu(heifData);
63    
64    try {
65        inputStream.close();
66    } catch (IOException e) {
67        e.printStackTrace();
68    }
69
70    try {
71        baos.close();
72    } catch (IOException e) {
73        e.printStackTrace();
74    }
75    return;
76}