安卓10（Android10\API29）保存图片到相册DCIM/Camera

大家都知道Android10最大的变化可能就是Scoped Storage（分区存储）。对于把图片保存到相册的应用，影响就大了，因为这个功能在Android10的手机上就会出现异常了，今天就来说说如何兼容Android10保存图片到相册。

1、要存储权限

 protected void save() {AndPermission.with(getContext()).runtime().permission(Permission.WRITE_EXTERNAL_STORAGE,Permission.READ_EXTERNAL_STORAGE).onGranted(permissions -> {Object uri = urls.get(isInfinite ? position % urls.size() : position);//图片地址saveNetPic(getContext(),uri);position));}).onDenied(permissions -> {ToastUtil.showLong("权限被拒绝！");}).start();}

2、保存到本应用的文件目录下，这个步骤不需要权限

 private void saveNetPic(final Context mContext,Object uri){final Handler mainHandler = new Handler(Looper.getMainLooper());final ExecutorService executor = Executors.newSingleThreadExecutor();executor.execute(new Runnable() {@Overridepublic void run() {File source = imageLoader.getImageFile(mContext, uri);try {//1. create pathString dirPath = mContext.getExternalFilesDir(Environment.DIRECTORY_PICTURES).getAbsolutePath();File dirFile = new File(dirPath);if (!dirFile.exists()) dirFile.mkdirs();ImageType type = ImageHeaderParser.getImageType(new FileInputStream(source));String ext = getFileExt(type);final File target = new File(dirPath, System.currentTimeMillis() + "." + ext);if (target.exists()) target.delete();target.createNewFile();//2. save，保存到本应用目录writeFileFromIS(target, new FileInputStream(source));//3. notifyMediaScannerConnection.scanFile(mContext, new String[]{target.getAbsolutePath()},new String[]{"image/" + ext}, new MediaScannerConnection.OnScanCompletedListener() {@Overridepublic void onScanCompleted(final String path, Uri uri) {mainHandler.post(new Runnable() {@Overridepublic void run() {Toast.makeText(mContext, "已保存到相册！", Toast.LENGTH_SHORT).show();//4.保存到相册try {Bitmap bitmap = BitmapFactory.decodeFile(target.getAbsolutePath());saveBitmap(getContext(),bitmap);} catch (Exception e) {e.printStackTrace();}}});}});} catch (IOException e) {e.printStackTrace();}}});}

3、通过SAF的方式保存文件到任意位置

 public void saveBitmap(Context context, Bitmap  bitmap) {ContentValues values = new ContentValues();values.put(MediaStore.Images.Media.DESCRIPTION, "This is an image");values.put(MediaStore.Images.Media.DISPLAY_NAME, "Image.png");values.put(MediaStore.Images.Media.MIME_TYPE, "image/png");values.put(MediaStore.Images.Media.TITLE, System.currentTimeMillis()+".png");values.put(MediaStore.Images.Media.RELATIVE_PATH, "DCIM/Camera");Uri external = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;ContentResolver resolver = context.getContentResolver();Uri insertUri = resolver.insert(external, values);OutputStream os = null;if (insertUri != null) {try {os = resolver.openOutputStream(insertUri);bitmap.compress(Bitmap.CompressFormat.PNG, 90, os);} catch (IOException e) {e.printStackTrace();}finally {try {if (os != null) {os.close();}} catch (IOException e) {e.printStackTrace();}}}}

其中写入文件流和判断图片格式的代码如下：
写入文件流

    private static boolean writeFileFromIS(final File file, final InputStream is) {OutputStream os = null;try {os = new BufferedOutputStream(new FileOutputStream(file));byte data[] = new byte[8192];int len;while ((len = is.read(data, 0, 8192)) != -1) {os.write(data, 0, len);}return true;} catch (IOException e) {e.printStackTrace();return false;} finally {try {is.close();} catch (IOException e) {e.printStackTrace();}try {if (os != null) {os.close();}} catch (IOException e) {e.printStackTrace();}}}

判断图片类型：

private static String getFileExt(ImageType type) {switch (type) {case GIF:return "gif";case PNG:case PNG_A:return "png";case WEBP:case WEBP_A:return "webp";case JPEG:return "jpeg";}return "jpeg";}

还有个ImageHeaderParser来至 XPopup

import static com.lxj.xpopup.enums.ImageType.GIF;
import static com.lxj.xpopup.enums.ImageType.JPEG;
import static com.lxj.xpopup.enums.ImageType.PNG;
import static com.lxj.xpopup.enums.ImageType.PNG_A;
import static com.lxj.xpopup.enums.ImageType.UNKNOWN;/*** Date: 2020/3/24* author: SmallCake*/
public class ImageHeaderParser {private static final int GIF_HEADER = 0x474946;private static final int PNG_HEADER = 0x89504E47;static final int EXIF_MAGIC_NUMBER = 0xFFD8;// WebP-related// "RIFF"private static final int RIFF_HEADER = 0x52494646;// "WEBP"private static final int WEBP_HEADER = 0x57454250;// "VP8" null.private static final int VP8_HEADER = 0x56503800;private static final int VP8_HEADER_MASK = 0xFFFFFF00;private static final int VP8_HEADER_TYPE_MASK = 0x000000FF;// 'X'private static final int VP8_HEADER_TYPE_EXTENDED = 0x00000058;// 'L'private static final int VP8_HEADER_TYPE_LOSSLESS = 0x0000004C;private static final int WEBP_EXTENDED_ALPHA_FLAG = 1 << 4;private static final int WEBP_LOSSLESS_ALPHA_FLAG = 1 << 3;public static ImageType getImageType(InputStream is) throws IOException{Reader reader = new StreamReader(is);final int firstTwoBytes = reader.getUInt16();// JPEG.if (firstTwoBytes == EXIF_MAGIC_NUMBER) {return JPEG;}final int firstFourBytes = (firstTwoBytes << 16 & 0xFFFF0000) | (reader.getUInt16() & 0xFFFF);// PNG.if (firstFourBytes == PNG_HEADER) {// See: http://stackoverflow.com/questions/2057923/how-to-check-a-png-for-grayscale-alpha// -color-typereader.skip(25 - 4);int alpha = reader.getByte();// A RGB indexed PNG can also have transparency. Better safe than sorry!return alpha >= 3 ? PNG_A : PNG;}// GIF from first 3 bytes.if (firstFourBytes >> 8 == GIF_HEADER) {return GIF;}// WebP (reads up to 21 bytes). See https://developers.google.com/speed/webp/docs/riff_container// for details.if (firstFourBytes != RIFF_HEADER) {return UNKNOWN;}// Bytes 4 - 7 contain length information. Skip these.reader.skip(4);final int thirdFourBytes =(reader.getUInt16() << 16 & 0xFFFF0000) | (reader.getUInt16() & 0xFFFF);if (thirdFourBytes != WEBP_HEADER) {return UNKNOWN;}final int fourthFourBytes =(reader.getUInt16() << 16 & 0xFFFF0000) | (reader.getUInt16() & 0xFFFF);if ((fourthFourBytes & VP8_HEADER_MASK) != VP8_HEADER) {return UNKNOWN;}if ((fourthFourBytes & VP8_HEADER_TYPE_MASK) == VP8_HEADER_TYPE_EXTENDED) {// Skip some more length bytes and check for transparency/alpha flag.reader.skip(4);return (reader.getByte() & WEBP_EXTENDED_ALPHA_FLAG) != 0 ? ImageType.WEBP_A : ImageType.WEBP;}if ((fourthFourBytes & VP8_HEADER_TYPE_MASK) == VP8_HEADER_TYPE_LOSSLESS) {// See chromium.googlesource.com/webm/libwebp/+/master/doc/webp-lossless-bitstream-spec.txt// for more info.reader.skip(4);return (reader.getByte() & WEBP_LOSSLESS_ALPHA_FLAG) != 0 ? ImageType.WEBP_A : ImageType.WEBP;}is.close();return ImageType.WEBP;}private interface Reader {int getUInt16() throws IOException;short getUInt8() throws IOException;long skip(long total) throws IOException;int read(byte[] buffer, int byteCount) throws IOException;int getByte() throws IOException;}private static final class StreamReader implements Reader {private final InputStream is;// Motorola / big endian byte order.StreamReader(InputStream is) {this.is = is;}@Overridepublic int getUInt16() throws IOException {return (is.read() << 8 & 0xFF00) | (is.read() & 0xFF);}@Overridepublic short getUInt8() throws IOException {return (short) (is.read() & 0xFF);}@Overridepublic long skip(long total) throws IOException {if (total < 0) {return 0;}long toSkip = total;while (toSkip > 0) {long skipped = is.skip(toSkip);if (skipped > 0) {toSkip -= skipped;} else {// Skip has no specific contract as to what happens when you reach the end of// the stream. To differentiate between temporarily not having more data and// having finished the stream, we read a single byte when we fail to skip any// amount of data.int testEofByte = is.read();if (testEofByte == -1) {break;} else {toSkip--;}}}return total - toSkip;}@Overridepublic int read(byte[] buffer, int byteCount) throws IOException {int toRead = byteCount;int read;while (toRead > 0 && ((read = is.read(buffer, byteCount - toRead, toRead)) != -1)) {toRead -= read;}return byteCount - toRead;}@Overridepublic int getByte() throws IOException {return is.read();}}
}

参考：
OPPO - Android Q版本应用兼容性适配指导

作者：Small_Cake
链接：https://www.jianshu.com/p/cd9e58d1f8b9
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

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