[移动开发]部分华为手机FileProvider.getUriForFile报错

部分用户反馈华为手机（P30，Mate20等）在分享文件时报错：Failed to find configured root that contains /storage/emulated/0/...。但是公司自己的测试机又不会出现问题。经过一番摸索解决方案如下：

private static final String HUAWEI_MANUFACTURER = "Huawei";

public static Uri getUriForFile(Context context, File file) {
    String authority = context.getPackageName() + ".fileprovider";
    if (Build.VERSION.SDK_INT >= 24) {
        if (HUAWEI_MANUFACTURER.equalsIgnoreCase(Build.MANUFACTURER)) {
            try {
                return FileProvider.getUriForFile(context, authority, file);
            } catch (IllegalArgumentException e) {
                final File cacheFolder = new File(context.getCacheDir(), HUAWEI_MANUFACTURER);
                if (!cacheFolder.exists()) cacheFolder.mkdirs();
                final File cacheLocation = new File(cacheFolder, file.getName());
                if (cacheLocation.exists()) cacheLocation.delete();
                try {
                    FileHelps.copy(file.getAbsolutePath(), cacheLocation.getAbsolutePath());
                    return FileProvider.getUriForFile(context, authority, cacheLocation);
                } catch (Exception e1) {
                    throw new IllegalArgumentException("Huawei devices are unsupported for Android N", e1);
                }
            }
        } else {
            return FileProvider.getUriForFile(context, authority, file);
        }
    } else {
        return Uri.fromFile(file);
    }
}

public class FileHelps {
    //文件拷贝
    public static boolean copy(String fromFile, String toFile) {
        InputStream fosfrom = null;
        OutputStream fosto = null;
        try {
            fosfrom = new FileInputStream(fromFile);
            fosto = new FileOutputStream(toFile);
            byte[] bt = new byte[1024];
            int c;
            while ((c = fosfrom.read(bt)) > 0) {
                fosto.write(bt, 0, c);
            }
            fosfrom.close();
            fosto.close();
            return true;
        } catch (Exception ex) {
            if (fosfrom != null) {
                try {
                    fosfrom.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fosto != null) {
                try {
                    fosto.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return false;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-files-path name="public-files-path" path="." />
    <cache-path name="private-cache-path" path="." />
</paths>

已经过检测，可以分享成功