android.content.Context#MODE_WORLD_READABLE源码实例Demo

private Uri getApkUri(String path) {

            // Before N, a MODE_WORLD_READABLE file could be passed via the ACTION_INSTALL_PACKAGE
            // Intent. Since N, MODE_WORLD_READABLE files are forbidden, and a FileProvider is
            // recommended.
            boolean useFileProvider = Build.VERSION.SDK_INT >= Build.VERSION_CODES.N;

           // String tempFilename = "tmp.apk";
         //   byte[] buffer = new byte[16384];
            int fileMode = useFileProvider ? Context.MODE_PRIVATE : Context.MODE_WORLD_READABLE;
          /*  try (InputStream is = new FileInputStream(new File(path));
                 FileOutputStream fout = context.openFileOutput(tempFilename, fileMode)) {

                int n;
                while ((n = is.read(buffer)) >= 0) {
                    fout.write(buffer, 0, n);
                }

            } catch (IOException e) {
                Log.i(TAG + ":getApkUri", "Failed to write temporary APK file", e);
            }*/

            if (useFileProvider) {
             //   File toInstall = new File(context.getFilesDir(), tempFilename);
                File toInstall = new File(path);
                return FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID+".provider", toInstall);
            } else {
                return Uri.fromFile(new File(path));
            }
        }
 

@SuppressWarnings("deprecation")
@SuppressLint({"WorldReadableFiles", "WorldWriteableFiles"})
public static void setFilePermissionsFromMode(String name, int mode) {
    int perms = FileUtils.S_IRUSR | FileUtils.S_IWUSR
            | FileUtils.S_IRGRP | FileUtils.S_IWGRP;
    if ((mode & Context.MODE_WORLD_READABLE) != 0) {
        perms |= FileUtils.S_IROTH;
    }
    if ((mode & Context.MODE_WORLD_WRITEABLE) != 0) {
        perms |= FileUtils.S_IWOTH;
    }
    FileUtils.setPermissions(name, perms, -1, -1);
}