如何在后台线程中使用RX从android中的资产文件夹读取文件

Question

private ModelObject model;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {

    }

    private void readFile() {
        if (model == null) {
            Gson gson = new Gson();
            final String helpItem = “my _file.json”;
            InputStream stream = null;
            try {
                stream = getResources().getAssets().open(helpItem);
                Reader reader = new InputStreamReader(stream);
                model = gson.fromJson(reader, ModelObjects.class);
                reader.close();
                stream.close();
            } catch (IOException e) {
                Timber.w(e);
            } finally {
                fileclose();
            }
        }
    }

这是我使用此代码的代码我正在从资产文件夹读取文件并解析为模型对象但我想在后台线程而不是主线程中读取此文件因此并获取数据主线程请建议我如何在后台实现读取文件线程并在主线程中获取值。

Answer 1

你可以这样做Observable：

Observable.fromCallable(new Callable<ModelObject>() {
      @Override public ModelObject call() throws Exception {
        return readFile(); // Make readFile so that it returns ModelObject
      }
    })
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Observer<ModelObject>() {
          @Override public void onSubscribe(Disposable d) {

          }

          @Override public void onNext(ModelObject o) {

          }

          @Override public void onError(Throwable e) {

          }

          @Override public void onComplete() {

          }
        });