Java 等待 Retrofit enque 执行

是的，您应该在开始前显示一些进度条，然后将其隐藏在onResponse中，然后，您可以显示您的片段，以下是一些代码:

progressBar.setVisibility(View.VISIBLE);
authAPI.registerUser(requestBody).enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(@NonNull Call<ResponseBody> call,
                           @NonNull Response<ResponseBody> response) {
        // Response processing.
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                progressBar.setVisibility(View.GONE); // hide progress bar when response is received
                
                // Replace the current fragment with the new fragment here
                FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                NewFragment newFragment = new NewFragment();
                fragmentTransaction.replace(R.id.fragment_container, newFragment);
                fragmentTransaction.commit();
            }
        });
    }

    @Override
    public void onFailure(@NonNull Call<ResponseBody> call,
                          @NonNull Throwable t) {
        // Failure processing.
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                progressBar.setVisibility(View.GONE); // hide progress bar when response fails
            }
        });
    }
});

使用runOnUiThread的原因是为了确保视图更新和片段事务将在主UI线程上发生，而不是在enqueue操作所在的后台线程上发生，因此它不会引发异常！