android - Volley 文件未使用 GSM 下载

Question

我正在使用 Volley 从 AWS 下载文件。文件大小约为 6 MB。在 Android 文档中提到你不应该使用 Volley 下载大文件。那么 Volley 上的文件大小限制是多少？我在模拟器上使用不同的网络类型和信号强度来检查我的应用程序在下载文件时的行为。我主要想检查 GSM 网络类型。如果我将网络类型保持为 GSM，即使我的信号强度很好，我也会超时。如果我的网络类型是 Full 或 LTE，则文件下载速度非常快。对于 GSM，我什至将重试限制增加到 5 分钟，但它仍然让我超时。我不想让重试策略超过 10 秒。这是我的代码。

public class MainActivity extends AppCompatActivity  {

    InputStreamVolleyRequest request;
    private TextView textView;
    private Button button;
    //private RequestQueue requestQueue;
    //WifiManager wifiManager;
     long FILE_SIZE ;
    long startTime;
    long endTime;
    private long takenTime;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.tv);
        button = findViewById(R.id.button);
        String mUrl="my url";
//        wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startTime = System.currentTimeMillis();
                textView.setText("");


                MySingleton.getMySingleton(getApplicationContext()).addToRequestQueue(request);

//                requestQueue.add(request);
                button.setEnabled(false);

            }
        });

//        requestQueue = Volley.newRequestQueue(getApplicationContext());
        request = new InputStreamVolleyRequest(Request.Method.GET, mUrl, new Response.Listener<byte[]>() {
            @Override
            public void onResponse(byte[] response) {
                if(response!=null){
                    FileOutputStream outputStream;


                    String name = "justdownloaded.mp3";

                    try {

                        outputStream = openFileOutput(name, Context.MODE_PRIVATE);

                        outputStream.write(response);

                        outputStream.close();
                        Toast.makeText(MainActivity.this, "Download complete.", Toast.LENGTH_LONG).show();
                        textView.setText("Complete");

                        endTime = System.currentTimeMillis();


                        File file1 = new File(getApplicationContext().getFilesDir().getAbsolutePath(),name);
                        Log.i("TAG", "onResponse: "+MD5.calculateMD5(file1));
                        boolean b =MD5.checkMD5(request.responseHeaderETag,file1);
                        Log.i("TAG", "onResponse: "+b);
                        FILE_SIZE = file1.length();
                        int fileSize = (int) (FILE_SIZE / 1024);

                        takenTime = endTime - startTime;
                        double s = (double) takenTime / 1000;
                        double speed = fileSize / s;
                        Log.i("TAG", "onResponse: "+new DecimalFormat("##.##").format(speed)
                                + "kb/second"+fileSize);

                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    button.setEnabled(true);

                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

                if(error != null){
                    if(error.getClass().equals(TimeoutError.class)){
                        Toast.makeText(getApplicationContext(),"Time Out Error",Toast.LENGTH_LONG).show();
                    }
                }
                endTime = System.currentTimeMillis();

//                Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
                Log.i("TAG", "onErrorResponse: "+error.networkResponse);
                Log.i("TAG", "onErrorResponse2: "+error.getLocalizedMessage());
                Log.i("TAG", "onErrorResponse3: "+error.getMessage());

                Log.i("TAG", "onErrorResponse4: "+error.getNetworkTimeMs());
                Log.i("TAG", "onErrorRespons5: "+error.getCause());
                Log.i("TAG", "onErrorRespons6: "+error.getStackTrace().toString());
                takenTime = endTime - startTime;
                button.setEnabled(true);
                textView.setText("Error");
                double s = (double) takenTime / 1000;
                double speed = FILE_SIZE / s;
                Log.i("TAG", "onResponse: "+new DecimalFormat("##.##").format(speed) + "kb/second");

            }
        });

        request.setRetryPolicy(new DefaultRetryPolicy(8000,
                2,
                2));

    }

}

错误监听器中的所有日志语句都返回 null。我能够看到 GSM 的 TimeOut toast。是否可以使用 Volley 而不是下载管理器为 GSM 执行此操作？我不能使用 Retrofit，因为客户的要求是 Volley为了在最短时间内使用 GSM 从服务器高效下载文件，我应该做些什么不同

Answer 1

如果你想在应用程序中下载大文件，你可以使用 https://github.com/amitshekhariitbhu/Fast-Android-Networking .

 public void downloadFile(String url) {

        AndroidNetworking.download(url, Utils.getRootDirPath(this), fileName)
                .setPriority(Priority.HIGH)
                .setMaxAgeCacheControl(1000, TimeUnit.DAYS)
                .build()
                .setDownloadProgressListener(new DownloadProgressListener() {
                    @Override
                    public void onProgress(long bytesDownloaded, long totalBytes) {
                        int per = (int) ((bytesDownloaded * 100) / totalBytes);

                    }
                })
                .startDownload(downloadListener);
    }