如何在android中使用volley下载视频文件？

我想使用 volley 库下载视频。我正在使用 volley 库来处理应用程序中的所有网络调用。

首先，我们需要创建一个扩展 Volley Request 类的自定义类。要下载文件数据，我们可以创建自定义字节数组请求。该字节数组可以转换为输入流，将数据写入 SDCard。以下 InputStreamVolleyRequest.java 文件显示了如何创建自定义字节数组请求并访问稍后将用于创建文件名的响应标头。

InputStreamVolleyRequest.java

import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.HttpHeaderParser;
import java.util.HashMap;
import java.util.Map;

public class InputStreamVolleyRequest extends Request<byte[]> {
private final Response.Listener<byte[]> mListener;
private Map<String, String> mParams;
//create a static map for directly accessing headers
public Map<String, String> responseHeaders ;

public InputStreamVolleyRequest(int post, String mUrl,Response.Listener<byte[]> listener,
                                Response.ErrorListener errorListener, HashMap<String, String> params) {
    // TODO Auto-generated constructor stub

     super(post, mUrl, errorListener);
     // this request would never use cache.
     setShouldCache(false);
     mListener = listener;
     mParams=params;
}

@Override
protected Map<String, String> getParams()
        throws com.android.volley.AuthFailureError {
    return mParams;
};


@Override
protected void deliverResponse(byte[] response) {
    mListener.onResponse(response);
}

@Override
protected Response<byte[]> parseNetworkResponse(NetworkResponse response) {

    //Initialise local responseHeaders map with response headers received
    responseHeaders = response.headers;

    //Pass the response data here
    return Response.success(response.data, HttpHeaderParser.parseCacheHeaders(response));
}

}

您的活动课......

import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.HurlStack;
import com.android.volley.toolbox.Volley;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;


public class FileDownloadActivity extends ActionBarActivity implements Response.Listener<byte[]>, ErrorListener{
Button btn_download;
InputStreamVolleyRequest request;
int count;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_file_download);
    btn_download =(Button)findViewById(R.id.button);
    btn_download.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            //Change your url below
            String mUrl="http://yoururl.com";
            request = new InputStreamVolleyRequest(Request.Method.GET, mUrl, FileDownloadActivity.this, FileDownloadActivity.this, null);
            RequestQueue mRequestQueue = Volley.newRequestQueue(getApplicationContext(),
                    new HurlStack());
            mRequestQueue.add(request);
        }
    });
}

@Override
public void onResponse(byte[] response) {
    HashMap<String, Object> map = new HashMap<String, Object>();
    try {
        if (response!=null) {

            //Read file name from headers
            String content =request.responseHeaders.get("Content-Disposition")
                    .toString();
            StringTokenizer st = new StringTokenizer(content, "=");
            String[] arrTag = st.toArray();

            String filename = arrTag[1];
            filename = filename.replace(":", ".");
            Log.d("DEBUG::RESUME FILE NAME", filename);

            try{
                long lenghtOfFile = response.length;

                //covert reponse to input stream
                InputStream input = new ByteArrayInputStream(response);
                File path = Environment.getExternalStorageDirectory();
                File file = new File(path, filename);
                map.put("resume_path", file.toString());
                BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(file));
                byte data[] = new byte[1024];

                long total = 0;

                while ((count = input.read(data)) != -1) {
                    total += count;
                    output.write(data, 0, count);
                }

                output.flush();

                output.close();
                input.close();
            }catch(IOException e){
                e.printStackTrace();

            }
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        Log.d("KEY_ERROR", "UNABLE TO DOWNLOAD FILE");
        e.printStackTrace();
    }
}

@Override
public void onErrorResponse(VolleyError error) {
    Log.d("KEY_ERROR", "UNABLE TO DOWNLOAD FILE. ERROR:: "+error.getMessage());
}
}

还有这个 StringTokenizer 类......StringTokenizer.java https://github.com/beyondroid/VolleyInputStreamFileDownloader/blob/master/app/src/main/java/example/inputstream/ht2/inputstreamdownloader/StringTokenizer.java