Question

我正在努力制作一个简单的应用程序来下载互联网的文件继承人我的代码我已经编辑了一些来自另一个问题，但我仍然没有响应错误，每当我运行我的应用程序可以任何人向我显示更正甚至另一种方式？

    package com.example.downloading;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;

import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.ResultReceiver;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.app.DownloadManager;
import android.app.IntentService;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;

public class MainActivity extends Activity {

    Button startBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        startBtn = (Button)findViewById(R.id.download_button);
        startBtn.setOnClickListener(new OnClickListener(){
            public void onClick(View v) {

                String url = "my stuff";
                DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
                request.setDescription("descrition");
                request.setTitle("title");

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                    request.allowScanningByMediaScanner();
                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                }
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "etc.mp3");


                DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
                manager.enqueue(request);

            }
        });
    }
}

Answer 1

public void DownLoadTheMusic(){
        try {
            URL url = new URL("http://www.tagsinfosoft.com/android/shelf/Shelf_Cam.mp3");
            HttpURLConnection c = (HttpURLConnection) url.openConnection();
            c.setRequestMethod("GET");
            c.setDoOutput(true);
            c.connect();

            String PATH = Environment.getExternalStorageDirectory() + "/download/";
            File file = new File(PATH);
            file.mkdirs();
            File outputFile = new File(file, "Shelf_Cam.mp3");
            FileOutputStream fos = new FileOutputStream(outputFile);

            InputStream is = c.getInputStream();

            byte[] buffer = new byte[1024];
            int len1 = 0;
            while ((len1 = is.read(buffer)) != -1) {
                fos.write(buffer, 0, len1);
            }
            fos.close();
            is.close();


        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "Update error!", Toast.LENGTH_LONG).show();
        }
    }  


call this in a Asynctask




    public class downloadMusic extends AsyncTask<Integer, Integer, Integer>
        {


            @Override
            protected Integer doInBackground(Integer... params) {
                // TODO Auto-generated method stub

                try {

                    DownLoadTheMusic();

                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                return null;

            }

            @Override
            protected void onPostExecute(Integer result) {
                // TODO Auto-generated method stub
                super.onPostExecute(result);
                Context context=shelf.this;
                pd.dismiss();
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "Shelf_Cam.mp3")), "application/vnd.android.package-archive");
                startActivity(intent);  

            }

            @Override
            protected void onPreExecute() {
                // TODO Auto-generated method stub
                super.onPreExecute();
                pd=ProgressDialog.show(shelf.this,"Updating","Please wait....." );
            }

        }

按钮点击执行此任务如果您从互联网上下载小音乐文件，请使用此项。

努力使用Android Eclipse下载文件？

1 个答案: