Question

假设我有Android应用程序，并且在Android应用程序中也有一个功能下载按钮。点击下载按钮，然后下载当前的APK文件。可能吗。如果是，那么请以编程方式帮助我如何做到这一点。

Answer 1

如果您想在手机中预装apk或安装在手机中

请先尝试查看此内容，但需要root电话才能从system / app /

获取文件

Does Android keep the .apk files? if so where?

我认为你可以使用那里的代码将apk复制到你的SD卡

Answer 2

将apk文件放入特定网址。通过使用文件流，您可以下载.apk文件。可以使用基本下载代码进行下载。

检查以下代码：

package com.helloandroid.imagedownloader;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.util.Log;

   public class ImageManager {
   private final String PATH = "/data/data/com.helloandroid.imagedownloader/";  //put the downloaded file here
   public void DownloadFromUrl(String imageURL, String fileName) {  //this is the downloader method

   try {

         URL url = new URL("http://yoursite.com/&quot; + imageURL); //you can write here any link

            File file = new File(fileName);



             long startTime = System.currentTimeMillis();

             Log.d("ImageManager", "download begining");

             Log.d("ImageManager", "download url:" + url);

            Log.d("ImageManager", "downloaded file name:" + fileName);

            /* Open a connection to that URL. */

             URLConnection ucon = url.openConnection();



             /*

              * Define InputStreams to read from the URLConnection.

             */

            InputStream is = ucon.getInputStream();

             BufferedInputStream bis = new BufferedInputStream(is);



             /*

              * Read bytes to the Buffer until there is nothing more to read(-1).

              */

             ByteArrayBuffer baf = new ByteArrayBuffer(50);

             int current = 0;

             while ((current = bis.read()) != -1) {

                     baf.append((byte) current);

             }



             /* Convert the Bytes read to a String. */

            FileOutputStream fos = new FileOutputStream(file);

            fos.write(baf.toByteArray());

             fos.close();

            Log.d("ImageManager", "download ready in"

                             + ((System.currentTimeMillis() - startTime) / 1000)

                             + " sec");



    } catch (IOException e) {

            Log.d("ImageManager", "Error: " + e);

     }



    }

 }

如何从当前的Android应用程序动态下载现有的apk文件？

2 个答案: