Android应用程序更新并下载实例

整理文档，搜刮出一个android应用程序更新并下载实例的代码，稍微整理精简一下做下分享。

创建一个新类，名为updatemanager，代码如下：

import java.io.bufferedreader;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.inputstreamreader;
import java.net.httpurlconnection;
import java.net.malformedurlexception;
import java.net.url;
import com.af.mobile.r;
import android.app.alertdialog;
import android.app.dialog;
import android.app.alertdialog.builder;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.content.dialoginterface.onclicklistener;
import android.content.pm.packagemanager.namenotfoundexception;
import android.net.uri;
import android.os.environment;
import android.os.handler;
import android.os.message;
import android.view.layoutinflater;
import android.view.view;
import android.widget.progressbar;
import android.widget.toast;


public class updatemanager
{private url url=null;
  /* 下载中 */
  private static final int download = 1;
  /* 下载结束 */
  private static final int download_finish = 2;
  /* 保存解析的xml信息 */
  //hashmap<string, string> mhashmap;
  /* 下载保存路径 */
  private string msavepath;
  /* 记录进度条数量 */
  private int progress;
  /* 是否取消更新 */
  private boolean cancelupdate = false;

  private context mcontext;
  /* 更新进度条 */
  private progressbar mprogress;
  private dialog mdownloaddialog;

  private handler mhandler = new handler()
  {
    public void handlemessage(message msg)
    {
      switch (msg.what)
      {
      // 正在下载
      case download:
        // 设置进度条位置
        mprogress.setprogress(progress);
        break;
      case download_finish:
        // 安装文件
        installapk();
        break;
      default:
        break;
      }
    };
  };

  public updatemanager(context context)
  {
    this.mcontext = context;
  }

  public void checkupdate()
  {
    if (isupdate())
    {
      shownoticedialog();
    } else
    {
      
    }
  }

  /**
   * 检查软件是否有更新版本
   * 
   * @return
   */
  private boolean isupdate()
  {
    // 获取当前软件版本
    double versioncode = getversioncode(mcontext);
  
      double servicecode = 1.2;
      // 版本判断
      if (servicecode > versioncode)
      {
        return true;
      }
    
    return false;
  }

  // 获取软件版本号
  
  private double getversioncode(context context)
  {
    double versioncode = 0.0;
    try
    {
      // 获取软件版本号，对应androidmanifest.xml下android:versioncode
      versioncode = (double) context.getpackagemanager().getpackageinfo("com.af.mobile", 0).versioncode;
    } catch (namenotfoundexception e)
    {
      e.printstacktrace();
    }
    return versioncode;
  }

  
   //显示软件更新对话框
  
  private void shownoticedialog()
  {
    alertdialog.builder builder = new builder(mcontext);
    builder.settitle("软件更新");
    string string=download("http://192.168.0.102:9313/daojuserver/uploads/version.xml");//xml的下载地址
    builder.setmessage(string);

    builder.setpositivebutton("更新", new onclicklistener()
    {
      @override
      public void onclick(dialoginterface dialog, int which)
      {
        dialog.dismiss();
        // 显示下载对话框
        showdownloaddialog();
      }
    });
    // 稍后更新
    builder.setnegativebutton("稍后更新", new onclicklistener()
    {
      @override
      public void onclick(dialoginterface dialog, int which)
      {
        dialog.dismiss();
      }
    });
    dialog noticedialog = builder.create();
    noticedialog.show();
  }

  // 显示软件下载对话框
   
  private void showdownloaddialog()
  {
    // 构造软件下载对话框
    alertdialog.builder builder = new builder(mcontext);
    builder.settitle("djfkjd");//提示信息内容
    // 给下载对话框增加进度条
    final layoutinflater inflater = layoutinflater.from(mcontext);
    view v = inflater.inflate(r.layout.softupdate_progress, null);
    mprogress = (progressbar) v.findviewbyid(r.id.update_progress);
    builder.setview(v);
    // 取消更新
    builder.setnegativebutton("取消更新", new onclicklistener()
    {
      @override
      public void onclick(dialoginterface dialog, int which)
      {
        dialog.dismiss();
        // 设置取消状态
        cancelupdate = true;
      }
    });
    mdownloaddialog = builder.create();
    mdownloaddialog.show();
    // 现在文件
    downloadapk();
  }


  private void downloadapk()
  {
    // 启动新线程下载软件
    new downloadapkthread().start();
  }

  private class downloadapkthread extends thread
  {
    @override
    public void run()
    {
      try
      {
        // 判断sd卡是否存在，并且是否具有读写权限
        if (environment.getexternalstoragestate().equals(environment.media_mounted))
        {
          // 获得存储卡的路径
          string sdpath = environment.getexternalstoragedirectory() + "/";
          msavepath = sdpath + "download";
          url url = new url("http://192.168.0.102:9313/daojuserver/uploads/spmobile.apk");//apk下载地址地址
          // 创建连接
          httpurlconnection conn = (httpurlconnection) url.openconnection();
          conn.connect();
          // 获取文件大小
          int length = conn.getcontentlength();
          // 创建输入流
          inputstream is = conn.getinputstream();

          file file = new file(msavepath);
          if (!file.exists())
          {
            file.mkdir();
          }
          file apkfile = new file(msavepath, "dhfudh");
          fileoutputstream fos = new fileoutputstream(apkfile);
          int count = 0;
          // 缓存
          byte buf[] = new byte[1024];
          // 写入到文件中
          do
          {
            int numread = is.read(buf);
            count += numread;
            // 计算进度条位置
            progress = (int) (((float) count / length) * 100);
            // 更新进度
            mhandler.sendemptymessage(download);
            if (numread <= 0)
            {
              mhandler.sendemptymessage(download_finish);
              break;
            }
            fos.write(buf, 0, numread);
          } while (!cancelupdate);
          fos.close();
          is.close();
        }
      } catch (malformedurlexception e)
      {
        e.printstacktrace();
      } catch (ioexception e)
      {
        e.printstacktrace();
      }
      // 取消下载对话框显示
      mdownloaddialog.dismiss();
    }
  };
  
  private void installapk()
  {
    file apkfile = new file(msavepath, "dhfudh");
    if (!apkfile.exists())
    {
      return;
    }
    // 通过intent安装apk文件
    intent i = new intent(intent.action_view);
    i.setdataandtype(uri.parse("file://" + apkfile.tostring()), "application/vnd.android.package-archive");
    mcontext.startactivity(i);
  }
  public string download(string urlstring)
  {
    stringbuffer sbbuffer=new stringbuffer();
    string line=null;
    bufferedreader buffer=null;
  try {
    url=new url(urlstring);
    httpurlconnection urlconn=(httpurlconnection) url.openconnection();
    buffer=new bufferedreader(new inputstreamreader(urlconn.getinputstream()));
    while((line=buffer.readline())!=null)
    {
      sbbuffer.append(line);
    }
  } catch (exception e) {
    // todo: handle exception
    e.printstacktrace();
  }
  finally
  {
    try {
      buffer.close();
    } catch (exception e2) {
      // todo: handle exception
      e2.printstacktrace();
    }
  }
  return sbbuffer.tostring();
  }
}

在android应用程序main界面

if(isopennetwork())//判断是否有网络
    {
      updatemanager manager = new  updatemanager(main.this);
    // 检查软件更新
    manager.checkupdate();
      
    }

判断移动端是否有网络

private boolean isopennetwork() {
    connectivitymanager connmanager = (connectivitymanager) getsystemservice(context.connectivity_service);
    networkinfo networkinfo = connmanager.getactivenetworkinfo();

    if (networkinfo != null) {
      // 2.获取当前网络连接的类型信息
      int networktype = networkinfo.gettype();
      if (connectivitymanager.type_wifi == networktype) {
        // 当前为wifi网络
      } else if (connectivitymanager.type_mobile == networktype) {
        // 当前为mobile网络
      }
      return connmanager.getactivenetworkinfo().isavailable();
    }

    return false;
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。