Android应用程序更新并下载

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();
     }
 }

UpdateManager

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

判断移动端是否有网络

isOpenNetwork

 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;
     }