从android中的sql server下载表格行时显示进度条

Posted 2023-05-07

【中文标题】从android中的sql server下载表格行时显示进度条

【英文标题】：show progress-bar while downloading table row from sql server in android

【发布时间】：2017-05-22 00:26:06

【问题描述】：

我正在从 android 中的 sql server 获取表行，我想在进度条中显示，但我遇到了问题。我正在使用 SQL Connection 类，它不允许占用表行的长度。我的连接类。

String ip="192.168.43.85";
String classs="net.sourceforge.jtds.jdbc.Driver";            
String db="mydatabasename";
String uname="myname";                                                 
String pass="pass";

@SuppressLint("New Api")
public Connection CON() throws IOException

    StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    Connection connection=null;
    String ConUrl=null;

    try 

        Class.forName(classs);
        ConUrl="jdbc:jtds:sqlserver://"+ip+";"
                + "databaseName="+db+";user="+uname+";password="
                +pass+";";
        connection= DriverManager.getConnection(ConUrl);


     catch (ClassNotFoundException e) 
        Log.e("ERRO",e.getMessage());

     catch (SQLException e) 
        Log.e("ERROR",e.getMessage());
     catch (Exception e) 
        Log.e("ERROr", e.getMessage());
    

    return connection;

我尝试了一些来自 google 的示例，但所有示例都使用 http 和 url，但我没有 url 来查找长度。

    Connection conn = null;
    try 
        conn = connectionClass.CON();
     catch (IOException e) 
        e.printStackTrace();
    
    if (conn == null) 

        Toast.makeText(getApplicationContext(), "Error in Connection with server.Make sure your internet connection is ON", Toast.LENGTH_SHORT).show();
     else 

        Statement stmt = null;

        try 
            //String Slqquery = "select * from Zmat";
            String Slqquery1 = "select GlobalSummaryReportFlag,StudyID,StoreCode,StudyDesc from GlobalCountSummaryReport where GlobalSummaryReportFlag='1' and StudyId='" + strStudyId1 + "' and StoreCode='" + strStudyCode2 + "' and StudyDesc='" + strStudyDes3 + "'";

            stmt = conn.createStatement();
            ResultSet rs3;
            rs3 = stmt.executeQuery(Slqquery1);
            if (rs3.next()) 

                progress1=new ProgressDialog(MenuActivity.this);
                progress1.setMessage("Downloading GC");
                progress1.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progress1.setIndeterminate(true);
                progress1.setProgress(0);
                progress1.setMax(100);
                progress1.show();
        final int totalProgressTime = 100;
        new Thread(new Runnable() 
            @Override
            public void run() 
                int jumpTime = 0;

                while(jumpTime < totalProgressTime) 
                    try 
                        Data();
                        if (countForHireMapping == 0 || CountForArticle == 0) 
                            Toast.makeText(getApplicationContext(), "Downloaded UnSuccessfully Please Retry", Toast.LENGTH_SHORT).show();
                            delete2();
                            progress1.dismiss();
                         else 

                            sleep(200);
                            jumpTime += 5;
                            progress1.setProgress(jumpTime);
                            progress1.dismiss();
                            Intent intent = new Intent(MenuActivity.this, LocationActivity.class);
                            startActivity(intent);
                            Toast.makeText(getApplicationContext(), "Downloaded Successfully", Toast.LENGTH_SHORT).show();
                        

                     catch (InterruptedException e) 
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    
                
            
        ).start();

             else 
                Toast.makeText(getApplicationContext(), "Gc Not Completed", Toast.LENGTH_SHORT).show();
            
         catch (SQLException e) 
            e.printStackTrace();
        
    `

【参考方案1】：

您应该在 MainActvity 中使用 AsyncTask

它包含3个方法：

onPreExecute()：在这个方法中放置你想要在类执行之前做的任何事情。（在你的例子中是一个 progressBar ）

doInBackground()：在此方法中放置您希望应用在后台执行的任何操作。（例如：从服务器获取数据）

onPostExecute()：在此方法中，在后台进程完成后放置您想要执行的任何操作。 （示例：根据从在线服务器接收到的数据设置视图）

Here is a tutorial 让您快速了解 AsyncTask。

编码愉快。