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POUsing AsynTask to show progress bar while attempting to SSH to Server
 

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    <p>First of all, i have to state that i am new to Java in general &amp; Android. I do however have the basics, or at least getting there.</p> <p>The Purpose of my Application: At the company, we have a Remote server that we SSH to, and do some work. At some times, the server is unreachable and therefore disrupts our work.</p> <p>My application is suppose to do the following:</p> <p>1- Using Jsch, i SSH to the server, if there is a response, then, i will attempt again in 15 minutes, if there is no response, i want to notify.</p> <p>i have successfully done the above in non android version of Java, and was able to do it in Android version, however on the main thread, thus i cannot update anything on the UI. In essence the Progress Bar.. In the regular version, the UI freezes, and in the AsyncTask version provided below. i get an exception as soon as i hit the button</p> <p>Below is the code i am using, to be honest, i read all over that the best solution is AsyncTask, but since i am new to that, i am not sure were my wrong is. I honestly assume its may be in the AsyncTask and AsyncTask . </p> <p>I am not sure what to use there... Below is my code, hopefully someone can point out my mistake.</p> <pre><code>package com.example.myapp; import java.io.IOException; import android.app.Activity; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.HandlerThread; import android.os.StrictMode; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.Toast; import android.os.Handler; public class VedasServerMonitorActivity extends Activity { /** Called when the activity is first created. */ Button button; EditText IP; EditText UserName; EditText Password; EditText Port; ProgressBar progressBar1; String UserStr; String PassStr; String IPStr; int PortInt; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button) findViewById(R.id.button1); IP = (EditText) findViewById(R.id.serverIp); UserName = (EditText) findViewById(R.id.userName); Password = (EditText) findViewById(R.id.password); Port = (EditText) findViewById(R.id.port); progressBar1 = (ProgressBar) findViewById(R.id.progressBar1); StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() .permitAll().build(); StrictMode.setThreadPolicy(policy); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { new asyncTaskUpdateProgress().execute(); } }); } public class asyncTaskUpdateProgress extends AsyncTask&lt;Void, Void, Void&gt; { @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub } @Override protected void onPreExecute() { // TODO Auto-generated method stub progressBar1.setVisibility(View.VISIBLE); UserStr = UserName.getText().toString(); PassStr = Password.getText().toString(); IPStr = IP.getText().toString(); PortInt = Integer.parseInt(Port.getText().toString()); button.setClickable(true); progressBar1.setVisibility(View.INVISIBLE); } @Override protected void onProgressUpdate(Void... values) { // TODO Auto-generated method stub progressBar1.setVisibility(View.INVISIBLE); } @Override protected Void doInBackground(Void... arg0) { boolean ok = false; try { SSHTest sshtest = new SSHTest(); ok = sshtest.sshconnect(UserStr, PassStr, IPStr, PortInt); } catch (Exception e) { e.printStackTrace(); Log.i("ERROR HERE", "doInBackground: IOException");} if (ok) { Toast.makeText(getApplicationContext(), "Connection Susccessfull", Toast.LENGTH_LONG) .show(); } else { Toast.makeText(getApplicationContext(), "Unable to connect", Toast.LENGTH_LONG).show(); notify(getApplicationContext(), true); } return null; } protected void notify(Context context, Boolean on) { NotificationManager nm = (NotificationManager) context .getSystemService(Context.NOTIFICATION_SERVICE); ComponentName comp = new ComponentName(context.getPackageName(), getClass().getName()); Intent intent = new Intent().setComponent(comp); PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK); Notification n = new Notification(R.drawable.warning, "Message", System.currentTimeMillis()); n.setLatestEventInfo(context, "Vedas Server Monitor", "Port Un-rechable", pendingIntent); nm.notify(22, n); } } } </code></pre> <p>android× 194760</p>
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