Display a indeterminate progress bar on title bar

To display a indeterminate progress bar on title bar, we have to request Window Feature of Window.FEATURE_INDETERMINATE_PROGRESS.

Place the code; before setContentView(R.layout.main):
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

then call setProgressBarIndeterminateVisibility(true/false) to turn it on/off.



Modify from the exercise "ProgressDialog + Thread"

package com.exercise.AndroidProgressDialog;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
import android.widget.Toast;

public class AndroidProgressDialogActivity extends Activity {

ProgressDialog progressDialog;
BackgroundThread backgroundThread;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
    
      requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
      setContentView(R.layout.main);

      setProgressBarIndeterminateVisibility(true);
      progressDialog = ProgressDialog.show(AndroidProgressDialogActivity.this,
              "ProgressDialog", "Wait!");
    
      backgroundThread = new BackgroundThread();
      backgroundThread.setRunning(true);
      backgroundThread.start();
  }



  public class BackgroundThread extends Thread{
   volatile boolean running = false;
   int cnt;
 
   void setRunning(boolean b){
    running = b;
    cnt = 10;
   }

@Override
public void run() {
 // TODO Auto-generated method stub
 while(running){
  try {
   sleep(1000);
   if(cnt-- == 0){
    running = false;
   }
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 handler.sendMessage(handler.obtainMessage());
}
  }

  Handler handler = new Handler(){

@Override
public void handleMessage(Message msg) {
 // TODO Auto-generated method stub

 setProgressBarIndeterminateVisibility(false);
 progressDialog.dismiss();

 boolean retry = true;
 while(retry){
  try {
   backgroundThread.join();
   retry = false;
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

 Toast.makeText(AndroidProgressDialogActivity.this,
   "dismissed", Toast.LENGTH_LONG).show();
}
 
  };
}

next:
- Cancel ProgressDialog