Question

I have an activity ‘Activity1’ and also another activity named ‘Activity2’. The ‘Activity2’ is loaded upon clicking a button in ‘Activity1’. I wanted to display the progress dialog until the new activity is loaded . Can you please show me the code to do this

Answer 1

There is two ways to

First approach To use Async Task

If you are doing heavy tasks eg loading data from server or parsing xml in that case use AsynTask<>
If you want to call ActivityB from ActivityA then

*step-1*create a AsyncTask class. write all background tasks inside doBackground() method and after completion of task you want to call an activity that code write inside onPostExecute() post execute method

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.view.View;



public class LoadingDataFromServer extends AsyncTask {
    Context currentContext = null;

    boolean isCancelled = false;


    public LoadingDataFromServer(Context context) {
        currentContext = context;

    }

    @Override
    protected void onPreExecute() {
        if (DashboardActivity.progressBarLayout != null) {
            DashboardActivity.progressBarLayout.setVisibility(View.VISIBLE);
            // Log.i(TAG,".....Now make progress bar visible.....");
        }

        super.onPreExecute();
    }

    @Override
    protected Object doInBackground(Object... params) {
        // do background processing

        try {
// do background tasks eg sever communication
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Object result) {
        // TODO Auto-generated method stub
        // progressDialog.dismiss();

        // call second Activity
        Intent i = new Intent(currentContext, com.ActvityB.class);
        super.onPostExecute(result);
    }

    @Override
    protected void onCancelled() {
        // TODO Auto-generated method stub
        isCancelled = true;
        super.onCancelled();
    }

}

step-2 In the activity fro where you want to jump to new activity (eg in ActivityA) call the execute() of AsynTask

new LoadingDataFromServer(context).execute(null);

Second approach

• First show progress dialog.
• create a thread to do all background tasks. when the thread completes
  the task then cancel the progress dialog and call the next activity

or

• when thread complets the task then call next activity pass this
  object (progress dialog) and inside that new activity dismiss this
  dialog.