Step 08 - Progress Bar

    offers us advice on using the progress bar in multi-threaded application. Not quite what we are ready for yet! (but file it away for future reference).

    These two methods are probably what we need:

    First we would need to equip our activity with the ability to remember the donation amounts:

    Lets set max progress bar to 10000 in onCreate:

    Try this now and observe the progres bar.

    This is the complete class:

    1. package com.example.donation;
    3. import android.os.Bundle;
    4. import android.app.Activity;
    5. import android.util.Log;
    6. import android.view.Menu;
    7. import android.view.View;
    8. import android.widget.Button;
    9. import android.widget.RadioGroup;
    10. import android.widget.NumberPicker;
    11. import android.widget.ProgressBar;
    14. public class Donate extends Activity
    15. {
    16.   private int          totalDonated = 0;
    18.   private RadioGroup   paymentMethod;
    19.   private ProgressBar  progressBar;
    22.   @Override
    23.   protected void onCreate(Bundle savedInstanceState)
    24.   {
    25.     super.onCreate(savedInstanceState);
    26.     setContentView(R.layout.activity_donate);
    28.     donateButton  = (Button)       findViewById(R.id.donateButton);
    29.     paymentMethod = (RadioGroup)   findViewById(R.id.paymentMethod);
    30.     progressBar   = (ProgressBar)  findViewById(R.id.progressBar);
    31.     amountPicker  = (NumberPicker) findViewById(R.id.amountPicker);
    33.     amountPicker.setMinValue(0);
    34.     amountPicker.setMaxValue(1000);
    35.     progressBar.setMax(10000);
    36.   }
    38.   @Override
    39.   {
    41.     return true;
    42.   }
    44.   public void donateButtonPressed (View view) 
    45.   {
    46.     int amount = amountPicker.getValue();
    47.     int radioId = paymentMethod.getCheckedRadioButtonId();
    48.     String method = radioId == R.id.PayPal ? "PayPal" : "Direct";
    49.     totalDonated = totalDonated + amount;
    50.     progressBar.setProgress(totalDonated);
    51.     Log.v("Donate", "Donate Pressed! with amount " + amount + ", method: " + method);
    52.     Log.v("Donate", "Current total " + totalDonated);
    53.    }
    54. }

    Here is another version of exactly the same class:

    Examine them carefully. What are the differences? Why make these changes?

    Visible here:

    1.   private int          totalDonated = 0;
    3.   private RadioGroup   paymentMethod;
    4.   private ProgressBar  progressBar;
    5.   private NumberPicker amountPicker;

    and here:

    and here:

    Android code can become very verbose and complex. Carefully formatting is essential if you are not to be overwhelmed.