it-ebooks - Android 101 Labs
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As a final exercise, try and add some event handling to the Report Activity - i.e. when the user selects a row in Report List, display a simple toast detailing which row was selected and the donation data from that row.
Something like this:
You may find the following useful if you need to refactor your Donation model
and
Project Solution (and Starter for the next lab):
Just to get used to adding and editing resources, create a new button for our main layout, and try and 'hook it up' to a new string resource message to display to the user.
Have a look at adding in a new colour resource and changing the default background colour for the layout.
Archive of lab so far:
Consider an alternative to the NumberPicker - specifically one of the "Text Fields" controls:
These are mostly EditView objects:
- http://developer.android.com/reference/android/widget/EditText.html
Redesign the activity to take a value from the picker or directly from a text view and maintain a "Total so Far" Value:
If the number picker is set to zero, then attempt to get a number from the text view.
Here is a hint (a version of donatButonPressed that does what we want):
public void donateButtonPressed (View view) { String method = paymentMethod.getCheckedRadioButtonId() == R.id.PayPal ? "PayPal" : "Direct" ; progressBar.setProgress(totalDonated); int donatedAmount = amountPicker.getValue(); if (donatedAmount == ) { String text = amountText.getText().toString(); if (!text.equals( "" )) donatedAmount = Integer.parseInt(text); } totalDonated = totalDonated + donatedAmount; Log.v( "Donate" , amountPicker.getValue() + " donated by " + method + "\nCurrent total " + totalDonated); }Revise the app such that when the target is achieved (10000) - then no more donations accepted, and the user is made aware of this.
Hint - here is how you can display a simple alert:
Toast toast = Toast.makeText( this , "Target Exceeded!" , Toast.LENGTH_SHORT); toast.show();Modify the colour scheme for our widgets..
You will notice that the Floating Action Button, the Radio Buttons, the Progress Bar etc, are all a kind of pink - not really in line with our current colour scheme.
Hint - have a look at your colors.xml
Archive of lab with the above Exercises:
This is where you can find all the labs for Android 101.
We will be covering and introduction to Android using a simple Case Study called Donation
The labs will begin with a simple Android app and progress on to a fully fledged App with Custom Adapters and built-in persistence.
If you're looking for a bit more than an introduction, you should have a look at my Mobile Application Development Labs.
This lab is really just to get you up to speed with using the Android environment and the basic structure of an Android Application. We'll put our own spin on the classic 'Hello World' application and demonstrate the use of some very basic widgets and event handling.
This is our first look at the Donation case study, and will involve building an initial single screen app, with some common Android widgets on our layout.
Be able to download and install Android Studio, the Android SDK and understand its key features. In particular:
Project View
SDK Manager
AVD Manager
Be able to understand the structure of an Android Studio Project
Have created a simple Android App (HelloWorld), and be able to manage it within the Android Studio environment.
In this Lab, you will be required to build the first version of our Donation Case Study App , called Donation.1.0. We will build on this lab (and the Case Study) over the following weeks and add in some new features and UI Design along the way. In this version we will add in a few UI widgets on a single layout and implement some basic event handling.
On completion of this lab you'll be able to
design an initial layout for the app.
add different widgets (such as a button, text and picker) to a layout.
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