Android development tutorials. Bigger content articles that aim to help one achieve or learn something in a guided/step by step pace.
In this tutorial I will show you how to use Broadcast Receiver and how to use Parcelable too. To do this, we will create an ExpandableList which will have parents and children(they will contain only their names). The children will be an arrayList of strings and because we want to pass this array with an […]
In this tutorial I will show you how to make a simple Expandable List. 1. Create a new project and call your java class(the one that is generated by Eclipse or other IDE) “MyActivity”. 2. Go to res – layout -main.xml and put the following code: <?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:orientation=”vertical” android:layout_width=”fill_parent” android:layout_height=”fill_parent” >
In this tutorial I will show how to use a database in Android by creating the tables and columns using the SQLite Database Browser.1. So the first step is to download the SQLite Database Browser2. Make a new project and name the main java class that generates with the project “MyActivity”. 3. Now you have to go
In this tutorial we will make a TCP Connection. The server will be written in Java and the client will be written in Android. Actually it will be a very simple messenger client. Note: Now we have an enhanced version of TCP Connection here, but it’s just the code. For more details and explanations you still
In this tutorial I will show you how to create a simple ListView with a custom ListAdapter. But first, let’s see why to use ListView. Why shouldn’t we use ScrollView instead, regarding that it’s easier to create? Well your questions are good ones :) . The advantage of the ListView is that it uses an
In the preview tutorial I explained how to add AdMob to your project, but we created the AdView in Java. So in this tutorial I will show you how to set it up in XML. Actually it’s more simple this way, at least in my opinion :) 1. Create a new project (or use an
NOTE 1: This tutorial is now deprecated. See this one instead! NOTE 2: This project is made in Intellij. For those who use Eclipse or other IDE the integration of AdMob library will differ. You can use AdMob lib only on at least Android v3.2 (Api Level 13), so you must compile your project on
In this tutorial I will show you how to use the LayoutInflater in Android.1. Make a new project (I called my project InflaterExample and my main Activity it’s called “MyActivity”) 2. Go to res – layout – main.xml and put an id called “main_layout_id” <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:orientation=”vertical” android:layout_width=”fill_parent” android:layout_height=”fill_parent” android:id=”@+id/main_layout_id”> </LinearLayout> 3. Go to res
Hi, I have seen that many android starters have problems in implementing their own splash screen in Android (as I had once).UPDATE: As Rafael noticed me, there is also an improvement to be made on the splash screen and this is when the user presses the back button on the splash screen, we should avoid
Most of the projects need to persist different data in order to use it in a way or another. So in this tutorial I will show you how to persist your data using Shared Preferences in Android. First you have to know that in Android, if you need to store data you have 4 options to achieve this:
If you make an application and you need to open the calculator that comes with Android you can use the code bellow, but be careful because some Android phones might not have the Calculator installed or the name of the package and class might differ. 1. When you make the new project call your main
If you want to make the phone to vibrate when you click on a button from your application: 1. You have to declare in your AndroidManifest.xml the permission: <uses-permission android:name=”android.permission.VIBRATE”/> 2. Now go to the class you want to put the vibration and in onCreate put this code: final Vibrator vibe = (Vibrator) yourActivity.this.getSystemService(Context.VIBRATOR_SERVICE); //replace
If you want “listen” to the text changes from an EditText you have to use the TextWatcher. Bellow I will show you an example of TextWatcher: //first, we create an EditText EditText answer = new EditText(this); //second, we create the TextWatcher TextWatcher textWatcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int
If you want to detect when a key from soft keyboard is pressed, like Done key, you can use the following code: mEditText = (EditText)findViewById(R.id.edit); mEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { //verifies what key is pressed, in our case verifies if the DONE key is pressed if (actionId
