Tutorials

Android LayoutInflater Turorial

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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 […]

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Tutorials

Android simple splash screen

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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

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Tutorials

Android Persist Data Using Shared Preferences

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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:

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Snippets, Tutorials

Android: Open the Calculator from Android using Intent

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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

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Snippets, Tutorials

Android Vibrate on Click

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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

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Snippets, Tutorials

Android EditText text changes Listener

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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

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Tutorials

Detect when Done key is pressed

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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

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Solutions, Tutorials

Android SSL self signed certificate pass by

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This is not my work, I have just found the solution some time ago on the internetUsing the class below you can pass by the ssl certificate error that Android may throw when you are trying to connect to a self signed certified server:First the EasySSLSocketFactory class : import java.io.IOException; import java.net.Socket; import java.net.UnknownHostException; import java.security.KeyManagementException; import

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Solutions, Tutorials

Android SQLite Ignore Case from Database

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If you want to select data from Database and you want to ignore the case of letters you should use COLLATE NOCASE in your query: “SELECT * FROM  myDataBaseName WHERE some_column= some_value COLLATE NOCASE” It’s not exactly an android issue but you might need some day in your android projects, so I hope it helps

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Tutorials

Android Gallery with Dots On Scroll

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In this tutorial I will show you how to create an Android Gallery and how to create dots or little circles when you scroll the images. So let’s start: 1. First you have to create a new project. 2. After the project is created go to res -> drawable and put your images in the

Solutions, Tutorials

Run Android Lint from command line

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Not many of us use android Lint tool to scan the projects for possible performance or best practices tips. Eclipse has the Lint tool included into adt plugin so Eclipse users can take advantages of this. Ok but what about developers that use intellij IDEA or other IDE for android projects? The answer is simple,

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Solutions, Tutorials

Android How to put markers/pins on the map

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We’ve already explained how to make an application with a map here. So, now we will try to put markers or pins (or however are they called) on the map, by knowing the Latitude and Longitude, in case you will ever need it and someday you will :) . So lets start: 1. After you

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Tutorials

Android PreferenceActivity & SharedPreferences tutorial

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I will start with an example. Let’s assume that we want the user to change the date format of your application. For this you must have a class that extends PreferenceActivity, but first you have to create an XML file like this: 1. Make a directory in res called “xml” 2. In the xml directory

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Snippets, Solutions

Android: PreferenceActivity Custom Title

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If you want to make a custom title in a class that extends PreferenceActivity you must put requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); BEFORE super.onCreate(savedInstanceState); Otherwise you will get a Force Close

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