You can take a look at android basics, and can start android application development.
https://techinsight.dhanashree.com/introduction-to-android-first-step-of-android-development
PREREQUISITE
First of all you must have at least one Android SDK installed in your computer. You can get more idea on setting up the SDK environment, on <br/>http://developer.android.com/sdk/index.html
You also need one of TOOL for android development, I have choose, Eclipse IDE plug-in.
If you need to install Eclipse, you can download it from this location:
http://www.eclipse.org/downloads/
For SDK installation, you can refer:
http://developer.android.com/sdk/installing.html
Or In short: If have not downloaded any SDK version then
You can launch the Android SDK and AVD Manager, From within Eclipse,
Select Window > Android SDK and AVD Manager.
Here, under, Available Packages option, you can select one of Android SDK version, and click “Install Selected” button.
SETTINGS in Eclipse
Following settings you have to make (in Eclipse) before running android application.
In Eclipse IDE, go to
Window- > Android SDK and AVD Manager
And, Under Virtual Devices option, click “New” button and make virtual device that will display and show your application (or widget) inside it.
Second thing is, At least one SDK target set in Eclipse environment.
In Eclipse IDE, go to
Window- > Preference
Under “Android” option, SDK Location setting is there,
Click “Browse” button and select path of android sdk folder. (From where system can find ‘platforms’ folder under which your sdk folder will be there).
For example, I have following folder hierarchy
android-sdk-windows\platforms\android-4
So, I have to specify path up to “android-sdk-windows”.
SAMPLE ANDRIOD APPLICATION
Now you are ready to make new Android Application,
File-> New -> Project
Small window will appear, here select “Android Project” option, and click “Next” button.
Second window will display. Asking you application options:
Project Name: firstapp
Under Build target: one of sdk will be selected.
Package Name: must be specified, we can give, thesmile.android.widget
Now click “Finish” button.
‘Package Explorer’ window inside IDE will show your project (firstapp).
It will contain various folders:
SRC : contains various .java files, inside which you have to write your code.(in this example there will be FirstappActivity.java file)
RES: this resource folder contains folders inside it like ‘layout’, ’values’ , ‘drawable-ldpi’ etc…
drawable-ldpi : folder is for images you wants to use in application
layout : folder contains .xml files, Layouts are same as Forms in window application, it represents screens of your application.
In our example this file will contain 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”
>
<TextView
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”
android:text=“@string/hello”
/>
</LinearLayout>
values : folder will have strings.xml file, which stores application level various strings like application name, and small text.
Most important file in your project is, AndroidManifest.xml , which contains application level behavior settings.
There will be <activity> tag, inside <application>, this tag specifies which layout will be loaded at first when you application is launched.
If you focus on following lines,
<activity android:name=“.FirstappActivity”
android:label=“@string/app_name”>
<intent-filter>
<action android:name=“android.intent.action.MAIN” />
<category android:name=“android.intent.category.LAUNCHER” />
</intent-filter>
</activity>
In Eclipse IDE, go to
Run -> Run
Select, ‘Android Application’ option, and your Virtual device will show home screen in few minutes.
You can go to menu in your ‘virtual device’ and see widget “Firstapp” (for our example), clicking it will show a screen with text, “Hello World, Firstapp activity.”
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