"Lushengduan" 01, build the Android app development environment programming program HelloWorld

First, build the development environment

1. JDK Environment variables

JDK Download

Link: http://pan.baidu.com/s/1gen1o9l Password: 8fko

Open Computer-Properties-Advanced system settings-environment variables, new JAVA_HOME system environment variables

C:\Program Files\java\jdk1. 7. 0_80

New CLASSPATH System environment variable

.; %java_home%lib;%java_home%lib\tools.jar;

Append to System environment variable path

;%java_home%/bin; C:\Program Files\java\jre7\bin

2. Install Android Studio

Link: http://pan.baidu.com/s/1mgrc7wk Password: mqn8

After the installation is complete, open Android Studio, before having the studio configuration of the first choice, this article we choose a second

Next follow the prompts, the process will be networked download/update the SDK, when finished click "Finish", Studio installed successfully

II. Preparation of the procedure HelloWorld

Open Android Studio, we select "Start a new Android studio project"

Change the name of the program to HelloWorld, and the second line remains the default (it's best to customize it so you don't have to repeat it with someone else's package name)

Tick "phone and Tablet", then select the SDK version, here Select "4.0.3", currently equipped with more than 4.0 version of the mobile phone is more than 90%, so it is compatible with most devices

Select "Add No Activity", we intend to write a helloworldactivity, do not use the default activity, click "Finish", this step will be connected to download some of the necessary things, please wait a moment to enter the studio main interface

OK, we can start to write our HelloWorld, to present a mobile phone can see the interface, we must write a class inherit from activity, the name of the class is named Helloworldactivity; in the Java directory, by right-clicking on the contents of the red box, New--java class to create our classes

After clicking "OK", enter the following code in the Helloworldactivity class

 PackageCom.example.lushengduan.helloworld;Importandroid.app.Activity;ImportAndroid.os.Bundle;ImportAndroid.widget.TextView;/*** Created by Lushengduan on 2016/3/4.*/ Public classHelloworldactivityextendsActivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate); TextView TextView=NewTextView ( This); Textview.settext ("Helloworld!");    Setcontentview (TextView); }}

Open Androidmanifest.xml, modify its contents to the following code

<Manifestxmlns:android= "Http://schemas.android.com/apk/res/android" Package= "Com.example.lushengduan.helloworld">    <ApplicationAndroid:allowbackup= "true"Android:icon= "@mipmap/ic_launcher"Android:label= "@string/app_name"Android:supportsrtl= "true"Android:theme= "@style/apptheme">        <ActivityAndroid:name=". Helloworldactivity ">            <Intent-filter>                <ActionAndroid:name= "Android.intent.action.MAIN"/>                <categoryAndroid:name= "Android.intent.category.LAUNCHER"/>            </Intent-filter>        </Activity>    </Application></Manifest>

To create a new Android emulator or plug in your phone, click the run--"Run App" on the menu bar to start running the program with the following results:

At this point, our HelloWorld application is complete!!

"Lushengduan" 01, build the Android app development environment Program HelloWorld