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Android Studio Canary

In case you feel adventurous you can try hottest builds from Canary releases:

http://tools.android.com/download/studio/canary

Why would you wan to do that?
For example Android Studio 1.3 (2 days old) has support for NDK.

Android Studio Canary

In case you feel adventurous you can try hottest builds from Canary releases:

http://tools.android.com/download/studio/canary

Why would you wan to do that?
For example Android Studio 1.3 (2 days old) has support for NDK.

AndroidStudio: install *.md plugin

It is a common practice to provide a README text file in the root of the project.
The file usually specify:
- project overview
- project dependencies
- how to build the project
- copyrights

It is became the standard to write this file in a MarkDown format README.md

Once you create a new *.md text file the AndroidStudio tells you that it does not recognize the format and to download the plugin.

AndroidStudio: install *.md plugin

It is a common practice to provide a README text file in the root of the project.
The file usually specify:
- project overview
- project dependencies
- how to build the project
- copyrights

It is became the standard to write this file in a MarkDown format README.md

Once you create a new *.md text file the AndroidStudio tells you that it does not recognize the format and to download the plugin.

Android Studio: GIT: .gitignore

Managing which files should be ignored by GIT (code repository) it an important skill. It is done by .gitignore file in which each line represents a directory, a pattern, or a file to be ignored.

Android Studio: GIT: .gitignore

Managing which files should be ignored by GIT (code repository) it an important skill. It is done by .gitignore file in which each line represents a directory, a pattern, or a file to be ignored.

Step: Stay organized

Keep your GIT ignore file organized, I keep it ordered alphabetically using a script in TextWrangler editor.

Step: Find Plugin

Always investigate plugins available to support your code.

Gradle: Working with multi app projects in Android Studio

In this tutorial I wanted to share how is my project organized to work with multiple apps and libraries.




I have the following settings.gradle in the root of my Project:

include ':app'
include ':appBookShelf'
include ':appNFC'
include ':appUnitConverter'
include ':appUserPreferences'
include ':libraries:ListViewSwipeActivity'

Please note that I perpend my app names with "app.." to keep them organized, I also have a folder "libraries" where I keep the code of my submodules.

Here is my folder structure:

CIT299 $ t
.
├── CIT299.iml
├── app
│   ├── app.iml
│   ├── build
│   ├── build.gradle
│   ├── proguard-rules.pro
│   └── src
├── appBookShelf
│   ├── build
│   ├── build.gradle
│   └── src
├── appNFC
│   ├── build
│   ├── build.gradle
│   └── src
├── appUnitConverter
│   ├── appUnitConverter.iml
│   ├── build
│   ├── build.gradle
│   ├── proguard-rules.pro
│   └── src
├── appUserPreferences
│   ├── build.gradle
│   └── src
├── build.gradle
├── gradle
│   └── wrapper
├── gradle.properties
├── gradlew
├── gradlew.bat
├── libraries
│   └── ListViewSwipeActivity
├── local.properties
└── settings.gradle

Gradle: Working with multi app projects in Android Studio

In this tutorial I wanted to share how is my project organized to work with multiple apps and libraries.

9b. Gradle: AndroidStudio with submodules (library projects)

In this tutorial we will overview integration basics of Android Studio and Gradle build tools.

9b. Gradle: AndroidStudio with submodules (library projects)

In this tutorial we will overview integration basics of Android Studio and Gradle build tools.

Step 1: Verify local.properties file

## This file is automatically generated by Android Studio.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file should *NOT* be checked into Version Control Systems,
# as it contains information specific to your local configuration.
#
# Location of the SDK. This is only used by Gradle.
# For customization when using a Version Control System, please read the
# header note.
sdk.dir=/Users/uki/Documents/Dropbox/Android/android-sdk-macosx

As noted, this is for us to only verify that we have the right Android tools directory specified.

I also have $ANDROID_HOME  in my ~/.profile which serves the same purpose

# ANDROID - updated: Oct 17, 2014
export ANDROID_HOME=~/Documents/Dropbox/Android/android-sdk-macosx
export PATH=${PATH}:${ANDROID_HOME}/build-tools/21.0.0
export PATH=${PATH}:${ANDROID_HOME}/platform-tools
export PATH=${PATH}:${ANDROID_HOME}/tools

Remember to update build-tools to latest stable version, in my case Android Lollipop 5.0. API 21

If you are developing code with multiple people, verify that .gitignore file contains files that are specific only to you.

local.properties

Step 2: Gradle Project structure with library projects

Step 3: Gradle Wrapper "gradlew" permission to execute

I had to add execute (+x) permissions to my gradlew script

$ ./gradlew
-bash: ./gradlew: Permission denied
$ chmod +x gradlew

Run ./gradlew (.bat)

$ ./gradlew
Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0
:help
Welcome to Gradle 1.10.
To run a build, run gradlew <task> ...
To see a list of available tasks, run gradlew tasks
To see a list of command-line options, run gradlew --help

If you inspect gradle/wrapper/gradle-wrapper.properties you will notice it uses older Gradle jar:

$ more gradle/wrapper/gradle-wrapper.properties#Fri Oct 17 10:58:51 CDT 2014
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-all.zip

However updating it to a newer one did not produce correct results, so I left it at original 1.10.

Step: Preventing duplicate dependencies

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.DexException: Multiple dex files define Landroid/support/v7/appcompat/R$anim;

Make sure that if your Library project has:

dependencies {
    compile 'com.android.support:appcompat-v7:19.+'
...

then you main App should not have the different version of the same jar.

Also do:

Build > Clean Project

Step: before writing of  a new build script always update Android SDK

Step: Writing example app build.gradle

While writing Gradle script use Android Studio tips:

The sections listed below are in the same order as in my project/app/build.grade file:

Step: plugin Android or Java?

apply plugin: 'com.android.application'

Step: buildscript{}

// build script is not necessary unless you want to provide non-standard configuration
buildscript {
repositories {
//mavenCentral()
// even if not necessary, I am giving example of other repo in case failure of mavenCentral
//jcenter()
}
dependencies {
// This is Android plugin for Gradle, not actual Gradle 2.1
// classpath 'com.android.tools.build:gradle:0.12.+'
}
}

Step: dependencies{}

dependencies {
    /**
     *  Include all jars from the lib directory.
     */
    compile fileTree(dir: 'libs', include: ['*.jar'])
    /**
     * You must install or update the Support Repository through the SDK Manager to use this dependency.
     * v4 is needed for Theme.AppCompat.Light.DarkActionBar
     **/
    compile 'com.android.support:support-v4:21.0.0'
    /**
     * Even if NOT recommended I use 19.+ notation, also I am not using 21.+ because of errors:
     * No resource found that matches the given name 'android:TextAppearance.Material'.
     * even if my SDK Manager is up to date with API 21.
     * since support-v7 is included in the libraries project it is not needed here.
     */
    // compile 'com.android.support:appcompat-v7:21.0.0'
    compile 'com.android.support:appcompat-v7:19.+'
    /**
     * The main app depends on LIBRARY ListViewSwipeActivity
     */
    compile project(':libraries:ListViewSwipeActivity')
}

Step: repositories{}

/**
 * needed only if you have to specify non-standard configuration
 **/
repositories {
    mavenCentral()
    /**
     * even if not necessary, I am giving example of other repo in case failure of mavenCentral
     */
    //jcenter()
}

android{}

android {
    /**
     * compileSdkVersion is the same as the target property in the project.properties
     */
    compileSdkVersion 21 // Lollipop 5.0
    /**
     * Check Android SDK Manager for the NEWEST tools version:
     */
    buildToolsVersion '21.0.2' // Lollipop 5.0
    defaultConfig {
        versionCode 1
        versionName "1.0"
        /**
         * minSdkVersion should be set to 7 if you depend on support-v7.
         */
        minSdkVersion 7
        targetSdkVersion 21  // Lollipop 5.0
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
    /**
     * I am using default Gradle locations,
     * but if you use Ant based projects you may have to adjust
     */
    sourceSets {
        main {
            manifest.srcFile 'src/main/AndroidManifest.xml'
            java.srcDirs = ['src/main/java']
            aidl.srcDirs = ['src/main/aidl']
            res.srcDirs = ['src/main/res']
            assets.srcDirs = ['src/main/assets']
            //renderscript.srcDirs = ['src']
            //resources.srcDirs = ['src']
        }
        /**
         * androidTest.setRoot moves the whole sourceSet (and its sub folders) to a new folder.
         * This moves src/androidTest
         */
        androidTest.setRoot('tests')
    }
}

Additional reading:


http://tools.android.com/tech-docs/new-build-system/user-guide#TOC-Library-projects

http://www.gradle.org/docs/current/userguide/gradle_wrapper.html

5d. AndroidStudio: convert to lower/upper case

This tutorial shows you how to change the code lower/upper case of code in Android Studio.

5d. AndroidStudio: convert to lower/upper case

This tutorial shows you how to change the code lower/upper case of code in Android Studio.




FROM:

  <string-array name="CONVERSION_TYPES">

TO:

<string-array name="conversion_types">

Highlight the text and use "shift command y"

to go to UPPER case "shift command u"

5a. Android Studio: create new Java CONSTANTS class

Sometimes is worth to extract a bunch of code to a separate class to keep the original short and sweet (readable and maintainable).

5a. Android Studio: create new Java CONSTANTS class

Sometimes is worth to extract a bunch of code to a separate class to keep the original short and sweet (readable and maintainable).




In our Activity class I had a lot of constants:

   private final static double CONVERSION_METERS_TO_YARDS = 1.093613298;
   private final static double CONVERSION_KILOMETERS_TO_MILES = 0.621371192;

One way to maintain them was to move them to a new Java class ConversionConstants

• Make sure you write the JavaDoc /** my description */ for each class you create
• constants are public - available form any other class
• constants are final - the value cannot be changed by the code
• constants are static - indicate that the constant will belong to class and not the instance, you don't have to have an instance to get it e.g. ConversionConstants.METERS_TO_YARDS

package com.chicagoandroid.cit299.calc;
/**
* This class will contain hundreds of possible conversion constants.
*/
public class ConversionConstants {
    public final static double METERS_TO_YARDS = 1.093613298;
    public final static double KILOMETERS_TO_MILES = 0.621371192;
}

Now I can access these constants from any other class and use them in my calculations:

Note: I am not providing the source code on purpose because copy-and-paste is not a good learning experience.