Develop Reference

I can't run react-native-webrtc-demo on my android emulator in mac os

I am going to show IP camera real-time on the mobile app.
So I downloaded Oney's RCTWebRTCDemo from GitHub to run it.
I did the following works.
Bians-iMac:MyHome byz$ git clone https://github.com/oney/RCTWebRTCDemo.git
Cloning into 'RCTWebRTCDemo'...
remote: Counting objects: 359, done.
remote: Total 359 (delta 0), reused 0 (delta 0), pack-reused 359
Receiving objects: 100% (359/359), 456.78 KiB | 303.00 KiB/s, done.
Resolving deltas: 100% (155/155), done.
Bians-iMac:MyHome byz$ cd RCTWebRTCDemo
Bians-iMac:RCTWebRTCDemo byz$ npm install
npm WARN deprecated connect#2.30.2: connect 2.x series is deprecated
npm WARN deprecated gulp-util#3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm notice created a lockfile as package-lock.json. You should commit this file.
added 592 packages from 409 contributors and audited 5796 packages in 434.447s
found 24 vulnerabilities (13 low, 3 moderate, 8 high)
run `npm audit fix` to fix them, or `npm audit` for details
Bians-iMac:RCTWebRTCDemo byz$ npm audit fix
> fsevents#1.2.4 install /Volumes/STUDY/Work/MyHome/RCTWebRTCDemo/node_modules/fsevents
> node install
[fsevents] Success: "/Volumes/STUDY/Work/MyHome/RCTWebRTCDemo/node_modules/fsevents/lib/binding/Release/node-v57-darwin-x64/fse.node" already installed
Pass --update-binary to reinstall or --build-from-source to recompile
npm WARN react-native#0.56.0 requires a peer of react#16.4.1 but none is installed. You must install peer dependencies yourself.
+ react-native#0.56.0
added 407 packages from 157 contributors, removed 196 packages, updated 72 packages and moved 3 packages in 59.949s
fixed 20 of 24 vulnerabilities in 5796 scanned packages
1 package update for 4 vulns involved breaking changes
(use `npm audit fix --force` to install breaking changes; or refer to `npm audit` for steps to fix these manually)
Bians-iMac:RCTWebRTCDemo byz$ react-native link
Scanning folders for symlinks in /Volumes/STUDY/Work/MyHome/RCTWebRTCDemo/node_modules (9ms)
rnpm-install info Platform 'ios' module react-native-webrtc is already linked
rnpm-install info Linking react-native-webrtc android dependency
rnpm-install info Platform 'android' module react-native-webrtc has been successfully linked
Bians-iMac:RCTWebRTCDemo byz$ react-native run-android
Scanning folders for symlinks in /Volumes/STUDY/Work/MyHome/RCTWebRTCDemo/node_modules (11ms)
JS server already running.
Building and installing the app on the device (cd android && ./gradlew installDebug)...
File /Users/byz/.android/repositories.cfg could not be loaded.
FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring project ':WebRTCModule'.
> Could not resolve all dependencies for configuration ':WebRTCModule:_debugPublishCopy'.
> Could not find com.android.support:appcompat-v7:26.1.0.
Searched in the following locations:
file:/Users/byz/Library/Android/sdk/extras/android/m2repository/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom
file:/Users/byz/Library/Android/sdk/extras/android/m2repository/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.jar
file:/Volumes/STUDY/Work/MyHome/RCTWebRTCDemo/android/sdk-manager/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.jar
Required by:
RCTWebRTCDemo:WebRTCModule:unspecified > com.facebook.react:react-native:0.56.0
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 13.627 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/getting-started.html
Operating System: mac OS HighSierra 10.13.5
Android SDK: 23.0.2 & 26 installed.
Can anyone tell me how to fix this?
Thanks for your attention.

You might miss appcompat-v7:26.1.0 in your android sdk.
Try to change to 27.+. It might help!

Ionic2 - Android build failed

I was trying to build an Ionic2 app with Android platform on my Win 7 (32 bt) system.
I ran the ionic build android command in the CLI and the following error occurred :
...ionic build android
> ionic-hello-world# ionic:build D:\<path>
> ionic-app-scripts build
[20:12:32] ionic-app-scripts 1.0.0
[20:12:32] build dev started ...
[20:12:32] clean started ...
[20:12:32] clean finished in 10 ms
[20:12:32] copy started ...
[20:12:32] transpile started ...
[20:12:37] transpile finished in 5.47 s
[20:12:37] webpack started ...
[20:12:38] copy finished in 5.74 s
[20:12:49] webpack finished in 11.84 s
[20:12:49] sass started ...
[20:12:52] sass finished in 2.81 s
[20:12:52] build dev finished in 20.16 s
[20:12:58] tslint: D:/../src/app/app.component.ts, line: 3
Unused import: 'OneSignal'
L2: import { Platform } from 'ionic-angular';
L3: import { StatusBar, Splashscreen, OneSignal } from 'ionic-native';
ANDROID_HOME=C:\Users\<user-name>\AppData\Local\Android\android-sdk
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_60
Subproject Path: CordovaLib
Starting a new Gradle Daemon for this build (subsequent builds will be faster).
FAILURE: Build failed with an exception.
* What went wrong:
Unable to start the daemon process.
This problem might be caused by incorrect configuration of the daemon.
For example, an unrecognized jvm option is used.
Please refer to the user guide chapter on the daemon at https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html
Please read the following process output to find out more:
-----------------------
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
Then as suggested I read the 'https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html' and created the gradle.properties file with the following
org.gradle.daemon=true
The error still persists with the same result !!!
What is going wrong ?? Please help .

Found the solution after a hour long R&D.
Basically as per 'https://cordova.apache.org/docs/en/latest/guide/platforms/android/' - As of cordova-android#4.0.0, Cordova for Android projects are built using Gradle. Earlier it was built using Apache Ant.
Now Gradle looks for latest Android SDK. When I removed the android platform and added again with ionic platform add android command - the CLI listed that the latest Android SDK ( in my case it was SDK 24 ) was not installed.
I installed the required SDK version using Android SDK Manager and subsequent add of Android Platform along with the cordova plugin smoothly installed without any error.
The CLI printed the following -
..ionic plugin add onesignal-cordova-plugin
Fetching plugin "onesignal-cordova-plugin" via npm
Installing "onesignal-cordova-plugin" for android
ANDROID_HOME=C:\Program Files (x86)\Android\android-sdk
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_121
Subproject Path: CordovaLib
Incremental java compilation is an incubating feature.
:clean
:CordovaLib:clean
BUILD SUCCESSFUL
Total time: 1.611 secs
Subproject Path: CordovaLib

Try using cordova platform add https://github.com/apache/cordova-android
Ive had to start using this command ever since updating Ionic.

How to tell mvn to use local folder to solve Local Dependency issue for zxing's Android project

I downloaded zxing and tried to build it locally with mvn.
I got some problem, when I try to build android project (to make it a jar other than apk file), I got this error:
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------ ------
[INFO] Building Android Barcode Scanner app 4.7.1
[INFO] ------------------------------------------------------------------ ------
[WARNING] The POM for com.google.zxing:core:jar:3.1.1-SNAPSHOT is missing, no dependency information available
[WARNING] The POM for com.google.zxing:android-core:jar:3.1.1-SNAPSHOT is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.352 s
[INFO] Finished at: 2015-01-27T13:32:25+00:00
[INFO] Final Memory: 10M/36M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project android: Could not resolve dependencies for project com.google.zxing:android:jar:4.7.1: The following artifacts could not be resolved: com.google.zxing:core:jar:3.1.1-SNAPSHOT, com.google.zxing:android-core:jar:3.1.1-SNAPSHOT: Failure to find com.google.zxing:core:jar:3.1.1-SNAPSHOT in https://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
I put android-core-3.1.1-SNAPSHOT.JAR AND core-3.1.1-SNAPSHOT.JAR into the libs folder of android project, but it doesn't help at all.
what I am doing wrong? The pom file under android folder is
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>android-core</artifactId>
<version>3.1.1-SNAPSHOT</version>
<packaging>jar</packaging>(i changed from apk to jar as I want to build it as a jar other than apk)
<dependencies>
<dependency>
<groupId>com.google.android</groupId>
<artifactId>android</artifactId>
</dependency>
</dependencies>
<parent>
<groupId>com.google.zxing</groupId>
<artifactId>zxing-parent</artifactId>
<version>3.1.1-SNAPSHOT</version>
</parent>
<name>ZXing Android Core</name>
<description>Code common to Android applications</description>
</project>

This is just a Maven question. You have downloaded source code for master, so points to SNAPSHOT builds. If you really want to use that, you need to mvn install to create snapshot artifacts locally. Here you just went straight to android/ and built it, but that won't work. Just build everything from the top level and it will work.
This is described at https://github.com/zxing/zxing/wiki/Getting-Started-Developing except that if you are building snapshots off master you need to mvn install not mvn package.

Unable to build Android+Scala project using sbt+sbt-android plugin

I can't build Android + Scala (and IntelliJ Idea 12) project using sbt and sbt-android plugin. I installed everything needed and added ANDROID_SDK_HOME to both .bashrc and /etc/profile but:
me123#ubuntu:~/Documents/android_projects/my-android-project$ echo $ANDROID_SDK_HOME
/home/me123/android-sdk-linux/sdk
me123#ubuntu:~/Documents/android_projects/my-android-project$ sudo echo $ANDROID_SDK_HOME
/home/me123/android-sdk-linux/sdk
me123#ubuntu:~/Documents/android_projects/my-android-project$ sbt
[info] Loading global plugins from /home/me123/.sbt/plugins
[info] Loading project definition from /home/me123/Documents/android_projects/my-android-project/project
[info] Compiling 3 Scala sources to /home/me123/Documents/android_projects/my-android-project/project/target/scala-2.9.2/sbt-0.12/classes...
[error] /home/me123/Documents/android_projects/my-android-project/project/target/scala-2.9.2/sbt-0.12/classes/AndroidEclipse$Transformer.class (Permission denied)
[error] one error found
[error] (compile:compile) Compilation failed
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? q
me123#ubuntu:~/Documents/android_projects/my-android-project$ sudo sbt
[info] Loading project definition from /home/me123/Documents/android_projects/my-android-project/project
[info] Updating {file:/home/me123/Documents/android_projects/my-android-project/project/}default-6ff5da...
[info] Resolving org.scala-sbt#precompiled-2_10_0;0.12.2 ...
[info] Done updating.
[error] Android SDK not found. You might need to set ANDROID_SDK_HOME or ANDROID_SDK_ROOT or ANDROID_HOME
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? q
UPDATE:
> android:start-device
[info] Wrote /home/alex/Documents/android_projects/my-android-project/target/scala-2.10/src_managed/main/scala/my/android/project/TR.scala
[info] Compiling 2 Scala sources and 1 Java source to /home/alex/Documents/android_projects/my-android-project/target/scala-2.10/classes...
[warn] there were 4 feature warnings; re-run with -feature for details
[warn] one warning found
ProGuard, version 4.6
ProGuard is released under the GNU General Public License. You therefore
must ensure that programs that link to it (scala, ...)
carry the GNU General Public License as well. Alternatively, you can
apply for an exception with the author of ProGuard.
Reading program directory [/home/alex/Documents/android_projects/my-android-project/target/scala-2.10/classes]
[trace] Stack trace suppressed: run last main/android:proguard for the full output.
[error] (main/android:proguard) java.io.IOException: Can't read [/home/alex/Documents/android_projects/my-android-project/target/scala-2.10/classes] (Can't process class [my/android/project/R$id.class] (Unsupported version number [51.0] for class format))
[error] Total time: 14 s, completed May 30, 2013 3:49:46 PM

First, doing sudo echo $ANDROID_HOME will be exactly the same as echo $ANDROID_HOME, because the variable will be replaced by your shell before executing the command.
Then, you most likely have a permission problem. Try running this to make sure you have the right ones :
$ chmod -Rv 700 /home/me123/Documents/android_projects/my-android-project/

Android Maven Could not find tool 'aapt'

i was trying to follow this tutorial:
http://www.gdgankara.org/2012/11/01/step-by-step-android-development-with-maven/
but after setting up the environment, and create a project, at the "run as\maven install" step i got this:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building tutorial 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- android-maven-plugin:3.1.1:generate-sources (default-generate-sources) # tutorial ---
[INFO] ANDROID-904-002: Found aidl files: Count = 0
[INFO] ANDROID-904-002: Found aidl files: Count = 0
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.889s
[INFO] Finished at: Sat May 18 00:32:12 CEST 2013
[INFO] Final Memory: 8M/111M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.jayway.maven.plugins.android.generation2:android-maven-plugin:3.1.1:generate-sources (default-generate-sources) on project tutorial: Execution default-generate-sources of goal com.jayway.maven.plugins.android.generation2:android-maven-plugin:3.1.1:generate-sources failed: Could not find tool 'aapt'. Please provide a proper Android SDK directory path as configuration parameter <sdk><path>...</path></sdk> in the plugin <configuration/>. As an alternative, you may add the parameter to commandline: -Dandroid.sdk.path=... or set environment variable ANDROID_HOME. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
I've tried lot of times, but with no luck.
I have Eclipse Juno on Windows7 64 bit, APK Tool installed and Maven 3.0.5.
It seems a well known problem for maven staff:
https://code.google.com/p/maven-android-plugin/issues/detail?id=104
but it should be solved from ages...
My Environment User variables:
M2_HOME=C:\Program Files\Java\apache-maven-3.0.5
ANDROID_HOME=C:\adt-bundle-windows-x86_64-20130514\sdk
My Environment System variable:
Path=......;%ANDROID_HOME%\tools;%ANDROID_HOME%\platform-tools;%ANDROID_HOME%\build-tools;%ANDROID_HOME%\platforms;%M2_HOME%\bin;%ANDROID_HOME%\build-tools\android-4.2.2
Does anybody know how to workout this trap?
thanks!

I also encountered the same problem when using latest ADT from google and trying to compile the bootstrap android platform.
The latest r17 build separate out aapt to build-tools folder. Hence it is maven-android-plugin cannot support it.
See issue discussed here.
Tried and working:
cd $ANDROID_HOME/platform-tools
ln -s ../build-tools/android-4.2.2/aapt aapt
ln -s ../build-tools/android-4.2.2/lib lib
ln -s ../build-tools/android-4.2.2/aidl aidl
Some installations may be structured using the API version:
cd $ANDROID_HOME/platform-tools
ln -s ../build-tools/17.0.0/aapt aapt
ln -s ../build-tools/17.0.0/lib lib
ln -s ../build-tools/17.0.0/aidl aidl
Keep in mind that this is fixed in the latest version (>3.5.3) of the Android Maven Plugin, as other answers point out.

Update:
This has been resolved since Android Maven Plugin v3.6.0. For now you will only need these symlinks if you use IntelliJ v12.x. IntelliJ v13 EAP+ should work out of the box.
Original answer:
This has been fixed and will be released with Android Maven Plugin v3.5.4. See the github pull request:
Upgraded AndroidSdk to use path and platform utilities from sdklib
You can try validating the snapshot build which contains the fix by adding the following to your pom.xml:
<plugin>
<groupId>com.jayway.maven.plugins.android.generation2</groupId>
<artifactId>android-maven-plugin</artifactId>
<version>3.5.4-SNAPSHOT</version>
...
</plugin>
...
<pluginRepositories>
<pluginRepository>
<id>oss.sonatype.org-jayway-snapshots</id>
<name>Jayway OpenSource SNAPSHOTs on Sonatype.org</name>
<url>http://oss.sonatype.org/content/repositories/jayway-snapshots/</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
Please provide feedback on the developer group:
New snapshot for 3.5.4 available

If you are using Windows, the symbolic linking can be done using mklink command.
D:\>cd "Program Files (x86)\Android\android-sdk"
D:\Program Files (x86)\Android\android-sdk>cd platform-tools
D:\Program Files (x86)\Android\android-sdk\platform-tools>mklink aapt.exe ..\build-tools\17.0.0\aapt.exe
symbolic link created for aapt.exe <<===>> ..\build-tools\17.0.0\aapt.exe
D:\Program Files (x86)\Android\android-sdk\platform-tools>mklink aidl.exe ..\build-tools\17.0.0\aidl.exe
symbolic link created for aidl.exe <<===>> ..\build-tools\17.0.0\aidl.exe
D:\Program Files (x86)\Android\android-sdk\platform-tools>mklink /d lib ..\build-tools\17.0.0\lib
symbolic link created for lib <<===>> ..\build-tools\17.0.0\lib

I get stuck with the same problem. Finally i managed to resolve the issue after two hours. To make it simple and resolve the issue in 5 minutes i listed the steps below
Step 1 - In Eclipse update your Android Maven Plugin to 0.4.3.2013 using the beta release link
http://rgladwell.github.io/m2e-android/updates/master/
Step 2
<plugin>
<groupId>com.jayway.maven.plugins.android.generation2</groupId>
<artifactId>android-maven-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<sdk>
<platform>17</platform>
</sdk>
</configuration>
</plugin>
It will solve the following issues
"No Android Platform Version/API Level has been configured"
Could not find tool 'aapt'
Hope it helps

I too had similar problems.
Solved by following steps :
1) Upgrade maven to 3.1.1
2) Use android-maven-plugin 3.6.1 pr greater [I used 3.8.0]
3) Use maven-dependency-plugin 2.8
If you want to build against latest Android SDK [ex : 4.3], follow following additional steps -
4) Install the local copy of android.jar using command mvn install:installFile ..
5) Set 18
Hope this helps.

I'm using macOS 10.14 and in my case:
I download Android packaging tool from AAPT and then copied all the files into $ANDROID_HOME/platforms/$SDK/tools/
DON'T REMIND CHANGE $SDK WITH YOUR REAL NAME SDK FOR INSTANCE android-29