Develop Reference

Error:Failed to resolve: Crosswalk

I'm trying to make a SDK using Crosswalk. So first I started to make a sample app using
compile 'org.xwalk:xwalk_core_library:23.53.589.4'. And it works. Then I tried to make a SDK using this. But it didn't work as I expected.
gradle file
apply plugin: 'com.android.library'
repositories {
maven {
url 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2'
}
}
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
defaultConfig {
minSdkVersion 16
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
compile 'org.xwalk:xwalk_core_library:23.53.589.4'
testCompile 'junit:junit:4.12'
}
Here is the screenshot of error message

Gradle sync failed: Plugin with id 'com.android.application' not found

I have updated my Android Studio from 2.x to 3.x. At first it showed gradle sync failed, then I fixed it somehow with the help of Stack Overflow. In that process I updated gradle. It fixed for some time later by following the steps in the Stack Overflow post. I deleted one file in gradle, now this is came out:
Gradle sync failed: Plugin with id 'com.android.application' not found
Please any one tell me how to fix it.
here is the file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.demoandroid.udacitybdcard"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-
rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',
{
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.0'
testCompile 'junit:junit:4.12'}

Error:Invalid byte 1 of 1-byte UTF-8 sequence. in android studio

Getting below error in android studio.
Gradle sync failed: Invalid byte 1 of 1-byte UTF-8 sequence.
my gradle file is as below. i cannot find the solution. now the same error is getting in all my projects.
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "com.example.myapp"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:recyclerview-v7:25.3.1'
testCompile 'junit:junit:4.12'
}

Got the same issue...
finally change my classpath in the project build.gradle ... for my case in example it was
com.android.tools.build:gradle:2.3.3
I first pass it to
com.android.tools.build:gradle:2.3.+
and once the gradle synced turn it back to
com.android.tools.build:gradle:2.3.3

Failed to resolve javax

I created a new Application and I am getting these errors
This is my app level
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
applicationId "com.vfirst.genie"
minSdkVersion 15
targetSdkVersion 24
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
testCompile 'junit:junit:4.12'
}

Download the latest version of Android Support Repository, Android Support Library and Google Repository from your SDK Manager.
I think it should solve the issue.

After import to android studio, gradle task “app:dexDebug” fails

I have the following gradle file in my android app:
apply plugin: 'com.android.application'
android {
compileSdkVersion 20
buildToolsVersion "20.0.0"
defaultConfig {
applicationId "com.example.test.forum"
minSdkVersion 16
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
//configurations {
// all*.exclude group: 'com.android.support', module: 'support-v4'
//}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:19+'
compile 'org.java-websocket:Java-WebSocket:1.3.0'
}
and the bug output is Error code: 2; Output: UNEXPECTED TOP-LEVEL EXCEPTION.
When I uncomment the configurations part of the file I get Can't find package v4 (support) although I have it installed from the sdk. Any ideas on how I can solve this?