Develop Reference

Butterknife NullPointerException with ViewPager [duplicate]

When i'm trying to do this:
...
public class LoginActivity extends AppCompatActivity {
#BindView(R.id.login_form) View loginForm;
...
loginForm is getting null. I tried to follow other answers and nothing worked (this for example). I also did exactly what it said in the butterKnife configuration page and it didn't work. What am I doing wrong?
module gradle:
apply plugin: 'com.android.application'
apply plugin: 'com.jakewharton.butterknife'
android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "name"
minSdkVersion 22
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.jakewharton:butterknife:8.6.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.6.0'
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'uk.co.chrisjenx:calligraphy:2.3.0'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
Project gradle:
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.jakewharton:butterknife-gradle-plugin:8.6.0'

Probably, you forget to put this line:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.simple_activity);
ButterKnife.bind(this);
...
}

In onCreate you have to call
ButterKnife.Bind(this)
before you use the views
Also add mavenCentral() to repositories in gradle
repositories {
jcenter()
mavenCentral()
}

Android realm cannot resolve symbol SyncCredentials, SyncUser, ObjectServerError. But Realm, RealmObject.. classes are working fine

I have taken code from Realm objectServerExample.
SyncCredentials creds = SyncCredentials.usernamePassword(username, password, createUser);
SyncUser.Callback<SyncUser> callback = new SyncUser.Callback<SyncUser>() {
#Override
public void onSuccess(#Nonnull SyncUser user) {
progressDialog.dismiss();
onLoginSuccess();
}
#Override
public void onError(#Nonnull ObjectServerError error) {
progressDialog.dismiss();
String errorMsg;
switch (error.getErrorCode()) {
case UNKNOWN_ACCOUNT:
errorMsg = "Account does not exists.";
break;
case INVALID_CREDENTIALS:
errorMsg = "User name and password does not match";
break;
default:
errorMsg = error.toString();
}
onLoginFailed(errorMsg);
}
};
It says Cannot resolve symbol SyncCredentials
io.realm.Realm class is working.
My project level gradle file
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath "io.realm:realm-gradle-plugin:3.7.2"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
classpath 'com.jakewharton:butterknife-gradle-plugin:8.8.1'
classpath 'me.tatarka:gradle-retrolambda:3.7.0'
}
}
allprojects {
repositories {
jcenter()
maven { url 'https://maven.google.com' }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Gradle (module:app)
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
apply plugin: 'com.jakewharton.butterknife'
apply plugin: 'me.tatarka.retrolambda'
android {
compileSdkVersion 26
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "com.amit.database"
minSdkVersion 22
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
// jackOptions {
// enabled true
// }
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
configurations.all {
resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
}
}
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.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
compile "android.arch.lifecycle:runtime:1.0.0-alpha9"
compile "android.arch.lifecycle:extensions:1.0.0-alpha9"
annotationProcessor "android.arch.lifecycle:compiler:1.0.0-alpha9"
compile group: 'com.google.guava', name: 'guava', version: '22.0-android' // or 22.0-android for the Android flavor
compile 'com.android.support:design:25.3.1'
}
Main goal is to connect Android app with realm object server on aws-ec2. It is working and can be accessed from browser.

Add
realm {
syncEnabled = true
}
in gradle (module:app) to use realm sync feature
So final Gradle (module:app)
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
apply plugin: 'com.jakewharton.butterknife'
apply plugin: 'me.tatarka.retrolambda'
android {
compileSdkVersion 26
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "com.amit.database"
minSdkVersion 22
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
// jackOptions {
// enabled true
// }
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
configurations.all {
resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
}
}
realm {
syncEnabled = true
}
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.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
compile "android.arch.lifecycle:runtime:1.0.0-alpha9"
compile "android.arch.lifecycle:extensions:1.0.0-alpha9"
annotationProcessor "android.arch.lifecycle:compiler:1.0.0-alpha9"
compile group: 'com.google.guava', name: 'guava', version: '22.0-android' // or 22.0-android for the Android flavor
compile 'com.android.support:design:25.3.1'
}

butterKnife returns null when binding view (8.6.0)

When i'm trying to do this:
...
public class LoginActivity extends AppCompatActivity {
#BindView(R.id.login_form) View loginForm;
...
loginForm is getting null. I tried to follow other answers and nothing worked (this for example). I also did exactly what it said in the butterKnife configuration page and it didn't work. What am I doing wrong?
module gradle:
apply plugin: 'com.android.application'
apply plugin: 'com.jakewharton.butterknife'
android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "name"
minSdkVersion 22
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.jakewharton:butterknife:8.6.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.6.0'
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'uk.co.chrisjenx:calligraphy:2.3.0'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
Project gradle:
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.jakewharton:butterknife-gradle-plugin:8.6.0'

Probably, you forget to put this line:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.simple_activity);
ButterKnife.bind(this);
...
}

In onCreate you have to call
ButterKnife.Bind(this)
before you use the views
Also add mavenCentral() to repositories in gradle
repositories {
jcenter()
mavenCentral()
}

Configuring Android Annotations v3.0.1 with Android Studio (Beta) 0.8.4

Configuring Android Annotations is quite irksome. But I finally figured out a solution and wish to share with everyone.

Use the below mentioned gradle buildscript.
Following are some of the references:
1) https://github.com/excilys/androidannotations/blob/develop/examples/gradle/build.gradle
2) https://bitbucket.org/hvisser/android-apt
3) http://www.jayway.com/2014/02/21/androidannotations-setup-in-android-studio/
build.gradle
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.12.1'
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
}
}
apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'
repositories {
mavenCentral()
}
ext.androidAnnotationsVersion = '3.0.1';
configurations {
apt
}
android {
compileSdkVersion 19
buildToolsVersion "19.1.0"
useOldManifestMerger true
defaultConfig {
minSdkVersion 14
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/license.txt'
exclude 'META-INF/notice.txt'
}
}
dependencies {
compile 'com.android.support:support-v4:20.0.+'
compile 'com.android.support:appcompat-v7:20.0.+'
apt "org.androidannotations:androidannotations:${androidAnnotationsVersion}"
compile "org.androidannotations:androidannotations-api:${androidAnnotationsVersion}"
compile fileTree(dir: 'libs', include: '*.jar')
}
apt {
arguments {
resourcePackageName 'com.yourpackage.name'
androidManifestFile variant.processResources.manifestFile
}
}

Android Studio with Robolectric: my class test is not found

This is my gradle file:
apply plugin: 'android'
apply plugin: 'android-test'
android {
// Check on it to know witch Android API level is necessary:
// http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels
compileSdkVersion 19
buildToolsVersion '19.0.1'
defaultConfig {
minSdkVersion 14
targetSdkVersion 19
versionCode 1
versionName "1.0"
testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
sourceSets {
androidTest {
setRoot('src/test')
}
}
// Patch: http://stackoverflow.com/questions/20673888/duplicate-files-copied-android-studio-0-4-0
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/license.txt'
exclude 'META-INF/NOTICE.txt'
exclude 'META-INF/notice.txt'
exclude 'META-INF/ASL2.0'
}
}
androidTest {
include '**/*Test.class'
exclude '**/espresso/**/*.class'
}
dependencies {
// Android SDK Extra librairies
compile 'com.android.support:support-v4:19.0.+'
compile 'com.android.support:appcompat-v7:19.0.+'
compile fileTree(dir: 'libs', include: ['*.jar'])
// Android testing
// http://robolectric.org/
androidTestCompile 'junit:junit:4.+'
androidTestCompile 'org.robolectric:robolectric:2.+'
androidTestCompile 'com.squareup:fest-android:1.0.+'
// had to deploy to sonatype to get AAR to work
//compile 'com.novoda:actionbarsherlock:4.3.2-SNAPSHOT'
}
This my root gradle file:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
maven { url "http://dl.bintray.com/populov/maven" }
mavenCentral()
maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
}
dependencies {
classpath 'com.android.tools.build:gradle:0.9.+'
//classpath 'com.neenbedankt.gradle.plugins:android-apt:1.2+'
//classpath 'com.novoda.gradle:robolectric-plugin:0.0.1-SNAPSHOT'
classpath 'org.robolectric.gradle:gradle-android-test-plugin:0.10.+'
}
}
allprojects {
repositories {
maven { url "http://dl.bintray.com/populov/maven" }
mavenCentral()
maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
}
}
I just write an easy class to test to validate my infrastructure test, but I have this error:
Class not found: "com.example.myapp.activity.BaseActivityTest"
My test class is:
package com.example.myapp.activity;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import static org.junit.Assert.*;
#RunWith(RobolectricTestRunner.class)
public class BaseActivityTest {
#Test
public void testTrueIsTrue() throws Exception {
assertEquals(true, true);
}
}
My folder architecture is:
myapp
src
main
java
com.example.myapp ...
test
java
com.example.myapp ...
I don't understand why this error appears.

Ok guys, I found a solution:
This is my gradle file:
apply plugin: 'android'
apply plugin: 'robolectric'
android {
// Check on it to know witch Android API level is necessary:
// http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels
compileSdkVersion 19
buildToolsVersion '19.0.1'
defaultConfig {
minSdkVersion 14
targetSdkVersion 19
versionCode 1
versionName "1.0"
testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
sourceSets {
androidTest {
setRoot('src/test')
}
}
}
// prevent the "superClassName is empty" error for classes not annotated as tests
tasks.withType(Test) {
scanForTestClasses = false
include "**/*Test.class" // whatever Ant pattern matches your test class files
}
dependencies {
// Android SDK Extra librairies
compile 'com.android.support:support-v4:19.0.+'
compile 'com.android.support:appcompat-v7:19.0.+'
compile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
// Android testing
//androidTestCompile configurations.androidTestCompile.dependencies
// http://robolectric.org/
androidTestCompile 'org.robolectric:robolectric:2.+'
androidTestCompile 'junit:junit:4.+'
}
And I modified my VM argument (Configuration edition) like this post: http://blog.futurice.com/android_unit_testing_in_ides_and_ci_environments