dagger2 + rxjava + retrofit / MVP

dependencies.gradle

// build.gradle
Map<String, String> dependency = rootProject.ext.dependencies;

compile dependency.v4
compile dependency.v7
compile dependency.gson
compile dependency.guava
compile dependency.logger
compile dependency.junit

Strings
    emptyToNull(String)
    nullToEmpty(String)
    isNullOrEmpty(String)
    ...
    
Lists
    newArrayList()
    newLinkedList()
    newCopyOnWriteArrayList()
    ...
    
Sets
    newHashSet()
    newTreeSet()
    newLinkedHashSet()
    newIdentityHashSet()
    newCopyOnWriteArraySet()
    ...
    
Maps
    newHashMap()
    newLinkedHashMap()
    newConcurrentHashSet()
    newCopyOnWriteArraySet()
    ...
     
Queues
    newArrayDeque()
    newPriorityQueue()
    newSynchronousQueue()
    newLinkedBlockingDeque()
    newConcurrentLinkedQueue()
    newPriorityBlockingQueue()
    ...

Caches
    Cache<Object, Object> caches = CacheBuilder.newBuilder()
        .maximumSize(1000)
        .expireAfterWrite(10, TimeUnit.MINUTES)
        .removalListener(listener)
        .build();
        
Files
    copy(File from, File to)
    write(byte[] from, File to)
    newWriter(File file, Charset charset)
    newReader(File file, Charset charset)
    toByteArray(File file)
    toString(File file, Charset charset)