jungilhan

{"schemaVersion":1,"label":"ktx","message":"1.0.0-rc12","color":"yellow"}

jungilhan

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  ...

  selectionTracker = SelectionTracker.Builder(
      "selection-demo",
      recyclerView,
      StableIdKeyProvider(recyclerView),
      itemDetailsLookup,
      StorageStrategy.createLongStorage())

jungilhan

private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<Int>() {
    override fun areItemsTheSame(oldItem: Int?, newItem: Int?) =
        oldItem == newItem // check uniqueness

    override fun areContentsTheSame(oldItem: Int?, newItem: Int?) =
        oldItem ==  newItem // check contents
}

jungilhan

class MainActivity : AppCompatActivity() {
  private val numbersObservable: BehaviorSubject<List<Int>>
          = BehaviorSubject.createDefault(listOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9))

  override fun onCreate(savedInstanceState: Bundle?) {
    ...

    swipeRefreshLayout.setOnRefreshListener {
      numbersObservable.onNext(listOf(1, 2, 4, 5, 6, 7, 8, 9)) // pass a new list without 0, 3
    }

jungilhan

class NumberViewHolder(parentView: View) : RecyclerView.ViewHolder(
    LayoutInflater.from(parentView.context).inflate(R.layout.card_item, null, false)) {

    private val numberView = itemView.findViewById<TextView>(R.id.number)

    fun bindTo(position: Int) {
        numberView.text = "# $position"
    }
}

jungilhan

class NumberListAdapter : ListAdapter<Int, ViewHolder>(object : DiffUtil.ItemCallback<Int>() {
  override fun areItemsTheSame(oldItem: Int?, newItem: Int?) =
      oldItem == newItem // check uniqueness

  override fun areContentsTheSame(oldItem: Int?, newItem: Int?) =
      oldItem ==  newItem // check contents
}) {

  ...                             
}

jungilhan

<provider
    android:authorities="${applicationId}.yourcontentprovider"
    android:name=".YourContentProvider"
    android:exported="false" />

jungilhan

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:name="package.of.MyApplication"
    ... >

jungilhan

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        SomeSdk.init(this);  // init some SDK, MyApplication is the Context
    }
}

jungilhan

import cv2
import numpy as np

img = cv2.imread('sudoku.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

gray = cv2.GaussianBlur(gray, (7, 7), 0)
thresh = cv2.adaptiveThreshold(gray, 255, 1, 1, 7, 2)

contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)