rahulkhatri19

Helpful Links
------

- [Google Doc - Room Db Query](https://developer.android.com/reference/android/arch/persistence/room/Query)

- [Google Doc - Accessing data from Dao](https://developer.android.com/training/data-storage/room/accessing-data)

- [Android Room: Handling Relations Using LiveData](https://proandroiddev.com/android-room-handling-relations-using-livedata-2d892e40bd53)

- [SQLite on Android Made Simple: Room Persistence Library with a Touch of RxJava](https://android.jlelse.eu/sqlite-on-android-made-simple-room-persistence-library-with-a-touch-of-rxjava-55e8dc5301cf)

rahulkhatri19

// package com.example.

import android.graphics.drawable.Drawable
import android.graphics.drawable.PictureDrawable
import android.widget.ImageView
import com.bumptech.glide.RequestBuilder
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.engine.GlideException
import com.bumptech.glide.request.RequestListener
import com.bumptech.glide.request.target.ImageViewTarget

rahulkhatri19

Kotlin Basic:

1. Null safe operator (?) :
 println(name?.toUpperCase())  // if upper case then print name in uppercase else print null.
 in java :
 if (name.toUppercase != null){
  print(name.toUpperCase())
 } else print("null")

2. Not null assert(!!): 

rahulkhatri19

//  Call printHashKey(this) method in onCreate method.

fun printHashKey(context: Context) {
try {
val info =
context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES)
for (signature in info.signatures) {
val md = MessageDigest.getInstance("SHA")
md.update(signature.toByteArray())
val hashKey = String(Base64.encode(md.digest(), 0))

rahulkhatri19

Release hash key:
keytool -exportcert -alias alias_name -keystore keystore_path | openssl sha1 -binary | openssl base64

playstore key hash : echo SHA_1_key  | xxd -r -p | openssl base64    // here playstore Sha_1_key, get by playstore console.

rahulkhatri19

// Customizing title of Alertdilaog.
val builder = AlertDialog.Builder(this, R.style.CustomAlertDialog)
val tvTitle= TextView(this)
tvTitle.text = "Title of Alert Dialog!"
tvTitle.textSize = this.resources.getDimension(R.dimen.snack_bar_text_size)
builder.setCustomTitle(tvTitle)

// Cuatom default button
<style name="CustomAlertDialog" parent="@android:style/Theme.Dialog">   //  for white : Theme.AppCompat.Light.Dialog.Alert
        <item name="android:textSize">@dimen/snack_bar_text_size</item>

rahulkhatri19

var count = 0
fun main(args: Array<String>) {
    println("Enter string to Count Vowels: ")
    val inputSt: String? = readLine()!!
//    val inputSt: String? = "Hi this to check"
    print(checkforVowel(inputSt, inputSt?.length))
}

fun checkforVowel(inputSt: String?, length: Int?): Int {
    if (length == 1){

rahulkhatri19

Dagger Dependency Injection

1. Setting Up Dagger:

app: build.gradle

apply plugin: 'kotlin-kapt'
ext {
    dagger_version = '2.17'
    auto_value_version = '1.6.2'

rahulkhatri19

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: SwitchApp()));
}

class SwitchApp extends StatefulWidget {
  @override
  _switch createState() => new _switch();
}

rahulkhatri19

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: SliderApp()));
}

class SliderApp extends StatefulWidget {
  @override
  _slider createState() => new _slider();
}