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/**
 * Gets the SSID of the currently associated WiFi access point if there is one. Otherwise,
 * returns empty string.
 */
@CalledByNative
public static String getWifiSSID(Context context) {
    if (context == null) {
        return "";
    }
    final Intent intent = context.registerReceiver(

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String details = "VERSION.RELEASE : " + Build.VERSION.RELEASE
                                    + "\nVERSION.INCREMENTAL : " + Build.VERSION.INCREMENTAL
                                    + "\nVERSION.SDK.NUMBER : " + Build.VERSION.SDK_INT
                                    + "\nBOARD : " + Build.BOARD
                                    + "\nBOOTLOADER : " + Build.BOOTLOADER
                                    + "\nBRAND : " + Build.BRAND
                                    + "\nCPU_ABI : " + Build.CPU_ABI
                                    + "\nCPU_ABI2 : " + Build.CPU_ABI2
                                    + "\nDISPLAY : " + Build.DISPLAY
                                    + "\nFINGERPRINT : " + Build.FINGERPRINT

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res/values/dimens.xml(default)
res/values-ldpi/dimens.xml   (240x320 and nearer resolution)
res/values-mdpi/dimens.xml   (320x480 and nearer resolution)
res/values-hdpi/dimens.xml   (480x800, 540x960 and nearer resolution)
res/values-xhdpi/dimens.xml  (720x1280 - Samsung S3, Micromax Canvas HD, etc) 
res/values-xxhdpi/dimens.xml (1080x1920 - Samsung S4, HTC one, etc)
res/values-large/dimens.xml  (480x800)

res/values-large-mdpi/dimens.xml (600x1024)
res/values-sw600dp/dimens.xml  (600x1024)

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import { PropTypes } from "prop-types";
import React, { Component } from "react";
import {
  Animated,
  Dimensions,
  Keyboard,
  StyleSheet,
  TextInput,
  UIManager,
  TouchableWithoutFeedback

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...
expo > ios > infoPlist
          "NSFaceIDUsageDescription": "This app use face id authentication."
...

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import {useState} from 'react';

const App = () => {
  const initialState = [
    {id: 1, country: 'Austria'},
    {id: 2, country: 'Belgium'},
    {id: 3, country: 'Canada'},
  ];

  const [data, setData] = useState(initialState);

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const perc2color = (perc: number) => {
  var r, g, b = 0;
  if (perc < 50) {
    r = 255;
    g = Math.round(5.1 * perc);
  }
  else {
    g = 255;
    r = Math.round(510 - 5.10 * perc);
  }

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import React, { useState } from 'react'
import { StyleSheet, TouchableOpacity, View, Text, Alert } from 'react-native'
import RNFS from 'react-native-fs'

const perc2color = (perc: number) => {
  var r, g, b = 0
  if (perc < 50) {
    r = 255
    g = Math.round(5.1 * perc)
  }