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Output :
C:\Users\Rida\start_app\android>./gradlew clean
'.' is not recognized as an internal or external command, operable program or batch file.

Solution : 
==========

How to Configure Gradle?

1. Download the zipped file of Gradle from https://services.gradle.org/distributions/gradle-2.8-all.zip.

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Unexpected Output
=================
    C:\Users\Rida\Documents\start>react-native init sample
    This will walk you through creating a new React Native project in C:\Users\Rida\Documents\start\sample
    Using yarn v1.2.1
    Installing react-native...
    yarn add v1.2.1
    warning ..\..\..\package.json: No license field
    info No lockfile found.
    [1/4] Resolving packages...

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goto cmd and write command:
==========================

keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

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This post outlines how to get custom fonts working reliably in React Native.

Most crucially, our font files have to be named correctly. I recommend using the following format for file names:

OpenSans.ttf - Regular weight
OpenSans-Italic.ttf - Regular weight, Italic style
OpenSans-Light.ttf - Light weight
OpenSans-LightItalic.ttf - Light weight, Italic style
OpenSans-SemiBold.ttf - Semi-bold weight
OpenSans-SemiBoldItalic.ttf - Semi-bold weight, Italic style

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1. Make it look like the icon the user taps grows to fill the entire screen making for a seamless transition.
2. Keep it simple. A splash screen should only show for a few milliseconds. It shouldn’t have a lot of information on it — it is, after all, a dreaded loading screen.
3. With all of this in mind we’ll start with a a square image at three sizes (@1x = 200px, @2x = 400px, @3x = 600px).

Preparing the App
If you’ve tried to set up a splash screen in React Native then you may have experience a white screen flash before your content loads. If your app has a white background this is often not very noticable, but it’s still a pain. Today we’re going to make it very noticable if we have any flashes of white. To do that we’ll set a dark background color in our app.

Replace App.js with

import React, { Component } from 'react';

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clean cache with

npm cache clean --force

install the latest version of npm globally as admin:

npm install -g npm@latest --force

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rm -rf ios/build/; kill $(lsof -t -i:8081);react-native run-ios

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Clear Cache Mac

• watchman watch-del-all
• rm -rf $TMPDIR/react-*
• rm -rf node_modules/
• rm -rf build/ios
• npm cache verify
• yarn cache clean
• pc restart
• yarn install

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keytool -list -v -keystore "C:\Users\Rida.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

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1. npm install -g rimraf

#2. discard terminal open again

rimraf -r (your query)

e.g: rimraf -r TMPDIR/react-*