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apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 30

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1

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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
consumerProguardFiles "consumer-rules.pro"

proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

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testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

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Android Recyclerview GridLayoutManager column spacing Here is the question, the first answer does not work well in my project,and it makes the spacing bigger between item and item. the second answer is quite perfect.But if RecyclerView has headers,it does not work well. Then I fixed it.

import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**

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fun Date.toCalendar(): Calendar {
    val calendar = Calendar.getInstance()
    calendar.time = this
    return calendar
}

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import Foundation

extension Data {
    var prettyPrintedJSONString: NSString? { /// NSString gives us a nice sanitized debugDescription
        guard let object = try? JSONSerialization.jsonObject(with: self, options: []),
              let data = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted]),
              let prettyPrintedString = NSString(data: data, encoding: String.Encoding.utf8.rawValue) else { return nil }

        return prettyPrintedString
    }

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fun getAllShownImagesPath(activity: Activity): MutableList<Uri> {
        val uriExternal: Uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
        val cursor: Cursor?
        val columnIndexID: Int
        val listOfAllImages: MutableList<Uri> = mutableListOf()
        val projection = arrayOf(MediaStore.Images.Media._ID)
        var imageId: Long
        cursor = activity.contentResolver.query(uriExternal, projection, null, null, null)
        if (cursor != null) {
            columnIndexID = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID)

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importPackage(android.content);
importPackage(android.app);
importClass(android.widget.Toast);
const CHANNEL_ID = "call_owner";

const ignoreActionName = "msgbot.call_owner.ignore";//그냥 시스템 전반적으로 유니크하게 하시면 됩니다.
const replyActionName="msgbot.call_owner.reply";
const replyKey="key_reply";
const bot = BotManager.getCurrentBot();
let repliers={};

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<?xml version="1.0" encoding="utf-8"?>
<resources>

<!-- google's material design colours from 
http://www.google.com/design/spec/style/color.html#color-ui-color-palette -->

    <!--reds-->
    <color name="md_red_50">#FFEBEE</color>
    <color name="md_red_100">#FFCDD2</color>
    <color name="md_red_200">#EF9A9A</color>

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package rupantor.cusedittext;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.EditText;