全局获取Context的技巧

• 全局编写一个MyApplication方法

package com.example.jatpackdemo

import android.annotation.SuppressLint
import android.app.Application
import android.content.Context

/**
 * 定义全局的Context以方便获取
 */
class MyApplication : Application() {

    companion object {
        @SuppressLint("StaticFieldLeak")
        lateinit var context: Context
    }

    override fun onCreate() {
        super.onCreate()
        context = applicationContext
    }
}

• 设置Application

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.jatpackdemo">

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.JatpackDemo">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

• 使用MyApplication中的Context即可

            count.toString().showToast(MyApplication.context)