LocalBroadcast本地广播创建

MainActivity.kt --->

package com.example.fredric.localbroadcastreceiver

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v4.content.LocalBroadcastManager
import android.widget.Button
import android.widget.Toast

class MainActivity : AppCompatActivity() {

    var intentFilter: IntentFilter? = null
    var localReceiver: LocalReceiver? = null
    var localBroadcastManager: LocalBroadcastManager? = null
    var sendLocalBroadcastBtn: Button? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        localBroadcastManager = LocalBroadcastManager.getInstance(this)
        sendLocalBroadcastBtn = findViewById<Button>(R.id.send_local_broadcast)
        sendLocalBroadcastBtn?.setOnClickListener({
            var intent = Intent("com.example.broadcasttest.LOCAL_BROADCAST")
            localBroadcastManager?.sendBroadcast(intent)
        })

        intentFilter = IntentFilter()
        intentFilter?.addAction("com.example.broadcasttest.LOCAL_BROADCAST")
        localReceiver = LocalReceiver()
        localBroadcastManager?.registerReceiver(localReceiver,intentFilter)
    }

    override fun onDestroy() {
        super.onDestroy()
        localBroadcastManager?.unregisterReceiver(localReceiver)
    }

    class LocalReceiver : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            Toast.makeText(context,"receive local broadcast!!",Toast.LENGTH_SHORT).show()
        }
    }
}

AndroidManifest.xml --->

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity">

    <Button

        android:id="@+id/send_local_broadcast"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Send Local Broadcast"

        android:textAllCaps="false"/>

</LinearLayout>

成图效果：