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@@ -1,4 +1,87 @@
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### やりたいこと
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掲題の通りです。
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画面を立ち上げる機能はkotlinにありますか？
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4
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-
javaでなければ実装できないでしょうか？
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4
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javaでなければ実装できないでしょうか？
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### ソース
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```MainActivty
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package com.example.myapplication
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import android.app.AlarmManager
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import android.app.PendingIntent
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import android.content.BroadcastReceiver
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import android.content.Context
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import android.content.Intent
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import android.os.Bundle
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import android.util.Log
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import android.widget.Button
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import androidx.appcompat.app.AppCompatActivity
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import java.util.*
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class MainActivity : AppCompatActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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val btn: Button = findViewById(R.id.btn)
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btn.text = "before"
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btn.setOnClickListener {
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// 時間をセットする
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val calendar: Calendar = Calendar.getInstance()
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// Calendarを使って現在の時間をミリ秒で取得
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calendar.setTimeInMillis(System.currentTimeMillis())
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// 5秒後に設定
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calendar.add(Calendar.SECOND, 5)
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val intent = Intent(
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applicationContext,
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AlarmBroadcastReceiver::class.java
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)
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val pending = PendingIntent.getBroadcast(
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applicationContext, 0, intent, 0
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)
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// アラームをセットする
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val am = getSystemService(ALARM_SERVICE) as AlarmManager
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am.setExact(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, pending)
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}
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}
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}
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class AlarmBroadcastReceiver : BroadcastReceiver() {
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override fun onReceive(context: Context?, intent: Intent?) {
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val intent = Intent(context, MainActivity::class.java)
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intent.action = "received"
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val pIntent = PendingIntent.getActivity(context, 0, intent, 0)
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pIntent.send()
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}
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}
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```
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```AndroidManifest
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.example.myapplication">
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<uses-permission android:name="android.permission.WAKE_LOCK"/>
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/Theme.MyApplication">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<receiver android:name=".AlarmBroadcastReceiver"/>
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</application>
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</manifest>
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```
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