BroadCastReceiver

BroadCastReceiver

와이파이 인터넷 네트워크 체크할 때 주로 사용하는 4대 컴포넌트 중에 하나

 

textStyle

bold - 굵게

italic - 기울기를 주는 글씨체

normal - 일반 기본 글씨체

 

Intent의 종류

명시적 Intent

암시적 Intent

 

Intent 와 IntentFilter의 차이점

Intent - 기능을 가져와 쓰는 것

IntentFilter - Intent와 반대

 

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activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_state"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="khon"
        android:textSize="30sp"
        android:textColor="#38EFEF"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

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MainActivity.java

package com.example.broadcastreceiver;

import androidx.appcompat.app.AppCompatActivity;

import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public static TextView tv_state;
    private NetworkReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv_state = findViewById(R.id.tv_state);

        // 브로드 캐스트 리시버 등록
        IntentFilter filter = new IntentFilter();
        receiver = new NetworkReceiver();
        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        registerReceiver(receiver,filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 브로드 캐스트 리시버 해제
        unregisterReceiver(receiver);
    }
}

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java파일 생성

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NetworkReceiver.java

package com.example.broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.NetworkInfo;
import android.net.wifi.WifiManager;

public class NetworkReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 네트워크 상태 값 받아오기
        if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {
            NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            NetworkInfo.DetailedState state = info.getDetailedState();
            if (state == NetworkInfo.DetailedState.CONNECTED) { // 네트워크 연결 상태이면...
                MainActivity.tv_state.setText("네트워크 연결 완료");
            } else if (state == NetworkInfo.DetailedState.DISCONNECTED) { // 네트워크 연결 해제이면...
                MainActivity.tv_state.setText("네트워크 연결 해제");
            }
        }
    }
}

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AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.broadcastreceiver">
    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

    <application
        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/AppTheme">
        <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>