인터넷 연결상태 확인하기

0. 출처

https://www.edwith.org/boostcourse-android/lecture/20491/

1. 실행 결과 확인

     

    

2. activity_main.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"
    android:gravity="center_horizontal"
    tools:context="com.tistory.qlyh8.practice.MainActivity">
 
    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="대기중"
        android:textSize="30sp"/>
    <Button
        android:id="@+id/button"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="네트워크 확인"/>
 
</LinearLayout>
 

3. AndroidManifext.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tistory.qlyh8.practice">
 
    <uses-permission android:name="android.permission.ACCESS_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>

4. NetworkStatus.java

package com.tistory.qlyh8.practice;
 
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
 
public class NetworkStatus {
    public static final int TYPE_WIFI = 1;
    public static final int TYPE_MOBILE = 2;
    public static final int TYPE_NOT_CONNECTED = 3;
 
    public static int getConnectivityStatus(Context context){
        // ConnectivityManager 시스템 서비스 객체를 사용하여 인터넷 연결 상태 확인
        ConnectivityManager manager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
 
        // 네트워크 정보 가져오기
        NetworkInfo networkInfo = null;
        if (manager != null) {networkInfo = manager.getActiveNetworkInfo();}
 
        if (networkInfo != null) {
            int type = networkInfo.getType();
            if (type == ConnectivityManager.TYPE_MOBILE) {  // 3G, LTE 로 연결된 상태
                return TYPE_MOBILE;
            } else if (type == ConnectivityManager.TYPE_WIFI) { // 와이파이로 연결된 상태
                return TYPE_WIFI;
            }
        }
 
        return TYPE_NOT_CONNECTED;  // 인터넷이 연결되지 않음
    }
}
 

5. MainActivity.java

package com.tistory.qlyh8.practice;
 
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
    TextView textView;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        textView = findViewById(R.id.text_view);
 
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int status = NetworkStatus.getConnectivityStatus(getApplicationContext());
                if(status == NetworkStatus.TYPE_MOBILE)
                    textView.setText("모바일로 연결됨\n");
                else if(status == NetworkStatus.TYPE_WIFI)
                    textView.setText("와이파이로 연결됨\n");
                else
                    textView.setText("연결되지 않음\n");
            }
        });
    }
}

6. 참고

- 연결 상태 확인 및 모니터링

https://developer.android.com/training/monitoring-device-state/connectivity-monitoring?hl=ko