Androidのシンプルなネットバリエーションリスナー

ブロードキャストは、動的ブロードキャストと静的ブロードキャストに分けられます.この例では、動的ブロードキャストです.

package com.yoostar.summary.utils;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;

/**
 * ================================================
 *       ：zhoujianan
 *       ：v1.0
 *     ：2019/8/28
 *       :
 *     ：
 * ================================================
 */
public class NetworkReceiver extends BroadcastReceiver {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            //       
            if (networkInfo != null && networkInfo.isAvailable()) {
                int type = networkInfo.getType();
                switch (type) {
                    case ConnectivityManager.TYPE_MOBILE:
                        Toast.makeText(context, "        ", Toast.LENGTH_SHORT).show();
                        break;
                    case ConnectivityManager.TYPE_WIFI:
                        Toast.makeText(context, "  WIFI    ", Toast.LENGTH_SHORT).show();
                        break;
                    case ConnectivityManager.TYPE_ETHERNET:
                        Toast.makeText(context, "         ", Toast.LENGTH_SHORT).show();
                        break;
                }
            } else {
                //        
                Toast.makeText(context, "      ", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

package com.yoostar.summary.http.activity;

import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import com.yoostar.summary.R;
import com.yoostar.summary.utils.Logger;
import com.yoostar.summary.utils.NetworkReceiver;

/**
 * ================================================
 *       ：zhoujianan
 *       ：v1.0
 *     ：2019/8/28
 *       :
 *     ：
 * ================================================
 */
public class NetworkActivity extends AppCompatActivity {
    private TextView networkTv;
    private NetworkReceiver mNetReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_network);
        initView();
        initNetworkReceiver();
    }

    private void initNetworkReceiver() {
        mNetReceiver = new NetworkReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(mNetReceiver, filter);
    }

    private void initView() {
        TextView textView = findViewById(R.id.network_tv);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Logger.i(Logger._TJ, "onDestroy");
        unregisterReceiver(mNetReceiver);
    }
}

Manifest.xmlで追加する必要があるネットワーク権限

	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>