MainActivity.java

package com.example.broadcasttest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private IntentFilter intentFilter;

    private LocalReceiver localReceiver;

    private LocalBroadcastManager localBroadcastManager;

//    private IntentFilter intentFilter;
//
//    private NetworkChangeReceiver networkChangeReceiver;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        intentFilter = new IntentFilter();
//        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
//        networkChangeReceiver = new NetworkChangeReceiver();
//        registerReceiver(networkChangeReceiver, intentFilter);
        localBroadcastManager = LocalBroadcastManager.getInstance(this); // 获取实例
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent("com.example.broadcasttest.LOCAL_BROADCAST");
                //如果要在android8上边发送静态广播，需加入Component参数（参数1是自定义广播的包名，参数2是自定义广播的路径）
                intent.setComponent(new ComponentName("com.example.broadcasttest",
                        "com.example.broadcasttest.MyBroadcastReceiver"));
                localBroadcastManager.sendBroadcast(intent); // 发送本地广播
            }
        });
        intentFilter = new IntentFilter();
        intentFilter.addAction("com.example.broadcasttest.LOCAL_BROADCAST");
        localReceiver = new LocalReceiver();
        localBroadcastManager.registerReceiver(localReceiver, intentFilter); // 注册本地广播监听器
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
//        unregisterReceiver(networkChangeReceiver);
        localBroadcastManager.unregisterReceiver(localReceiver);
    }

    class LocalReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "received local broadcast", Toast.LENGTH_SHORT).show();
        }

    }

//    class NetworkChangeReceiver extends BroadcastReceiver {
//
//        @Override
//        public void onReceive(Context context, Intent intent) {
//            ConnectivityManager connectionManager = (ConnectivityManager)
//                    getSystemService(Context.CONNECTIVITY_SERVICE);
//            NetworkInfo networkInfo = connectionManager.getActiveNetworkInfo();
//            if (networkInfo != null && networkInfo.isAvailable()) {
//                Toast.makeText(context, "network is available",
//                        Toast.LENGTH_SHORT).show();
//            } else {
//                Toast.makeText(context, "network is unavailable",
//                        Toast.LENGTH_SHORT).show();
//            }
//
//        }
//
//    }

}