接收广播系统

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.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";

    private IntentFilter  intentFilter;

    private NetworkChangeReceive networkChangeReceive;

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

        intentFilter = new IntentFilter();
        intentFilter.addAction("网络改变");
        networkChangeReceive = new NetworkChangeReceive();
        registerReceiver(networkChangeReceive,intentFilter);

        Toast.makeText(this.getBaseContext(),"开始了啊",
                Toast.LENGTH_SHORT
        ).show();

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(networkChangeReceive);
    }


    class  NetworkChangeReceive extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager connectivityManager
                    = (ConnectivityManager) getSystemService(context.CONNECTIVITY_SERVICE);

            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            if(networkInfo != null && networkInfo.isAvailable()){
                Toast.makeText(context,"network is 可用",
                        Toast.LENGTH_SHORT
                ).show();
                Log.d(TAG, "onReceive:可用 ");
            }else {

                Toast.makeText(context,"network is 不能用",
                        Toast.LENGTH_SHORT
                ).show();

                Log.d(TAG, "onReceive:不能用 ");

            }
        }


            }




}

package com.example.broadcasttest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class BootCompleteReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //        throw new UnsupportedOperationException("Not yet implemented");
        Toast.makeText(context,"Boot 完成 ",Toast.LENGTH_LONG).show();
    }
}

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

    <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>

        <receiver
            android:name=".BootCompleteReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>

                <action android:name="android.intent.action.BOOT_COMPLETED"/>

            </intent-filter>

        </receiver>
    </application>

</manifest>