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public class MyBRReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "Network status has changed~", Toast.LENGTH_SHORT).show();
    }
}

public class MainActivity extends AppCompatActivity {

    MyBRReceiver myReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Core part of the code:
        myReceiver = new MyBRReceiver();
        IntentFilter itFilter = new IntentFilter();
        itFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(myReceiver, itFilter);
    }

    // Don't forget to cancel the broadcast~
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myReceiver);
    }
}

public class BootCompleteReceiver extends BroadcastReceiver {
    private final String ACTION_BOOT = "android.intent.action.BOOT_COMPLETED";
    @Override
    public void onReceive(Context context, Intent intent) {
        if (ACTION_BOOT.equals(intent.getAction()))
            Toast.makeText(context, "Boot completed~", Toast.LENGTH_LONG).show();
    }
}