Change Layout on setContentView according to my Internet Connection Status

Question

I'm currently working on a App, where I want to add a feature. When there is no internet the layout of the activity must change vise-versa. I'm kinda not so good in android and I used this code for my little idea. Any idea how to achieve this. When I try the App crashes.

public class RescuingActivity extends AppCompatActivity {

private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if(ConnectivityStatus.isConnected(getContext())){
            setContentView(R.layout.rescue_page);
        }else {
            setContentView(R.layout.no_connection);
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getContext().registerReceiver(receiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
 }
}

Logcat error:

xxx/E/AndroidRuntime: FATAL EXCEPTION: main Process: xxx, PID: 6258 java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx.xxx.xxxxxxx/xxx.xxx.xxxxxxx.view.RescuingActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2221) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2280) at android.app.ActivityThread.access$800(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5059) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.kit.arescue.view.RescuingActivity.onCreate(RescuingActivity.java:90)

Answer 1

Found the answer, tried working with 2 views.

 private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if(!ConnectivityStatus.isConnected(getContext())){
            childLayoutRescuingActivity.setVisibility(INVISIBLE);
            childLayoutNoConnection.setVisibility(View.VISIBLE);
        }else {
            childLayoutRescuingActivity.setVisibility(View.VISIBLE);
            childLayoutNoConnection.setVisibility(INVISIBLE);
        }
    }
};