Error(s), warning(s):

source_file.java:11: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
source_file.java:3: error: package android.content does not exist
import android.content.Context;
                      ^
source_file.java:4: error: package android.net does not exist
import android.net.ConnectivityManager;
                  ^
source_file.java:5: error: package android.net does not exist
import android.net.NetworkInfo;
                  ^
source_file.java:6: error: package android.os does not exist
import android.os.Bundle;
                 ^
source_file.java:7: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatActivity;
                             ^
source_file.java:8: error: package android.view does not exist
import android.view.View;
                   ^
source_file.java:9: error: package android.widget does not exist
import android.widget.TextView;
                     ^
source_file.java:11: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
source_file.java:13: error: cannot find symbol
    TextView txtStatus;
    ^
  symbol:   class TextView
  location: class MainActivity
source_file.java:14: error: cannot find symbol
    NetworkInfo wifiInfo;
    ^
  symbol:   class NetworkInfo
  location: class MainActivity
source_file.java:15: error: cannot find symbol
    NetworkInfo mobInfo;
    ^
  symbol:   class NetworkInfo
  location: class MainActivity
source_file.java:17: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
source_file.java:24: error: cannot find symbol
    public void getNetworkStatus(View v){
                                 ^
  symbol:   class View
  location: class MainActivity
source_file.java:16: error: method does not override or implement a method from a supertype
    @Override
    ^
source_file.java:18: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
source_file.java:19: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
source_file.java:21: error: cannot find symbol
        txtStatus = (TextView)findViewById(R.id.showstatus);
                     ^
  symbol:   class TextView
  location: class MainActivity
source_file.java:21: error: package R does not exist
        txtStatus = (TextView)findViewById(R.id.showstatus);
                                            ^
source_file.java:25: error: cannot find symbol
        ConnectivityManager conManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        ^
  symbol:   class ConnectivityManager
  location: class MainActivity
source_file.java:25: error: cannot find symbol
        ConnectivityManager conManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                                          ^
  symbol:   class ConnectivityManager
  location: class MainActivity
source_file.java:25: error: cannot find symbol
        ConnectivityManager conManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                                                                                ^
  symbol:   variable Context
  location: class MainActivity
source_file.java:26: error: cannot find symbol
        NetworkInfo[] networkInfo = conManager.getAllNetworkInfo();
        ^
  symbol:   class NetworkInfo
  location: class MainActivity
source_file.java:27: error: cannot find symbol
        for (NetworkInfo netInfo : networkInfo) {
             ^
  symbol:   class NetworkInfo
  location: class MainActivity