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public class MainActivity extends AppCompatActivity {
 
    EditText e1;
    Button b1;
    String s;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        e1 = (EditText)findViewById(R.id.count_id);
        e1.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "999999999")});
        b1 = (Button)findViewById(R.id.send_button);
        int length = e1.getText().length();
		b1.setEnabled(length > 6 && length < 9);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                s = e1.getText().toString();
                String url = "***";
                StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                        new Response.Listener<String>() {
                            @Override
                            public void onResponse(String response) {
                                Toast.makeText(getApplicationContext(), "Операция совершена успешно", Toast.LENGTH_LONG).show();
                            }
                        },
                        new Response.ErrorListener() {
                            @Override
                            public void onErrorResponse(VolleyError error) {
                                Toast.makeText(getApplicationContext(), "Во время активации произошла ошибка", Toast.LENGTH_LONG).show();
                            }
                        }){
                    @Override
                    protected Map<String, String> getParams() {
                        Map<String,String> params = new HashMap<String, String>();
                        params.put("count_id",s);
 
                        return params;
                    }
                };
                RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
                requestQueue.add(stringRequest);
 
            }
        });
 
        ConstraintLayout constraintLayout = findViewById(R.id.layout);
        AnimationDrawable animationDrawable = (AnimationDrawable) constraintLayout.getBackground();
        animationDrawable.setEnterFadeDuration(2000);
        animationDrawable.setExitFadeDuration(4000);
        animationDrawable.start();
 
    }
}

Main.java:1: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
Main.java:1: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
Main.java:3: error: cannot find symbol
    EditText e1;
    ^
  symbol:   class EditText
  location: class MainActivity
Main.java:4: error: cannot find symbol
    Button b1;
    ^
  symbol:   class Button
  location: class MainActivity
Main.java:8: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:7: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:9: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:10: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
Main.java:12: error: cannot find symbol
        e1 = (EditText)findViewById(R.id.count_id);
              ^
  symbol:   class EditText
  location: class MainActivity
Main.java:12: error: package R does not exist
        e1 = (EditText)findViewById(R.id.count_id);
                                     ^
Main.java:13: error: cannot find symbol
        e1.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "999999999")});
                          ^
  symbol:   class InputFilter
  location: class MainActivity
Main.java:13: error: cannot find symbol
        e1.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "999999999")});
                                             ^
  symbol:   class InputFilterMinMax
  location: class MainActivity
Main.java:14: error: cannot find symbol
        b1 = (Button)findViewById(R.id.send_button);
              ^
  symbol:   class Button
  location: class MainActivity
Main.java:14: error: package R does not exist
        b1 = (Button)findViewById(R.id.send_button);
                                   ^
Main.java:17: error: package View does not exist
        b1.setOnClickListener(new View.OnClickListener() {
                                      ^
Main.java:19: error: cannot find symbol
            public void onClick(View v) {
                                ^
  symbol: class View
Main.java:18: error: method does not override or implement a method from a supertype
            @Override
            ^
Main.java:22: error: cannot find symbol
                StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                ^
  symbol: class StringRequest
Main.java:22: error: cannot find symbol
                StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                                                  ^
  symbol: class StringRequest
Main.java:22: error: package Request does not exist
                StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                                                                       ^
Main.java:23: error: package Response does not exist
                        new Response.Listener<String>() {
                                    ^
Main.java:24: error: method does not override or implement a method from a supertype
                            @Override
                            ^
Main.java:26: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "???????? ????????? ???????", Toast.LENGTH_LONG).show();
                                                                                                      ^
  symbol: variable Toast
Main.java:26: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "???????? ????????? ???????", Toast.LENGTH_LONG).show();
                                ^
  symbol: variable Toast
Main.java:26: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "???????? ????????? ???????", Toast.LENGTH_LONG).show();
                                               ^
  symbol: method getApplicationContext()
Main.java:29: error: package Response does not exist
                        new Response.ErrorListener() {
                                    ^
Main.java:31: error: cannot find symbol
                            public void onErrorResponse(VolleyError error) {
                                                        ^
  symbol: class VolleyError
Main.java:30: error: method does not override or implement a method from a supertype
                            @Override
                            ^
Main.java:32: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "?? ????? ????????? ????????? ??????", Toast.LENGTH_LONG).show();
                                                                                                               ^
  symbol: variable Toast
Main.java:32: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "?? ????? ????????? ????????? ??????", Toast.LENGTH_LONG).show();
                                ^
  symbol: variable Toast
Main.java:32: error: cannot find symbol
                                Toast.makeText(getApplicationContext(), "?? ????? ????????? ????????? ??????", Toast.LENGTH_LONG).show();
                                               ^
  symbol: method getApplicationContext()
Main.java:36: error: cannot find symbol
                    protected Map<String, String> getParams() {
                              ^
  symbol: class Map
Main.java:35: error: method does not override or implement a method from a supertype
                    @Override
                    ^
Main.java:37: error: cannot find symbol
                        Map<String,String> params = new HashMap<String, String>();
                        ^
  symbol: class Map
Main.java:37: error: cannot find symbol
                        Map<String,String> params = new HashMap<String, String>();
                                                        ^
  symbol: class HashMap
Main.java:43: error: cannot find symbol
                RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
                ^
  symbol: class RequestQueue
Main.java:43: error: cannot find symbol
                RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
                                            ^
  symbol: variable Volley
Main.java:49: error: cannot find symbol
        ConstraintLayout constraintLayout = findViewById(R.id.layout);
        ^
  symbol:   class ConstraintLayout
  location: class MainActivity
Main.java:49: error: package R does not exist
        ConstraintLayout constraintLayout = findViewById(R.id.layout);
                                                          ^
Main.java:50: error: cannot find symbol
        AnimationDrawable animationDrawable = (AnimationDrawable) constraintLayout.getBackground();
        ^
  symbol:   class AnimationDrawable
  location: class MainActivity
Main.java:50: error: cannot find symbol
        AnimationDrawable animationDrawable = (AnimationDrawable) constraintLayout.getBackground();
                                               ^
  symbol:   class AnimationDrawable
  location: class MainActivity
41 errors

Standard output is empty