I have created register activity which sends data to database, and the button has to open another activity, which is MainActivity. The code works fine, but theres one problem. When the button is being clicked, it responds and sends the information to database, but the activity isn't changing. 

How could I change the code to open another activity?

RegisterRequest.java

```
public class RegisterRequest extends StringRequest {

private static final String REGISTER_REQUEST_URL = "http://loginacti.comli.com/Register.php";
private Map<String, String> params;

public RegisterRequest(String Expect, String Prize, String Name, String Email, Response.Listener<String> listener) {
        super(Method.POST, REGISTER_REQUEST_URL, listener, null);
    params = new HashMap<>();
    params.put("Expect", Expect);
    params.put("Prize", Prize);
    params.put("Name", Name);
    params.put("Email", Email);

}

@Override
public Map<String, String> getParams() {
    return params;
}

```

RegisterActivity.java

```
public class RegisterActivity extends AppCompatActivity {

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

    final EditText etUknown = (EditText) findViewById(R.id.etUknown);
    final EditText etPrize = (EditText) findViewById(R.id.etPrize);
    final EditText etName = (EditText) findViewById(R.id.etName);
    final EditText etEmail = (EditText) findViewById(R.id.etEmail);
    final Button bRegister = (Button) findViewById(R.id.bRegister);

    bRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final String Expect = etUknown.getText().toString();
            final String Prize = etPrize.getText().toString();
            final String Name = etName.getText().toString();
            final String Email = etEmail.getText().toString();

            Response.Listener<String> responseListener = new Response.Listener<String>(){

                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);
                        boolean success = jsonResponse.getBoolean("success");
                        if (success){
                            Intent intent = new Intent(RegisterActivity.this, MainActivity.class);
                            RegisterActivity.this.startActivity(intent);
                        }else{
                            AlertDialog.Builder builder = new AlertDialog.Builder(RegisterActivity.this);
                            builder.setMessage("Register Failed")
                                    .setNegativeButton("Retry", null)
                                    .create()
                                    .show();

                        }

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            };

            RegisterRequest registerRequest = new RegisterRequest(Expect, Prize, Name, Email, responseListener);
            RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
            queue.add(registerRequest);
        }
    });
}

```

MainActivity.java

```
public class MainActivity extends AppCompatActivity {

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

    final TextView registerLink = (TextView) findViewById(R.id.eRegister);

    registerLink.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent registerIntent = new Intent(MainActivity.this, RegisterActivity.class);
            MainActivity.this.startActivity(registerIntent);
        }
    });
}

```

Manifest

```
<uses-permission android:name="android.permission.INTERNET"></uses-permission>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    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>
    <activity android:name=".RegisterActivity"></activity>
</application>

```

activity\_register.xml

```
    <EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/etUknown"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="60dp"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:hint="Numbers" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/etPrize"
    android:hint="Secret CD"
    android:layout_below="@+id/etUknown"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@+id/etUknown"
    android:layout_alignEnd="@+id/etUknown" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="textPersonName"
    android:ems="10"
    android:id="@+id/etName"
    android:hint="Full Name"
    android:layout_below="@+id/etPrize"
    android:layout_alignRight="@+id/etPrize"
    android:layout_alignEnd="@+id/etPrize"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="textEmailAddress"
    android:ems="10"
    android:id="@+id/etEmail"
    android:hint="New Email"
    android:layout_below="@+id/etName"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@+id/etName"
    android:layout_alignEnd="@+id/etName" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Register"
    android:id="@+id/bRegister"
    android:layout_marginTop="46dp"
    android:layout_below="@+id/etEmail"
    android:layout_centerHorizontal="true" />

```