android listener instance code

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import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button1=(Button)findViewById(R.id.button1);

    button1.setOnClickListener(new View.OnClickListener()
    {@Override
    public void onClick(View v)
    {
      Intent intent=new Intent(MainActivity.this,Main2Activity.class);
      startActivity(intent);
    }});

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Pay attention to the case. Be careful not to duplicate names. Try to follow the actual meaning of the name

In the process of Android application development, the common listening events are as follows:

(1) ListView Event Monitoring
setOn ItemSelectedListener: Triggered when the mouse scrolls
setOnItemClickListener: Triggered when clicked

(2) EditText Event Monitoring
setOnKeyListener: Triggered when focus is acquired

(3) RadioGroup Event Monitoring
setOnCheckedChangeListener: Triggered when clicked

(4) CheckBox Event Monitoring
setOnCheckedChangeListener: Triggered when clicked

(5) Spinner Event Monitoring
setOnltemSelectedListener: Triggered when clicked

(6) DatePicker Event Monitoring

onDateChangedListener: Triggered when the date changes

(7) DatePickerDialog Event Monitoring
onDateSetListener: Triggered when a date is set

(8) TimePicker Event Monitoring
onTimeChangedListener: Triggered when time changes

(9) TimePickerDialog Event Monitoring
onTimeSetListener: Triggered when time is set

(10) Button. ImageButton Event Monitoring
setOnClickListener: Triggered when clicked

(11) Menu Event Monitoring
onOptionsltemSelected; Triggered when clicked

(12) Gallery Event Monitoring
setOnItemClickListener: Triggered when clicked

(13) GridView Event Monitoring
setOnltemClickListener: Triggered when clicked

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