onFocusChange事件未按预期工作

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private EditText editText;

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

        editText = findViewById(R.id.editText);
        editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (hasFocus) {
                    Toast.makeText(MainActivity.this, "获得焦点", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "失去焦点", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}