Android setOnEditorActionListener方法语法混乱

在其中一个网站学习android时，我遇到了以下程序：

public class MainActivity extends Activity {

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

ActionBar actionBar = getActionBar();
// add the custom view to the action bar
actionBar.setCustomView(R.layout.actionbar_view);
EditText search = (EditText) actionBar.getCustomView().findViewById(R.id.searchfield);
search.setOnEditorActionListener(new OnEditorActionListener() {

  @Override
  public boolean onEditorAction(TextView v, int actionId,
      KeyEvent event) {
    Toast.makeText(MainActivity.this, "Search triggered",
        Toast.LENGTH_LONG).show();
    return false;
  }
});
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM
    | ActionBar.DISPLAY_SHOW_HOME);
}

} 

这里一个监听器附加到EditText的自定义视图，它基本上是一个搜索项。有人能解释一下下列句子的语法吗

  setOnEditorActionListener(new OnEditorActionListener() {

  @Override
  public boolean onEditorAction(TextView v, int actionId,
      KeyEvent event) {
    Toast.makeText(MainActivity.this, "Search triggered",
        Toast.LENGTH_LONG).show();
    return false;
  }
})

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据我所知，函数“setOnEditorActionListener”的参数中有函数的定义。有人能帮我理解正确或错误吗？

使用addTextChangedListener代替setOnEditorActionListener

 search.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

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学习Java。提示：这是接口实现。看看这是怎么回答这个问题的？