如何处理向上按钮（SDK版本11+）？我指的是一个在屏幕的顶部，将保存该应用程序图标

How to handle "Up" button (SDK version 11+)? I am referring to the one at the top of screen, that holds the application icon.

在Android的设计文章它被命名为向上按钮，但我没有发现它（或类似）的KeyEvent的领域。

In Android Design articles it was named as "Up button", but I didn't found it (or similar) in KeyEvent fields.

推荐答案

实施 onOptionsItemSelected（）并观看 android.R.id.home 菜单事件，如的文档。

Implement onOptionsItemSelected() and watch for android.R.id.home "menu" events, as is described in the documentation.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // do something useful
            return(true);
    }

    return(super.onOptionsItemSelected(item));
}