public class AboutActivity extends AppCompatActivity
{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.me_fragment_about);
//将应用程序图标设置为可点击的按钮 并添加向左的箭头
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
//修改活动条的标题
getSupportActionBar()..setTitle("修改菜品分类");
}
//实现点击箭头可以返回上一级的功能 @Override public boolean onSupportNavigateUp() { finish(); return super.onSupportNavigateUp(); }
}