在 ActionBar 上显示进度微调器（刷新）？

Question

我正在使用操作栏。我想在标题栏上有一个刷新进度微调器，如果我将它设置为旋转 - 否则隐藏它。这可能吗？：

// My menu has a refresh item, but it shouldn't be visible on the
// actionbar unless it's spinning.
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/menu_refresh"
    android:title="@string/refresh"
    android:icon="@drawable/ic_action_refresh" />
</menu>

...

// When I need to show some work being done on my activity,
// can I somehow now make the spinner associated with the
// refresh item become visible on the action bar?
getActionBarHelper().setRefreshActionItemState(true);

我不希望它出现在 ActionBar 上，除非它“正在进行”/正在旋转。

谢谢

Answer 1

抱歉没有代码标签，从手机发帖...

这是来自 ActionbarSherlock（如果您没有遇到过，Google 允许在 prehoneycomb 中支持操作栏）

在主Activity的onCreate中

// This has to be called before setContentView and you must use the 
// class in android.support.v4.view and NOT android.view

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

在操作栏中显示/隐藏进度。注意，actionbarsherlock 必须使用 boolean.TRUE/FALSE，而不仅仅是 true/false......

if (getSupportLoaderManager().hasRunningLoaders()) {
   setProgressBarIndeterminateVisibility(Boolean.TRUE); 
} else {
   setProgressBarIndeterminateVisibility(Boolean.FALSE); 
}

Answer 2

如果你从 ActionBarActivity 扩展，试试这个：

public class MainActivity extends ActionBarActivity {

    boolean showUp=true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);
        setSupportProgressBarIndeterminateVisibility(Boolean.TRUE);

        Button b = (Button) findViewById(R.id.myButton);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if(showUp){
                    setSupportProgressBarIndeterminateVisibility(Boolean.FALSE);
                }else {
                    setSupportProgressBarIndeterminateVisibility(Boolean.TRUE);
                }
                showUp=!showUp;
            }
        });
}