How to show Indeterminate Progress bar when Refresh button is pressed in ActionBarSherlock?

问题

How to show Indeterminate ProgressBar when Refresh button is pressed in ActionBarSherlock and again show Refresh Button when ViewGroup on refreshed?

Update 1: I have a answer here which is incomplete. I am placing a bounty on question so that more developers can help build a good answer which can useful to others in future.

How can we show a Indeterminate ProgressBar which looks like the one shown in the image below

回答1:

It seems like ActionBarSherlock doesn't provide specific method to animate a refresh MenuItem.

What you can do (by using classic android API) is to use the setActionView(int resId) method and give the id of a layout with a ProgressBar in it.

At the beginning of your refresh action just call :

item.setActionView(R.layout.refresh_menuitem);

And when your refresh action is finished call :

item.setActionView(null);

Here is a sample of what your layout file refresh_menuitem.xml can have :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:addStatesFromChildren="true"
              android:focusable="true"
              android:paddingLeft="4dp"
              android:paddingRight="4dp"
              android:gravity="center"
              style="?attr/actionButtonStyle">
    <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:focusable="true"
            style="@android:style/Widget.ProgressBar.Small"/>
</LinearLayout>

回答2:

Here is how you add this kind of indeterminate ProgressBar with a ActionBarSherlock object : (actually it's easier the other one but the progressBar is shown alone and not above a MenuItem)

1 - Put this line in the onCreate() method before the setContentView() call :

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

-> This line specify that you will use the indeterminate ProgressBar function.

2 - Enable the indeterminate ProgressBar by calling :

setSupportProgressBarIndeterminateVisibility(true);

3 - Disable the indeterminate ProgressBar by calling :

setSupportProgressBarIndeterminateVisibility(false);

Remark : Have a look in the sample folder of the ActionBarSherlock folder. I found this code in the following file : JakeWharton-ActionBarSherlock-9598f2b\samples\demos\src\com\actionbarsherlock\sample\demos\IndeterminateProgress.java

回答3:

Here is a complete code:

private static final int menuItemIdRefresh = 10; //class constant
private boolean refresh;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuItem refreshItem = menu.add(0, menuItemIdRefresh, 0,
            getString(R.string.action_refresh)).setShowAsActionFlags(
            MenuItem.SHOW_AS_ACTION_ALWAYS);

    if (isRefreshing) {
        refreshItem.setActionView(R.layout.indeterminate_progress);
    } else {
        refreshItem.setActionView(null);
        refreshItem.setIcon(R.drawable.ic_refresh);
    }

    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case menuItemIdRefresh: {
            //the user has pressed the refresh button
        if (!isRefreshing) {
            isRefreshing = true;
            new RefreshMyViewAsyncTask().execute("");
        }
    }
        break;

    default:
        break;
    }

    return false;
}

One last note, in order to get the above code working you´ll need also call supportInvalidateOptionsMenu(). You can add that to the RefreshMyViewAsyncTask's onPreExecute() method.

Hope this helps to somebody.

来源：https://stackoverflow.com/questions/10905053/how-to-show-indeterminate-progress-bar-when-refresh-button-is-pressed-in-actionb

标签

android

actionbarsherlock