问题描述

我想做与 Honeycomb 平板电脑上的 GMail 应用程序相同的事情.当您单击 Refresh 按钮时，图标将替换为 ProgressBar.我该怎么做?

I would like to do the same thing than the GMail application on Honeycomb tablets. When you click on the Refresh button, the icon is replaced by a ProgressBar. How can I do this?

谢谢

推荐答案

好的，我尝试了 Cailean 的建议，但对我没有用.每次我想将不确定的进度恢复为原始按钮时，它变得不可点击，我使用这个布局来进行进度

Ok, I tried what Cailean suggested but it didn't work for me. Every time I want to revert indeterminate progress to the original button it becomes unclickable, I used this layout for the progress

(actionbar_refresh_progress.xml)

(actionbar_refresh_progress.xml)

<?xml version="1.0" encoding="utf-8"?>
<ProgressBar xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="32dp"
             android:layout_height="32dp"
             android:layout_gravity="center"/>

这个要恢复到按钮

(actionbar_refresh_button.xml)

(actionbar_refresh_button.xml)

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
           android:src="@drawable/ic_menu_refresh_holo_light"
           android:layout_height="wrap_content"
           android:layout_width="wrap_content"/>

我的代码是:

private void setRefreshing(boolean refreshing) {
        this.refreshing = refreshing;
        if(refreshMenuItem == null) return;
        View refreshView;
        LayoutInflater inflater = (LayoutInflater)getActionBar().getThemedContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if(refreshing)
            refreshView = inflater.inflate(R.layout.actionbar_refresh_progress, null);
        else
            refreshView = inflater.inflate(R.layout.actionbar_refresh_button, null);

        refreshMenuItem.setActionView(refreshView);
    }

浏览了谷歌IO应用的源码后，尤其是这个文件:http://code.google.com/p/iosched/source/browse/android/src/com/google/android/apps/iosched/ui/HomeActivity.java 我找到了另一种更简单的方法.

After browsing the source of the Google IO app, especially this file: http://code.google.com/p/iosched/source/browse/android/src/com/google/android/apps/iosched/ui/HomeActivity.java i found another easier way.

现在我只需要第一个有进度的布局，工作方法如下:

Now I need only the first layout with progress and the working method looks like this:

private void setRefreshing(boolean refreshing) {
    this.refreshing = refreshing;
    if(refreshMenuItem == null) return;

    if(refreshing)
        refreshMenuItem.setActionView(R.layout.actionbar_refresh_progress);
    else
        refreshMenuItem.setActionView(null);
}

菜单项定义:

<item android:id="@+id/mail_refresh"
      android:title="Refresh"
      android:icon="@drawable/ic_menu_refresh_holo_light"
      android:showAsAction="always"/>

我希望有人觉得这很有用.

I hope someone finds this useful.

这篇关于ActionBar 中的 ProgressBar，例如带有 Refresh 的 GMail 应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！