25

我找到了一种解决方法来实际启用嵌套 PreferenceScreen 上的 ActionBar 主页按钮......但是它不会在我的 PreferenceActivity 中调用 OnOptionsItemSelected。有人知道在嵌套的 PreferenceScreen 上实际使用主页按钮的方法吗?

此处修改后35:

http://code.google.com/p/android/issues/detail?id=4611

@Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference)
    {
        super.onPreferenceTreeClick(preferenceScreen, preference);
        if (preference!=null)
            if (preference instanceof PreferenceScreen)
                if (((PreferenceScreen)preference).getDialog()!=null)
                    ((PreferenceScreen)preference).getDialog().getActionBar().setHomeButtonEnabled(true);
        return false;
    }
4

1 回答 1

46

我最近遇到了这个问题,这就是我解决它的方法。首先要访问 PreferenceScreen,我使用您上面提到的完全相同的方法。

@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
    super.onPreferenceTreeClick(preferenceScreen, preference);

    // If the user has clicked on a preference screen, set up the action bar
    if (preference instanceof PreferenceScreen) {
        initializeActionBar((PreferenceScreen) preference);
    }

    return false;
}

从这里我研究了PreferenceScreen是什么,我很伤心地发现它只是一个对话框的包装。继续前进,然后我设置操作栏显示选项并尝试找到主页按钮区域。不幸的是,这不太容易获得,但在层次结构查看器的帮助下,我设法通过找到主页图标然后找到它的父视图来获得访问权限。一旦我们可以访问包含的 LinearLayout,我们就可以附加一个 onClickListener 来关闭 PreferenceScreen 的对话框,该对话框调用PreferenceScreen 的 onDismissListener并将我们返回到上一个屏幕。

/** Sets up the action bar for an {@link PreferenceScreen} */
public static void initializeActionBar(PreferenceScreen preferenceScreen) {
    final Dialog dialog = preferenceScreen.getDialog();

    if (dialog != null) {
        // Inialize the action bar
        dialog.getActionBar().setDisplayHomeAsUpEnabled(true);

        // Apply custom home button area click listener to close the PreferenceScreen because PreferenceScreens are dialogs which swallow
        // events instead of passing to the activity
        // Related Issue: https://code.google.com/p/android/issues/detail?id=4611
        View homeBtn = dialog.findViewById(android.R.id.home);

        if (homeBtn != null) {
            OnClickListener dismissDialogClickListener = new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            };

            // Prepare yourselves for some hacky programming
            ViewParent homeBtnContainer = homeBtn.getParent();

            // The home button is an ImageView inside a FrameLayout
            if (homeBtnContainer instanceof FrameLayout) {
                ViewGroup containerParent = (ViewGroup) homeBtnContainer.getParent();

                if (containerParent instanceof LinearLayout) {
                    // This view also contains the title text, set the whole view as clickable
                    ((LinearLayout) containerParent).setOnClickListener(dismissDialogClickListener);
                } else {
                    // Just set it on the home button
                    ((FrameLayout) homeBtnContainer).setOnClickListener(dismissDialogClickListener);
                }
            } else {
                // The 'If all else fails' default case
                homeBtn.setOnClickListener(dismissDialogClickListener);
            }
        }    
    }
}
于 2013-05-28T20:05:17.510 回答