如何有动作条在preferenceActivity？ [英] How to have ActionBar in PreferenceActivity?

问题描述

我有一个Android应用程序一个 UserSettingsActivity 从 preferenceActivity 导出。当我打开这个活动，没有显示菜单栏。

I have an android app with a UserSettingsActivity derived from PreferenceActivity. When I open this activity, no menu bar is shown.

为了有酒吧或操作栏上的设置屏幕的上方，我搜索了它在谷歌上找到的此链接和<一个href=\"http://stackoverflow.com/questions/26509180/no-actionbar-in-$p$pferenceactivity-after-upgrade-to-support-library-v21\">this链接。因为第一次的答案似乎已经过时，我想建议在第二环节的的不工作的。因此，我再次发布了这个问题。这里是code的作品我使用：

In order to have the 'bar' or 'action bar' on top of the settings screen, I searched for it in google on found this link and this link. Because the first answer seems outdated, I tried the suggestion in the second link which does not work. Therefore I am posting this question again.. Here are the pieces of code I am using:

preferences.xml （我刚刚加入了 android.support.v7.widget.Toolbar 部分）：

preferences.xml ( I added just the android.support.v7.widget.Toolbar part):

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?attr/actionBarSize"
    app:navigationContentDescription="@string/abc_action_bar_up_description"
    android:background="?attr/colorPrimary"
    app:navigationIcon="?attr/homeAsUpIndicator"
    app:title="@string/action_settings"
    />

    <ListPreference
        android:title="@string/UpdateInterval"
        android:summary="@string/UpdateIntervalText"
        android:key="updateInterval"
        android:defaultValue="24"
        android:entries="@array/listArray"
        android:entryValues="@array/listValues" />

    <ListPreference
        android:title="@string/LimitSetting"
        android:summary="@string/LimitSettingText"
        android:key="limitSetting"
        android:entries="@array/limitArray"
        android:entryValues="@array/limitValues" />

    <Preference
        android:key="reset"
        android:title="Reset database"
        android:summary="This will remove every entry in the database"
         />
</PreferenceScreen>

和 UserSettingsActivity.java （我增加了 onPostCreate 部分）：

public class UserSettingActivity extends PreferenceActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();

    }

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

        LinearLayout root = (LinearLayout)findViewById(android.R.id.list).getParent().getParent().getParent();
        Toolbar bar = (Toolbar) LayoutInflater.from(this).inflate(R.xml.preferences, root, false);
        root.addView(bar, 0); // insert at top
        bar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }

    public class MyPreferenceFragment extends PreferenceFragment {
        @Override
        public void onCreate(final Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.preferences); // <<-- ERROR HERE
            // doing something here

        }
    }

}

不过，我得到以下错误：

However, I get the following error:

Caused by: java.lang.ClassCastException: android.support.v7.widget.Toolbar cannot be cast to android.preference.Preference

在标记线。如果没有这两个文件的附加件的应用程序没有工作，没有（动作）-bar，但是...

on the marked line. Without the added pieces in those two files the app did work, without the (action)-bar, however...

什么似乎是这里的问题？

What seems to be the problem here?

推荐答案

preferenceActivity现在是很precated。使用preferenceFragment任何其他活动，这可以从超过preferenceActivity

PreferenceActivity is now deprecated. Use PreferenceFragment inside any other activity, which can be extended from any parent activity other than PreferenceActivity

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