呈现期间引发的异常

呈现期间引发的异常

我正在尝试使用上面的工具栏为我的应用创建一个设置窗口,以输入“后退”按钮等。但是我总是这个错误。

错误
呈现期间引发的异常:android.support.design.widget.AppBarLayout无法强制转换为android.preference.Preference

preferredenze.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <PreferenceCategory>
        <ListPreference android:key="colore"
            android:summary="ciao"
            android:title="About "
            android:defaultValue="#000000"
            android:dialogTitle="colore di sfondo" />
    </PreferenceCategory>
</PreferenceScreen>


settings.xml



<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_height="wrap_content"
    android:layout_width="match_parent">

    <android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:toolbarId="@+id/toolbar"
        app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
        app:contentScrim="?attr/colorPrimary">

        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:theme="?attr/actionBarTheme"
            android:minHeight="?attr/actionBarSize"
            android:id="@+id/toolbar" />

    </android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
    <RelativeLayout
            android:id="@+id/activity_tips"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            tools:context="com.example.twisterandroid.Tips_5">

            <LinearLayout
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_alignParentTop="true"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:weightSum="1">

                <include layout="@xml/preferenze"/>

            </LinearLayout>
        </RelativeLayout>


</android.support.design.widget.CoordinatorLayout>

最佳答案

我也有这个问题,花了我一些时间来解决。
脚步:

-使用AppCompatPreferenceActivity进行“设置”活动来扩展。
here获取此类并将其作为Java类放入您的项目中。

-首选项片段:

public class SettingsFragment extends PreferenceFragment {
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings_fragment);
    }
}


-在“首选项/设置片段”布局中(“偏好设置”屏幕),创建一个PreferenceCategory并将其放在最顶层,作为布局的第一个元素,并在其中插入工具栏作为布局:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory android:layout="@layout/settings_toolbar" />
    <!--<rest of the elements below it here>-->
</PreferenceScreen>


-创建settings_toolbar布局文件:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>


-最终在“设置活动”中为工具栏充气,这是Settings/PreferencesActivity的代码:

public class SettingsActivity extends AppCompatPreferenceActivity {

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

        getLayoutInflater().inflate(R.layout.settings_toolbar, (ViewGroup) findViewById(android.R.id.content));
        Toolbar toolbar = findViewById(R.id.toolbar);
        toolbar.setTitle("Settings or Preferences, etc ... ");
        setSupportActionBar(toolbar);


        SettingsFragment settingsFragmnet= new SettingsFragment();
        getFragmentManager().beginTransaction().replace(android.R.id.content, settingsFragmnet).commit();
    }
}

07-24 19:43