Question

我尝试使用上方的工具栏为我的应用创建设置窗口，然后输入后退按钮等。但我总是这个错误。

错误渲染期间引发异常：android.support.design.widget.AppBarLayout无法强制转换为android.preference.Preference

preferenze.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>

的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>

Answer 1

我也有这个问题并花了一些时间来解决它。步骤进行：

- 使用要设置活动的AppCompatPreferenceActivity进行扩展。从here获取此类，并将其作为java类放入项目中。

- 参考片段：

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（首选项屏幕）中，创建一个PreferenceCategory并将其置于最顶层，作为布局的第一个元素，并将工具栏作为布局添加到该布局中：

<?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”中填充工具栏，这里是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();
    }
}

渲染期间引发异常：android.support.design.widget.AppBarLayout无法强制转换为android.preference.Preference

1 个答案: