如何使用appcompat v21在独立工具栏上启用homeAsUp或调用setDisplayHomeAsUpEnabled()

Question

我正在尝试将我的应用程序转换为使用v21 AppCompat库,因此我开始使用工具栏而不是ActionBar.在我的所有常规活动(扩展ActionBarActivity)中,一切都很好.但在我的SettingsActivity中扩展了PreferenceActivity,因此我无法使用setSupportActionBar(actionbar)调用,我需要使用"独立"工具栏.工具栏显示,但我无法弄清楚如何将"home/up"按钮添加到工具栏.

SettingsActivity.java:

public class SettingsActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        Toolbar actionbar = (Toolbar) findViewById(R.id.actionbar);
        if (null != actionbar) {

            // In every other activity that extends ActionBarActivity I simply use:
            // setSupportActionBar(actionbar);
            // final ActionBar supportActionBar = getSupportActionBar();
            // supportActionBar.setDisplayHomeAsUpEnabled(true);

            // but in PreferenceActivity you need to add a standalone toolbar:    
            actionbar.setTitle(R.string.title_activity_settings);
            actionbar.setNavigationOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    SettingsActivity.this.finish();
                }
            });

            // Inflate a menu to be displayed in the toolbar
            actionbar.inflateMenu(R.menu.settings);
        }
    }
}

布局/ activity_settings.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              tools:context=".SettingsActivity"
              tools:menu="settings"
              tools:actionBarNavMode="standard"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <include
        layout="@layout/actionbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@android:id/list" />
</LinearLayout>

布局/ actionbar.xml:

<?xml version="1.0" encoding="utf-8"?>
<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/actionbar"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:minHeight="?attr/actionBarSize"
    android:background="?attr/colorPrimaryDark"
    app:theme="@style/AppTheme"
    />

菜单/ settings.xml中:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.fletech.android.redalert.SettingsActivity" >
</menu>

我尝试将actionBarStyle和displayOptions添加到我的主题,如Android嵌套PreferenceScreen上的Show up/back按钮中所述？,但在其他地方人们说当我使用工具栏时不会使用actionBarStyle,它们似乎是正确的.

值/的themes.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="AppTheme.Base"/>

    <style name="AppTheme.Base" parent="Theme.AppCompat">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimary</item>
        <item name="android:windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="windowActionModeOverlay">true</item>

        <!-- Set AppCompat’s actionBarStyle -->
        <item name="actionBarStyle">@style/MyActionBar</item>
    </style>

    <style name="MyActionBar" parent="Widget.AppCompat.ActionBar">
        <item name="displayOptions">showHome|homeAsUp|showTitle</item>
    </style>
<resources>

Answer 1

@Pedro Oliveira的解决方案奏效了.我甚至可以找到AppCompat库使用的drawable(因此已经包含在apk中).它还有镜像,所以它适用于ltr,rtl语言环境:

actionbar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);

这是完全的,来自@VictorYakunin的修正

public class SettingsActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        Toolbar actionbar = (Toolbar) findViewById(R.id.actionbar);
        if (null != actionbar) {
            actionbar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);

            actionbar.setTitle(R.string.title_activity_settings);
            actionbar.setNavigationOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    NavUtils.navigateUpFromSameTask(SettingsActivity.this);
                }
            });

            // Inflate a menu to be displayed in the toolbar
            actionbar.inflateMenu(R.menu.settings);
        }
    }
}

Answer 2

Yout可以?homeAsUpIndicator代替 R.drawable.abc_ic_ab_back_mtrl_am_alpha:

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?colorPrimary"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        app:navigationIcon="?homeAsUpIndicator"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:title="@string/title"
        />

Answer 3

在这里晚会的方式,但我仍然会提供0.02美元.我做到了下面的方式来展现向上箭头标记的fragment使用AppCompactActivity

((MainActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);

并处理活动中的onClick事件 onOptionsItemSelected

Answer 4

如果您提供父活动名称Manifest.xml和元数据以支持Android 4.0及更低版本,那么您只需设置导航图标(toolbar.setNavigationIcon(R.drawable.ic_action_back);)即可.

Manifest.xml示例:

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".ProductActivity"
        android:label="@string/title_activity_product"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity" />
    </activity>