android - 标题栏上的后退按钮不适用于 Lollipop 之前的设备

Question

我在我的应用程序中的一些 Activity 的标题栏上添加了一个后退按钮。后退按钮适用于 Lollipop 设备，但当我在 Icecream Sandwich 设备上测试我的应用程序时，后退按钮不起作用。这是我的代码:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_article);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);   //Adding back button
    List<ItemObjectArticle> rowListItem = getAllArticleItemList();
    lLayout = new LinearLayoutManager(ArticleActivity.this);
    RecyclerView rView = (RecyclerView)findViewById(R.id.recycler_view1);
    rView.setLayoutManager(lLayout);
    ArticleAdapter rcAdapter = new ArticleAdapter(ArticleActivity.this, rowListItem);
    rView.setAdapter(rcAdapter);
}

public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
//noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }else if(id==R.id.home){
        NavUtils.navigateUpFromSameTask(this);  //handling click
        return true;
    }

    return super.onOptionsItemSelected(item);
}

在 Android Manifest 文件中，我添加了:

<activity
        android:name=".ArticleView"
        android:label="@string/title_activity_article_view"
        android:parentActivityName="com.example.android.kheti.ArticleActivity">   //this
    <intent-filter>
        <action android:name="com.example.android.kheti.ARTICLEVIEW" />

        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
    </activity>

我需要更改什么代码才能使其适用于所有 Android 设备？

Answer 1

来自文档

Beginning in Android 4.1 (API level 16), you can declare the logical parent of each activity by specifying the android:parentActivityName attribute in the element.

If your app supports Android 4.0 and lower, include the Support Library with your app and add a element inside the . Then specify the parent activity as the value for android.support.PARENT_ACTIVITY, matching the android:parentActivityName attribute.

因此您需要添加元数据以使其适用于所有设备。添加支持库并尝试这样做:

<activity
        android:name=".ArticleView"
        android:label="@string/title_activity_article_view"
        android:parentActivityName="com.example.android.kheti.ArticleActivity" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.android.kheti.ArticleActivity" />
 </activity>