Android 支持库 ActionBar 在 2.3 设备中不起作用

Question

你好 friend ，我用 v7 Appcompact 实现了 ActionBar 支持库。我用 ActionBarActivity 扩展了我的 Activity 类。以下是我的主要类(class)

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.SearchView;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    MenuItem menuItem=menu.findItem(R.id.menu_settings);
    SearchView mSearchView=(SearchView)menuItem.getActionView();
    return super.onCreateOptionsMenu(menu);
       }

    }

在 list 文件中，我声明了这样的主题类型

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.appcompactdemo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.appcompactdemo.MainActivity"
        android:label="@string/app_name" 
        android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

在 style.xml 中如下所示:

<style name="ExampleTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="homeAsUpIndicator">@drawable/new_indicator</item>
    <item name="android:homeAsUpIndicator">@drawable/new_indicator</item>
  </style>

上面的代码在 Android 4.0 版本中运行良好，但在 2.3 设备中它无法运行，它会给出如下错误:

java.lang.NoSuchMethodError: android.view.MenuItem.getActionView
    07-26 04:11:40.900: E/AndroidRuntime(412):  at com.example.appcompactdemo.MainActivity.onCreateOptionsMenu(MainActivity.java:24)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.app.Activity.onCreatePanelMenu(Activity.java:2158)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224) 
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:224)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.support.v7.app.ActionBarActivityDelegateBase$1.run(ActionBarActivityDelegateBase.java:69)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.os.Handler.handleCallback(Handler.java:587)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.os.Looper.loop(Looper.java:130)
07-26 04:11:40.900: E/AndroidRuntime(412):  at android.app.ActivityThread.main(ActivityThread.java:3683)
07-26 04:11:40.900: E/AndroidRuntime(412):  at java.lang.reflect.Method.invokeNative(Native Method)
07-26 04:11:40.900: E/AndroidRuntime(412):  at java.lang.reflect.Method.invoke(Method.java:507)
07-26 04:11:40.900: E/AndroidRuntime(412):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-26 04:11:40.900: E/AndroidRuntime(412):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-26 04:11:40.900: E/AndroidRuntime(412):  at dalvik.system.NativeStart.main(Native Method)

所以知道我该如何解决它吗？

Answer 1

我认为您的问题的答案在 official developers guide :

您应该声明搜索小部件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
    <item android:id="@+id/action_search"
         android:title="@string/action_search"
         android:icon="@drawable/ic_action_search"
         yourapp:showAsAction="ifRoom|collapseActionView"
         yourapp:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

If you need to configure the action view (such as to add event listeners), you can do so during the onCreateOptionsMenu() callback. You can acquire the action view object by calling the static method MenuItemCompat.getActionView() and passing it the corresponding MenuItem. For example, the search widget from the above sample is acquired like this:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main_activity_actions, menu);
    MenuItem searchItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem); // <-- change your code to this
    // Configure the search info and add any event listeners
    ...
    return super.onCreateOptionsMenu(menu);
}