带有非默认语言环境的ActionBar NullPointerException的Android应用程序

Question

我用ActionBar和2个标签创建了非常基本的Android应用程序.它运作正常.然后我添加了locale资源目录,res/values-de并在里面添加了strings.xml用德语翻译的字符串.我将Nexus7上的语言更改为德语,部署后无法启动应用程序.我在模拟器上遇到了同样的问题.

请问我可以帮助我在移动设备上使用一些非默认语言环境运行此应用程序吗？在我的情况下德国......

报告以下错误.

02-07 15:32:41.314: W/dalvikvm(16682): threadid=1: thread exiting with uncaught exception (group=0x40d82930)
02-07 15:32:41.324: E/AndroidRuntime(16682): FATAL EXCEPTION: main
02-07 15:32:41.324: E/AndroidRuntime(16682): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tabactionbar/com.example.tabactionbar.MainActivity}: java.lang.NullPointerException
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.os.Looper.loop(Looper.java:137)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread.main(ActivityThread.java:5039)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at java.lang.reflect.Method.invokeNative(Native Method)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at java.lang.reflect.Method.invoke(Method.java:511)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at dalvik.system.NativeStart.main(Native Method)
02-07 15:32:41.324: E/AndroidRuntime(16682): **Caused by: java.lang.NullPointerException
02-07 15:32:41.324: E/AndroidRuntime(16682):    at com.example.tabactionbar.MainActivity.onCreate(MainActivity.java:20)**
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.Activity.performCreate(Activity.java:5104)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-07 15:32:41.324: E/AndroidRuntime(16682):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
02-07 15:32:41.324: E/AndroidRuntime(16682):    ... 11 more
02-07 15:32:41.334: W/ActivityManager(492):   Force finishing activity com.example.tabactionbar/.MainActivity
02-07 15:32:41.434: D/dalvikvm(492): GC_FOR_ALLOC freed 546K, 19% free 15994K/19568K, paused 64ms, total 64ms
02-07 15:32:41.574: D/libgps(492): proxy_gps_nmea_cb()

没有TabListener的MainActivity代码:

public class MainActivity extends Activity {

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

    ActionBar actionBar = getActionBar();

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    String label1 = getResources().getString(R.string.label1);
    Tab tab = actionBar.newTab();
    tab.setText(label1);
    TabListener<Tab1Fragment> tl = new TabListener<Tab1Fragment>(this,
            label1, Tab1Fragment.class);
    tab.setTabListener(tl);
    actionBar.addTab(tab);

    String label2 = getResources().getString(R.string.label2);
    tab = actionBar.newTab();
    tab.setText(label2);
    TabListener<Tab2Fragment> tl2 = new TabListener<Tab2Fragment>(this,
            label2, Tab2Fragment.class);
    tab.setTabListener(tl2);
    actionBar.addTab(tab);          
} 

报告的第20行出错是 actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

带有德语文本的strings.xml是

<string name="app_name">TabActionBar</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="label1">Eins</string>
<string name="label2">Zwei</string>
<string name="body1">Erste</string>
<string name="body2">Zweite</string>

请问我可以帮助我在移动设备上使用一些非默认语言环境运行此应用程序吗？在我的情况下德国......

Answer 1

看看这个讨论: 操作栏 - 菜单按钮 - 缺少

在任何可能的情况下,你还在values-de文件夹中有styles.xml文件吗？这可能会导致ActionBar变为NULL的问题.