这是我的代码：
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
- //android.support.v7.app.ActionBar actionBar = getSupportActionBar();
- //actionBar.setTitle("Android");
- ActionBar actionBar = getActionBar();
- actionBar.setTitle("Droid");
- }
在使用getSupportActionBar()时,我的应用程序与kitkat和其他新版本运行良好,但使用getActionBar导致错误.
这是错误：
- Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.hide()' on a null object reference
- at com.github.domain.geoquiz.QuizActivity.onCreate(QuizActivity.java:57)
- at android.app.Activity.performCreate(Activity.java:5933)
- at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
- at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
- at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
- at android.app.ActivityThread.access$800(ActivityThread.java:144)
- at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
- at android.os.Handler.dispatchMessage(Handler.java:102)
- at android.os.Looper.loop(Looper.java:135)
- at android.app.ActivityThread.main(ActivityThread.java:5221)
- at java.lang.reflect.Method.invoke(Native Method)
- at java.lang.reflect.Method.invoke(Method.java:372
为什么？来自android文档：
Caution: Be certain you import the ActionBar class (and related APIs)
from the appropriate package:If supporting API levels lower than 11:
import android.support.v7.app.ActionBarIf supporting only API level
11 and higher: import android.app.ActionBar
现在为什么这个应用程序崩溃了？
