Question

我创建了一个全新的Android项目，其中包含“Hello World”TextView的空白活动。当我隐藏ActionBar然后在AVD上运行时，应用程序停止。错误看起来像这样：“不幸的是，已经停止了”

我已经尝试过这种隐藏动作栏的方法，但对我没有任何作用：

1）<activity android:theme="@android:style/Theme.NoTitleBar.Fullscreen"....>

2）在onCreate()方法getActionBar（）。hide（）;

以下是logcat中的红色字符串：

02-13 18:42:43.373    2123-2123/? E/Trace﹕ error opening trace file: No such file or directory (2)
02-13 18:42:43.383      794-948/? E/SurfaceFlinger﹕ ro.sf.lcd_density must be defined as a build property

02-13 18:42:43.523    2123-2123/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{styleru.it_lab.reaschedule/styleru.it_lab.reaschedule.loginActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5041)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:309)
            at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:278)
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:252)
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
            at styleru.it_lab.reaschedule.loginActivity.onCreate(loginActivity.java:13)
            at android.app.Activity.performCreate(Activity.java:5104)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5041)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)

02-13 18:42:43.733      794-947/? E/SurfaceFlinger﹕ ro.sf.lcd_density must be defined as a build property

Answer 1

你可以在setcontentview

之前使用requestWindowFeature

        requestWindowFeature(Window.FEATURE_NO_TITLE);

Answer 2

通过更改

解决了这个问题

public class MainActivity extends ActionBarActivity

到此：

public class MainActivity extends Activity

隐藏ActionBar时应用程序停止

2 个答案: