找不到类'；android.app.Notification$Builder

我已经在我的项目库中添加了andriod-support-v4.jar。。。但我得到了这个错误：

Could not find class 'android.app.Notification$Builder', referenced from method org.secure.sms.SmsReceiver.showNotification
 Could not find class 'android.support.v4.app.NotificationCompat$Builder', referenced from method org.secure.sms.SmsReceiver.createNotification
 FATAL EXCEPTION: main
 java.lang.NoClassDefFoundError: android.support.v4.app.NotificationCompat$Builder
    at org.secure.sms.SmsReceiver.createNotification(SmsReceiver.java:108)
    at org.secure.sms.SmsReceiver.onReceive(SmsReceiver.java:136)
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:1794)
    at android.app.ActivityThread.access$2400(ActivityThread.java:117)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:981)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:3683)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
    at dalvik.system.NativeStart.main(Native Method)

问题出在哪里

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屏幕截图：

确保文件夹中有

android-support-v4.jar

/libs

并将其添加到您的类中：

import android.support.v4.app.NotificationCompat;

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你添加了这个导入吗？导入android.support.v4.app.NotificationCompat；不，只有android SDK内extra forlder中的android-support-v4.jar。这个进口在哪里？要添加它吗？在活动的顶部，在其他导入语句中，手动添加该导入（正如我用粗体写的那样）A！很抱歉我有。是的……这个呢？导入android.app.NotificationManager；