java - 无法将 fragment 类添加到我的 Android 项目

Question

我正在android studio上做一个项目。问题是我无法将 fragment 类添加到我的项目中。当我开始做这个项目时，我能够添加两个 fragment 类。但是，在完成大约一半的项目后，现在我无法添加第三个 fragment 类。当我添加第三个 fragment 类并运行我的项目时，会弹出此异常:

java.lang.NoSuchMethodError: No static method zzb(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object; in class Lcom/google/android/gms/common/internal/zzaa; or its super classes (declaration of 'com.google.android.gms.common.internal.zzaa' appears in /data/data/com.hashcoder.eegoomain/files/instant-run/dex/slice-com.google.android.gms-play-services-basement-10.0.1_d1c25087bea669c827e484b09b1949315ba5fc5f-classes.dex)
     at com.google.firebase.provider.FirebaseInitProvider.zza(Unknown Source)
     at com.google.firebase.provider.FirebaseInitProvider.attachInfo(Unknown Source)
     at android.app.ActivityThread.installProvider(ActivityThread.java:5172)
     at android.app.ActivityThread.installContentProviders(ActivityThread.java:4767)
     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4707)
     at android.app.ActivityThread.access$1600(ActivityThread.java:153)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:148)
     at android.app.ActivityThread.main(ActivityThread.java:5441)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)

我尝试了 android.app.Fragment 或 android.support.v4.app.Fragment。两者都不起作用......

Answer 1

试试这个。创建一个 java 类并从 Fragment 扩展它。 这是 fragment 类的基本结构。

public class MyFragment extends Fragment{

@Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.<your xml layout>, container, false);

        //Do your work here
        return view;
    }
}

并确保从 android.support.v4.app.Fragment 扩展它