java - 我不断收到这个 java.lang.illegalStateException

Question

我使用 onClick:Showpoup 在 xml 中创建了一个按钮，我让它运行，但我不断收到此错误，请帮我解决此代码。

谢谢大家对坦桑尼亚的热爱。

package com.labawsrh.aws.introscreen;

import android.app.Dialog;

import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class AccountFragment extends Fragment {

    Dialog myDialog;



    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
       View v = inflater.inflate (R.layout.fragment_account,container,false);



       myDialog = new Dialog(getActivity ());
        return  v;


    }

    public  void ShowPopup(View v)
    {

        TextView txtclose = (TextView)v.findViewById (R.id.txtclose);
        myDialog.setContentView (R.layout.custompop);
        txtclose.setOnClickListener (new View.OnClickListener () {
            @Override
            public void onClick(View v) {
                myDialog.dismiss ();
            }
        });
         myDialog.getWindow ().setBackgroundDrawable (new ColorDrawable 
 (Color.TRANSPARENT));
        myDialog.show ();

    }

}

XML 代码:

<Button
       android:onClick="ShowPopup"
       android:textAllCaps="false"
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/university"
        android:layout_marginTop="190dp"
        android:layout_marginLeft="90dp"/>

这一直显示在我的 logcat 中

2019-07-23 21:08:45.776 6437-6437/com.labawsrh.aws.introscreen E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.labawsrh.aws.introscreen, PID: 6437
    java.lang.IllegalStateException: Could not find method ShowPopup(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:424)
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:381)
        at android.view.View.performClick(View.java:5610)
        at android.view.View$PerformClick.run(View.java:22265)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6077)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

Answer 1

I created a button in xml using onClick:Showpoup I excepted it to run but I keep getting this error

这是因为在 Fragment 上使用 onClick xml 属性时出现了一个怪癖(我可以说这是一个错误吗？)。您不能将 onClick 属性与 Fragment 一起使用，它仅适用于 Activity。因此，您需要使用 View.setOnClickListener() 来代替。