Question

我已经在Google上搜索错误大约2个小时了，我不知道出了什么问题。当我点击“ butonCap”按钮时，它会强制关闭，直到现在我还没有处理片段

错误：

df = pd.read_csv(file, parse_dates=['Latest date']) 
#e.g. third column, pandas counts from 0
#df = pd.read_csv(file, parse_dates=[2])

Butoane.java-我刚刚制作了另一个Java文件，因为我无法在Java片段文件中编写任何代码

java.lang.IllegalStateException: Could not find method butonCap(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'cap'
                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:423)
                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:380)
                  at android.view.View.performClick(View.java:6897)
                  at android.widget.TextView.performClick(TextView.java:12693)
                  at android.view.View$PerformClick.run(View.java:26101)
                  at android.os.Handler.handleCallback(Handler.java:789)
                  at android.os.Handler.dispatchMessage(Handler.java:98)
                  at android.os.Looper.loop(Looper.java:164)
                  at android.app.ActivityThread.main(ActivityThread.java:6944)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

fragment_fata.xml-这只是导航视图中的2个片段之一

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
            setContentView(R.layout.fragment_fata);

     final Button butonCap = (Button) findViewById(R.id.cap);
    butonCap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent butonCap = new Intent(Butoanele.this, capul.class);
            Butoanele.this.startActivity(butonCap);
        }
    });
}
}

Answer 1

您的课程应该扩展Fragment并在onCreateView（）回调中增加布局。在onViewCreated（）回调中调用getActivity（）。findViewById。

watch this guide

Answer 2

片段中：

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {

            //Inflate the layout for this fragment
            return inflater.inflate(R.layout.fragment_fata, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

            if (getView() == null) {
                    return;
            }

            final Button butonCap = (Button) getView().findViewById(R.id.cap);
            butonCap.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                            Intent intent = new Intent(getView().getContext(), capul.class);
                            startActivity(intent);
                    }
            });
    }

在父级或祖先中找不到方法butonCap（View）

2 个答案: