我如何解决无法解决方法的findViewById（int）错误 [英] How do I resolve the the cannot resolve method findViewById(int) error

问题描述

我有一个包含以下属性的布局文件;

I have a layout file with the following attributes;

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content">
    <ImageView

        android:layout_width="match_parent"

        android:layout_height="64dp"

        android:scaleType="center"

        android:background="#FFFFBB33"

        android:contentDescription="@string/app_name" />
    <EditText

        android:id="@+id/cityDialog"

        android:inputType="textCapWords"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="16dp"

        android:layout_marginLeft="4dp"

        android:layout_marginRight="4dp"

        android:layout_marginBottom="4dp"

        android:hint="@string/city_hint" />
    <EditText

        android:id="@+id/stateDialog"

        android:inputType="textCapWords"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="4dp"

        android:layout_marginLeft="4dp"

        android:layout_marginRight="4dp"

        android:layout_marginBottom="16dp"

        android:fontFamily="sans-serif"

        android:hint="@string/state_hint"/>

    <EditText

        android:id="@+id/countryDialog"

        android:inputType="textCapWords"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="4dp"

        android:layout_marginLeft="4dp"

        android:layout_marginRight="4dp"

        android:layout_marginBottom="16dp"

        android:fontFamily="sans-serif"

        android:hint="@string/country_hint"/>
</LinearLayout>

然后我有一个相应的类，声明如下：

Then I have a corresponding class with the following declarations;

import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.R.*;

public class settings extends DialogFragment{

public static final String IMAGE_RESOURCE_ID = "iconResourceID";
public static final String ITEM_NAME = "itemName";

private EditText city = (EditText) findViewById(R.id.cityDialog);
private EditText state;
private EditText country;


public settings(){}

public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
return inflater.inflate(R.layout.fragment_setings, container, false);
}
}

但是我得到了一个

But I'm getting a

Cannot resolve method 'findViewById(int)'

和我不知道为什么。





我试过的东西;

- 删除R文件这样就可以生成资源

- 清理和重建整个项目

- 重命名属性



但似乎没有任何效果。我错过了什么？

and I'm not sure why.


Things I've tried;
- Removing the R file so that the resource can be generated
- Cleaning and rebuilding the entire project
- Renaming the attributes

But nothing seems to be working. What am I missing?

推荐答案

你需要先调用 getView（）函数来获取视图片段，然后你可以调用 findViewById（）。



喜欢这个，

You need to first call the getView() function to get the view of the fragment and then you can call the findViewById().

Like this,

private EditText city = (EditText) getView().findViewById(R.id.cityDialog);

现在它应该可以工作。或者您可以使用 getActivity（）作为片段，因为您无法在片段或DialogFragment中直接调用 findViewById（）等等。此外，您应该在 onActivityCreated（）事件中检查并执行这些功能。

Now it should work. Or you can use the getActivity() for the fragment because you cannot directly call findViewById() in a Fragment or DialogFragment and so on. Also, you should check and execute these functions in onActivityCreated() event.

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