Question

Android的新手，如果有任何错误，请原谅

用FiveFragment.java发行，其中 mWebview 变量用红色下划线标出，“无法解析符号mWebview”

frament_five.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.ekatechhp.pkmapplication.FiveFragment">
<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
   </RelativeLayout>

FragmentFive.java：

@SuppressLint("ValidFragment")
public class FiveFragment extends Fragment {
public FiveFragment() {
    // Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout. fragment_five, container, false);
    mWebview = (WebView) view.findViewById(R.id.webview);
    mWebview.loadUrl("https://google.com");

    // Enable Javascript
    WebSettings webSettings = mWebview.getSettings();
    webSettings.setJavaScriptEnabled(true);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient());

    return view;
}
}

Answer 1

在这样的WebView mWebview之类的程序中

声明 WebView ；

@SuppressLint("ValidFragment")
public class FiveFragment extends Fragment {

WebView mWebview ;//declare here

public FiveFragment() {
    // Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle 
savedInstanceState) {
View view=inflater.inflate(R.layout. fragment_five, container, false);
mWebview = (WebView) view.findViewById(R.id.webview);
mWebview.loadUrl("https://google.com");

// Enable Javascript
WebSettings webSettings = mWebview.getSettings();
webSettings.setJavaScriptEnabled(true);

// Force links and redirects to open in the WebView instead of in a browser
mWebView.setWebViewClient(new WebViewClient());

return view;
  }
 }

并确保您导入此

import android.webkit.WebView;

Answer 2

这是因为您没有在片段中声明mWebview。

添加WebView mWebview;进行声明。

最终代码是-

@SuppressLint("ValidFragment")
public class FiveFragment extends Fragment {

WebView mWebview;

public FiveFragment() {
    // Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout. fragment_five, container, false);
    mWebview = (WebView) view.findViewById(R.id.webview);
    mWebview.loadUrl("https://google.com");

    // Enable Javascript
    WebSettings webSettings = mWebview.getSettings();
    webSettings.setJavaScriptEnabled(true);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient());

    return view;
}
}

Webview场景中的片段问题

2 个答案: