创建简单的WebView Android时出现问题

Question

OK - so I typically develop for iOS but have a client who needs a hand in a pinch.

I followed a tutorial, which was very straightforward and helpful. I created everything as it had asked me to (or maybe I didn't - which is why I'm here).

Any help would be greatly appreciated. We are really in a bind here!

You're welcome to come in over join.me as well and take a look. I think it could be something incredibly simple that I am too ignorant/inexperienced with this platform to see.

http://www.tutorialspoint.com/android/android_webview_layout.htm

The issue could be very simple. On these lines, I am getting errors which Eclipse will not override:

  setContentView(R.layout.activity_main);
  field = (EditText)findViewById(R.id.urlField);
  browser = (WebView)findViewById(R.id.webView1);

Error is "R cannot be resolved to a variable

Here is my MainActivity.java

package com.example.WebView;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

   private EditText field;
   private WebView browser;

   @Override        
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      field = (EditText)findViewById(R.id.urlField);
      browser = (WebView)findViewById(R.id.webView1);
      browser.setWebViewClient(new MyBrowser());
   }


   public void open(View view){
      String url = field.getText().toString();
      browser.getSettings().setLoadsImagesAutomatically(true);
      browser.getSettings().setJavaScriptEnabled(true);
      browser.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
      browser.loadUrl("http://www.magiktab.com/app");

   }
   private class MyBrowser extends WebViewClient {
      @Override
      public boolean shouldOverrideUrlLoading(WebView view, String url) {
         view.loadUrl("http://www.magiktab.com/app");
         return true;
      }
   }


   }

Here is my activity_main.xml

<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"
   android:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   tools:context=".MainActivity" >

   <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/hello_world" />

   <EditText
      android:id="@+id/urlField"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignTop="@+id/textView1"
      android:layout_centerHorizontal="true"
      android:ems="10" />

   <Button
      android:id="@+id/button1" 
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/urlField"
      android:layout_centerHorizontal="true"
      android:onClick="open"
      android:text="@string/browse" />

   <WebView
      android:id="@+id/webView1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/textView1"
      android:layout_alignParentBottom="true"
      android:layout_below="@+id/button1" />


</RelativeLayout>

And of course, my manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.webview"
   android:versionCode="1"
   android:versionName="1.0" >

   <uses-sdk
  android:minSdkVersion="8"
  android:targetSdkVersion="17" />
   <uses-permission android:name="android.permission.INTERNET"/>

   <application
      android:allowBackup="true"
       android:icon="@drawable/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" >
      <activity
     android:name="com.example.webview.MainActivity"
     android:label="@string/app_name" >
     <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
  </activity>

Answer 1

This may happen when your application package name is different from the activity package name;

import com.your.app.package.name.R;

usually helps.