Question

我是 Android 的新手......我使用 Eclipse Juno IDE。

我的目标是将我的应用程序指向打开它的网页。我使用WebView概念。已正确授予所有权限（据我所知）。 Eclipse上的Java代码似乎没有错误。

但是，关于EMULATOR IT SAYS＆＃34; net :: ERR_CACHE_MISS＆＃34;。在移动设备上安装应用程序时，APP SAYS＆＃34;网页不可用＆＃34;

我尝试将网址更改为www.google.co.in，以测试我的代码，尽管我提供了我喜欢的网址。对此也是如此。请帮助我解决这个问题...... 它真的很有帮助...... 提前谢谢......

下面是我从 AndroidManifest.xml 到 MyActivity.java 的完整代码：

的Manifest.xml：

<?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="7"
        android:targetSdkVersion="21" />
    <uses-permission android:name="anroid.permission.INTERNET"/>
    <uses-permission android:name="android.permissions.NETWORK_ACCESS" />
    <uses-permission android:name="android.permissions.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/web_logo"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>
    </application>
</manifest>

activity_main.xml中：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <WebView
        android:id="@+id/webView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
</LinearLayout>

MainActivity.java：

package com.example.webview;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    /** Called when the activity is first created. */

    WebView Browser;

     private class WebClient extends WebViewClient
     {
         @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // TODO Auto-generated method stub
                view.loadUrl(url);
                return true;
         }

     }

     @Override
     protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         Browser=(WebView) findViewById(R.id.webView1);
         Browser.setWebViewClient(new WebClient());
         Browser.loadUrl("www.google.co.in");    
     }

     @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            if(event.getAction() == KeyEvent.ACTION_DOWN){
                switch(keyCode)
                {
                case KeyEvent.KEYCODE_BACK:
                    if(Browser.canGoBack()){
                        Browser.goBack();
                    }
                    else
                    {
                        backButtonHandler();
                    }
                    return true;
                }

            }
            return super.onKeyDown(keyCode, event);
        }
     public void backButtonHandler() {
            AlertDialog.Builder alertDialog = new AlertDialog.Builder(
                    MainActivity.this);

            // Setting Dialog Title
           // Setting Dialog Message

            alertDialog.setTitle("");
            alertDialog.setIcon(R.drawable.dialog_icon);
            alertDialog.setMessage("Exit Now?");

             // Setting Icon to Dialog
            // Setting Positive "Yes" Button

            alertDialog.setPositiveButton("Exit",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            finish();
                        }
            });

        // Setting Negative "NO" Button

            alertDialog.setNegativeButton("No",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // Write your code here to invoke NO event
                            dialog.cancel();
                        }
                    });
        // Showing Alert Message
            alertDialog.show();
     }

}

Answer 1

尝试完整地址，例如：

Browser.loadUrl("http://www.google.co.in");

我只知道“www”不起作用。

Answer 2

最后，在我的 MainActivity.java 中进行一些细微更改后，它才有效。以下是经过编辑的代码：

package com.example.webview;


import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.Button;
import android.widget.EditText;


public class MainActivity extends Activity {

    /** Called when the activity is first created. */

    WebView Browser;

    private class WebClient extends WebViewClient
    {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) 
        {

            // TODO Auto-generated method stub

            view.loadUrl(url);
            return true;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Browser=(WebView) findViewById(R.id.webView1);
        Browser.getSettings().setJavaScriptEnabled(true);
            // Give your desired URL below
        Browser.loadUrl("http://www.xxxxxxxxxxxxxx.com");
        Browser.setWebViewClient(new WebClient());
        Browser.setWebChromeClient(new WebChromeClient()});
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(event.getAction()==KeyEvent.ACTION_DOWN)
        {
            switch(keyCode)
            {
            case KeyEvent.KEYCODE_BACK:
                if(Browser.canGoBack())
                {
                    Browser.goBack();
                }
                else
                {
                    backButtonHandler();
                }
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }

    public void backButtonHandler() {
        AlertDialog.Builder alertDialog=new AlertDialog.Builder(MainActivity.this);

        // Setting Dialog Title 
        // Setting Dialog Message

        alertDialog.setTitle("");
        alertDialog.setIcon(R.drawable.dialog_icon1);
        alertDialog.setMessage("Exit Now?");

        // Setting Icon to Dialog 
         // Setting Positive "Yes" Button

        alertDialog.setPositiveButton("Exit", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) { finish();
    }
  });

        // Setting Negative "NO" Button

        alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {

                // Write your code here to invoke NO event

                dialog.cancel();
            }
  });

        // Showing Alert Message

        alertDialog.show();
    }
}

ANDROID URL DIRECT APP SAYS＆＃34;网页不可用＆＃34;，ON EMULATOR IT SAYS＆＃34; net :: ERR_CACHE_MISS＆＃34;

2 个答案: