ANDROID URL DIRECT 应用程序说“网页不可用"，在模拟器上说“net::ERR_CACHE_MISS" [英] ANDROID URL DIRECT APP SAYS "web page not available", ON EMULATOR IT SAYS "net::ERR_CACHE_MISS"

问题描述

我是 Android 新手...我使用 Eclipse Juno IDE.

I'm new to Android... I use Eclipse Juno IDE.

我的目标是在打开我的应用程序时将它定向到一个网页.我使用 WebView 概念.已正确授予所有权限(据我所知).Java 代码在 Eclipse 上似乎没有错误.

My aim is to just direct my app to a web page on opening it. I use WebView concept. Have given all permissions correctly(upto my knowledge). Java Code seems error free on eclipse.

但是，在模拟器上它说net::ERR_CACHE_MISS".在手机上安装该应用程序时，该应用程序说网页不可用"

But, ON EMULATOR IT SAYS "net::ERR_CACHE_MISS". When installed the app on mobile, the APP SAYS "web page not available"

我尝试通过将 url 更改为 www.google.co.in 来测试我的代码，尽管提供了我的首选 url.为此，它也讲述了相同的内容.请帮我解决这些问题...真的会很有帮助...提前致谢...

I tried by changing the url as www.google.co.in, to test my code, despite giving my preferred url. For that also it tells the same. Kindly help me sort this problems out... It'd really be helpful... Thanks in advance...

下面给出的是我从 AndroidManifest.xml 到 MyActivity.java 的完整代码:

Below given is my complete code from AndroidManifest.xml to MyActivity.java:

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:

<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();
     }

}

推荐答案

在我的 MainActivity.java 中进行了一些小的更改后，它终于可以工作了.修改后的代码如下:

Finally it works after some minor changes in my MainActivity.java. Below is the edited code:

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();
    }
}

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