Android WebView没有显示任何内容_Android_Webview

Android WebView没有显示任何内容

android webview

Android WebView没有显示任何内容,android,webview,Android,Webview,我正在尝试使用webView在android应用程序中显示URL 如果我尝试使用此URL- 我明白了- 但是如果我试着用这个- 我明白了- 我所做的是- 活动- package com.appnucleus.abrarjahin.hello8920; import android.content.Context; import android.net.ConnectivityManager; import android.support.v7.app.AppCompatActivity

我正在尝试使用webView在android应用程序中显示URL

如果我尝试使用此URL-

我明白了-

但是如果我试着用这个-

我明白了-

我所做的是-

活动-

package com.appnucleus.abrarjahin.hello8920;

import android.content.Context;
import android.net.ConnectivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }
}

<?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"
    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="com.appnucleus.abrarjahin.hello8920.ActivityMain">

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

<resources>
    <string name="app_name" translatable="false">Hello 8920</string>
    <string name="sound_cloud_url">https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F8111706%3Fsecret_token%3Ds-3aK27&amp;color=e2ef3a&amp;auto_play=false&amp;show_artwork=false</string>
    <string name="test_url">http://stackoverflow.com/</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appnucleus.abrarjahin.hello8920">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ActivityMain">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

package com.appnucleus.abrarjahin.hello8920；
导入android.content.Context；
导入android.net.ConnectivityManager；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.webkit.WebView；
导入android.widget.Toast；
公共类活动Main扩展了AppCompatActivity
{
@凌驾
创建时受保护的void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
if（isNetworkAvailable（））//检查internet是否可用
{
Toast.makeText(
活动主，这个，
“互联网连接”，
吐司，长度
).show（）；
WebView WebView=（WebView）findViewById（R.id.WebView）；
webview.getSettings（）.setJavaScriptEnabled（true）；
loadUrl（getString（R.string.sound_cloud_url））；
}
else//未连接
{
Toast.makeText(
活动主，这个，
“互联网断开”，
吐司，长度
).show（）；
}
}
//
//
公共布尔值isNetworkAvailable（）
{
最终连接管理器连接管理器=（（连接管理器）getApplicationContext（）.getSystemService（Context.CONNECTIVITY_SERVICE））；
返回connectivityManager.getActiveNetworkInfo（）！=null&&connectivityManager.getActiveNetworkInfo（）.isConnected（）；
}
}

布局-

package com.appnucleus.abrarjahin.hello8920;

import android.content.Context;
import android.net.ConnectivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }
}

<?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"
    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="com.appnucleus.abrarjahin.hello8920.ActivityMain">

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

<resources>
    <string name="app_name" translatable="false">Hello 8920</string>
    <string name="sound_cloud_url">https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F8111706%3Fsecret_token%3Ds-3aK27&amp;color=e2ef3a&amp;auto_play=false&amp;show_artwork=false</string>
    <string name="test_url">http://stackoverflow.com/</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appnucleus.abrarjahin.hello8920">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ActivityMain">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

strings.xml-

package com.appnucleus.abrarjahin.hello8920;

import android.content.Context;
import android.net.ConnectivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }
}

<?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"
    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="com.appnucleus.abrarjahin.hello8920.ActivityMain">

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

<resources>
    <string name="app_name" translatable="false">Hello 8920</string>
    <string name="sound_cloud_url">https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F8111706%3Fsecret_token%3Ds-3aK27&amp;color=e2ef3a&amp;auto_play=false&amp;show_artwork=false</string>
    <string name="test_url">http://stackoverflow.com/</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appnucleus.abrarjahin.hello8920">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ActivityMain">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>


你好，8920
https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F8111706%3Fsecret_token%3Ds-3aK27&；颜色=e2ef3a&；自动播放=假&；show_artwork=false
http://stackoverflow.com/

AndroidManifest.xml-

package com.appnucleus.abrarjahin.hello8920;

import android.content.Context;
import android.net.ConnectivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }
}

<?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"
    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="com.appnucleus.abrarjahin.hello8920.ActivityMain">

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

<resources>
    <string name="app_name" translatable="false">Hello 8920</string>
    <string name="sound_cloud_url">https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F8111706%3Fsecret_token%3Ds-3aK27&amp;color=e2ef3a&amp;auto_play=false&amp;show_artwork=false</string>
    <string name="test_url">http://stackoverflow.com/</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appnucleus.abrarjahin.hello8920">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ActivityMain">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

有人能帮我解释一下为什么我会得到一张空白页吗？

试试这个

    webView = (WebView) findViewById(R.id.webView);
    **webView.setWebViewClient(new WebViewClient());**
    String url = "https://www.google.co.in";
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl(url);

这可能对你有帮助。

试试这个

    webView = (WebView) findViewById(R.id.webView);
    **webView.setWebViewClient(new WebViewClient());**
    String url = "https://www.google.co.in";
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl(url);

Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
startActivity(browserIntent);

这可能会对您有所帮助。

在WebView上添加

WebViewClient

，并检查您遇到的错误

Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
startActivity(browserIntent);

如何设置

webView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return super.shouldOverrideUrlLoading(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }

            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                super.onReceivedError(view, errorCode, description, failingUrl);
                Log.e("Error", description);
           }

   });

希望这会有意义。

在WebView上添加

WebViewClient

，并检查您收到的错误

如何设置

webView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return super.shouldOverrideUrlLoading(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }

            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                super.onReceivedError(view, errorCode, description, failingUrl);
                Log.e("Error", description);
           }

   });

希望这会有意义。

尝试以下代码：-

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
webView.setWebViewClient(new myWebClient());
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }

 public class myWebClient extends WebViewClient
        {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }

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

公共类活动Main扩展了AppCompative活动
{
@凌驾
创建时受保护的void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
if（isNetworkAvailable（））//检查internet是否可用
{
Toast.makeText(
活动主，这个，
“互联网连接”，
吐司，长度
).show（）；
WebView WebView=（WebView）findViewById（R.id.WebView）；
setWebViewClient（新的myWebClient（））；
webview.getSettings（）.setJavaScriptEnabled（true）；
loadUrl（getString（R.string.sound_cloud_url））；
}
else//未连接
{
Toast.makeText(
活动主，这个，
“互联网断开”，
吐司，长度
).show（）；
}
}
//
//
公共布尔值isNetworkAvailable（）
{
最终连接管理器连接管理器=（（连接管理器）getApplicationContext（）.getSystemService（Context.CONNECTIVITY_SERVICE））；
返回connectivityManager.getActiveNetworkInfo（）！=null&&connectivityManager.getActiveNetworkInfo（）.isConnected（）；
}
公共类myWebClient扩展了WebViewClient
{
@凌驾
public void onPageStarted（WebView视图、字符串url、位图favicon）{
//TODO自动生成的方法存根
super.onPageStarted（视图、url、favicon）；
}
@凌驾
公共布尔值shouldOverrideUrlLoading（WebView视图，字符串url）{
//TODO自动生成的方法存根
view.loadUrl（url）；
返回true；
}
}
}

尝试以下代码：-

public class ActivityMain extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if ( isNetworkAvailable() )     //check if internet available or not
        {
            Toast.makeText(
                                ActivityMain.this,
                                "Internet Connected",
                                Toast.LENGTH_LONG
                            ).show();
            WebView webview = (WebView)findViewById(R.id.webView);
webView.setWebViewClient(new myWebClient());
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadUrl(getString(R.string.sound_cloud_url));
        }
        else    //Not connected
        {
            Toast.makeText(
                    ActivityMain.this,
                    "Internet Disconnected",
                    Toast.LENGTH_LONG
            ).show();
        }
    }

    //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //<uses-permission android:name="android.permission.INTERNET"/>
    public boolean isNetworkAvailable()
    {
        final ConnectivityManager connectivityManager = ((ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE));
        return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
    }

 public class myWebClient extends WebViewClient
        {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }

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

公共类活动Main扩展了AppCompative活动
{
@凌驾
创建时受保护的void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
if（isNetworkAvailable（））//检查internet是否可用
{
Toast.makeText(
活动主，这个，
“互联网连接”，
吐司，长度
).show（）；
WebView WebView=（WebView）findViewById（R.id.WebView）；
setWebViewClient（新的myWebClient（））；
webview.getSettings（）.setJavaScriptEnabled（true）；
loadUrl（getString（R.string.sound_cloud_url））；
}
else//未连接
{
Toast.makeText(
活动主，这个，
“互联网断开”，
吐司，长度
).show（）；
}
}
//
//
公共布尔值isNetworkAvailable（）
{
最终连接管理器连接管理器=（（连接管理器）getApplicationContext（）.getSys