android检测网络连接状态示例讲解

<uses-permission android:name="android.permission.access_network_state"/>
<uses-permission android:name="android.permission.internet"/>

/**
 * 对网络连接状态进行判断
 * @return  true, 可用； false， 不可用
 */ 
private boolean isopennetwork() { 
    connectivitymanager connmanager = (connectivitymanager)getsystemservice(context.connectivity_service); 
    if(connmanager.getactivenetworkinfo() != null) { 
        return connmanager.getactivenetworkinfo().isavailable(); 
    } 

    return false; 
} 

/**
 * 访问百度主页，网络不可用则需设置
 */ 
private void initmoregames() { 
    string url_moregames = "http://www.baidu.com"; 
    mwebview = (webview) findviewbyid(r.id.view_gamesort); 

    if (mwebview != null) { 
        mwebview.requestfocus(); 
        websettings websettings = mwebview.getsettings(); 
        if (websettings != null) { 
            websettings.setjavascriptenabled(true); 
            websettings.setcachemode(mode_private); 
            websettings.setdefaulttextencodingname("utf-8"); 
        } 

        // 判断网络是否可用 
        if(isopennetwork() == true) { 
            mwebview.loadurl(url_moregames); 
        } else { 
            alertdialog.builder builder = new alertdialog.builder(moregamesactivity.this); 
            builder.settitle("没有可用的网络").setmessage("是否对网络进行设置?"); 

            builder.setpositivebutton("是", new dialoginterface.onclicklistener() { 
                @override 
                public void onclick(dialoginterface dialog, int which) { 
                    intent intent = null; 

                    try { 
                        string sdkversion = android.os.build.version.sdk; 
                        if(integer.valueof(sdkversion) > 10) { 
                            intent = new intent(android.provider.settings.action_wireless_settings); 
                        }else { 
                            intent = new intent(); 
                            componentname comp = new componentname("com.android.settings", "com.android.settings.wirelesssettings"); 
                            intent.setcomponent(comp); 
                            intent.setaction("android.intent.action.view"); 
                        } 
                        moregamesactivity.this.startactivity(intent); 
                    } catch (exception e) { 
                        log.w(tag, "open network settings failed, please check..."); 
                        e.printstacktrace(); 
                    } 
                } 
            }).setnegativebutton("否", new dialoginterface.onclicklistener() { 
                @override 
                public void onclick(dialoginterface dialog, int which) { 
                    dialog.cancel();         
                    finish(); 
                } 
            }).show(); 
        } 
    } else { 
        log.w(tag, "mwebview is null, please check..."); 
    } 
}