Android中判断网络连接是否可用

一、判断网络连接是否可用

public static boolean isNetworkAvailable(Context context) {           ConnectivityManager cm = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           if (cm == null) {           } else {　　　　　　　//如果仅仅是用来判断网络连接　　　　　　  //则可以使用 cm.getActiveNetworkInfo().isAvailable();              NetworkInfo[] info = cm.getAllNetworkInfo();               if (info != null) {                   for (int i = 0; i < info.length; i++) {                       if (info[i].getState() == NetworkInfo.State.CONNECTED) {                           return true;                       }                   }               }           }           return false;       }

下面的不仅可以判断，如果没有开启网络的话，就进入到网络开启那个界面，具体代码如下：

protected boolean CheckNetwork() {  // TODO Auto-generated method stub     boolean flag=false;     ConnectivityManager cwjManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);     if(cwjManager.getActiveNetworkInfo()!=null)      flag=cwjManager.getActiveNetworkInfo().isAvailable();     if(!flag){      Builder b=new AlertDialog.Builder(this).setTitle("没有可用的网络").setMessage("请开启GPRS或WIFI网路连接");      b.setPositiveButton("确定",new DialogInterface.OnClickListener() {        public void onClick(DialogInterface dialog, int which) {     // TODO Auto-generated method stub     Intent mIntent=new Intent("/");     ComponentName comp=new ComponentName("com.android.settings","com.android.settings.WirelessSettings");     mIntent.setComponent(comp);     mIntent.setAction("android.intent.action.VIEW");     startActivity(mIntent);     }         }).setNegativeButton("取消", new DialogInterface.OnClickListener() {    public void onClick(DialogInterface dialog, int which) {     // TODO Auto-generated method stub     dialog.cancel();        }   }).create();      b.show();    }    return flag; }

用的时候可以这样用：

if(!CheckNetwork())         return;

二、判断GPS是否打开

public static boolean isGpsEnabled(Context context) {           LocationManager lm = ((LocationManager) context                   .getSystemService(Context.LOCATION_SERVICE));           List<String> accessibleProviders = lm.getProviders(true);           return accessibleProviders != null && accessibleProviders.size() > 0;       }

下边这小段代码是用来判断手机的GPS服务是否为开启状态.如果是就提示用户GPS已经打开.

如果现在GPS 处于关闭状态,那么给用户一个提示, 然后打开GPS设置界面,让用户更改GPS为启动状态.

private void openGPSSettings(){LocationManager alm =(LocationManager)this.getSystemService( Context.LOCATION_SERVICE );if( alm.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER ) ){Toast.makeText( this, “GPS is already on”, Toast.LENGTH_SHORT ).show();}else{Toast.makeText( this, “Please turn on GPS”, Toast.LENGTH_SHORT ).show();Intent myIntent = new Intent( Settings.ACTION_SECURITY_SETTINGS );startActivity(myIntent);}}

初始化GPS设置

private void initGPS(){LocationManager locationManager=(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);//判断GPS模块是否开启，如果没有则开启if(!locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)){Toast.makeText(this, "GPS is not open,Please open it!", Toast.LENGTH_SHORT).show();Intent intent=new Intent(Settings.ACTION_SECURITY_SETTINGS);startActivityForResult(intent,0);}else {Toast.makeText(this, "GPS is ready", Toast.LENGTH_SHORT);}}

三、判断WIFI是否打开

public static boolean isWifiEnabled(Context context) {           ConnectivityManager mgrConn = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           TelephonyManager mgrTel = (TelephonyManager) context                   .getSystemService(Context.TELEPHONY_SERVICE);           return ((mgrConn.getActiveNetworkInfo() != null && mgrConn                   .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel                   .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);       }

四、判断是否是3G网络

 public static boolean is3rd(Context context) {           ConnectivityManager cm = (ConnectivityManager) context                   .getSystemService(Context.CONNECTIVITY_SERVICE);           NetworkInfo networkINfo = cm.getActiveNetworkInfo();           if (networkINfo != null                   && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {               return true;           }           return false;       }

五、判断是wifi还是3g网络,用户的体现性在这里了，wifi就可以建议下载或者在线播放。

 public static boolean isWifi(Context context) {               ConnectivityManager cm = (ConnectivityManager) context                       .getSystemService(Context.CONNECTIVITY_SERVICE);               NetworkInfo networkINfo = cm.getActiveNetworkInfo();               if (networkINfo != null                       && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {                   return true;               }               return false;           }

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