Android中判斷網路連接是否可用

一、判斷網路連接是否可用

public static boolean isNetworkAvailable(Context context) {ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);if (cm == null) {} else {// 如果僅僅是用來判斷網路連接　　　　　　// 則可以使用 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;}

 

下面的不僅可以判斷，如果沒有開啟網路的話，就進入到網路開啟那個介面，具體代碼如下：

protected boolean CheckNetwork() {// TODO Auto-generated method stubboolean 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("沒有可用的網路").setMessage("請開啟GPRS或WIFI網路串連");b.setPositiveButton("確定", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubIntent 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;}

用的時候可以這樣用：
if(!CheckNetwork()) return;
 

 

二、判斷GPS是否開啟

  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;       } 

三、判斷WIFI是否開啟

 

 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、判斷是否是3G網路

 

    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、判斷是wifi還是3g網路,使用者的體現性在這裡了，wifi就可以建議下載或者線上播放。

  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;           }